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Merge remote-tracking branch 'nixos/master'

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Max Headroom 2023-01-25 19:53:31 +01:00
commit 4aaaa3cdfd
62 changed files with 2836 additions and 967 deletions
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28
.github/PULL_REQUEST_TEMPLATE.md vendored Normal file
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@ -0,0 +1,28 @@
# Motivation
<!-- Briefly explain what the change is about and why it is desirable. -->
# Context
<!-- Provide context. Reference open issues if available. -->
<!-- Non-trivial change: Briefly outline the implementation strategy. -->
<!-- Invasive change: Discuss alternative designs or approaches you considered. -->
<!-- Large change: Provide instructions to reviewers how to read the diff. -->
# Checklist for maintainers
<!-- Contributors: please leave this as is -->
Maintainers: tick if completed or explain if not relevant
- [ ] agreed on idea
- [ ] agreed on implementation strategy
- [ ] tests, as appropriate
- functional tests - `tests/**.sh`
- unit tests - `src/*/tests`
- integration tests
- [ ] documentation in the manual
- [ ] code and comments are self-explanatory
- [ ] commit message explains why the change was made
- [ ] new feature or bug fix: updated release notes

2
.github/workflows/backport.yml vendored
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@ -21,7 +21,7 @@ jobs:
fetch-depth: 0 fetch-depth: 0
- name: Create backport PRs - name: Create backport PRs
# should be kept in sync with `version` # should be kept in sync with `version`
uses: zeebe-io/backport-action@v1.0.1 uses: zeebe-io/backport-action@v1.1.0
with: with:
# Config README: https://github.com/zeebe-io/backport-action#backport-action # Config README: https://github.com/zeebe-io/backport-action#backport-action
github_token: ${{ secrets.GITHUB_TOKEN }} github_token: ${{ secrets.GITHUB_TOKEN }}

77
boehmgc-coroutine-sp-fallback.diff Normal file
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@ -0,0 +1,77 @@
diff --git a/darwin_stop_world.c b/darwin_stop_world.c
index 3dbaa3fb..36a1d1f7 100644
--- a/darwin_stop_world.c
+++ b/darwin_stop_world.c
@@ -352,6 +352,7 @@ GC_INNER void GC_push_all_stacks(void)
int nthreads = 0;
word total_size = 0;
mach_msg_type_number_t listcount = (mach_msg_type_number_t)THREAD_TABLE_SZ;
+ size_t stack_limit;
if (!EXPECT(GC_thr_initialized, TRUE))
GC_thr_init();
@@ -407,6 +408,19 @@ GC_INNER void GC_push_all_stacks(void)
GC_push_all_stack_sections(lo, hi, p->traced_stack_sect);
}
if (altstack_lo) {
+ // When a thread goes into a coroutine, we lose its original sp until
+ // control flow returns to the thread.
+ // While in the coroutine, the sp points outside the thread stack,
+ // so we can detect this and push the entire thread stack instead,
+ // as an approximation.
+ // We assume that the coroutine has similarly added its entire stack.
+ // This could be made accurate by cooperating with the application
+ // via new functions and/or callbacks.
+ stack_limit = pthread_get_stacksize_np(p->id);
+ if (altstack_lo >= altstack_hi || altstack_lo < altstack_hi - stack_limit) { // sp outside stack
+ altstack_lo = altstack_hi - stack_limit;
+ }
+
total_size += altstack_hi - altstack_lo;
GC_push_all_stack(altstack_lo, altstack_hi);
}
diff --git a/pthread_stop_world.c b/pthread_stop_world.c
index b5d71e62..aed7b0bf 100644
--- a/pthread_stop_world.c
+++ b/pthread_stop_world.c
@@ -768,6 +768,8 @@ STATIC void GC_restart_handler(int sig)
/* world is stopped. Should not fail if it isn't. */
GC_INNER void GC_push_all_stacks(void)
{
+ size_t stack_limit;
+ pthread_attr_t pattr;
GC_bool found_me = FALSE;
size_t nthreads = 0;
int i;
@@ -851,6 +853,31 @@ GC_INNER void GC_push_all_stacks(void)
hi = p->altstack + p->altstack_size;
/* FIXME: Need to scan the normal stack too, but how ? */
/* FIXME: Assume stack grows down */
+ } else {
+ if (pthread_getattr_np(p->id, &pattr)) {
+ ABORT("GC_push_all_stacks: pthread_getattr_np failed!");
+ }
+ if (pthread_attr_getstacksize(&pattr, &stack_limit)) {
+ ABORT("GC_push_all_stacks: pthread_attr_getstacksize failed!");
+ }
+ if (pthread_attr_destroy(&pattr)) {
+ ABORT("GC_push_all_stacks: pthread_attr_destroy failed!");
+ }
+ // When a thread goes into a coroutine, we lose its original sp until
+ // control flow returns to the thread.
+ // While in the coroutine, the sp points outside the thread stack,
+ // so we can detect this and push the entire thread stack instead,
+ // as an approximation.
+ // We assume that the coroutine has similarly added its entire stack.
+ // This could be made accurate by cooperating with the application
+ // via new functions and/or callbacks.
+ #ifndef STACK_GROWS_UP
+ if (lo >= hi || lo < hi - stack_limit) { // sp outside stack
+ lo = hi - stack_limit;
+ }
+ #else
+ #error "STACK_GROWS_UP not supported in boost_coroutine2 (as of june 2021), so we don't support it in Nix."
+ #endif
}
GC_push_all_stack_sections(lo, hi, traced_stack_sect);
# ifdef STACK_GROWS_UP

6
configure.ac
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@ -274,6 +274,12 @@ fi
PKG_CHECK_MODULES([GTEST], [gtest_main]) PKG_CHECK_MODULES([GTEST], [gtest_main])
# Look for rapidcheck.
# No pkg-config yet, https://github.com/emil-e/rapidcheck/issues/302
AC_CHECK_HEADERS([rapidcheck/gtest.h], [], [], [#include <gtest/gtest.h>])
AC_CHECK_LIB([rapidcheck], [])
# Look for nlohmann/json. # Look for nlohmann/json.
PKG_CHECK_MODULES([NLOHMANN_JSON], [nlohmann_json >= 3.9]) PKG_CHECK_MODULES([NLOHMANN_JSON], [nlohmann_json >= 3.9])

23
doc/manual/src/command-ref/nix-store.md
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@ -66,11 +66,11 @@ The operation `--realise` essentially “builds” the specified store
paths. Realisation is a somewhat overloaded term: paths. Realisation is a somewhat overloaded term:
- If the store path is a *derivation*, realisation ensures that the - If the store path is a *derivation*, realisation ensures that the
output paths of the derivation are [valid](../glossary.md) (i.e., output paths of the derivation are [valid] (i.e.,
the output path and its closure exist in the file system). This the output path and its closure exist in the file system). This
can be done in several ways. First, it is possible that the can be done in several ways. First, it is possible that the
outputs are already valid, in which case we are done outputs are already valid, in which case we are done
immediately. Otherwise, there may be [substitutes](../glossary.md) immediately. Otherwise, there may be [substitutes]
that produce the outputs (e.g., by downloading them). Finally, the that produce the outputs (e.g., by downloading them). Finally, the
outputs can be produced by running the build task described outputs can be produced by running the build task described
by the derivation. by the derivation.
@ -82,6 +82,9 @@ paths. Realisation is a somewhat overloaded term:
produced through substitutes. If there are no (successful) produced through substitutes. If there are no (successful)
substitutes, realisation fails. substitutes, realisation fails.
[valid]: ../glossary.md#gloss-validity
[substitutes]: ../glossary.md#gloss-substitute
The output path of each derivation is printed on standard output. (For The output path of each derivation is printed on standard output. (For
non-derivations argument, the argument itself is printed.) non-derivations argument, the argument itself is printed.)
@ -295,8 +298,8 @@ error: cannot delete path `/nix/store/zq0h41l75vlb4z45kzgjjmsjxvcv1qk7-mesa-6.4'
## Description ## Description
The operation `--query` displays various bits of information about the The operation `--query` displays information about [store path]s.
store paths . The queries are described below. At most one query can be The queries are described below. At most one query can be
specified. The default query is `--outputs`. specified. The default query is `--outputs`.
The paths *paths* may also be symlinks from outside of the Nix store, to The paths *paths* may also be symlinks from outside of the Nix store, to
@ -316,12 +319,12 @@ symlink.
## Queries ## Queries
- `--outputs`\ - `--outputs`\
Prints out the [output paths](../glossary.md) of the store Prints out the [output path]s of the store
derivations *paths*. These are the paths that will be produced when derivations *paths*. These are the paths that will be produced when
the derivation is built. the derivation is built.
- `--requisites`; `-R`\ - `--requisites`; `-R`\
Prints out the [closure](../glossary.md) of the store path *paths*. Prints out the [closure] of the given *paths*.
This query has one option: This query has one option:
@ -338,10 +341,12 @@ symlink.
derivation and specifying the option `--include-outputs`. derivation and specifying the option `--include-outputs`.
- `--references`\ - `--references`\
Prints the set of [references](../glossary.md) of the store paths Prints the set of [references]s of the store paths
*paths*, that is, their immediate dependencies. (For *all* *paths*, that is, their immediate dependencies. (For *all*
dependencies, use `--requisites`.) dependencies, use `--requisites`.)
[reference]: ../glossary.md#gloss-reference
- `--referrers`\ - `--referrers`\
Prints the set of *referrers* of the store paths *paths*, that is, Prints the set of *referrers* of the store paths *paths*, that is,
the store paths currently existing in the Nix store that refer to the store paths currently existing in the Nix store that refer to
@ -356,11 +361,13 @@ symlink.
in the Nix store that are dependent on *paths*. in the Nix store that are dependent on *paths*.
- `--deriver`; `-d`\ - `--deriver`; `-d`\
Prints the [deriver](../glossary.md) of the store paths *paths*. If Prints the [deriver] of the store paths *paths*. If
the path has no deriver (e.g., if it is a source file), or if the the path has no deriver (e.g., if it is a source file), or if the
deriver is not known (e.g., in the case of a binary-only deriver is not known (e.g., in the case of a binary-only
deployment), the string `unknown-deriver` is printed. deployment), the string `unknown-deriver` is printed.
[deriver]: ../glossary.md#gloss-deriver
- `--graph`\ - `--graph`\
Prints the references graph of the store paths *paths* in the format Prints the references graph of the store paths *paths* in the format
of the `dot` tool of AT\&T's [Graphviz of the `dot` tool of AT\&T's [Graphviz

3
doc/manual/src/contributing/hacking.md
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@ -92,7 +92,8 @@ $ nix develop
The unit-tests for each Nix library (`libexpr`, `libstore`, etc..) are defined The unit-tests for each Nix library (`libexpr`, `libstore`, etc..) are defined
under `src/{library_name}/tests` using the under `src/{library_name}/tests` using the
[googletest](https://google.github.io/googletest/) framework. [googletest](https://google.github.io/googletest/) and
[rapidcheck](https://github.com/emil-e/rapidcheck) frameworks.
You can run the whole testsuite with `make check`, or the tests for a specific component with `make libfoo-tests_RUN`. Finer-grained filtering is also possible using the [--gtest_filter](https://google.github.io/googletest/advanced.html#running-a-subset-of-the-tests) command-line option. You can run the whole testsuite with `make check`, or the tests for a specific component with `make libfoo-tests_RUN`. Finer-grained filtering is also possible using the [--gtest_filter](https://google.github.io/googletest/advanced.html#running-a-subset-of-the-tests) command-line option.

29
doc/manual/src/glossary.md
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@ -19,6 +19,17 @@
[store derivation]: #gloss-store-derivation [store derivation]: #gloss-store-derivation
- [realise]{#gloss-realise}, realisation\
Ensure a [store path] is [valid][validity].
This means either running the `builder` executable as specified in the corresponding [derivation] or fetching a pre-built [store object] from a [substituter].
See [`nix-build`](./command-ref/nix-build.md) and [`nix-store --realise`](./command-ref/nix-store.md#operation---realise).
See [`nix build`](./command-ref/new-cli/nix3-build.md) (experimental).
[realise]: #gloss-realise
- [content-addressed derivation]{#gloss-content-addressed-derivation}\ - [content-addressed derivation]{#gloss-content-addressed-derivation}\
A derivation which has the A derivation which has the
[`__contentAddressed`](./language/advanced-attributes.md#adv-attr-__contentAddressed) [`__contentAddressed`](./language/advanced-attributes.md#adv-attr-__contentAddressed)
@ -101,6 +112,8 @@
copy store objects it doesn't have. For details, see the copy store objects it doesn't have. For details, see the
[`substituters` option](./command-ref/conf-file.md#conf-substituters). [`substituters` option](./command-ref/conf-file.md#conf-substituters).
[substituter]: #gloss-substituter
- [purity]{#gloss-purity}\ - [purity]{#gloss-purity}\
The assumption that equal Nix derivations when run always produce The assumption that equal Nix derivations when run always produce
the same output. This cannot be guaranteed in general (e.g., a the same output. This cannot be guaranteed in general (e.g., a
@ -143,19 +156,25 @@
to path `Q`, then `Q` is in the closure of `P`. Further, if `Q` to path `Q`, then `Q` is in the closure of `P`. Further, if `Q`
references `R` then `R` is also in the closure of `P`. references `R` then `R` is also in the closure of `P`.
[closure]: #gloss-closure
- [output path]{#gloss-output-path}\ - [output path]{#gloss-output-path}\
A [store path] produced by a [derivation]. A [store path] produced by a [derivation].
[output path]: #gloss-output-path [output path]: #gloss-output-path
- [deriver]{#gloss-deriver}\ - [deriver]{#gloss-deriver}\
The deriver of an *output path* is the store The [store derivation] that produced an [output path].
derivation that built it.
- [validity]{#gloss-validity}\ - [validity]{#gloss-validity}\
A store path is considered *valid* if it exists in the file system, A store path is valid if all [store object]s in its [closure] can be read from the [store].
is listed in the Nix database as being valid, and if all paths in
its closure are also valid. For a local store, this means:
- The store path leads to an existing [store object] in that [store].
- The store path is listed in the Nix database as being valid.
- All paths in the store path's [closure] are valid.
[validity]: #gloss-validity
- [user environment]{#gloss-user-env}\ - [user environment]{#gloss-user-env}\
An automatically generated store object that consists of a set of An automatically generated store object that consists of a set of

4
doc/manual/src/language/index.md
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@ -191,12 +191,12 @@ This is an incomplete overview of language features, by example.
<tr> <tr>
<td> <td>
<nixpkgs> `<nixpkgs>`
</td> </td>
<td> <td>
Search path. Value determined by [`$NIX_PATH` environment variable](../command-ref/env-common.md#env-NIX_PATH). Search path for Nix files. Value determined by [`$NIX_PATH` environment variable](../command-ref/env-common.md#env-NIX_PATH).
</td> </td>
</tr> </tr>

8
doc/manual/src/language/operators.md
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@ -24,7 +24,7 @@
| [Equality] | *expr* `==` *expr* | none | 11 | | [Equality] | *expr* `==` *expr* | none | 11 |
| Inequality | *expr* `!=` *expr* | none | 11 | | Inequality | *expr* `!=` *expr* | none | 11 |
| Logical conjunction (`AND`) | *bool* `&&` *bool* | left | 12 | | Logical conjunction (`AND`) | *bool* `&&` *bool* | left | 12 |
| Logical disjunction (`OR`) | *bool* `||` *bool* | left | 13 | | Logical disjunction (`OR`) | *bool* `\|\|` *bool* | left | 13 |
| [Logical implication] | *bool* `->` *bool* | none | 14 | | [Logical implication] | *bool* `->` *bool* | none | 14 |
[string]: ./values.md#type-string [string]: ./values.md#type-string
@ -120,12 +120,12 @@ The result is a string.
## Update ## Update
> *attrset1* + *attrset2* > *attrset1* // *attrset2*
Update [attribute set] *attrset1* with names and values from *attrset2*. Update [attribute set] *attrset1* with names and values from *attrset2*.
The returned attribute set will have of all the attributes in *e1* and *e2*. The returned attribute set will have of all the attributes in *attrset1* and *attrset2*.
If an attribute name is present in both, the attribute value from the former is taken. If an attribute name is present in both, the attribute value from the latter is taken.
[Update]: #update [Update]: #update

4
doc/manual/src/release-notes/rl-2.13.md
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@ -18,6 +18,10 @@
* Instead of "antiquotation", the more common term [string interpolation](../language/string-interpolation.md) is now used consistently. * Instead of "antiquotation", the more common term [string interpolation](../language/string-interpolation.md) is now used consistently.
Historical release notes were not changed. Historical release notes were not changed.
* Error traces have been reworked to provide detailed explanations and more
accurate error locations. A short excerpt of the trace is now shown by
default when an error occurs.
* Allow explicitly selecting outputs in a store derivation installable, just like we can do with other sorts of installables. * Allow explicitly selecting outputs in a store derivation installable, just like we can do with other sorts of installables.
For example, For example,
```shell-session ```shell-session

8
doc/manual/src/release-notes/rl-next.md
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@ -1,2 +1,10 @@
# Release X.Y (202?-??-??) # Release X.Y (202?-??-??)
* A new function `builtins.readFileType` is available. It is similar to
`builtins.readDir` but acts on a single file or directory.
* The `builtins.readDir` function has been optimized when encountering not-yet-known
file types from POSIX's `readdir`. In such cases the type of each file is/was
discovered by making multiple syscalls. This change makes these operations
lazy such that these lookups will only be performed if the attribute is used.
This optimization affects a minority of filesystems and operating systems.

19
flake.nix
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@ -82,7 +82,9 @@
}); });
configureFlags = configureFlags =
lib.optionals stdenv.isLinux [ [
"CXXFLAGS=-I${lib.getDev rapidcheck}/extras/gtest/include"
] ++ lib.optionals stdenv.isLinux [
"--with-boost=${boost}/lib" "--with-boost=${boost}/lib"
"--with-sandbox-shell=${sh}/bin/busybox" "--with-sandbox-shell=${sh}/bin/busybox"
] ]
@ -116,6 +118,7 @@
boost boost
lowdown-nix lowdown-nix
gtest gtest
rapidcheck
] ]
++ lib.optionals stdenv.isLinux [libseccomp] ++ lib.optionals stdenv.isLinux [libseccomp]
++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
@ -128,9 +131,14 @@
}); });
propagatedDeps = propagatedDeps =
[ (boehmgc.override { [ ((boehmgc.override {
enableLargeConfig = true; enableLargeConfig = true;
}).overrideAttrs(o: {
patches = (o.patches or []) ++ [
./boehmgc-coroutine-sp-fallback.diff
];
}) })
)
nlohmann_json nlohmann_json
]; ];
}; };
@ -650,6 +658,7 @@
inherit system crossSystem; inherit system crossSystem;
overlays = [ self.overlays.default ]; overlays = [ self.overlays.default ];
}; };
inherit (nixpkgsCross) lib;
in with commonDeps { pkgs = nixpkgsCross; }; nixpkgsCross.stdenv.mkDerivation { in with commonDeps { pkgs = nixpkgsCross; }; nixpkgsCross.stdenv.mkDerivation {
name = "nix-super-${version}"; name = "nix-super-${version}";
@ -662,7 +671,11 @@
nativeBuildInputs = nativeBuildDeps; nativeBuildInputs = nativeBuildDeps;
buildInputs = buildDeps ++ propagatedDeps; buildInputs = buildDeps ++ propagatedDeps;
configureFlags = [ "--sysconfdir=/etc" "--disable-doc-gen" ]; configureFlags = [
"CXXFLAGS=-I${lib.getDev nixpkgsCross.rapidcheck}/extras/gtest/include"
"--sysconfdir=/etc"
"--disable-doc-gen"
];
enableParallelBuilding = true; enableParallelBuilding = true;

4
src/libcmd/installables.cc
View file

@ -630,7 +630,7 @@ ref<eval_cache::EvalCache> openEvalCache(
auto vFlake = state.allocValue(); auto vFlake = state.allocValue();
flake::callFlake(state, *lockedFlake, *vFlake); flake::callFlake(state, *lockedFlake, *vFlake);
state.forceAttrs(*vFlake, noPos); state.forceAttrs(*vFlake, noPos, "while parsing cached flake data");
auto aOutputs = vFlake->attrs->get(state.symbols.create("outputs")); auto aOutputs = vFlake->attrs->get(state.symbols.create("outputs"));
assert(aOutputs); assert(aOutputs);
@ -694,7 +694,7 @@ DerivedPathsWithInfo InstallableFlake::toDerivedPaths()
else if (v.type() == nString) { else if (v.type() == nString) {
PathSet context; PathSet context;
auto s = state->forceString(v, context, noPos); auto s = state->forceString(v, context, noPos, fmt("while evaluating the flake output attribute '%s'", attrPath));
auto storePath = state->store->maybeParseStorePath(s); auto storePath = state->store->maybeParseStorePath(s);
if (storePath && context.count(std::string(s))) { if (storePath && context.count(std::string(s))) {
return {{ return {{

8
src/libcmd/repl.cc
View file

@ -397,7 +397,7 @@ StringSet NixRepl::completePrefix(const std::string & prefix)
Expr * e = parseString(expr); Expr * e = parseString(expr);
Value v; Value v;
e->eval(*state, *env, v); e->eval(*state, *env, v);
state->forceAttrs(v, noPos); state->forceAttrs(v, noPos, "while evaluating an attrset for the purpose of completion (this error should not be displayed; file an issue?)");
for (auto & i : *v.attrs) { for (auto & i : *v.attrs) {
std::string_view name = state->symbols[i.name]; std::string_view name = state->symbols[i.name];
@ -590,7 +590,7 @@ bool NixRepl::processLine(std::string line)
const auto [path, line] = [&] () -> std::pair<Path, uint32_t> { const auto [path, line] = [&] () -> std::pair<Path, uint32_t> {
if (v.type() == nPath || v.type() == nString) { if (v.type() == nPath || v.type() == nString) {
PathSet context; PathSet context;
auto path = state->coerceToPath(noPos, v, context); auto path = state->coerceToPath(noPos, v, context, "while evaluating the filename to edit");
return {path, 0}; return {path, 0};
} else if (v.isLambda()) { } else if (v.isLambda()) {
auto pos = state->positions[v.lambda.fun->pos]; auto pos = state->positions[v.lambda.fun->pos];
@ -839,7 +839,7 @@ void NixRepl::loadFiles()
void NixRepl::addAttrsToScope(Value & attrs) void NixRepl::addAttrsToScope(Value & attrs)
{ {
state->forceAttrs(attrs, [&]() { return attrs.determinePos(noPos); }); state->forceAttrs(attrs, [&]() { return attrs.determinePos(noPos); }, "while evaluating an attribute set to be merged in the global scope");
if (displ + attrs.attrs->size() >= envSize) if (displ + attrs.attrs->size() >= envSize)
throw Error("environment full; cannot add more variables"); throw Error("environment full; cannot add more variables");
@ -944,7 +944,7 @@ std::ostream & NixRepl::printValue(std::ostream & str, Value & v, unsigned int m
Bindings::iterator i = v.attrs->find(state->sDrvPath); Bindings::iterator i = v.attrs->find(state->sDrvPath);
PathSet context; PathSet context;
if (i != v.attrs->end()) if (i != v.attrs->end())
str << state->store->printStorePath(state->coerceToStorePath(i->pos, *i->value, context)); str << state->store->printStorePath(state->coerceToStorePath(i->pos, *i->value, context, "while evaluating the drvPath of a derivation"));
else else
str << "???"; str << "???";
str << "»"; str << "»";

2
src/libexpr/attr-path.cc
View file

@ -118,7 +118,7 @@ std::pair<std::string, uint32_t> findPackageFilename(EvalState & state, Value &
// FIXME: is it possible to extract the Pos object instead of doing this // FIXME: is it possible to extract the Pos object instead of doing this
// toString + parsing? // toString + parsing?
auto pos = state.forceString(*v2); auto pos = state.forceString(*v2, noPos, "while evaluating the 'meta.position' attribute of a derivation");
auto colon = pos.rfind(':'); auto colon = pos.rfind(':');
if (colon == std::string::npos) if (colon == std::string::npos)

20
src/libexpr/eval-cache.cc
View file

@ -385,7 +385,7 @@ Value & AttrCursor::getValue()
if (!_value) { if (!_value) {
if (parent) { if (parent) {
auto & vParent = parent->first->getValue(); auto & vParent = parent->first->getValue();
root->state.forceAttrs(vParent, noPos); root->state.forceAttrs(vParent, noPos, "while searching for an attribute");
auto attr = vParent.attrs->get(parent->second); auto attr = vParent.attrs->get(parent->second);
if (!attr) if (!attr)
throw Error("attribute '%s' is unexpectedly missing", getAttrPathStr()); throw Error("attribute '%s' is unexpectedly missing", getAttrPathStr());
@ -571,14 +571,14 @@ std::string AttrCursor::getString()
debug("using cached string attribute '%s'", getAttrPathStr()); debug("using cached string attribute '%s'", getAttrPathStr());
return s->first; return s->first;
} else } else
root->state.debugThrowLastTrace(TypeError("'%s' is not a string", getAttrPathStr())); root->state.error("'%s' is not a string", getAttrPathStr()).debugThrow<TypeError>();
} }
} }
auto & v = forceValue(); auto & v = forceValue();
if (v.type() != nString && v.type() != nPath) if (v.type() != nString && v.type() != nPath)
root->state.debugThrowLastTrace(TypeError("'%s' is not a string but %s", getAttrPathStr(), showType(v.type()))); root->state.error("'%s' is not a string but %s", getAttrPathStr()).debugThrow<TypeError>();
return v.type() == nString ? v.string.s : v.path; return v.type() == nString ? v.string.s : v.path;
} }
@ -613,7 +613,7 @@ string_t AttrCursor::getStringWithContext()
return *s; return *s;
} }
} else } else
root->state.debugThrowLastTrace(TypeError("'%s' is not a string", getAttrPathStr())); root->state.error("'%s' is not a string", getAttrPathStr()).debugThrow<TypeError>();
} }
} }
@ -624,7 +624,7 @@ string_t AttrCursor::getStringWithContext()
else if (v.type() == nPath) else if (v.type() == nPath)
return {v.path, {}}; return {v.path, {}};
else else
root->state.debugThrowLastTrace(TypeError("'%s' is not a string but %s", getAttrPathStr(), showType(v.type()))); root->state.error("'%s' is not a string but %s", getAttrPathStr()).debugThrow<TypeError>();
} }
bool AttrCursor::getBool() bool AttrCursor::getBool()
@ -637,14 +637,14 @@ bool AttrCursor::getBool()
debug("using cached Boolean attribute '%s'", getAttrPathStr()); debug("using cached Boolean attribute '%s'", getAttrPathStr());
return *b; return *b;
} else } else
root->state.debugThrowLastTrace(TypeError("'%s' is not a Boolean", getAttrPathStr())); root->state.error("'%s' is not a Boolean", getAttrPathStr()).debugThrow<TypeError>();
} }
} }
auto & v = forceValue(); auto & v = forceValue();
if (v.type() != nBool) if (v.type() != nBool)
root->state.debugThrowLastTrace(TypeError("'%s' is not a Boolean", getAttrPathStr())); root->state.error("'%s' is not a Boolean", getAttrPathStr()).debugThrow<TypeError>();
return v.boolean; return v.boolean;
} }
@ -696,7 +696,7 @@ std::vector<std::string> AttrCursor::getListOfStrings()
std::vector<std::string> res; std::vector<std::string> res;
for (auto & elem : v.listItems()) for (auto & elem : v.listItems())
res.push_back(std::string(root->state.forceStringNoCtx(*elem))); res.push_back(std::string(root->state.forceStringNoCtx(*elem, noPos, "while evaluating an attribute for caching")));
if (root->db) if (root->db)
cachedValue = {root->db->setListOfStrings(getKey(), res), res}; cachedValue = {root->db->setListOfStrings(getKey(), res), res};
@ -714,14 +714,14 @@ std::vector<Symbol> AttrCursor::getAttrs()
debug("using cached attrset attribute '%s'", getAttrPathStr()); debug("using cached attrset attribute '%s'", getAttrPathStr());
return *attrs; return *attrs;
} else } else
root->state.debugThrowLastTrace(TypeError("'%s' is not an attribute set", getAttrPathStr())); root->state.error("'%s' is not an attribute set", getAttrPathStr()).debugThrow<TypeError>();
} }
} }
auto & v = forceValue(); auto & v = forceValue();
if (v.type() != nAttrs) if (v.type() != nAttrs)
root->state.debugThrowLastTrace(TypeError("'%s' is not an attribute set", getAttrPathStr())); root->state.error("'%s' is not an attribute set", getAttrPathStr()).debugThrow<TypeError>();
std::vector<Symbol> attrs; std::vector<Symbol> attrs;
for (auto & attr : *getValue().attrs) for (auto & attr : *getValue().attrs)

25
src/libexpr/eval-inline.hh
View file

@ -103,33 +103,36 @@ void EvalState::forceValue(Value & v, Callable getPos)
else if (v.isApp()) else if (v.isApp())
callFunction(*v.app.left, *v.app.right, v, noPos); callFunction(*v.app.left, *v.app.right, v, noPos);
else if (v.isBlackhole()) else if (v.isBlackhole())
throwEvalError(getPos(), "infinite recursion encountered"); error("infinite recursion encountered").atPos(getPos()).template debugThrow<EvalError>();
} }
[[gnu::always_inline]] [[gnu::always_inline]]
inline void EvalState::forceAttrs(Value & v, const PosIdx pos) inline void EvalState::forceAttrs(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
forceAttrs(v, [&]() { return pos; }); forceAttrs(v, [&]() { return pos; }, errorCtx);
} }
template <typename Callable> template <typename Callable>
[[gnu::always_inline]] [[gnu::always_inline]]
inline void EvalState::forceAttrs(Value & v, Callable getPos) inline void EvalState::forceAttrs(Value & v, Callable getPos, std::string_view errorCtx)
{ {
forceValue(v, getPos); forceValue(v, noPos);
if (v.type() != nAttrs) if (v.type() != nAttrs) {
throwTypeError(getPos(), "value is %1% while a set was expected", v); PosIdx pos = getPos();
error("value is %1% while a set was expected", showType(v)).withTrace(pos, errorCtx).debugThrow<TypeError>();
}
} }
[[gnu::always_inline]] [[gnu::always_inline]]
inline void EvalState::forceList(Value & v, const PosIdx pos) inline void EvalState::forceList(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
forceValue(v, pos); forceValue(v, noPos);
if (!v.isList()) if (!v.isList()) {
throwTypeError(pos, "value is %1% while a list was expected", v); error("value is %1% while a list was expected", showType(v)).withTrace(pos, errorCtx).debugThrow<TypeError>();
}
} }

540
src/libexpr/eval.cc
View file

@ -11,7 +11,9 @@
#include <algorithm> #include <algorithm>
#include <chrono> #include <chrono>
#include <iostream>
#include <cstring> #include <cstring>
#include <optional>
#include <unistd.h> #include <unistd.h>
#include <sys/time.h> #include <sys/time.h>
#include <sys/resource.h> #include <sys/resource.h>
@ -318,7 +320,7 @@ static Symbol getName(const AttrName & name, EvalState & state, Env & env)
} else { } else {
Value nameValue; Value nameValue;
name.expr->eval(state, env, nameValue); name.expr->eval(state, env, nameValue);
state.forceStringNoCtx(nameValue); state.forceStringNoCtx(nameValue, noPos, "while evaluating an attribute name");
return state.symbols.create(nameValue.string.s); return state.symbols.create(nameValue.string.s);
} }
} }
@ -414,6 +416,44 @@ static Strings parseNixPath(const std::string & s)
return res; return res;
} }
ErrorBuilder & ErrorBuilder::atPos(PosIdx pos)
{
info.errPos = state.positions[pos];
return *this;
}
ErrorBuilder & ErrorBuilder::withTrace(PosIdx pos, const std::string_view text)
{
info.traces.push_front(Trace{ .pos = state.positions[pos], .hint = hintformat(std::string(text)), .frame = false });
return *this;
}
ErrorBuilder & ErrorBuilder::withFrameTrace(PosIdx pos, const std::string_view text)
{
info.traces.push_front(Trace{ .pos = state.positions[pos], .hint = hintformat(std::string(text)), .frame = true });
return *this;
}
ErrorBuilder & ErrorBuilder::withSuggestions(Suggestions & s)
{
info.suggestions = s;
return *this;
}
ErrorBuilder & ErrorBuilder::withFrame(const Env & env, const Expr & expr)
{
// NOTE: This is abusing side-effects.
// TODO: check compatibility with nested debugger calls.
state.debugTraces.push_front(DebugTrace {
.pos = nullptr,
.expr = expr,
.env = env,
.hint = hintformat("Fake frame for debugging purposes"),
.isError = true
});
return *this;
}
EvalState::EvalState( EvalState::EvalState(
const Strings & _searchPath, const Strings & _searchPath,
@ -646,25 +686,7 @@ void EvalState::addConstant(const std::string & name, Value * v)
Value * EvalState::addPrimOp(const std::string & name, Value * EvalState::addPrimOp(const std::string & name,
size_t arity, PrimOpFun primOp) size_t arity, PrimOpFun primOp)
{ {
auto name2 = name.substr(0, 2) == "__" ? name.substr(2) : name; return addPrimOp(PrimOp { .fun = primOp, .arity = arity, .name = name });
auto sym = symbols.create(name2);
/* Hack to make constants lazy: turn them into a application of
the primop to a dummy value. */
if (arity == 0) {
auto vPrimOp = allocValue();
vPrimOp->mkPrimOp(new PrimOp { .fun = primOp, .arity = 1, .name = name2 });
Value v;
v.mkApp(vPrimOp, vPrimOp);
return addConstant(name, v);
}
Value * v = allocValue();
v->mkPrimOp(new PrimOp { .fun = primOp, .arity = arity, .name = name2 });
staticBaseEnv->vars.emplace_back(symbols.create(name), baseEnvDispl);
baseEnv.values[baseEnvDispl++] = v;
baseEnv.values[0]->attrs->push_back(Attr(sym, v));
return v;
} }
@ -842,176 +864,14 @@ void EvalState::runDebugRepl(const Error * error, const Env & env, const Expr &
} }
} }
/* Every "format" object (even temporary) takes up a few hundred bytes
of stack space, which is a real killer in the recursive
evaluator. So here are some helper functions for throwing
exceptions. */
void EvalState::throwEvalError(const PosIdx pos, const char * s, Env & env, Expr & expr)
{
debugThrow(EvalError({
.msg = hintfmt(s),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::throwEvalError(const PosIdx pos, const char * s)
{
debugThrowLastTrace(EvalError({
.msg = hintfmt(s),
.errPos = positions[pos]
}));
}
void EvalState::throwEvalError(const char * s, const std::string & s2)
{
debugThrowLastTrace(EvalError(s, s2));
}
void EvalState::throwEvalError(const PosIdx pos, const Suggestions & suggestions, const char * s,
const std::string & s2, Env & env, Expr & expr)
{
debugThrow(EvalError(ErrorInfo{
.msg = hintfmt(s, s2),
.errPos = positions[pos],
.suggestions = suggestions,
}), env, expr);
}
void EvalState::throwEvalError(const PosIdx pos, const char * s, const std::string & s2)
{
debugThrowLastTrace(EvalError({
.msg = hintfmt(s, s2),
.errPos = positions[pos]
}));
}
void EvalState::throwEvalError(const PosIdx pos, const char * s, const std::string & s2, Env & env, Expr & expr)
{
debugThrow(EvalError({
.msg = hintfmt(s, s2),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::throwEvalError(const char * s, const std::string & s2,
const std::string & s3)
{
debugThrowLastTrace(EvalError({
.msg = hintfmt(s, s2, s3),
.errPos = positions[noPos]
}));
}
void EvalState::throwEvalError(const PosIdx pos, const char * s, const std::string & s2,
const std::string & s3)
{
debugThrowLastTrace(EvalError({
.msg = hintfmt(s, s2, s3),
.errPos = positions[pos]
}));
}
void EvalState::throwEvalError(const PosIdx pos, const char * s, const std::string & s2,
const std::string & s3, Env & env, Expr & expr)
{
debugThrow(EvalError({
.msg = hintfmt(s, s2, s3),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::throwEvalError(const PosIdx p1, const char * s, const Symbol sym, const PosIdx p2, Env & env, Expr & expr)
{
// p1 is where the error occurred; p2 is a position mentioned in the message.
debugThrow(EvalError({
.msg = hintfmt(s, symbols[sym], positions[p2]),
.errPos = positions[p1]
}), env, expr);
}
void EvalState::throwTypeError(const PosIdx pos, const char * s, const Value & v)
{
debugThrowLastTrace(TypeError({
.msg = hintfmt(s, showType(v)),
.errPos = positions[pos]
}));
}
void EvalState::throwTypeError(const PosIdx pos, const char * s, const Value & v, Env & env, Expr & expr)
{
debugThrow(TypeError({
.msg = hintfmt(s, showType(v)),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::throwTypeError(const PosIdx pos, const char * s)
{
debugThrowLastTrace(TypeError({
.msg = hintfmt(s),
.errPos = positions[pos]
}));
}
void EvalState::throwTypeError(const PosIdx pos, const char * s, const ExprLambda & fun,
const Symbol s2, Env & env, Expr &expr)
{
debugThrow(TypeError({
.msg = hintfmt(s, fun.showNamePos(*this), symbols[s2]),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::throwTypeError(const PosIdx pos, const Suggestions & suggestions, const char * s,
const ExprLambda & fun, const Symbol s2, Env & env, Expr &expr)
{
debugThrow(TypeError(ErrorInfo {
.msg = hintfmt(s, fun.showNamePos(*this), symbols[s2]),
.errPos = positions[pos],
.suggestions = suggestions,
}), env, expr);
}
void EvalState::throwTypeError(const char * s, const Value & v, Env & env, Expr &expr)
{
debugThrow(TypeError({
.msg = hintfmt(s, showType(v)),
.errPos = positions[expr.getPos()],
}), env, expr);
}
void EvalState::throwAssertionError(const PosIdx pos, const char * s, const std::string & s1, Env & env, Expr &expr)
{
debugThrow(AssertionError({
.msg = hintfmt(s, s1),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::throwUndefinedVarError(const PosIdx pos, const char * s, const std::string & s1, Env & env, Expr &expr)
{
debugThrow(UndefinedVarError({
.msg = hintfmt(s, s1),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::throwMissingArgumentError(const PosIdx pos, const char * s, const std::string & s1, Env & env, Expr &expr)
{
debugThrow(MissingArgumentError({
.msg = hintfmt(s, s1),
.errPos = positions[pos]
}), env, expr);
}
void EvalState::addErrorTrace(Error & e, const char * s, const std::string & s2) const void EvalState::addErrorTrace(Error & e, const char * s, const std::string & s2) const
{ {
e.addTrace(nullptr, s, s2); e.addTrace(nullptr, s, s2);
} }
void EvalState::addErrorTrace(Error & e, const PosIdx pos, const char * s, const std::string & s2) const void EvalState::addErrorTrace(Error & e, const PosIdx pos, const char * s, const std::string & s2, bool frame) const
{ {
e.addTrace(positions[pos], s, s2); e.addTrace(positions[pos], hintfmt(s, s2), frame);
} }
static std::unique_ptr<DebugTraceStacker> makeDebugTraceStacker( static std::unique_ptr<DebugTraceStacker> makeDebugTraceStacker(
@ -1088,7 +948,7 @@ inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
if (env->type == Env::HasWithExpr) { if (env->type == Env::HasWithExpr) {
if (noEval) return 0; if (noEval) return 0;
Value * v = allocValue(); Value * v = allocValue();
evalAttrs(*env->up, (Expr *) env->values[0], *v); evalAttrs(*env->up, (Expr *) env->values[0], *v, noPos, "<borked>");
env->values[0] = v; env->values[0] = v;
env->type = Env::HasWithAttrs; env->type = Env::HasWithAttrs;
} }
@ -1098,7 +958,7 @@ inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
return j->value; return j->value;
} }
if (!env->prevWith) if (!env->prevWith)
throwUndefinedVarError(var.pos, "undefined variable '%1%'", symbols[var.name], *env, const_cast<ExprVar&>(var)); error("undefined variable '%1%'", symbols[var.name]).atPos(var.pos).withFrame(*env, var).debugThrow<UndefinedVarError>();
for (size_t l = env->prevWith; l; --l, env = env->up) ; for (size_t l = env->prevWith; l; --l, env = env->up) ;
} }
} }
@ -1248,7 +1108,7 @@ void EvalState::cacheFile(
// computation. // computation.
if (mustBeTrivial && if (mustBeTrivial &&
!(dynamic_cast<ExprAttrs *>(e))) !(dynamic_cast<ExprAttrs *>(e)))
throw EvalError("file '%s' must be an attribute set", path); error("file '%s' must be an attribute set", path).debugThrow<EvalError>();
eval(e, v); eval(e, v);
} catch (Error & e) { } catch (Error & e) {
addErrorTrace(e, "while evaluating the file '%1%':", resolvedPath); addErrorTrace(e, "while evaluating the file '%1%':", resolvedPath);
@ -1266,31 +1126,31 @@ void EvalState::eval(Expr * e, Value & v)
} }
inline bool EvalState::evalBool(Env & env, Expr * e) inline bool EvalState::evalBool(Env & env, Expr * e, const PosIdx pos, std::string_view errorCtx)
{ {
try {
Value v; Value v;
e->eval(*this, env, v); e->eval(*this, env, v);
if (v.type() != nBool) if (v.type() != nBool)
throwTypeError(noPos, "value is %1% while a Boolean was expected", v, env, *e); error("value is %1% while a Boolean was expected", showType(v)).withFrame(env, *e).debugThrow<TypeError>();
return v.boolean; return v.boolean;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
} }
inline bool EvalState::evalBool(Env & env, Expr * e, const PosIdx pos) inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const PosIdx pos, std::string_view errorCtx)
{
Value v;
e->eval(*this, env, v);
if (v.type() != nBool)
throwTypeError(pos, "value is %1% while a Boolean was expected", v, env, *e);
return v.boolean;
}
inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v)
{ {
try {
e->eval(*this, env, v); e->eval(*this, env, v);
if (v.type() != nAttrs) if (v.type() != nAttrs)
throwTypeError(noPos, "value is %1% while a set was expected", v, env, *e); error("value is %1% while a set was expected", showType(v)).withFrame(env, *e).debugThrow<TypeError>();
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
} }
@ -1363,7 +1223,7 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
Hence we need __overrides.) */ Hence we need __overrides.) */
if (hasOverrides) { if (hasOverrides) {
Value * vOverrides = (*v.attrs)[overrides->second.displ].value; Value * vOverrides = (*v.attrs)[overrides->second.displ].value;
state.forceAttrs(*vOverrides, [&]() { return vOverrides->determinePos(noPos); }); state.forceAttrs(*vOverrides, [&]() { return vOverrides->determinePos(noPos); }, "while evaluating the `__overrides` attribute");
Bindings * newBnds = state.allocBindings(v.attrs->capacity() + vOverrides->attrs->size()); Bindings * newBnds = state.allocBindings(v.attrs->capacity() + vOverrides->attrs->size());
for (auto & i : *v.attrs) for (auto & i : *v.attrs)
newBnds->push_back(i); newBnds->push_back(i);
@ -1391,11 +1251,11 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
state.forceValue(nameVal, i.pos); state.forceValue(nameVal, i.pos);
if (nameVal.type() == nNull) if (nameVal.type() == nNull)
continue; continue;
state.forceStringNoCtx(nameVal); state.forceStringNoCtx(nameVal, i.pos, "while evaluating the name of a dynamic attribute");
auto nameSym = state.symbols.create(nameVal.string.s); auto nameSym = state.symbols.create(nameVal.string.s);
Bindings::iterator j = v.attrs->find(nameSym); Bindings::iterator j = v.attrs->find(nameSym);
if (j != v.attrs->end()) if (j != v.attrs->end())
state.throwEvalError(i.pos, "dynamic attribute '%1%' already defined at %2%", nameSym, j->pos, env, *this); state.error("dynamic attribute '%1%' already defined at %2%", state.symbols[nameSym], state.positions[j->pos]).atPos(i.pos).withFrame(env, *this).debugThrow<EvalError>();
i.valueExpr->setName(nameSym); i.valueExpr->setName(nameSym);
/* Keep sorted order so find can catch duplicates */ /* Keep sorted order so find can catch duplicates */
@ -1492,15 +1352,14 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
return; return;
} }
} else { } else {
state.forceAttrs(*vAttrs, pos); state.forceAttrs(*vAttrs, pos, "while selecting an attribute");
if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) { if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) {
std::set<std::string> allAttrNames; std::set<std::string> allAttrNames;
for (auto & attr : *vAttrs->attrs) for (auto & attr : *vAttrs->attrs)
allAttrNames.insert(state.symbols[attr.name]); allAttrNames.insert(state.symbols[attr.name]);
state.throwEvalError( auto suggestions = Suggestions::bestMatches(allAttrNames, state.symbols[name]);
pos, state.error("attribute '%1%' missing", state.symbols[name])
Suggestions::bestMatches(allAttrNames, state.symbols[name]), .atPos(pos).withSuggestions(suggestions).withFrame(env, *this).debugThrow<EvalError>();
"attribute '%1%' missing", state.symbols[name], env, *this);
} }
} }
vAttrs = j->value; vAttrs = j->value;
@ -1595,7 +1454,12 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
if (!lambda.hasFormals()) if (!lambda.hasFormals())
env2.values[displ++] = args[0]; env2.values[displ++] = args[0];
else { else {
forceAttrs(*args[0], pos); try {
forceAttrs(*args[0], lambda.pos, "while evaluating the value passed for the lambda argument");
} catch (Error & e) {
if (pos) e.addTrace(positions[pos], "from call site");
throw;
}
if (lambda.arg) if (lambda.arg)
env2.values[displ++] = args[0]; env2.values[displ++] = args[0];
@ -1607,8 +1471,15 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
for (auto & i : lambda.formals->formals) { for (auto & i : lambda.formals->formals) {
auto j = args[0]->attrs->get(i.name); auto j = args[0]->attrs->get(i.name);
if (!j) { if (!j) {
if (!i.def) throwTypeError(pos, "%1% called without required argument '%2%'", if (!i.def) {
lambda, i.name, *fun.lambda.env, lambda); error("function '%1%' called without required argument '%2%'",
(lambda.name ? std::string(symbols[lambda.name]) : "anonymous lambda"),
symbols[i.name])
.atPos(lambda.pos)
.withTrace(pos, "from call site")
.withFrame(*fun.lambda.env, lambda)
.debugThrow<TypeError>();
}
env2.values[displ++] = i.def->maybeThunk(*this, env2); env2.values[displ++] = i.def->maybeThunk(*this, env2);
} else { } else {
attrsUsed++; attrsUsed++;
@ -1626,11 +1497,15 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
std::set<std::string> formalNames; std::set<std::string> formalNames;
for (auto & formal : lambda.formals->formals) for (auto & formal : lambda.formals->formals)
formalNames.insert(symbols[formal.name]); formalNames.insert(symbols[formal.name]);
throwTypeError( auto suggestions = Suggestions::bestMatches(formalNames, symbols[i.name]);
pos, error("function '%1%' called with unexpected argument '%2%'",
Suggestions::bestMatches(formalNames, symbols[i.name]), (lambda.name ? std::string(symbols[lambda.name]) : "anonymous lambda"),
"%1% called with unexpected argument '%2%'", symbols[i.name])
lambda, i.name, *fun.lambda.env, lambda); .atPos(lambda.pos)
.withTrace(pos, "from call site")
.withSuggestions(suggestions)
.withFrame(*fun.lambda.env, lambda)
.debugThrow<TypeError>();
} }
abort(); // can't happen abort(); // can't happen
} }
@ -1653,11 +1528,15 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
lambda.body->eval(*this, env2, vCur); lambda.body->eval(*this, env2, vCur);
} catch (Error & e) { } catch (Error & e) {
if (loggerSettings.showTrace.get()) { if (loggerSettings.showTrace.get()) {
addErrorTrace(e, lambda.pos, "while calling %s", addErrorTrace(
(lambda.name e,
lambda.pos,
"while calling %s",
lambda.name
? concatStrings("'", symbols[lambda.name], "'") ? concatStrings("'", symbols[lambda.name], "'")
: "anonymous lambda")); : "anonymous lambda",
addErrorTrace(e, pos, "while evaluating call site%s", ""); true);
if (pos) addErrorTrace(e, pos, "from call site%s", "", true);
} }
throw; throw;
} }
@ -1676,9 +1555,17 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
return; return;
} else { } else {
/* We have all the arguments, so call the primop. */ /* We have all the arguments, so call the primop. */
auto name = vCur.primOp->name;
nrPrimOpCalls++; nrPrimOpCalls++;
if (countCalls) primOpCalls[vCur.primOp->name]++; if (countCalls) primOpCalls[name]++;
vCur.primOp->fun(*this, pos, args, vCur);
try {
vCur.primOp->fun(*this, noPos, args, vCur);
} catch (Error & e) {
addErrorTrace(e, pos, "while calling the '%1%' builtin", name);
throw;
}
nrArgs -= argsLeft; nrArgs -= argsLeft;
args += argsLeft; args += argsLeft;
@ -1713,9 +1600,20 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
for (size_t i = 0; i < argsLeft; ++i) for (size_t i = 0; i < argsLeft; ++i)
vArgs[argsDone + i] = args[i]; vArgs[argsDone + i] = args[i];
auto name = primOp->primOp->name;
nrPrimOpCalls++; nrPrimOpCalls++;
if (countCalls) primOpCalls[primOp->primOp->name]++; if (countCalls) primOpCalls[name]++;
primOp->primOp->fun(*this, pos, vArgs, vCur);
try {
// TODO:
// 1. Unify this and above code. Heavily redundant.
// 2. Create a fake env (arg1, arg2, etc.) and a fake expr (arg1: arg2: etc: builtins.name arg1 arg2 etc)
// so the debugger allows to inspect the wrong parameters passed to the builtin.
primOp->primOp->fun(*this, noPos, vArgs, vCur);
} catch (Error & e) {
addErrorTrace(e, pos, "while calling the '%1%' builtin", name);
throw;
}
nrArgs -= argsLeft; nrArgs -= argsLeft;
args += argsLeft; args += argsLeft;
@ -1728,14 +1626,18 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
heap-allocate a copy and use that instead. */ heap-allocate a copy and use that instead. */
Value * args2[] = {allocValue(), args[0]}; Value * args2[] = {allocValue(), args[0]};
*args2[0] = vCur; *args2[0] = vCur;
/* !!! Should we use the attr pos here? */ try {
callFunction(*functor->value, 2, args2, vCur, pos); callFunction(*functor->value, 2, args2, vCur, functor->pos);
} catch (Error & e) {
e.addTrace(positions[pos], "while calling a functor (an attribute set with a '__functor' attribute)");
throw;
}
nrArgs--; nrArgs--;
args++; args++;
} }
else else
throwTypeError(pos, "attempt to call something which is not a function but %1%", vCur); error("attempt to call something which is not a function but %1%", showType(vCur)).atPos(pos).debugThrow<TypeError>();
} }
vRes = vCur; vRes = vCur;
@ -1799,13 +1701,12 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
if (j != args.end()) { if (j != args.end()) {
attrs.insert(*j); attrs.insert(*j);
} else if (!i.def) { } else if (!i.def) {
throwMissingArgumentError(i.pos, R"(cannot evaluate a function that has an argument without a value ('%1%') error(R"(cannot evaluate a function that has an argument without a value ('%1%')
Nix attempted to evaluate a function as a top level expression; in Nix attempted to evaluate a function as a top level expression; in
this case it must have its arguments supplied either by default this case it must have its arguments supplied either by default
values, or passed explicitly with '--arg' or '--argstr'. See values, or passed explicitly with '--arg' or '--argstr'. See
https://nixos.org/manual/nix/stable/language/constructs.html#functions.)", symbols[i.name], https://nixos.org/manual/nix/stable/language/constructs.html#functions.)", symbols[i.name])
*fun.lambda.env, *fun.lambda.fun); .atPos(i.pos).withFrame(*fun.lambda.env, *fun.lambda.fun).debugThrow<MissingArgumentError>();
} }
} }
} }
@ -1828,16 +1729,17 @@ void ExprWith::eval(EvalState & state, Env & env, Value & v)
void ExprIf::eval(EvalState & state, Env & env, Value & v) void ExprIf::eval(EvalState & state, Env & env, Value & v)
{ {
(state.evalBool(env, cond, pos) ? then : else_)->eval(state, env, v); // We cheat in the parser, and pass the position of the condition as the position of the if itself.
(state.evalBool(env, cond, pos, "while evaluating a branch condition") ? then : else_)->eval(state, env, v);
} }
void ExprAssert::eval(EvalState & state, Env & env, Value & v) void ExprAssert::eval(EvalState & state, Env & env, Value & v)
{ {
if (!state.evalBool(env, cond, pos)) { if (!state.evalBool(env, cond, pos, "in the condition of the assert statement")) {
std::ostringstream out; std::ostringstream out;
cond->show(state.symbols, out); cond->show(state.symbols, out);
state.throwAssertionError(pos, "assertion '%1%' failed", out.str(), env, *this); state.error("assertion '%1%' failed", out.str()).atPos(pos).withFrame(env, *this).debugThrow<AssertionError>();
} }
body->eval(state, env, v); body->eval(state, env, v);
} }
@ -1845,7 +1747,7 @@ void ExprAssert::eval(EvalState & state, Env & env, Value & v)
void ExprOpNot::eval(EvalState & state, Env & env, Value & v) void ExprOpNot::eval(EvalState & state, Env & env, Value & v)
{ {
v.mkBool(!state.evalBool(env, e)); v.mkBool(!state.evalBool(env, e, noPos, "in the argument of the not operator")); // XXX: FIXME: !
} }
@ -1853,7 +1755,7 @@ void ExprOpEq::eval(EvalState & state, Env & env, Value & v)
{ {
Value v1; e1->eval(state, env, v1); Value v1; e1->eval(state, env, v1);
Value v2; e2->eval(state, env, v2); Value v2; e2->eval(state, env, v2);
v.mkBool(state.eqValues(v1, v2)); v.mkBool(state.eqValues(v1, v2, pos, "while testing two values for equality"));
} }
@ -1861,33 +1763,33 @@ void ExprOpNEq::eval(EvalState & state, Env & env, Value & v)
{ {
Value v1; e1->eval(state, env, v1); Value v1; e1->eval(state, env, v1);
Value v2; e2->eval(state, env, v2); Value v2; e2->eval(state, env, v2);
v.mkBool(!state.eqValues(v1, v2)); v.mkBool(!state.eqValues(v1, v2, pos, "while testing two values for inequality"));
} }
void ExprOpAnd::eval(EvalState & state, Env & env, Value & v) void ExprOpAnd::eval(EvalState & state, Env & env, Value & v)
{ {
v.mkBool(state.evalBool(env, e1, pos) && state.evalBool(env, e2, pos)); v.mkBool(state.evalBool(env, e1, pos, "in the left operand of the AND (&&) operator") && state.evalBool(env, e2, pos, "in the right operand of the AND (&&) operator"));
} }
void ExprOpOr::eval(EvalState & state, Env & env, Value & v) void ExprOpOr::eval(EvalState & state, Env & env, Value & v)
{ {
v.mkBool(state.evalBool(env, e1, pos) || state.evalBool(env, e2, pos)); v.mkBool(state.evalBool(env, e1, pos, "in the left operand of the OR (||) operator") || state.evalBool(env, e2, pos, "in the right operand of the OR (||) operator"));
} }
void ExprOpImpl::eval(EvalState & state, Env & env, Value & v) void ExprOpImpl::eval(EvalState & state, Env & env, Value & v)
{ {
v.mkBool(!state.evalBool(env, e1, pos) || state.evalBool(env, e2, pos)); v.mkBool(!state.evalBool(env, e1, pos, "in the left operand of the IMPL (->) operator") || state.evalBool(env, e2, pos, "in the right operand of the IMPL (->) operator"));
} }
void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v) void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v)
{ {
Value v1, v2; Value v1, v2;
state.evalAttrs(env, e1, v1); state.evalAttrs(env, e1, v1, pos, "in the left operand of the update (//) operator");
state.evalAttrs(env, e2, v2); state.evalAttrs(env, e2, v2, pos, "in the right operand of the update (//) operator");
state.nrOpUpdates++; state.nrOpUpdates++;
@ -1926,18 +1828,18 @@ void ExprOpConcatLists::eval(EvalState & state, Env & env, Value & v)
Value v1; e1->eval(state, env, v1); Value v1; e1->eval(state, env, v1);
Value v2; e2->eval(state, env, v2); Value v2; e2->eval(state, env, v2);
Value * lists[2] = { &v1, &v2 }; Value * lists[2] = { &v1, &v2 };
state.concatLists(v, 2, lists, pos); state.concatLists(v, 2, lists, pos, "while evaluating one of the elements to concatenate");
} }
void EvalState::concatLists(Value & v, size_t nrLists, Value * * lists, const PosIdx pos) void EvalState::concatLists(Value & v, size_t nrLists, Value * * lists, const PosIdx pos, std::string_view errorCtx)
{ {
nrListConcats++; nrListConcats++;
Value * nonEmpty = 0; Value * nonEmpty = 0;
size_t len = 0; size_t len = 0;
for (size_t n = 0; n < nrLists; ++n) { for (size_t n = 0; n < nrLists; ++n) {
forceList(*lists[n], pos); forceList(*lists[n], pos, errorCtx);
auto l = lists[n]->listSize(); auto l = lists[n]->listSize();
len += l; len += l;
if (l) nonEmpty = lists[n]; if (l) nonEmpty = lists[n];
@ -2014,20 +1916,22 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
nf = n; nf = n;
nf += vTmp.fpoint; nf += vTmp.fpoint;
} else } else
state.throwEvalError(i_pos, "cannot add %1% to an integer", showType(vTmp), env, *this); state.error("cannot add %1% to an integer", showType(vTmp)).atPos(i_pos).withFrame(env, *this).debugThrow<EvalError>();
} else if (firstType == nFloat) { } else if (firstType == nFloat) {
if (vTmp.type() == nInt) { if (vTmp.type() == nInt) {
nf += vTmp.integer; nf += vTmp.integer;
} else if (vTmp.type() == nFloat) { } else if (vTmp.type() == nFloat) {
nf += vTmp.fpoint; nf += vTmp.fpoint;
} else } else
state.throwEvalError(i_pos, "cannot add %1% to a float", showType(vTmp), env, *this); state.error("cannot add %1% to a float", showType(vTmp)).atPos(i_pos).withFrame(env, *this).debugThrow<EvalError>();
} else { } else {
if (s.empty()) s.reserve(es->size()); if (s.empty()) s.reserve(es->size());
/* skip canonization of first path, which would only be not /* skip canonization of first path, which would only be not
canonized in the first place if it's coming from a ./${foo} type canonized in the first place if it's coming from a ./${foo} type
path */ path */
auto part = state.coerceToString(i_pos, vTmp, context, false, firstType == nString, !first); auto part = state.coerceToString(i_pos, vTmp, context,
"while evaluating a path segment",
false, firstType == nString, !first);
sSize += part->size(); sSize += part->size();
s.emplace_back(std::move(part)); s.emplace_back(std::move(part));
} }
@ -2041,7 +1945,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
v.mkFloat(nf); v.mkFloat(nf);
else if (firstType == nPath) { else if (firstType == nPath) {
if (!context.empty()) if (!context.empty())
state.throwEvalError(pos, "a string that refers to a store path cannot be appended to a path", env, *this); state.error("a string that refers to a store path cannot be appended to a path").atPos(pos).withFrame(env, *this).debugThrow<EvalError>();
v.mkPath(canonPath(str())); v.mkPath(canonPath(str()));
} else } else
v.mkStringMove(c_str(), context); v.mkStringMove(c_str(), context);
@ -2091,33 +1995,47 @@ void EvalState::forceValueDeep(Value & v)
} }
NixInt EvalState::forceInt(Value & v, const PosIdx pos) NixInt EvalState::forceInt(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
try {
forceValue(v, pos); forceValue(v, pos);
if (v.type() != nInt) if (v.type() != nInt)
throwTypeError(pos, "value is %1% while an integer was expected", v); error("value is %1% while an integer was expected", showType(v)).debugThrow<TypeError>();
return v.integer; return v.integer;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
} }
NixFloat EvalState::forceFloat(Value & v, const PosIdx pos) NixFloat EvalState::forceFloat(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
try {
forceValue(v, pos); forceValue(v, pos);
if (v.type() == nInt) if (v.type() == nInt)
return v.integer; return v.integer;
else if (v.type() != nFloat) else if (v.type() != nFloat)
throwTypeError(pos, "value is %1% while a float was expected", v); error("value is %1% while a float was expected", showType(v)).debugThrow<TypeError>();
return v.fpoint; return v.fpoint;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
} }
bool EvalState::forceBool(Value & v, const PosIdx pos) bool EvalState::forceBool(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
try {
forceValue(v, pos); forceValue(v, pos);
if (v.type() != nBool) if (v.type() != nBool)
throwTypeError(pos, "value is %1% while a Boolean was expected", v); error("value is %1% while a Boolean was expected", showType(v)).debugThrow<TypeError>();
return v.boolean; return v.boolean;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
} }
@ -2127,21 +2045,30 @@ bool EvalState::isFunctor(Value & fun)
} }
void EvalState::forceFunction(Value & v, const PosIdx pos) void EvalState::forceFunction(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
try {
forceValue(v, pos); forceValue(v, pos);
if (v.type() != nFunction && !isFunctor(v)) if (v.type() != nFunction && !isFunctor(v))
throwTypeError(pos, "value is %1% while a function was expected", v); error("value is %1% while a function was expected", showType(v)).debugThrow<TypeError>();
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
} }
std::string_view EvalState::forceString(Value & v, const PosIdx pos) std::string_view EvalState::forceString(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
try {
forceValue(v, pos); forceValue(v, pos);
if (v.type() != nString) { if (v.type() != nString)
throwTypeError(pos, "value is %1% while a string was expected", v); error("value is %1% while a string was expected", showType(v)).debugThrow<TypeError>();
}
return v.string.s; return v.string.s;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
} }
@ -2164,24 +2091,19 @@ NixStringContext Value::getContext(const Store & store)
} }
std::string_view EvalState::forceString(Value & v, PathSet & context, const PosIdx pos) std::string_view EvalState::forceString(Value & v, PathSet & context, const PosIdx pos, std::string_view errorCtx)
{ {
auto s = forceString(v, pos); auto s = forceString(v, pos, errorCtx);
copyContext(v, context); copyContext(v, context);
return s; return s;
} }
std::string_view EvalState::forceStringNoCtx(Value & v, const PosIdx pos) std::string_view EvalState::forceStringNoCtx(Value & v, const PosIdx pos, std::string_view errorCtx)
{ {
auto s = forceString(v, pos); auto s = forceString(v, pos, errorCtx);
if (v.string.context) { if (v.string.context) {
if (pos) error("the string '%1%' is not allowed to refer to a store path (such as '%2%')", v.string.s, v.string.context[0]).withTrace(pos, errorCtx).debugThrow<EvalError>();
throwEvalError(pos, "the string '%1%' is not allowed to refer to a store path (such as '%2%')",
v.string.s, v.string.context[0]);
else
throwEvalError("the string '%1%' is not allowed to refer to a store path (such as '%2%')",
v.string.s, v.string.context[0]);
} }
return s; return s;
} }
@ -2205,14 +2127,16 @@ std::optional<std::string> EvalState::tryAttrsToString(const PosIdx pos, Value &
if (i != v.attrs->end()) { if (i != v.attrs->end()) {
Value v1; Value v1;
callFunction(*i->value, v, v1, pos); callFunction(*i->value, v, v1, pos);
return coerceToString(pos, v1, context, coerceMore, copyToStore).toOwned(); return coerceToString(pos, v1, context,
"while evaluating the result of the `__toString` attribute",
coerceMore, copyToStore).toOwned();
} }
return {}; return {};
} }
BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet & context, BackedStringView EvalState::coerceToString(const PosIdx pos, Value &v, PathSet &context,
bool coerceMore, bool copyToStore, bool canonicalizePath) std::string_view errorCtx, bool coerceMore, bool copyToStore, bool canonicalizePath)
{ {
forceValue(v, pos); forceValue(v, pos);
@ -2235,13 +2159,23 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet
if (maybeString) if (maybeString)
return std::move(*maybeString); return std::move(*maybeString);
auto i = v.attrs->find(sOutPath); auto i = v.attrs->find(sOutPath);
if (i == v.attrs->end()) if (i == v.attrs->end()) {
throwTypeError(pos, "cannot coerce a set to a string"); error("cannot coerce %1% to a string", showType(v))
return coerceToString(pos, *i->value, context, coerceMore, copyToStore); .withTrace(pos, errorCtx)
.debugThrow<TypeError>();
}
return coerceToString(pos, *i->value, context, errorCtx,
coerceMore, copyToStore, canonicalizePath);
} }
if (v.type() == nExternal) if (v.type() == nExternal) {
try {
return v.external->coerceToString(positions[pos], context, coerceMore, copyToStore); return v.external->coerceToString(positions[pos], context, coerceMore, copyToStore);
} catch (Error & e) {
e.addTrace(nullptr, errorCtx);
throw;
}
}
if (coerceMore) { if (coerceMore) {
/* Note that `false' is represented as an empty string for /* Note that `false' is represented as an empty string for
@ -2255,7 +2189,14 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet
if (v.isList()) { if (v.isList()) {
std::string result; std::string result;
for (auto [n, v2] : enumerate(v.listItems())) { for (auto [n, v2] : enumerate(v.listItems())) {
result += *coerceToString(pos, *v2, context, coerceMore, copyToStore); try {
result += *coerceToString(noPos, *v2, context,
"while evaluating one element of the list",
coerceMore, copyToStore, canonicalizePath);
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
if (n < v.listSize() - 1 if (n < v.listSize() - 1
/* !!! not quite correct */ /* !!! not quite correct */
&& (!v2->isList() || v2->listSize() != 0)) && (!v2->isList() || v2->listSize() != 0))
@ -2265,14 +2206,16 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet
} }
} }
throwTypeError(pos, "cannot coerce %1% to a string", v); error("cannot coerce %1% to a string", showType(v))
.withTrace(pos, errorCtx)
.debugThrow<TypeError>();
} }
StorePath EvalState::copyPathToStore(PathSet & context, const Path & path) StorePath EvalState::copyPathToStore(PathSet & context, const Path & path)
{ {
if (nix::isDerivation(path)) if (nix::isDerivation(path))
throwEvalError("file names are not allowed to end in '%1%'", drvExtension); error("file names are not allowed to end in '%1%'", drvExtension).debugThrow<EvalError>();
auto dstPath = [&]() -> StorePath auto dstPath = [&]() -> StorePath
{ {
@ -2293,28 +2236,25 @@ StorePath EvalState::copyPathToStore(PathSet & context, const Path & path)
} }
Path EvalState::coerceToPath(const PosIdx pos, Value & v, PathSet & context) Path EvalState::coerceToPath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx)
{ {
auto path = coerceToString(pos, v, context, false, false).toOwned(); auto path = coerceToString(pos, v, context, errorCtx, false, false, true).toOwned();
if (path == "" || path[0] != '/') if (path == "" || path[0] != '/')
throwEvalError(pos, "string '%1%' doesn't represent an absolute path", path); error("string '%1%' doesn't represent an absolute path", path).withTrace(pos, errorCtx).debugThrow<EvalError>();
return path; return path;
} }
StorePath EvalState::coerceToStorePath(const PosIdx pos, Value & v, PathSet & context) StorePath EvalState::coerceToStorePath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx)
{ {
auto path = coerceToString(pos, v, context, false, false).toOwned(); auto path = coerceToString(pos, v, context, errorCtx, false, false, true).toOwned();
if (auto storePath = store->maybeParseStorePath(path)) if (auto storePath = store->maybeParseStorePath(path))
return *storePath; return *storePath;
throw EvalError({ error("path '%1%' is not in the Nix store", path).withTrace(pos, errorCtx).debugThrow<EvalError>();
.msg = hintfmt("path '%1%' is not in the Nix store", path),
.errPos = positions[pos]
});
} }
bool EvalState::eqValues(Value & v1, Value & v2) bool EvalState::eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_view errorCtx)
{ {
forceValue(v1, noPos); forceValue(v1, noPos);
forceValue(v2, noPos); forceValue(v2, noPos);
@ -2334,7 +2274,6 @@ bool EvalState::eqValues(Value & v1, Value & v2)
if (v1.type() != v2.type()) return false; if (v1.type() != v2.type()) return false;
switch (v1.type()) { switch (v1.type()) {
case nInt: case nInt:
return v1.integer == v2.integer; return v1.integer == v2.integer;
@ -2353,7 +2292,7 @@ bool EvalState::eqValues(Value & v1, Value & v2)
case nList: case nList:
if (v1.listSize() != v2.listSize()) return false; if (v1.listSize() != v2.listSize()) return false;
for (size_t n = 0; n < v1.listSize(); ++n) for (size_t n = 0; n < v1.listSize(); ++n)
if (!eqValues(*v1.listElems()[n], *v2.listElems()[n])) return false; if (!eqValues(*v1.listElems()[n], *v2.listElems()[n], pos, errorCtx)) return false;
return true; return true;
case nAttrs: { case nAttrs: {
@ -2363,7 +2302,7 @@ bool EvalState::eqValues(Value & v1, Value & v2)
Bindings::iterator i = v1.attrs->find(sOutPath); Bindings::iterator i = v1.attrs->find(sOutPath);
Bindings::iterator j = v2.attrs->find(sOutPath); Bindings::iterator j = v2.attrs->find(sOutPath);
if (i != v1.attrs->end() && j != v2.attrs->end()) if (i != v1.attrs->end() && j != v2.attrs->end())
return eqValues(*i->value, *j->value); return eqValues(*i->value, *j->value, pos, errorCtx);
} }
if (v1.attrs->size() != v2.attrs->size()) return false; if (v1.attrs->size() != v2.attrs->size()) return false;
@ -2371,7 +2310,7 @@ bool EvalState::eqValues(Value & v1, Value & v2)
/* Otherwise, compare the attributes one by one. */ /* Otherwise, compare the attributes one by one. */
Bindings::iterator i, j; Bindings::iterator i, j;
for (i = v1.attrs->begin(), j = v2.attrs->begin(); i != v1.attrs->end(); ++i, ++j) for (i = v1.attrs->begin(), j = v2.attrs->begin(); i != v1.attrs->end(); ++i, ++j)
if (i->name != j->name || !eqValues(*i->value, *j->value)) if (i->name != j->name || !eqValues(*i->value, *j->value, pos, errorCtx))
return false; return false;
return true; return true;
@ -2388,9 +2327,7 @@ bool EvalState::eqValues(Value & v1, Value & v2)
return v1.fpoint == v2.fpoint; return v1.fpoint == v2.fpoint;
default: default:
throwEvalError("cannot compare %1% with %2%", error("cannot compare %1% with %2%", showType(v1), showType(v2)).withTrace(pos, errorCtx).debugThrow<EvalError>();
showType(v1),
showType(v2));
} }
} }
@ -2517,8 +2454,7 @@ void EvalState::printStats()
std::string ExternalValueBase::coerceToString(const Pos & pos, PathSet & context, bool copyMore, bool copyToStore) const std::string ExternalValueBase::coerceToString(const Pos & pos, PathSet & context, bool copyMore, bool copyToStore) const
{ {
throw TypeError({ throw TypeError({
.msg = hintfmt("cannot coerce %1% to a string", showType()), .msg = hintfmt("cannot coerce %1% to a string", showType())
.errPos = pos
}); });
} }

176
src/libexpr/eval.hh
View file

@ -86,6 +86,43 @@ struct DebugTrace {
void debugError(Error * e, Env & env, Expr & expr); void debugError(Error * e, Env & env, Expr & expr);
class ErrorBuilder
{
private:
EvalState & state;
ErrorInfo info;
ErrorBuilder(EvalState & s, ErrorInfo && i): state(s), info(i) { }
public:
template<typename... Args>
[[nodiscard, gnu::noinline]]
static ErrorBuilder * create(EvalState & s, const Args & ... args)
{
return new ErrorBuilder(s, ErrorInfo { .msg = hintfmt(args...) });
}
[[nodiscard, gnu::noinline]]
ErrorBuilder & atPos(PosIdx pos);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withTrace(PosIdx pos, const std::string_view text);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withFrameTrace(PosIdx pos, const std::string_view text);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withSuggestions(Suggestions & s);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withFrame(const Env & e, const Expr & ex);
template<class ErrorType>
[[gnu::noinline, gnu::noreturn]]
void debugThrow();
};
class EvalState : public std::enable_shared_from_this<EvalState> class EvalState : public std::enable_shared_from_this<EvalState>
{ {
public: public:
@ -145,29 +182,38 @@ public:
template<class E> template<class E>
[[gnu::noinline, gnu::noreturn]] [[gnu::noinline, gnu::noreturn]]
void debugThrow(E && error, const Env & env, const Expr & expr) void debugThrowLastTrace(E && error)
{ {
if (debugRepl) debugThrow(error, nullptr, nullptr);
runDebugRepl(&error, env, expr);
throw std::move(error);
} }
template<class E> template<class E>
[[gnu::noinline, gnu::noreturn]] [[gnu::noinline, gnu::noreturn]]
void debugThrowLastTrace(E && e) void debugThrow(E && error, const Env * env, const Expr * expr)
{ {
// Call this in the situation where Expr and Env are inaccessible. if (debugRepl && ((env && expr) || !debugTraces.empty())) {
// The debugger will start in the last context that's in the if (!env || !expr) {
// DebugTrace stack.
if (debugRepl && !debugTraces.empty()) {
const DebugTrace & last = debugTraces.front(); const DebugTrace & last = debugTraces.front();
runDebugRepl(&e, last.env, last.expr); env = &last.env;
expr = &last.expr;
}
runDebugRepl(&error, *env, *expr);
} }
throw std::move(e); throw std::move(error);
} }
// This is dangerous, but gets in line with the idea that error creation and
// throwing should not allocate on the stack of hot functions.
// as long as errors are immediately thrown, it works.
ErrorBuilder * errorBuilder;
template<typename... Args>
[[nodiscard, gnu::noinline]]
ErrorBuilder & error(const Args & ... args) {
errorBuilder = ErrorBuilder::create(*this, args...);
return *errorBuilder;
}
private: private:
SrcToStore srcToStore; SrcToStore srcToStore;
@ -282,8 +328,8 @@ public:
/* Evaluation the expression, then verify that it has the expected /* Evaluation the expression, then verify that it has the expected
type. */ type. */
inline bool evalBool(Env & env, Expr * e); inline bool evalBool(Env & env, Expr * e);
inline bool evalBool(Env & env, Expr * e, const PosIdx pos); inline bool evalBool(Env & env, Expr * e, const PosIdx pos, std::string_view errorCtx);
inline void evalAttrs(Env & env, Expr * e, Value & v); inline void evalAttrs(Env & env, Expr * e, Value & v, const PosIdx pos, std::string_view errorCtx);
/* If `v' is a thunk, enter it and overwrite `v' with the result /* If `v' is a thunk, enter it and overwrite `v' with the result
of the evaluation of the thunk. If `v' is a delayed function of the evaluation of the thunk. If `v' is a delayed function
@ -299,89 +345,25 @@ public:
void forceValueDeep(Value & v); void forceValueDeep(Value & v);
/* Force `v', and then verify that it has the expected type. */ /* Force `v', and then verify that it has the expected type. */
NixInt forceInt(Value & v, const PosIdx pos); NixInt forceInt(Value & v, const PosIdx pos, std::string_view errorCtx);
NixFloat forceFloat(Value & v, const PosIdx pos); NixFloat forceFloat(Value & v, const PosIdx pos, std::string_view errorCtx);
bool forceBool(Value & v, const PosIdx pos); bool forceBool(Value & v, const PosIdx pos, std::string_view errorCtx);
void forceAttrs(Value & v, const PosIdx pos); void forceAttrs(Value & v, const PosIdx pos, std::string_view errorCtx);
template <typename Callable> template <typename Callable>
inline void forceAttrs(Value & v, Callable getPos); inline void forceAttrs(Value & v, Callable getPos, std::string_view errorCtx);
inline void forceList(Value & v, const PosIdx pos); inline void forceList(Value & v, const PosIdx pos, std::string_view errorCtx);
void forceFunction(Value & v, const PosIdx pos); // either lambda or primop void forceFunction(Value & v, const PosIdx pos, std::string_view errorCtx); // either lambda or primop
std::string_view forceString(Value & v, const PosIdx pos = noPos); std::string_view forceString(Value & v, const PosIdx pos, std::string_view errorCtx);
std::string_view forceString(Value & v, PathSet & context, const PosIdx pos = noPos); std::string_view forceString(Value & v, PathSet & context, const PosIdx pos, std::string_view errorCtx);
std::string_view forceStringNoCtx(Value & v, const PosIdx pos = noPos); std::string_view forceStringNoCtx(Value & v, const PosIdx pos, std::string_view errorCtx);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx pos, const char * s);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx pos, const char * s,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const char * s, const std::string & s2);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx pos, const char * s, const std::string & s2);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const char * s, const std::string & s2,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx pos, const char * s, const std::string & s2,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const char * s, const std::string & s2, const std::string & s3,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx pos, const char * s, const std::string & s2, const std::string & s3,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx pos, const char * s, const std::string & s2, const std::string & s3);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const char * s, const std::string & s2, const std::string & s3);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx pos, const Suggestions & suggestions, const char * s, const std::string & s2,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwEvalError(const PosIdx p1, const char * s, const Symbol sym, const PosIdx p2,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwTypeError(const PosIdx pos, const char * s, const Value & v);
[[gnu::noinline, gnu::noreturn]]
void throwTypeError(const PosIdx pos, const char * s, const Value & v,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwTypeError(const PosIdx pos, const char * s);
[[gnu::noinline, gnu::noreturn]]
void throwTypeError(const PosIdx pos, const char * s,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwTypeError(const PosIdx pos, const char * s, const ExprLambda & fun, const Symbol s2,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwTypeError(const PosIdx pos, const Suggestions & suggestions, const char * s, const ExprLambda & fun, const Symbol s2,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwTypeError(const char * s, const Value & v,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwAssertionError(const PosIdx pos, const char * s, const std::string & s1,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwUndefinedVarError(const PosIdx pos, const char * s, const std::string & s1,
Env & env, Expr & expr);
[[gnu::noinline, gnu::noreturn]]
void throwMissingArgumentError(const PosIdx pos, const char * s, const std::string & s1,
Env & env, Expr & expr);
[[gnu::noinline]] [[gnu::noinline]]
void addErrorTrace(Error & e, const char * s, const std::string & s2) const; void addErrorTrace(Error & e, const char * s, const std::string & s2) const;
[[gnu::noinline]] [[gnu::noinline]]
void addErrorTrace(Error & e, const PosIdx pos, const char * s, const std::string & s2) const; void addErrorTrace(Error & e, const PosIdx pos, const char * s, const std::string & s2, bool frame = false) const;
public: public:
/* Return true iff the value `v' denotes a derivation (i.e. a /* Return true iff the value `v' denotes a derivation (i.e. a
@ -396,6 +378,7 @@ public:
booleans and lists to a string. If `copyToStore' is set, booleans and lists to a string. If `copyToStore' is set,
referenced paths are copied to the Nix store as a side effect. */ referenced paths are copied to the Nix store as a side effect. */
BackedStringView coerceToString(const PosIdx pos, Value & v, PathSet & context, BackedStringView coerceToString(const PosIdx pos, Value & v, PathSet & context,
std::string_view errorCtx,
bool coerceMore = false, bool copyToStore = true, bool coerceMore = false, bool copyToStore = true,
bool canonicalizePath = true); bool canonicalizePath = true);
@ -404,10 +387,10 @@ public:
/* Path coercion. Converts strings, paths and derivations to a /* Path coercion. Converts strings, paths and derivations to a
path. The result is guaranteed to be a canonicalised, absolute path. The result is guaranteed to be a canonicalised, absolute
path. Nothing is copied to the store. */ path. Nothing is copied to the store. */
Path coerceToPath(const PosIdx pos, Value & v, PathSet & context); Path coerceToPath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx);
/* Like coerceToPath, but the result must be a store path. */ /* Like coerceToPath, but the result must be a store path. */
StorePath coerceToStorePath(const PosIdx pos, Value & v, PathSet & context); StorePath coerceToStorePath(const PosIdx pos, Value & v, PathSet & context, std::string_view errorCtx);
public: public:
@ -467,7 +450,7 @@ public:
/* Do a deep equality test between two values. That is, list /* Do a deep equality test between two values. That is, list
elements and attributes are compared recursively. */ elements and attributes are compared recursively. */
bool eqValues(Value & v1, Value & v2); bool eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_view errorCtx);
bool isFunctor(Value & fun); bool isFunctor(Value & fun);
@ -502,7 +485,7 @@ public:
void mkThunk_(Value & v, Expr * expr); void mkThunk_(Value & v, Expr * expr);
void mkPos(Value & v, PosIdx pos); void mkPos(Value & v, PosIdx pos);
void concatLists(Value & v, size_t nrLists, Value * * lists, const PosIdx pos); void concatLists(Value & v, size_t nrLists, Value * * lists, const PosIdx pos, std::string_view errorCtx);
/* Print statistics. */ /* Print statistics. */
void printStats(); void printStats();
@ -665,6 +648,13 @@ extern EvalSettings evalSettings;
static const std::string corepkgsPrefix{"/__corepkgs__/"}; static const std::string corepkgsPrefix{"/__corepkgs__/"};
template<class ErrorType>
void ErrorBuilder::debugThrow()
{
// NOTE: We always use the -LastTrace version as we push the new trace in withFrame()
state.debugThrowLastTrace(ErrorType(info));
}
} }
#include "eval-inline.hh" #include "eval-inline.hh"

12
src/libexpr/flake/flake.cc
View file

@ -259,28 +259,28 @@ static Flake getFlake(
if (setting.value->type() == nString) if (setting.value->type() == nString)
flake.config.settings.emplace( flake.config.settings.emplace(
state.symbols[setting.name], state.symbols[setting.name],
std::string(state.forceStringNoCtx(*setting.value, setting.pos))); std::string(state.forceStringNoCtx(*setting.value, setting.pos, "")));
else if (setting.value->type() == nPath) { else if (setting.value->type() == nPath) {
PathSet emptyContext = {}; PathSet emptyContext = {};
flake.config.settings.emplace( flake.config.settings.emplace(
state.symbols[setting.name], state.symbols[setting.name],
state.coerceToString(setting.pos, *setting.value, emptyContext, false, true, true) .toOwned()); state.coerceToString(setting.pos, *setting.value, emptyContext, "", false, true, true) .toOwned());
} }
else if (setting.value->type() == nInt) else if (setting.value->type() == nInt)
flake.config.settings.emplace( flake.config.settings.emplace(
state.symbols[setting.name], state.symbols[setting.name],
state.forceInt(*setting.value, setting.pos)); state.forceInt(*setting.value, setting.pos, ""));
else if (setting.value->type() == nBool) else if (setting.value->type() == nBool)
flake.config.settings.emplace( flake.config.settings.emplace(
state.symbols[setting.name], state.symbols[setting.name],
Explicit<bool> { state.forceBool(*setting.value, setting.pos) }); Explicit<bool> { state.forceBool(*setting.value, setting.pos, "") });
else if (setting.value->type() == nList) { else if (setting.value->type() == nList) {
std::vector<std::string> ss; std::vector<std::string> ss;
for (auto elem : setting.value->listItems()) { for (auto elem : setting.value->listItems()) {
if (elem->type() != nString) if (elem->type() != nString)
throw TypeError("list element in flake configuration setting '%s' is %s while a string is expected", throw TypeError("list element in flake configuration setting '%s' is %s while a string is expected",
state.symbols[setting.name], showType(*setting.value)); state.symbols[setting.name], showType(*setting.value));
ss.emplace_back(state.forceStringNoCtx(*elem, setting.pos)); ss.emplace_back(state.forceStringNoCtx(*elem, setting.pos, ""));
} }
flake.config.settings.emplace(state.symbols[setting.name], ss); flake.config.settings.emplace(state.symbols[setting.name], ss);
} }
@ -741,7 +741,7 @@ void callFlake(EvalState & state,
static void prim_getFlake(EvalState & state, const PosIdx pos, Value * * args, Value & v) static void prim_getFlake(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{ {
std::string flakeRefS(state.forceStringNoCtx(*args[0], pos)); std::string flakeRefS(state.forceStringNoCtx(*args[0], pos, "while evaluating the argument passed to builtins.getFlake"));
auto flakeRef = parseFlakeRef(flakeRefS, {}, true); auto flakeRef = parseFlakeRef(flakeRefS, {}, true);
if (evalSettings.pureEval && !flakeRef.input.isLocked()) if (evalSettings.pureEval && !flakeRef.input.isLocked())
throw Error("cannot call 'getFlake' on unlocked flake reference '%s', at %s (use --impure to override)", flakeRefS, state.positions[pos]); throw Error("cannot call 'getFlake' on unlocked flake reference '%s', at %s (use --impure to override)", flakeRefS, state.positions[pos]);

24
src/libexpr/get-drvs.cc
View file

@ -51,7 +51,7 @@ std::string DrvInfo::queryName() const
if (name == "" && attrs) { if (name == "" && attrs) {
auto i = attrs->find(state->sName); auto i = attrs->find(state->sName);
if (i == attrs->end()) throw TypeError("derivation name missing"); if (i == attrs->end()) throw TypeError("derivation name missing");
name = state->forceStringNoCtx(*i->value); name = state->forceStringNoCtx(*i->value, noPos, "while evaluating the 'name' attribute of a derivation");
} }
return name; return name;
} }
@ -61,7 +61,7 @@ std::string DrvInfo::querySystem() const
{ {
if (system == "" && attrs) { if (system == "" && attrs) {
auto i = attrs->find(state->sSystem); auto i = attrs->find(state->sSystem);
system = i == attrs->end() ? "unknown" : state->forceStringNoCtx(*i->value, i->pos); system = i == attrs->end() ? "unknown" : state->forceStringNoCtx(*i->value, i->pos, "while evaluating the 'system' attribute of a derivation");
} }
return system; return system;
} }
@ -75,7 +75,7 @@ std::optional<StorePath> DrvInfo::queryDrvPath() const
if (i == attrs->end()) if (i == attrs->end())
drvPath = {std::nullopt}; drvPath = {std::nullopt};
else else
drvPath = {state->coerceToStorePath(i->pos, *i->value, context)}; drvPath = {state->coerceToStorePath(i->pos, *i->value, context, "while evaluating the 'drvPath' attribute of a derivation")};
} }
return drvPath.value_or(std::nullopt); return drvPath.value_or(std::nullopt);
} }
@ -95,7 +95,7 @@ StorePath DrvInfo::queryOutPath() const
Bindings::iterator i = attrs->find(state->sOutPath); Bindings::iterator i = attrs->find(state->sOutPath);
PathSet context; PathSet context;
if (i != attrs->end()) if (i != attrs->end())
outPath = state->coerceToStorePath(i->pos, *i->value, context); outPath = state->coerceToStorePath(i->pos, *i->value, context, "while evaluating the output path of a derivation");
} }
if (!outPath) if (!outPath)
throw UnimplementedError("CA derivations are not yet supported"); throw UnimplementedError("CA derivations are not yet supported");
@ -109,23 +109,23 @@ DrvInfo::Outputs DrvInfo::queryOutputs(bool withPaths, bool onlyOutputsToInstall
/* Get the ‘outputs’ list. */ /* Get the ‘outputs’ list. */
Bindings::iterator i; Bindings::iterator i;
if (attrs && (i = attrs->find(state->sOutputs)) != attrs->end()) { if (attrs && (i = attrs->find(state->sOutputs)) != attrs->end()) {
state->forceList(*i->value, i->pos); state->forceList(*i->value, i->pos, "while evaluating the 'outputs' attribute of a derivation");
/* For each output... */ /* For each output... */
for (auto elem : i->value->listItems()) { for (auto elem : i->value->listItems()) {
std::string output(state->forceStringNoCtx(*elem, i->pos)); std::string output(state->forceStringNoCtx(*elem, i->pos, "while evaluating the name of an output of a derivation"));
if (withPaths) { if (withPaths) {
/* Evaluate the corresponding set. */ /* Evaluate the corresponding set. */
Bindings::iterator out = attrs->find(state->symbols.create(output)); Bindings::iterator out = attrs->find(state->symbols.create(output));
if (out == attrs->end()) continue; // FIXME: throw error? if (out == attrs->end()) continue; // FIXME: throw error?
state->forceAttrs(*out->value, i->pos); state->forceAttrs(*out->value, i->pos, "while evaluating an output of a derivation");
/* And evaluate its ‘outPath’ attribute. */ /* And evaluate its ‘outPath’ attribute. */
Bindings::iterator outPath = out->value->attrs->find(state->sOutPath); Bindings::iterator outPath = out->value->attrs->find(state->sOutPath);
if (outPath == out->value->attrs->end()) continue; // FIXME: throw error? if (outPath == out->value->attrs->end()) continue; // FIXME: throw error?
PathSet context; PathSet context;
outputs.emplace(output, state->coerceToStorePath(outPath->pos, *outPath->value, context)); outputs.emplace(output, state->coerceToStorePath(outPath->pos, *outPath->value, context, "while evaluating an output path of a derivation"));
} else } else
outputs.emplace(output, std::nullopt); outputs.emplace(output, std::nullopt);
} }
@ -137,7 +137,7 @@ DrvInfo::Outputs DrvInfo::queryOutputs(bool withPaths, bool onlyOutputsToInstall
return outputs; return outputs;
Bindings::iterator i; Bindings::iterator i;
if (attrs && (i = attrs->find(state->sOutputSpecified)) != attrs->end() && state->forceBool(*i->value, i->pos)) { if (attrs && (i = attrs->find(state->sOutputSpecified)) != attrs->end() && state->forceBool(*i->value, i->pos, "while evaluating the 'outputSpecified' attribute of a derivation")) {
Outputs result; Outputs result;
auto out = outputs.find(queryOutputName()); auto out = outputs.find(queryOutputName());
if (out == outputs.end()) if (out == outputs.end())
@ -169,7 +169,7 @@ std::string DrvInfo::queryOutputName() const
{ {
if (outputName == "" && attrs) { if (outputName == "" && attrs) {
Bindings::iterator i = attrs->find(state->sOutputName); Bindings::iterator i = attrs->find(state->sOutputName);
outputName = i != attrs->end() ? state->forceStringNoCtx(*i->value) : ""; outputName = i != attrs->end() ? state->forceStringNoCtx(*i->value, noPos, "while evaluating the output name of a derivation") : "";
} }
return outputName; return outputName;
} }
@ -181,7 +181,7 @@ Bindings * DrvInfo::getMeta()
if (!attrs) return 0; if (!attrs) return 0;
Bindings::iterator a = attrs->find(state->sMeta); Bindings::iterator a = attrs->find(state->sMeta);
if (a == attrs->end()) return 0; if (a == attrs->end()) return 0;
state->forceAttrs(*a->value, a->pos); state->forceAttrs(*a->value, a->pos, "while evaluating the 'meta' attribute of a derivation");
meta = a->value->attrs; meta = a->value->attrs;
return meta; return meta;
} }
@ -382,7 +382,7 @@ static void getDerivations(EvalState & state, Value & vIn,
`recurseForDerivations = true' attribute. */ `recurseForDerivations = true' attribute. */
if (i->value->type() == nAttrs) { if (i->value->type() == nAttrs) {
Bindings::iterator j = i->value->attrs->find(state.sRecurseForDerivations); Bindings::iterator j = i->value->attrs->find(state.sRecurseForDerivations);
if (j != i->value->attrs->end() && state.forceBool(*j->value, j->pos)) if (j != i->value->attrs->end() && state.forceBool(*j->value, j->pos, "while evaluating the attribute `recurseForDerivations`"))
getDerivations(state, *i->value, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures); getDerivations(state, *i->value, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
} }
} }

1
src/libexpr/nixexpr.hh
View file

@ -8,7 +8,6 @@
#include "error.hh" #include "error.hh"
#include "chunked-vector.hh" #include "chunked-vector.hh"
namespace nix { namespace nix {

32
src/libexpr/parser.y
View file

@ -401,22 +401,22 @@ expr_op
| '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__sub")), {new ExprInt(0), $2}); } | '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__sub")), {new ExprInt(0), $2}); }
| expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); } | expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
| expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); } | expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
| expr_op '<' expr_op { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__lessThan")), {$1, $3}); } | expr_op '<' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$1, $3}); }
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__lessThan")), {$3, $1})); } | expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$3, $1})); }
| expr_op '>' expr_op { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__lessThan")), {$3, $1}); } | expr_op '>' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$3, $1}); }
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__lessThan")), {$1, $3})); } | expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__lessThan")), {$1, $3})); }
| expr_op AND expr_op { $$ = new ExprOpAnd(CUR_POS, $1, $3); } | expr_op AND expr_op { $$ = new ExprOpAnd(makeCurPos(@2, data), $1, $3); }
| expr_op OR expr_op { $$ = new ExprOpOr(CUR_POS, $1, $3); } | expr_op OR expr_op { $$ = new ExprOpOr(makeCurPos(@2, data), $1, $3); }
| expr_op IMPL expr_op { $$ = new ExprOpImpl(CUR_POS, $1, $3); } | expr_op IMPL expr_op { $$ = new ExprOpImpl(makeCurPos(@2, data), $1, $3); }
| expr_op UPDATE expr_op { $$ = new ExprOpUpdate(CUR_POS, $1, $3); } | expr_op UPDATE expr_op { $$ = new ExprOpUpdate(makeCurPos(@2, data), $1, $3); }
| expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, *$3); } | expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, *$3); }
| expr_op '+' expr_op | expr_op '+' expr_op
{ $$ = new ExprConcatStrings(CUR_POS, false, new std::vector<std::pair<PosIdx, Expr *>>({{makeCurPos(@1, data), $1}, {makeCurPos(@3, data), $3}})); } { $$ = new ExprConcatStrings(makeCurPos(@2, data), false, new std::vector<std::pair<PosIdx, Expr *> >({{makeCurPos(@1, data), $1}, {makeCurPos(@3, data), $3}})); }
| expr_op '-' expr_op { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__sub")), {$1, $3}); } | expr_op '-' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__sub")), {$1, $3}); }
| expr_op '*' expr_op { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__mul")), {$1, $3}); } | expr_op '*' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__mul")), {$1, $3}); }
| expr_op '/' expr_op { $$ = new ExprCall(CUR_POS, new ExprVar(data->symbols.create("__div")), {$1, $3}); } | expr_op '/' expr_op { $$ = new ExprCall(makeCurPos(@2, data), new ExprVar(data->symbols.create("__div")), {$1, $3}); }
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(CUR_POS, $1, $3); } | expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(makeCurPos(@2, data), $1, $3); }
| expr_op '$' expr_op { $$ = new ExprCall(CUR_POS, $1, {$3}); } | expr_op '$' expr_op { $$ = new ExprCall(makeCurPos(@2, data), $1, {$3}); }
| expr_app | expr_app
; ;
@ -784,13 +784,13 @@ Path EvalState::findFile(SearchPath & searchPath, const std::string_view path, c
if (hasPrefix(path, "nix/")) if (hasPrefix(path, "nix/"))
return concatStrings(corepkgsPrefix, path.substr(4)); return concatStrings(corepkgsPrefix, path.substr(4));
debugThrowLastTrace(ThrownError({ debugThrow(ThrownError({
.msg = hintfmt(evalSettings.pureEval .msg = hintfmt(evalSettings.pureEval
? "cannot look up '<%s>' in pure evaluation mode (use '--impure' to override)" ? "cannot look up '<%s>' in pure evaluation mode (use '--impure' to override)"
: "file '%s' was not found in the Nix search path (add it using $NIX_PATH or -I)", : "file '%s' was not found in the Nix search path (add it using $NIX_PATH or -I)",
path), path),
.errPos = positions[pos] .errPos = positions[pos]
})); }), 0, 0);
} }

721
src/libexpr/primops.cc
View file

File diff suppressed because it is too large Load diff

32
src/libexpr/primops/context.cc
View file

@ -8,7 +8,7 @@ namespace nix {
static void prim_unsafeDiscardStringContext(EvalState & state, const PosIdx pos, Value * * args, Value & v) static void prim_unsafeDiscardStringContext(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
auto s = state.coerceToString(pos, *args[0], context); auto s = state.coerceToString(pos, *args[0], context, "while evaluating the argument passed to builtins.unsafeDiscardStringContext");
v.mkString(*s); v.mkString(*s);
} }
@ -18,7 +18,7 @@ static RegisterPrimOp primop_unsafeDiscardStringContext("__unsafeDiscardStringCo
static void prim_hasContext(EvalState & state, const PosIdx pos, Value * * args, Value & v) static void prim_hasContext(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
state.forceString(*args[0], context, pos); state.forceString(*args[0], context, pos, "while evaluating the argument passed to builtins.hasContext");
v.mkBool(!context.empty()); v.mkBool(!context.empty());
} }
@ -34,7 +34,7 @@ static RegisterPrimOp primop_hasContext("__hasContext", 1, prim_hasContext);
static void prim_unsafeDiscardOutputDependency(EvalState & state, const PosIdx pos, Value * * args, Value & v) static void prim_unsafeDiscardOutputDependency(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
auto s = state.coerceToString(pos, *args[0], context); auto s = state.coerceToString(pos, *args[0], context, "while evaluating the argument passed to builtins.unsafeDiscardOutputDependency");
PathSet context2; PathSet context2;
for (auto && p : context) { for (auto && p : context) {
@ -80,18 +80,16 @@ static void prim_getContext(EvalState & state, const PosIdx pos, Value * * args,
Strings outputs; Strings outputs;
}; };
PathSet context; PathSet context;
state.forceString(*args[0], context, pos); state.forceString(*args[0], context, pos, "while evaluating the argument passed to builtins.getContext");
auto contextInfos = std::map<StorePath, ContextInfo>(); auto contextInfos = std::map<StorePath, ContextInfo>();
for (const auto & p : context) { for (const auto & p : context) {
Path drv;
std::string output;
NixStringContextElem ctx = NixStringContextElem::parse(*state.store, p); NixStringContextElem ctx = NixStringContextElem::parse(*state.store, p);
std::visit(overloaded { std::visit(overloaded {
[&](NixStringContextElem::DrvDeep & d) { [&](NixStringContextElem::DrvDeep & d) {
contextInfos[d.drvPath].allOutputs = true; contextInfos[d.drvPath].allOutputs = true;
}, },
[&](NixStringContextElem::Built & b) { [&](NixStringContextElem::Built & b) {
contextInfos[b.drvPath].outputs.emplace_back(std::move(output)); contextInfos[b.drvPath].outputs.emplace_back(std::move(b.output));
}, },
[&](NixStringContextElem::Opaque & o) { [&](NixStringContextElem::Opaque & o) {
contextInfos[o.path].path = true; contextInfos[o.path].path = true;
@ -132,9 +130,9 @@ static RegisterPrimOp primop_getContext("__getContext", 1, prim_getContext);
static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * args, Value & v) static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
auto orig = state.forceString(*args[0], context, pos); auto orig = state.forceString(*args[0], context, noPos, "while evaluating the first argument passed to builtins.appendContext");
state.forceAttrs(*args[1], pos); state.forceAttrs(*args[1], pos, "while evaluating the second argument passed to builtins.appendContext");
auto sPath = state.symbols.create("path"); auto sPath = state.symbols.create("path");
auto sAllOutputs = state.symbols.create("allOutputs"); auto sAllOutputs = state.symbols.create("allOutputs");
@ -142,24 +140,24 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
const auto & name = state.symbols[i.name]; const auto & name = state.symbols[i.name];
if (!state.store->isStorePath(name)) if (!state.store->isStorePath(name))
throw EvalError({ throw EvalError({
.msg = hintfmt("Context key '%s' is not a store path", name), .msg = hintfmt("context key '%s' is not a store path", name),
.errPos = state.positions[i.pos] .errPos = state.positions[i.pos]
}); });
if (!settings.readOnlyMode) if (!settings.readOnlyMode)
state.store->ensurePath(state.store->parseStorePath(name)); state.store->ensurePath(state.store->parseStorePath(name));
state.forceAttrs(*i.value, i.pos); state.forceAttrs(*i.value, i.pos, "while evaluating the value of a string context");
auto iter = i.value->attrs->find(sPath); auto iter = i.value->attrs->find(sPath);
if (iter != i.value->attrs->end()) { if (iter != i.value->attrs->end()) {
if (state.forceBool(*iter->value, iter->pos)) if (state.forceBool(*iter->value, iter->pos, "while evaluating the `path` attribute of a string context"))
context.emplace(name); context.emplace(name);
} }
iter = i.value->attrs->find(sAllOutputs); iter = i.value->attrs->find(sAllOutputs);
if (iter != i.value->attrs->end()) { if (iter != i.value->attrs->end()) {
if (state.forceBool(*iter->value, iter->pos)) { if (state.forceBool(*iter->value, iter->pos, "while evaluating the `allOutputs` attribute of a string context")) {
if (!isDerivation(name)) { if (!isDerivation(name)) {
throw EvalError({ throw EvalError({
.msg = hintfmt("Tried to add all-outputs context of %s, which is not a derivation, to a string", name), .msg = hintfmt("tried to add all-outputs context of %s, which is not a derivation, to a string", name),
.errPos = state.positions[i.pos] .errPos = state.positions[i.pos]
}); });
} }
@ -169,15 +167,15 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
iter = i.value->attrs->find(state.sOutputs); iter = i.value->attrs->find(state.sOutputs);
if (iter != i.value->attrs->end()) { if (iter != i.value->attrs->end()) {
state.forceList(*iter->value, iter->pos); state.forceList(*iter->value, iter->pos, "while evaluating the `outputs` attribute of a string context");
if (iter->value->listSize() && !isDerivation(name)) { if (iter->value->listSize() && !isDerivation(name)) {
throw EvalError({ throw EvalError({
.msg = hintfmt("Tried to add derivation output context of %s, which is not a derivation, to a string", name), .msg = hintfmt("tried to add derivation output context of %s, which is not a derivation, to a string", name),
.errPos = state.positions[i.pos] .errPos = state.positions[i.pos]
}); });
} }
for (auto elem : iter->value->listItems()) { for (auto elem : iter->value->listItems()) {
auto outputName = state.forceStringNoCtx(*elem, iter->pos); auto outputName = state.forceStringNoCtx(*elem, iter->pos, "while evaluating an output name within a string context");
context.insert(concatStrings("!", outputName, "!", name)); context.insert(concatStrings("!", outputName, "!", name));
} }
} }

11
src/libexpr/primops/fetchClosure.cc
View file

@ -7,7 +7,7 @@ namespace nix {
static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * args, Value & v) static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{ {
state.forceAttrs(*args[0], pos); state.forceAttrs(*args[0], pos, "while evaluating the argument passed to builtins.fetchClosure");
std::optional<std::string> fromStoreUrl; std::optional<std::string> fromStoreUrl;
std::optional<StorePath> fromPath; std::optional<StorePath> fromPath;
@ -19,7 +19,8 @@ static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * arg
if (attrName == "fromPath") { if (attrName == "fromPath") {
PathSet context; PathSet context;
fromPath = state.coerceToStorePath(attr.pos, *attr.value, context); fromPath = state.coerceToStorePath(attr.pos, *attr.value, context,
"while evaluating the 'fromPath' attribute passed to builtins.fetchClosure");
} }
else if (attrName == "toPath") { else if (attrName == "toPath") {
@ -27,12 +28,14 @@ static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * arg
toCA = true; toCA = true;
if (attr.value->type() != nString || attr.value->string.s != std::string("")) { if (attr.value->type() != nString || attr.value->string.s != std::string("")) {
PathSet context; PathSet context;
toPath = state.coerceToStorePath(attr.pos, *attr.value, context); toPath = state.coerceToStorePath(attr.pos, *attr.value, context,
"while evaluating the 'toPath' attribute passed to builtins.fetchClosure");
} }
} }
else if (attrName == "fromStore") else if (attrName == "fromStore")
fromStoreUrl = state.forceStringNoCtx(*attr.value, attr.pos); fromStoreUrl = state.forceStringNoCtx(*attr.value, attr.pos,
"while evaluating the 'fromStore' attribute passed to builtins.fetchClosure");
else else
throw Error({ throw Error({

14
src/libexpr/primops/fetchMercurial.cc
View file

@ -19,23 +19,23 @@ static void prim_fetchMercurial(EvalState & state, const PosIdx pos, Value * * a
if (args[0]->type() == nAttrs) { if (args[0]->type() == nAttrs) {
state.forceAttrs(*args[0], pos);
for (auto & attr : *args[0]->attrs) { for (auto & attr : *args[0]->attrs) {
std::string_view n(state.symbols[attr.name]); std::string_view n(state.symbols[attr.name]);
if (n == "url") if (n == "url")
url = state.coerceToString(attr.pos, *attr.value, context, false, false).toOwned(); url = state.coerceToString(attr.pos, *attr.value, context,
"while evaluating the `url` attribute passed to builtins.fetchMercurial",
false, false).toOwned();
else if (n == "rev") { else if (n == "rev") {
// Ugly: unlike fetchGit, here the "rev" attribute can // Ugly: unlike fetchGit, here the "rev" attribute can
// be both a revision or a branch/tag name. // be both a revision or a branch/tag name.
auto value = state.forceStringNoCtx(*attr.value, attr.pos); auto value = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the `rev` attribute passed to builtins.fetchMercurial");
if (std::regex_match(value.begin(), value.end(), revRegex)) if (std::regex_match(value.begin(), value.end(), revRegex))
rev = Hash::parseAny(value, htSHA1); rev = Hash::parseAny(value, htSHA1);
else else
ref = value; ref = value;
} }
else if (n == "name") else if (n == "name")
name = state.forceStringNoCtx(*attr.value, attr.pos); name = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the `name` attribute passed to builtins.fetchMercurial");
else else
throw EvalError({ throw EvalError({
.msg = hintfmt("unsupported argument '%s' to 'fetchMercurial'", state.symbols[attr.name]), .msg = hintfmt("unsupported argument '%s' to 'fetchMercurial'", state.symbols[attr.name]),
@ -50,7 +50,9 @@ static void prim_fetchMercurial(EvalState & state, const PosIdx pos, Value * * a
}); });
} else } else
url = state.coerceToString(pos, *args[0], context, false, false).toOwned(); url = state.coerceToString(pos, *args[0], context,
"while evaluating the first argument passed to builtins.fetchMercurial",
false, false).toOwned();
// FIXME: git externals probably can be used to bypass the URI // FIXME: git externals probably can be used to bypass the URI
// whitelist. Ah well. // whitelist. Ah well.

20
src/libexpr/primops/fetchTree.cc
View file

@ -102,7 +102,7 @@ static void fetchTree(
state.forceValue(*args[0], pos); state.forceValue(*args[0], pos);
if (args[0]->type() == nAttrs) { if (args[0]->type() == nAttrs) {
state.forceAttrs(*args[0], pos); state.forceAttrs(*args[0], pos, "while evaluating the argument passed to builtins.fetchTree");
fetchers::Attrs attrs; fetchers::Attrs attrs;
@ -112,7 +112,7 @@ static void fetchTree(
.msg = hintfmt("unexpected attribute 'type'"), .msg = hintfmt("unexpected attribute 'type'"),
.errPos = state.positions[pos] .errPos = state.positions[pos]
})); }));
type = state.forceStringNoCtx(*aType->value, aType->pos); type = state.forceStringNoCtx(*aType->value, aType->pos, "while evaluating the `type` attribute passed to builtins.fetchTree");
} else if (!type) } else if (!type)
state.debugThrowLastTrace(EvalError({ state.debugThrowLastTrace(EvalError({
.msg = hintfmt("attribute 'type' is missing in call to 'fetchTree'"), .msg = hintfmt("attribute 'type' is missing in call to 'fetchTree'"),
@ -125,7 +125,7 @@ static void fetchTree(
if (attr.name == state.sType) continue; if (attr.name == state.sType) continue;
state.forceValue(*attr.value, attr.pos); state.forceValue(*attr.value, attr.pos);
if (attr.value->type() == nPath || attr.value->type() == nString) { if (attr.value->type() == nPath || attr.value->type() == nString) {
auto s = state.coerceToString(attr.pos, *attr.value, context, false, false).toOwned(); auto s = state.coerceToString(attr.pos, *attr.value, context, "", false, false).toOwned();
attrs.emplace(state.symbols[attr.name], attrs.emplace(state.symbols[attr.name],
state.symbols[attr.name] == "url" state.symbols[attr.name] == "url"
? type == "git" ? type == "git"
@ -151,7 +151,9 @@ static void fetchTree(
input = fetchers::Input::fromAttrs(std::move(attrs)); input = fetchers::Input::fromAttrs(std::move(attrs));
} else { } else {
auto url = state.coerceToString(pos, *args[0], context, false, false).toOwned(); auto url = state.coerceToString(pos, *args[0], context,
"while evaluating the first argument passed to the fetcher",
false, false).toOwned();
if (type == "git") { if (type == "git") {
fetchers::Attrs attrs; fetchers::Attrs attrs;
@ -195,16 +197,14 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
if (args[0]->type() == nAttrs) { if (args[0]->type() == nAttrs) {
state.forceAttrs(*args[0], pos);
for (auto & attr : *args[0]->attrs) { for (auto & attr : *args[0]->attrs) {
std::string_view n(state.symbols[attr.name]); std::string_view n(state.symbols[attr.name]);
if (n == "url") if (n == "url")
url = state.forceStringNoCtx(*attr.value, attr.pos); url = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the url we should fetch");
else if (n == "sha256") else if (n == "sha256")
expectedHash = newHashAllowEmpty(state.forceStringNoCtx(*attr.value, attr.pos), htSHA256); expectedHash = newHashAllowEmpty(state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the sha256 of the content we should fetch"), htSHA256);
else if (n == "name") else if (n == "name")
name = state.forceStringNoCtx(*attr.value, attr.pos); name = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the name of the content we should fetch");
else else
state.debugThrowLastTrace(EvalError({ state.debugThrowLastTrace(EvalError({
.msg = hintfmt("unsupported argument '%s' to '%s'", n, who), .msg = hintfmt("unsupported argument '%s' to '%s'", n, who),
@ -218,7 +218,7 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
.errPos = state.positions[pos] .errPos = state.positions[pos]
})); }));
} else } else
url = state.forceStringNoCtx(*args[0], pos); url = state.forceStringNoCtx(*args[0], pos, "while evaluating the url we should fetch");
if (who == "fetchTarball") if (who == "fetchTarball")
url = evalSettings.resolvePseudoUrl(*url); url = evalSettings.resolvePseudoUrl(*url);

2
src/libexpr/primops/fromTOML.cc
View file

@ -7,7 +7,7 @@ namespace nix {
static void prim_fromTOML(EvalState & state, const PosIdx pos, Value * * args, Value & val) static void prim_fromTOML(EvalState & state, const PosIdx pos, Value * * args, Value & val)
{ {
auto toml = state.forceStringNoCtx(*args[0], pos); auto toml = state.forceStringNoCtx(*args[0], pos, "while evaluating the argument passed to builtins.fromTOML");
std::istringstream tomlStream(std::string{toml}); std::istringstream tomlStream(std::string{toml});

1298
src/libexpr/tests/error_traces.cc Normal file
View file

File diff suppressed because it is too large Load diff

6
src/libexpr/tests/primops.cc
View file

@ -823,4 +823,10 @@ namespace nix {
for (const auto [n, elem] : enumerate(v.listItems())) for (const auto [n, elem] : enumerate(v.listItems()))
ASSERT_THAT(*elem, IsStringEq(expected[n])); ASSERT_THAT(*elem, IsStringEq(expected[n]));
} }
TEST_F(PrimOpTest, genericClosure_not_strict) {
// Operator should not be used when startSet is empty
auto v = eval("builtins.genericClosure { startSet = []; }");
ASSERT_THAT(v, IsListOfSize(0));
}
} /* namespace nix */ } /* namespace nix */

2
src/libmain/shared.cc
View file

@ -407,8 +407,6 @@ int handleExceptions(const std::string & programName, std::function<void()> fun)
return 1; return 1;
} catch (BaseError & e) { } catch (BaseError & e) {
logError(e.info()); logError(e.info());
if (e.hasTrace() && !loggerSettings.showTrace.get())
printError("(use '--show-trace' to show detailed location information)");
return e.status; return e.status;
} catch (std::bad_alloc & e) { } catch (std::bad_alloc & e) {
printError(error + "out of memory"); printError(error + "out of memory");

1
src/libstore/derivations.hh
View file

@ -13,6 +13,7 @@
namespace nix { namespace nix {
class Store;
/* Abstract syntax of derivations. */ /* Abstract syntax of derivations. */

17
src/libstore/outputs-spec.cc
View file

@ -1,8 +1,10 @@
#include "util.hh"
#include "outputs-spec.hh"
#include "nlohmann/json.hpp"
#include <regex> #include <regex>
#include <nlohmann/json.hpp>
#include "util.hh"
#include "regex-combinators.hh"
#include "outputs-spec.hh"
#include "path-regex.hh"
namespace nix { namespace nix {
@ -18,11 +20,14 @@ bool OutputsSpec::contains(const std::string & outputName) const
}, raw()); }, raw());
} }
static std::string outputSpecRegexStr =
regex::either(
regex::group(R"(\*)"),
regex::group(regex::list(nameRegexStr)));
std::optional<OutputsSpec> OutputsSpec::parseOpt(std::string_view s) std::optional<OutputsSpec> OutputsSpec::parseOpt(std::string_view s)
{ {
// See checkName() for valid output name characters. static std::regex regex(std::string { outputSpecRegexStr });
static std::regex regex(R"((\*)|([a-zA-Z\+\-\._\?=]+(,[a-zA-Z\+\-\._\?=]+)*))");
std::smatch match; std::smatch match;
std::string s2 { s }; // until some improves std::regex std::string s2 { s }; // until some improves std::regex

7
src/libstore/path-regex.hh Normal file
View file

@ -0,0 +1,7 @@
#pragma once
namespace nix {
static constexpr std::string_view nameRegexStr = R"([0-9a-zA-Z\+\-\._\?=]+)";
}

6
src/libstore/path.cc
View file

@ -8,8 +8,10 @@ static void checkName(std::string_view path, std::string_view name)
{ {
if (name.empty()) if (name.empty())
throw BadStorePath("store path '%s' has an empty name", path); throw BadStorePath("store path '%s' has an empty name", path);
if (name.size() > 211) if (name.size() > StorePath::MaxPathLen)
throw BadStorePath("store path '%s' has a name longer than 211 characters", path); throw BadStorePath("store path '%s' has a name longer than '%d characters",
StorePath::MaxPathLen, path);
// See nameRegexStr for the definition
for (auto c : name) for (auto c : name)
if (!((c >= '0' && c <= '9') if (!((c >= '0' && c <= '9')
|| (c >= 'a' && c <= 'z') || (c >= 'a' && c <= 'z')

3
src/libstore/path.hh
View file

@ -5,7 +5,6 @@
namespace nix { namespace nix {
class Store;
struct Hash; struct Hash;
class StorePath class StorePath
@ -17,6 +16,8 @@ public:
/* Size of the hash part of store paths, in base-32 characters. */ /* Size of the hash part of store paths, in base-32 characters. */
constexpr static size_t HashLen = 32; // i.e. 160 bits constexpr static size_t HashLen = 32; // i.e. 160 bits
constexpr static size_t MaxPathLen = 211;
StorePath() = delete; StorePath() = delete;
StorePath(std::string_view baseName); StorePath(std::string_view baseName);

2
src/libstore/realisation.hh
View file

@ -7,6 +7,8 @@
namespace nix { namespace nix {
class Store;
struct DrvOutput { struct DrvOutput {
// The hash modulo of the derivation // The hash modulo of the derivation
Hash drvHash; Hash drvHash;

23
src/libstore/tests/libstoretests.hh Normal file
View file

@ -0,0 +1,23 @@
#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include "store-api.hh"
namespace nix {
class LibStoreTest : public ::testing::Test {
public:
static void SetUpTestSuite() {
initLibStore();
}
protected:
LibStoreTest()
: store(openStore("dummy://"))
{ }
ref<Store> store;
};
} /* namespace nix */

2
src/libstore/tests/local.mk
View file

@ -12,4 +12,4 @@ libstore-tests_CXXFLAGS += -I src/libstore -I src/libutil
libstore-tests_LIBS = libstore libutil libstore-tests_LIBS = libstore libutil
libstore-tests_LDFLAGS := $(GTEST_LIBS) libstore-tests_LDFLAGS := -lrapidcheck $(GTEST_LIBS)

7
src/libstore/tests/outputs-spec.cc
View file

@ -47,6 +47,13 @@ TEST(OutputsSpec, names_underscore) {
ASSERT_EQ(expected.to_string(), str); ASSERT_EQ(expected.to_string(), str);
} }
TEST(OutputsSpec, names_numberic) {
std::string_view str = "01";
OutputsSpec expected = OutputsSpec::Names { "01" };
ASSERT_EQ(OutputsSpec::parse(str), expected);
ASSERT_EQ(expected.to_string(), str);
}
TEST(OutputsSpec, names_out_bin) { TEST(OutputsSpec, names_out_bin) {
OutputsSpec expected = OutputsSpec::Names { "out", "bin" }; OutputsSpec expected = OutputsSpec::Names { "out", "bin" };
ASSERT_EQ(OutputsSpec::parse("out,bin"), expected); ASSERT_EQ(OutputsSpec::parse("out,bin"), expected);

144
src/libstore/tests/path.cc Normal file
View file

@ -0,0 +1,144 @@
#include <regex>
#include <nlohmann/json.hpp>
#include <gtest/gtest.h>
#include <rapidcheck/gtest.h>
#include "path-regex.hh"
#include "store-api.hh"
#include "libstoretests.hh"
namespace nix {
#define STORE_DIR "/nix/store/"
#define HASH_PART "g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q"
class StorePathTest : public LibStoreTest
{
};
static std::regex nameRegex { std::string { nameRegexStr } };
#define TEST_DONT_PARSE(NAME, STR) \
TEST_F(StorePathTest, bad_ ## NAME) { \
std::string_view str = \
STORE_DIR HASH_PART "-" STR; \
ASSERT_THROW( \
store->parseStorePath(str), \
BadStorePath); \
std::string name { STR }; \
EXPECT_FALSE(std::regex_match(name, nameRegex)); \
}
TEST_DONT_PARSE(empty, "")
TEST_DONT_PARSE(garbage, "&*()")
TEST_DONT_PARSE(double_star, "**")
TEST_DONT_PARSE(star_first, "*,foo")
TEST_DONT_PARSE(star_second, "foo,*")
TEST_DONT_PARSE(bang, "foo!o")
#undef TEST_DONT_PARSE
#define TEST_DO_PARSE(NAME, STR) \
TEST_F(StorePathTest, good_ ## NAME) { \
std::string_view str = \
STORE_DIR HASH_PART "-" STR; \
auto p = store->parseStorePath(str); \
std::string name { p.name() }; \
EXPECT_TRUE(std::regex_match(name, nameRegex)); \
}
// 0-9 a-z A-Z + - . _ ? =
TEST_DO_PARSE(numbers, "02345")
TEST_DO_PARSE(lower_case, "foo")
TEST_DO_PARSE(upper_case, "FOO")
TEST_DO_PARSE(plus, "foo+bar")
TEST_DO_PARSE(dash, "foo-dev")
TEST_DO_PARSE(underscore, "foo_bar")
TEST_DO_PARSE(period, "foo.txt")
TEST_DO_PARSE(question_mark, "foo?why")
TEST_DO_PARSE(equals_sign, "foo=foo")
#undef TEST_DO_PARSE
// For rapidcheck
void showValue(const StorePath & p, std::ostream & os) {
os << p.to_string();
}
}
namespace rc {
using namespace nix;
template<>
struct Arbitrary<StorePath> {
static Gen<StorePath> arbitrary();
};
Gen<StorePath> Arbitrary<StorePath>::arbitrary()
{
auto len = *gen::inRange<size_t>(1, StorePath::MaxPathLen);
std::string pre { HASH_PART "-" };
pre.reserve(pre.size() + len);
for (size_t c = 0; c < len; ++c) {
switch (auto i = *gen::inRange<uint8_t>(0, 10 + 2 * 26 + 6)) {
case 0 ... 9:
pre += '0' + i;
case 10 ... 35:
pre += 'A' + (i - 10);
break;
case 36 ... 61:
pre += 'a' + (i - 36);
break;
case 62:
pre += '+';
break;
case 63:
pre += '-';
break;
case 64:
pre += '.';
break;
case 65:
pre += '_';
break;
case 66:
pre += '?';
break;
case 67:
pre += '=';
break;
default:
assert(false);
}
}
return gen::just(StorePath { pre });
}
} // namespace rc
namespace nix {
RC_GTEST_FIXTURE_PROP(
StorePathTest,
prop_regex_accept,
(const StorePath & p))
{
RC_ASSERT(std::regex_match(std::string { p.name() }, nameRegex));
}
RC_GTEST_FIXTURE_PROP(
StorePathTest,
prop_round_rip,
(const StorePath & p))
{
RC_ASSERT(p == store->parseStorePath(store->printStorePath(p)));
}
}

122
src/libutil/error.cc
View file

@ -9,9 +9,9 @@ namespace nix {
const std::string nativeSystem = SYSTEM; const std::string nativeSystem = SYSTEM;
void BaseError::addTrace(std::shared_ptr<AbstractPos> && e, hintformat hint) void BaseError::addTrace(std::shared_ptr<AbstractPos> && e, hintformat hint, bool frame)
{ {
err.traces.push_front(Trace { .pos = std::move(e), .hint = hint }); err.traces.push_front(Trace { .pos = std::move(e), .hint = hint, .frame = frame });
} }
// c++ std::exception descendants must have a 'const char* what()' function. // c++ std::exception descendants must have a 'const char* what()' function.
@ -200,13 +200,125 @@ std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool s
auto noSource = ANSI_ITALIC " (source not available)" ANSI_NORMAL "\n"; auto noSource = ANSI_ITALIC " (source not available)" ANSI_NORMAL "\n";
// traces /*
if (showTrace && !einfo.traces.empty()) { * Traces
* ------
*
* The semantics of traces is a bit weird. We have only one option to
* print them and to make them verbose (--show-trace). In the code they
* are always collected, but they are not printed by default. The code
* also collects more traces when the option is on. This means that there
* is no way to print the simplified traces at all.
*
* I (layus) designed the code to attach positions to a restricted set of
* messages. This means that we have a lot of traces with no position at
* all, including most of the base error messages. For example "type
* error: found a string while a set was expected" has no position, but
* will come with several traces detailing it's precise relation to the
* closest know position. This makes erroring without printing traces
* quite useless.
*
* This is why I introduced the idea to always print a few traces on
* error. The number 3 is quite arbitrary, and was selected so as not to
* clutter the console on error. For the same reason, a trace with an
* error position takes more space, and counts as two traces towards the
* limit.
*
* The rest is truncated, unless --show-trace is passed. This preserves
* the same bad semantics of --show-trace to both show the trace and
* augment it with new data. Not too sure what is the best course of
* action.
*
* The issue is that it is fundamentally hard to provide a trace for a
* lazy language. The trace will only cover the current spine of the
* evaluation, missing things that have been evaluated before. For
* example, most type errors are hard to inspect because there is not
* trace for the faulty value. These errors should really print the faulty
* value itself.
*
* In function calls, the --show-trace flag triggers extra traces for each
* function invocation. These work as scopes, allowing to follow the
* current spine of the evaluation graph. Without that flag, the error
* trace should restrict itself to a restricted prefix of that trace,
* until the first scope. If we ever get to such a precise error
* reporting, there would be no need to add an arbitrary limit here. We
* could always print the full trace, and it would just be small without
* the flag.
*
* One idea I had is for XxxError.addTrace() to perform nothing if one
* scope has already been traced. Alternatively, we could stop here when
* we encounter such a scope instead of after an arbitrary number of
* traces. This however requires to augment traces with the notion of
* "scope".
*
* This is particularly visible in code like evalAttrs(...) where we have
* to make a decision between the two following options.
*
* ``` long traces
* inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const Pos & pos, std::string_view errorCtx)
* {
* try {
* e->eval(*this, env, v);
* if (v.type() != nAttrs)
* throwTypeError("value is %1% while a set was expected", v);
* } catch (Error & e) {
* e.addTrace(pos, errorCtx);
* throw;
* }
* }
* ```
*
* ``` short traces
* inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const Pos & pos, std::string_view errorCtx)
* {
* e->eval(*this, env, v);
* try {
* if (v.type() != nAttrs)
* throwTypeError("value is %1% while a set was expected", v);
* } catch (Error & e) {
* e.addTrace(pos, errorCtx);
* throw;
* }
* }
* ```
*
* The second example can be rewritten more concisely, but kept in this
* form to highlight the symmetry. The first option adds more information,
* because whatever caused an error down the line, in the generic eval
* function, will get annotated with the code location that uses and
* required it. The second option is less verbose, but does not provide
* any context at all as to where and why a failing value was required.
*
* Scopes would fix that, by adding context only when --show-trace is
* passed, and keeping the trace terse otherwise.
*
*/
// Enough indent to align with with the `... `
// prepended to each element of the trace
auto ellipsisIndent = " ";
bool frameOnly = false;
if (!einfo.traces.empty()) {
size_t count = 0;
for (const auto & trace : einfo.traces) { for (const auto & trace : einfo.traces) {
if (!showTrace && count > 3) {
oss << "\n" << ANSI_WARNING "(stack trace truncated; use '--show-trace' to show the full trace)" ANSI_NORMAL << "\n";
break;
}
if (trace.hint.str().empty()) continue;
if (frameOnly && !trace.frame) continue;
count++;
frameOnly = trace.frame;
oss << "\n" << "… " << trace.hint.str() << "\n"; oss << "\n" << "… " << trace.hint.str() << "\n";
if (trace.pos) { if (trace.pos) {
oss << "\n" << ANSI_BLUE << "at " ANSI_WARNING << *trace.pos << ANSI_NORMAL << ":"; count++;
oss << "\n" << ellipsisIndent << ANSI_BLUE << "at " ANSI_WARNING << *trace.pos << ANSI_NORMAL << ":";
if (auto loc = trace.pos->getCodeLines()) { if (auto loc = trace.pos->getCodeLines()) {
oss << "\n"; oss << "\n";

20
src/libutil/error.hh
View file

@ -74,6 +74,8 @@ struct AbstractPos
virtual void print(std::ostream & out) const = 0; virtual void print(std::ostream & out) const = 0;
std::optional<LinesOfCode> getCodeLines() const; std::optional<LinesOfCode> getCodeLines() const;
virtual ~AbstractPos() = default;
}; };
std::ostream & operator << (std::ostream & str, const AbstractPos & pos); std::ostream & operator << (std::ostream & str, const AbstractPos & pos);
@ -86,6 +88,7 @@ void printCodeLines(std::ostream & out,
struct Trace { struct Trace {
std::shared_ptr<AbstractPos> pos; std::shared_ptr<AbstractPos> pos;
hintformat hint; hintformat hint;
bool frame;
}; };
struct ErrorInfo { struct ErrorInfo {
@ -114,6 +117,8 @@ protected:
public: public:
unsigned int status = 1; // exit status unsigned int status = 1; // exit status
BaseError(const BaseError &) = default;
template<typename... Args> template<typename... Args>
BaseError(unsigned int status, const Args & ... args) BaseError(unsigned int status, const Args & ... args)
: err { .level = lvlError, .msg = hintfmt(args...) } : err { .level = lvlError, .msg = hintfmt(args...) }
@ -152,15 +157,22 @@ public:
const std::string & msg() const { return calcWhat(); } const std::string & msg() const { return calcWhat(); }
const ErrorInfo & info() const { calcWhat(); return err; } const ErrorInfo & info() const { calcWhat(); return err; }
template<typename... Args> void pushTrace(Trace trace)
void addTrace(std::shared_ptr<AbstractPos> && e, const std::string & fs, const Args & ... args)
{ {
addTrace(std::move(e), hintfmt(fs, args...)); err.traces.push_front(trace);
} }
void addTrace(std::shared_ptr<AbstractPos> && e, hintformat hint); template<typename... Args>
void addTrace(std::shared_ptr<AbstractPos> && e, std::string_view fs, const Args & ... args)
{
addTrace(std::move(e), hintfmt(std::string(fs), args...));
}
void addTrace(std::shared_ptr<AbstractPos> && e, hintformat hint, bool frame = false);
bool hasTrace() const { return !err.traces.empty(); } bool hasTrace() const { return !err.traces.empty(); }
const ErrorInfo & info() { return err; };
}; };
#define MakeError(newClass, superClass) \ #define MakeError(newClass, superClass) \

30
src/libutil/regex-combinators.hh Normal file
View file

@ -0,0 +1,30 @@
#pragma once
#include <string_view>
namespace nix::regex {
// TODO use constexpr string building like
// https://github.com/akrzemi1/static_string/blob/master/include/ak_toolkit/static_string.hpp
static inline std::string either(std::string_view a, std::string_view b)
{
return std::string { a } + "|" + b;
}
static inline std::string group(std::string_view a)
{
return std::string { "(" } + a + ")";
}
static inline std::string many(std::string_view a)
{
return std::string { "(?:" } + a + ")*";
}
static inline std::string list(std::string_view a)
{
return std::string { a } + many(group("," + a));
}
}

4
src/nix-env/user-env.cc
View file

@ -134,9 +134,9 @@ bool createUserEnv(EvalState & state, DrvInfos & elems,
state.forceValue(topLevel, [&]() { return topLevel.determinePos(noPos); }); state.forceValue(topLevel, [&]() { return topLevel.determinePos(noPos); });
PathSet context; PathSet context;
Attr & aDrvPath(*topLevel.attrs->find(state.sDrvPath)); Attr & aDrvPath(*topLevel.attrs->find(state.sDrvPath));
auto topLevelDrv = state.coerceToStorePath(aDrvPath.pos, *aDrvPath.value, context); auto topLevelDrv = state.coerceToStorePath(aDrvPath.pos, *aDrvPath.value, context, "");
Attr & aOutPath(*topLevel.attrs->find(state.sOutPath)); Attr & aOutPath(*topLevel.attrs->find(state.sOutPath));
auto topLevelOut = state.coerceToStorePath(aOutPath.pos, *aOutPath.value, context); auto topLevelOut = state.coerceToStorePath(aOutPath.pos, *aOutPath.value, context, "");
/* Realise the resulting store expression. */ /* Realise the resulting store expression. */
debug("building user environment"); debug("building user environment");

6
src/nix/bundle.cc
View file

@ -97,13 +97,13 @@ struct CmdBundle : InstallableCommand
throw Error("the bundler '%s' does not produce a derivation", bundler.what()); throw Error("the bundler '%s' does not produce a derivation", bundler.what());
PathSet context2; PathSet context2;
auto drvPath = evalState->coerceToStorePath(attr1->pos, *attr1->value, context2); auto drvPath = evalState->coerceToStorePath(attr1->pos, *attr1->value, context2, "");
auto attr2 = vRes->attrs->get(evalState->sOutPath); auto attr2 = vRes->attrs->get(evalState->sOutPath);
if (!attr2) if (!attr2)
throw Error("the bundler '%s' does not produce a derivation", bundler.what()); throw Error("the bundler '%s' does not produce a derivation", bundler.what());
auto outPath = evalState->coerceToStorePath(attr2->pos, *attr2->value, context2); auto outPath = evalState->coerceToStorePath(attr2->pos, *attr2->value, context2, "");
store->buildPaths({ store->buildPaths({
DerivedPath::Built { DerivedPath::Built {
@ -118,7 +118,7 @@ struct CmdBundle : InstallableCommand
auto * attr = vRes->attrs->get(evalState->sName); auto * attr = vRes->attrs->get(evalState->sName);
if (!attr) if (!attr)
throw Error("attribute 'name' missing"); throw Error("attribute 'name' missing");
outLink = evalState->forceStringNoCtx(*attr->value, attr->pos); outLink = evalState->forceStringNoCtx(*attr->value, attr->pos, "");
} }
// TODO: will crash if not a localFSStore? // TODO: will crash if not a localFSStore?

2
src/nix/eval.cc
View file

@ -112,7 +112,7 @@ struct CmdEval : MixJSON, InstallableCommand
else if (raw) { else if (raw) {
stopProgressBar(); stopProgressBar();
std::cout << *state->coerceToString(noPos, *v, context); std::cout << *state->coerceToString(noPos, *v, context, "while generating the eval command output");
} }
else if (json) { else if (json) {

50
src/nix/flake.cc
View file

@ -126,12 +126,12 @@ static void enumerateOutputs(EvalState & state, Value & vFlake,
std::function<void(const std::string & name, Value & vProvide, const PosIdx pos)> callback) std::function<void(const std::string & name, Value & vProvide, const PosIdx pos)> callback)
{ {
auto pos = vFlake.determinePos(noPos); auto pos = vFlake.determinePos(noPos);
state.forceAttrs(vFlake, pos); state.forceAttrs(vFlake, pos, "while evaluating a flake to get its outputs");
auto aOutputs = vFlake.attrs->get(state.symbols.create("outputs")); auto aOutputs = vFlake.attrs->get(state.symbols.create("outputs"));
assert(aOutputs); assert(aOutputs);
state.forceAttrs(*aOutputs->value, pos); state.forceAttrs(*aOutputs->value, pos, "while evaluating the outputs of a flake");
auto sHydraJobs = state.symbols.create("hydraJobs"); auto sHydraJobs = state.symbols.create("hydraJobs");
@ -391,13 +391,13 @@ struct CmdFlakeCheck : FlakeCommand
checkHydraJobs = [&](const std::string & attrPath, Value & v, const PosIdx pos) { checkHydraJobs = [&](const std::string & attrPath, Value & v, const PosIdx pos) {
try { try {
state->forceAttrs(v, pos); state->forceAttrs(v, pos, "");
if (state->isDerivation(v)) if (state->isDerivation(v))
throw Error("jobset should not be a derivation at top-level"); throw Error("jobset should not be a derivation at top-level");
for (auto & attr : *v.attrs) { for (auto & attr : *v.attrs) {
state->forceAttrs(*attr.value, attr.pos); state->forceAttrs(*attr.value, attr.pos, "");
auto attrPath2 = concatStrings(attrPath, ".", state->symbols[attr.name]); auto attrPath2 = concatStrings(attrPath, ".", state->symbols[attr.name]);
if (state->isDerivation(*attr.value)) { if (state->isDerivation(*attr.value)) {
Activity act(*logger, lvlChatty, actUnknown, Activity act(*logger, lvlChatty, actUnknown,
@ -419,7 +419,7 @@ struct CmdFlakeCheck : FlakeCommand
fmt("checking NixOS configuration '%s'", attrPath)); fmt("checking NixOS configuration '%s'", attrPath));
Bindings & bindings(*state->allocBindings(0)); Bindings & bindings(*state->allocBindings(0));
auto vToplevel = findAlongAttrPath(*state, "config.system.build.toplevel", bindings, v).first; auto vToplevel = findAlongAttrPath(*state, "config.system.build.toplevel", bindings, v).first;
state->forceAttrs(*vToplevel, pos); state->forceValue(*vToplevel, pos);
if (!state->isDerivation(*vToplevel)) if (!state->isDerivation(*vToplevel))
throw Error("attribute 'config.system.build.toplevel' is not a derivation"); throw Error("attribute 'config.system.build.toplevel' is not a derivation");
} catch (Error & e) { } catch (Error & e) {
@ -433,12 +433,12 @@ struct CmdFlakeCheck : FlakeCommand
Activity act(*logger, lvlChatty, actUnknown, Activity act(*logger, lvlChatty, actUnknown,
fmt("checking template '%s'", attrPath)); fmt("checking template '%s'", attrPath));
state->forceAttrs(v, pos); state->forceAttrs(v, pos, "");
if (auto attr = v.attrs->get(state->symbols.create("path"))) { if (auto attr = v.attrs->get(state->symbols.create("path"))) {
if (attr->name == state->symbols.create("path")) { if (attr->name == state->symbols.create("path")) {
PathSet context; PathSet context;
auto path = state->coerceToPath(attr->pos, *attr->value, context); auto path = state->coerceToPath(attr->pos, *attr->value, context, "");
if (!store->isInStore(path)) if (!store->isInStore(path))
throw Error("template '%s' has a bad 'path' attribute"); throw Error("template '%s' has a bad 'path' attribute");
// TODO: recursively check the flake in 'path'. // TODO: recursively check the flake in 'path'.
@ -447,7 +447,7 @@ struct CmdFlakeCheck : FlakeCommand
throw Error("template '%s' lacks attribute 'path'", attrPath); throw Error("template '%s' lacks attribute 'path'", attrPath);
if (auto attr = v.attrs->get(state->symbols.create("description"))) if (auto attr = v.attrs->get(state->symbols.create("description")))
state->forceStringNoCtx(*attr->value, attr->pos); state->forceStringNoCtx(*attr->value, attr->pos, "");
else else
throw Error("template '%s' lacks attribute 'description'", attrPath); throw Error("template '%s' lacks attribute 'description'", attrPath);
@ -504,11 +504,11 @@ struct CmdFlakeCheck : FlakeCommand
warn("flake output attribute '%s' is deprecated; use '%s' instead", name, replacement); warn("flake output attribute '%s' is deprecated; use '%s' instead", name, replacement);
if (name == "checks") { if (name == "checks") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
state->forceAttrs(*attr.value, attr.pos); state->forceAttrs(*attr.value, attr.pos, "");
for (auto & attr2 : *attr.value->attrs) { for (auto & attr2 : *attr.value->attrs) {
auto drvPath = checkDerivation( auto drvPath = checkDerivation(
fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]), fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]),
@ -524,7 +524,7 @@ struct CmdFlakeCheck : FlakeCommand
} }
else if (name == "formatter") { else if (name == "formatter") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
@ -535,11 +535,11 @@ struct CmdFlakeCheck : FlakeCommand
} }
else if (name == "packages" || name == "devShells") { else if (name == "packages" || name == "devShells") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
state->forceAttrs(*attr.value, attr.pos); state->forceAttrs(*attr.value, attr.pos, "");
for (auto & attr2 : *attr.value->attrs) for (auto & attr2 : *attr.value->attrs)
checkDerivation( checkDerivation(
fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]), fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]),
@ -548,11 +548,11 @@ struct CmdFlakeCheck : FlakeCommand
} }
else if (name == "apps") { else if (name == "apps") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
state->forceAttrs(*attr.value, attr.pos); state->forceAttrs(*attr.value, attr.pos, "");
for (auto & attr2 : *attr.value->attrs) for (auto & attr2 : *attr.value->attrs)
checkApp( checkApp(
fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]), fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]),
@ -561,7 +561,7 @@ struct CmdFlakeCheck : FlakeCommand
} }
else if (name == "defaultPackage" || name == "devShell") { else if (name == "defaultPackage" || name == "devShell") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
@ -572,7 +572,7 @@ struct CmdFlakeCheck : FlakeCommand
} }
else if (name == "defaultApp") { else if (name == "defaultApp") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
@ -583,7 +583,7 @@ struct CmdFlakeCheck : FlakeCommand
} }
else if (name == "legacyPackages") { else if (name == "legacyPackages") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
checkSystemName(state->symbols[attr.name], attr.pos); checkSystemName(state->symbols[attr.name], attr.pos);
// FIXME: do getDerivations? // FIXME: do getDerivations?
@ -594,7 +594,7 @@ struct CmdFlakeCheck : FlakeCommand
checkOverlay(name, vOutput, pos); checkOverlay(name, vOutput, pos);
else if (name == "overlays") { else if (name == "overlays") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) for (auto & attr : *vOutput.attrs)
checkOverlay(fmt("%s.%s", name, state->symbols[attr.name]), checkOverlay(fmt("%s.%s", name, state->symbols[attr.name]),
*attr.value, attr.pos); *attr.value, attr.pos);
@ -604,14 +604,14 @@ struct CmdFlakeCheck : FlakeCommand
checkModule(name, vOutput, pos); checkModule(name, vOutput, pos);
else if (name == "nixosModules") { else if (name == "nixosModules") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) for (auto & attr : *vOutput.attrs)
checkModule(fmt("%s.%s", name, state->symbols[attr.name]), checkModule(fmt("%s.%s", name, state->symbols[attr.name]),
*attr.value, attr.pos); *attr.value, attr.pos);
} }
else if (name == "nixosConfigurations") { else if (name == "nixosConfigurations") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) for (auto & attr : *vOutput.attrs)
checkNixOSConfiguration(fmt("%s.%s", name, state->symbols[attr.name]), checkNixOSConfiguration(fmt("%s.%s", name, state->symbols[attr.name]),
*attr.value, attr.pos); *attr.value, attr.pos);
@ -624,14 +624,14 @@ struct CmdFlakeCheck : FlakeCommand
checkTemplate(name, vOutput, pos); checkTemplate(name, vOutput, pos);
else if (name == "templates") { else if (name == "templates") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) for (auto & attr : *vOutput.attrs)
checkTemplate(fmt("%s.%s", name, state->symbols[attr.name]), checkTemplate(fmt("%s.%s", name, state->symbols[attr.name]),
*attr.value, attr.pos); *attr.value, attr.pos);
} }
else if (name == "defaultBundler") { else if (name == "defaultBundler") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
@ -642,11 +642,11 @@ struct CmdFlakeCheck : FlakeCommand
} }
else if (name == "bundlers") { else if (name == "bundlers") {
state->forceAttrs(vOutput, pos); state->forceAttrs(vOutput, pos, "");
for (auto & attr : *vOutput.attrs) { for (auto & attr : *vOutput.attrs) {
const auto & attr_name = state->symbols[attr.name]; const auto & attr_name = state->symbols[attr.name];
checkSystemName(attr_name, attr.pos); checkSystemName(attr_name, attr.pos);
state->forceAttrs(*attr.value, attr.pos); state->forceAttrs(*attr.value, attr.pos, "");
for (auto & attr2 : *attr.value->attrs) { for (auto & attr2 : *attr.value->attrs) {
checkBundler( checkBundler(
fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]), fmt("%s.%s.%s", name, attr_name, state->symbols[attr2.name]),

2
src/nix/main.cc
View file

@ -199,7 +199,7 @@ static void showHelp(std::vector<std::string> subcommand, MultiCommand & topleve
if (!attr) if (!attr)
throw UsageError("Nix has no subcommand '%s'", concatStringsSep("", subcommand)); throw UsageError("Nix has no subcommand '%s'", concatStringsSep("", subcommand));
auto markdown = state.forceString(*attr->value); auto markdown = state.forceString(*attr->value, noPos, "while evaluating the lowdown help text");
RunPager pager; RunPager pager;
std::cout << renderMarkdownToTerminal(markdown) << "\n"; std::cout << renderMarkdownToTerminal(markdown) << "\n";

16
src/nix/prefetch.cc
View file

@ -28,17 +28,17 @@ std::string resolveMirrorUrl(EvalState & state, const std::string & url)
Value vMirrors; Value vMirrors;
// FIXME: use nixpkgs flake // FIXME: use nixpkgs flake
state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors); state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors);
state.forceAttrs(vMirrors, noPos); state.forceAttrs(vMirrors, noPos, "while evaluating the set of all mirrors");
auto mirrorList = vMirrors.attrs->find(state.symbols.create(mirrorName)); auto mirrorList = vMirrors.attrs->find(state.symbols.create(mirrorName));
if (mirrorList == vMirrors.attrs->end()) if (mirrorList == vMirrors.attrs->end())
throw Error("unknown mirror name '%s'", mirrorName); throw Error("unknown mirror name '%s'", mirrorName);
state.forceList(*mirrorList->value, noPos); state.forceList(*mirrorList->value, noPos, "while evaluating one mirror configuration");
if (mirrorList->value->listSize() < 1) if (mirrorList->value->listSize() < 1)
throw Error("mirror URL '%s' did not expand to anything", url); throw Error("mirror URL '%s' did not expand to anything", url);
std::string mirror(state.forceString(*mirrorList->value->listElems()[0])); std::string mirror(state.forceString(*mirrorList->value->listElems()[0], noPos, "while evaluating the first available mirror"));
return mirror + (hasSuffix(mirror, "/") ? "" : "/") + s.substr(p + 1); return mirror + (hasSuffix(mirror, "/") ? "" : "/") + s.substr(p + 1);
} }
@ -196,29 +196,29 @@ static int main_nix_prefetch_url(int argc, char * * argv)
Value vRoot; Value vRoot;
state->evalFile(path, vRoot); state->evalFile(path, vRoot);
Value & v(*findAlongAttrPath(*state, attrPath, autoArgs, vRoot).first); Value & v(*findAlongAttrPath(*state, attrPath, autoArgs, vRoot).first);
state->forceAttrs(v, noPos); state->forceAttrs(v, noPos, "while evaluating the source attribute to prefetch");
/* Extract the URL. */ /* Extract the URL. */
auto * attr = v.attrs->get(state->symbols.create("urls")); auto * attr = v.attrs->get(state->symbols.create("urls"));
if (!attr) if (!attr)
throw Error("attribute 'urls' missing"); throw Error("attribute 'urls' missing");
state->forceList(*attr->value, noPos); state->forceList(*attr->value, noPos, "while evaluating the urls to prefetch");
if (attr->value->listSize() < 1) if (attr->value->listSize() < 1)
throw Error("'urls' list is empty"); throw Error("'urls' list is empty");
url = state->forceString(*attr->value->listElems()[0]); url = state->forceString(*attr->value->listElems()[0], noPos, "while evaluating the first url from the urls list");
/* Extract the hash mode. */ /* Extract the hash mode. */
auto attr2 = v.attrs->get(state->symbols.create("outputHashMode")); auto attr2 = v.attrs->get(state->symbols.create("outputHashMode"));
if (!attr2) if (!attr2)
printInfo("warning: this does not look like a fetchurl call"); printInfo("warning: this does not look like a fetchurl call");
else else
unpack = state->forceString(*attr2->value) == "recursive"; unpack = state->forceString(*attr2->value, noPos, "while evaluating the outputHashMode of the source to prefetch") == "recursive";
/* Extract the name. */ /* Extract the name. */
if (!name) { if (!name) {
auto attr3 = v.attrs->get(state->symbols.create("name")); auto attr3 = v.attrs->get(state->symbols.create("name"));
if (!attr3) if (!attr3)
name = state->forceString(*attr3->value); name = state->forceString(*attr3->value, noPos, "while evaluating the name of the source to prefetch");
} }
} }

31
src/nix/show-config.cc
View file

@ -9,15 +9,44 @@ using namespace nix;
struct CmdShowConfig : Command, MixJSON struct CmdShowConfig : Command, MixJSON
{ {
std::optional<std::string> name;
CmdShowConfig() {
expectArgs({
.label = {"name"},
.optional = true,
.handler = {&name},
});
}
std::string description() override std::string description() override
{ {
return "show the Nix configuration"; return "show the Nix configuration or the value of a specific setting";
} }
Category category() override { return catUtility; } Category category() override { return catUtility; }
void run() override void run() override
{ {
if (name) {
if (json) {
throw UsageError("'--json' is not supported when specifying a setting name");
}
std::map<std::string, Config::SettingInfo> settings;
globalConfig.getSettings(settings);
auto setting = settings.find(*name);
if (setting == settings.end()) {
throw Error("could not find setting '%1%'", *name);
} else {
const auto & value = setting->second.value;
logger->cout("%s", value);
}
return;
}
if (json) { if (json) {
// FIXME: use appropriate JSON types (bool, ints, etc). // FIXME: use appropriate JSON types (bool, ints, etc).
logger->cout("%s", globalConfig.toJSON().dump()); logger->cout("%s", globalConfig.toJSON().dump());

2
src/nix/upgrade-nix.cc
View file

@ -144,7 +144,7 @@ struct CmdUpgradeNix : MixDryRun, StoreCommand
Bindings & bindings(*state->allocBindings(0)); Bindings & bindings(*state->allocBindings(0));
auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v).first; auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v).first;
return store->parseStorePath(state->forceString(*v2)); return store->parseStorePath(state->forceString(*v2, noPos, "while evaluating the path tho latest nix version"));
} }
}; };

5
tests/config.sh
View file

@ -51,3 +51,8 @@ exp_features=$(nix show-config | grep '^experimental-features' | cut -d '=' -f 2
[[ $prev != $exp_cores ]] [[ $prev != $exp_cores ]]
[[ $exp_cores == "4242" ]] [[ $exp_cores == "4242" ]]
[[ $exp_features == "flakes nix-command" ]] [[ $exp_features == "flakes nix-command" ]]
# Test that it's possible to retrieve a single setting's value
val=$(nix show-config | grep '^warn-dirty' | cut -d '=' -f 2 | xargs)
val2=$(nix show-config warn-dirty)
[[ $val == $val2 ]]

2
tests/export-graph.sh
View file

@ -4,7 +4,7 @@ clearStore
clearProfiles clearProfiles
checkRef() { checkRef() {
nix-store -q --references $TEST_ROOT/result | grep -q "$1" || fail "missing reference $1" nix-store -q --references $TEST_ROOT/result | grep -q "$1"'$' || fail "missing reference $1"
} }
# Test the export of the runtime dependency graph. # Test the export of the runtime dependency graph.

2
tests/lang/eval-okay-context-introspection.exp
View file

@ -1 +1 @@
true [ true true true true true true ]

23
tests/lang/eval-okay-context-introspection.nix
View file

@ -18,7 +18,24 @@ let
}; };
}; };
legit-context = builtins.getContext "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}"; combo-path = "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
legit-context = builtins.getContext combo-path;
constructed-context = builtins.getContext (builtins.appendContext "" desired-context); reconstructed-path = builtins.appendContext
in legit-context == constructed-context (builtins.unsafeDiscardStringContext combo-path)
desired-context;
# Eta rule for strings with context.
etaRule = str:
str == builtins.appendContext
(builtins.unsafeDiscardStringContext str)
(builtins.getContext str);
in [
(legit-context == desired-context)
(reconstructed-path == combo-path)
(etaRule "foo")
(etaRule drv.drvPath)
(etaRule drv.foo.outPath)
(etaRule (builtins.unsafeDiscardOutputDependency drv.drvPath))
]

2
tests/lang/eval-okay-readDir.exp
View file

@ -1 +1 @@
{ bar = "regular"; foo = "directory"; } { bar = "regular"; foo = "directory"; ldir = "symlink"; linked = "symlink"; }

1
tests/lang/eval-okay-readFileType.exp Normal file
View file

@ -0,0 +1 @@
{ bar = "regular"; foo = "directory"; ldir = "symlink"; linked = "symlink"; }

6
tests/lang/eval-okay-readFileType.nix Normal file
View file

@ -0,0 +1,6 @@
{
bar = builtins.readFileType ./readDir/bar;
foo = builtins.readFileType ./readDir/foo;
linked = builtins.readFileType ./readDir/linked;
ldir = builtins.readFileType ./readDir/ldir;
}

1
tests/lang/readDir/ldir Symbolic link
View file

@ -0,0 +1 @@
foo

1
tests/lang/readDir/linked Symbolic link
View file

@ -0,0 +1 @@
foo/git-hates-directories