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Merge remote-tracking branch 'upstream/master' into path-info

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John Ericson 2023-02-01 10:02:30 -05:00
commit 43414738a0
20 changed files with 205 additions and 66 deletions
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2
Makefile
View file

@ -36,4 +36,4 @@ endif
include mk/lib.mk
GLOBAL_CXXFLAGS += -g -Wall -include config.h -std=c++17 -I src
GLOBAL_CXXFLAGS += -g -Wall -include config.h -std=c++20 -I src

5
configure.ac
View file

@ -276,8 +276,11 @@ PKG_CHECK_MODULES([GTEST], [gtest_main])
# Look for rapidcheck.
# No pkg-config yet, https://github.com/emil-e/rapidcheck/issues/302
AC_LANG_PUSH(C++)
AC_CHECK_HEADERS([rapidcheck/gtest.h], [], [], [#include <gtest/gtest.h>])
AC_CHECK_LIB([rapidcheck], [])
dnl No good for C++ libs with mangled symbols
dnl AC_CHECK_LIB([rapidcheck], [])
AC_LANG_POP(C++)
# Look for nlohmann/json.

2
doc/manual/src/command-ref/nix-store.md
View file

@ -633,7 +633,7 @@ written to standard output.
A NAR archive is like a TAR or Zip archive, but it contains only the
information that Nix considers important. For instance, timestamps are
elided because all files in the Nix store have their timestamp set to 0
elided because all files in the Nix store have their timestamp set to 1
anyway. Likewise, all permissions are left out except for the execute
bit, because all files in the Nix store have 444 or 555 permission.

64
doc/manual/src/language/advanced-attributes.md
View file

@ -255,3 +255,67 @@ Derivations can declare some infrequently used optional attributes.
> substituted. Thus it is usually a good idea to align `system` with
> `builtins.currentSystem` when setting `allowSubstitutes` to
> `false`. For most trivial derivations this should be the case.
- [`__structuredAttrs`]{#adv-attr-structuredAttrs}\
If the special attribute `__structuredAttrs` is set to `true`, the other derivation
attributes are serialised in JSON format and made available to the
builder via the file `.attrs.json` in the builder’s temporary
directory. This obviates the need for `passAsFile` since JSON files
have no size restrictions, unlike process environments.
It also makes it possible to tweak derivation settings in a structured way; see
[`outputChecks`](#adv-attr-outputChecks) for example.
As a convenience to Bash builders,
Nix writes a script named `.attrs.sh` to the builder’s directory
that initialises shell variables corresponding to all attributes
that are representable in Bash. This includes non-nested
(associative) arrays. For example, the attribute `hardening.format = true`
ends up as the Bash associative array element `${hardening[format]}`.
- [`outputChecks`]{#adv-attr-outputChecks}\
When using [structured attributes](#adv-attr-structuredAttrs), the `outputChecks`
attribute allows defining checks per-output.
In addition to
[`allowedReferences`](#adv-attr-allowedReferences), [`allowedRequisites`](#adv-attr-allowedRequisites),
[`disallowedReferences`](#adv-attr-disallowedReferences) and [`disallowedRequisites`](#adv-attr-disallowedRequisites),
the following attributes are available:
- `maxSize` defines the maximum size of the output path.
- `maxClosureSize` defines the maximum size of the output's closure.
- `ignoreSelfRefs` controls whether self-references should be considered when
checking for allowed references/requisites.
```nix
__structuredAttrs = true;
outputChecks.out = {
# The closure of 'out' must not be larger than 256 MiB.
maxClosureSize = 256 * 1024 * 1024;
# It must not refer to the C compiler or to the 'dev' output.
disallowedRequisites = [ stdenv.cc "dev" ];
};
outputChecks.dev = {
# The 'dev' output must not be larger than 128 KiB.
maxSize = 128 * 1024;
};
```
- [`unsafeDiscardReferences`]{#adv-attr-unsafeDiscardReferences}\
When using [structured attributes](#adv-attr-structuredAttrs), the **experimental**
attribute `unsafeDiscardReferences` is a per-output boolean which, if set to `true`,
disables scanning the build output for runtime dependencies altogether.
```nix
__structuredAttrs = true;
unsafeDiscardReferences.out = true;
```
This is useful, for example, when generating self-contained filesystem images with
their own embedded Nix store: hashes found inside such an image refer
to the embedded store and not to the host's Nix store.
This is only allowed if the `discard-references` experimental feature is enabled.

2
perl/Makefile
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@ -1,6 +1,6 @@
makefiles = local.mk
GLOBAL_CXXFLAGS += -g -Wall -std=c++17 -I ../src
GLOBAL_CXXFLAGS += -g -Wall -std=c++20 -I ../src
-include Makefile.config

51
src/libcmd/installables.cc
View file

@ -379,10 +379,9 @@ Installable::getCursors(EvalState & state)
ref<eval_cache::AttrCursor>
Installable::getCursor(EvalState & state)
{
auto cursors = getCursors(state);
if (cursors.empty())
throw Error("cannot find flake attribute '%s'", what());
return cursors[0];
/* Although getCursors should return at least one element, in case it doesn't,
bound check to avoid an undefined behavior for vector[0] */
return getCursors(state).at(0);
}
static StorePath getDeriver(
@ -696,46 +695,28 @@ InstallableFlake::getCursors(EvalState & state)
std::vector<ref<eval_cache::AttrCursor>> res;
for (auto & attrPath : getActualAttrPaths()) {
auto attr = root->findAlongAttrPath(parseAttrPath(state, attrPath));
if (attr) res.push_back(ref(*attr));
}
return res;
}
ref<eval_cache::AttrCursor> InstallableFlake::getCursor(EvalState & state)
{
auto lockedFlake = getLockedFlake();
auto cache = openEvalCache(state, lockedFlake);
auto root = cache->getRoot();
Suggestions suggestions;
auto attrPaths = getActualAttrPaths();
for (auto & attrPath : attrPaths) {
debug("trying flake output attribute '%s'", attrPath);
auto attrOrSuggestions = root->findAlongAttrPath(
parseAttrPath(state, attrPath),
true
);
if (!attrOrSuggestions) {
suggestions += attrOrSuggestions.getSuggestions();
continue;
auto attr = root->findAlongAttrPath(parseAttrPath(state, attrPath));
if (attr) {
res.push_back(ref(*attr));
} else {
suggestions += attr.getSuggestions();
}
return *attrOrSuggestions;
}
throw Error(
suggestions,
"flake '%s' does not provide attribute %s",
flakeRef,
showAttrPaths(attrPaths));
if (res.size() == 0)
throw Error(
suggestions,
"flake '%s' does not provide attribute %s",
flakeRef,
showAttrPaths(attrPaths));
return res;
}
std::shared_ptr<flake::LockedFlake> InstallableFlake::getLockedFlake() const

12
src/libcmd/installables.hh
View file

@ -103,9 +103,13 @@ struct Installable
return {};
}
/* Get a cursor to each value this Installable could refer to. However
if none exists, throw exception instead of returning empty vector. */
virtual std::vector<ref<eval_cache::AttrCursor>>
getCursors(EvalState & state);
/* Get the first and most preferred cursor this Installable could refer
to, or throw an exception if none exists. */
virtual ref<eval_cache::AttrCursor>
getCursor(EvalState & state);
@ -193,15 +197,11 @@ struct InstallableFlake : InstallableValue
std::pair<Value *, PosIdx> toValue(EvalState & state) override;
/* Get a cursor to every attrpath in getActualAttrPaths() that
exists. */
/* Get a cursor to every attrpath in getActualAttrPaths()
that exists. However if none exists, throw an exception. */
std::vector<ref<eval_cache::AttrCursor>>
getCursors(EvalState & state) override;
/* Get a cursor to the first attrpath in getActualAttrPaths() that
exists, or throw an exception with suggestions if none exists. */
ref<eval_cache::AttrCursor> getCursor(EvalState & state) override;
std::shared_ptr<flake::LockedFlake> getLockedFlake() const;
FlakeRef nixpkgsFlakeRef() const override;

2
src/libcmd/nix-cmd.pc.in
View file

@ -6,4 +6,4 @@ Name: Nix
Description: Nix Package Manager
Version: @PACKAGE_VERSION@
Libs: -L${libdir} -lnixcmd
Cflags: -I${includedir}/nix -std=c++17
Cflags: -I${includedir}/nix -std=c++20

2
src/libexpr/nix-expr.pc.in
View file

@ -7,4 +7,4 @@ Description: Nix Package Manager
Version: @PACKAGE_VERSION@
Requires: nix-store bdw-gc
Libs: -L${libdir} -lnixexpr
Cflags: -I${includedir}/nix -std=c++17
Cflags: -I${includedir}/nix -std=c++20

2
src/libmain/nix-main.pc.in
View file

@ -6,4 +6,4 @@ Name: Nix
Description: Nix Package Manager
Version: @PACKAGE_VERSION@
Libs: -L${libdir} -lnixmain
Cflags: -I${includedir}/nix -std=c++17
Cflags: -I${includedir}/nix -std=c++20

2
src/libstore/binary-cache-store.cc
View file

@ -380,7 +380,7 @@ void BinaryCacheStore::queryPathInfoUncached(const StorePath & storePath,
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
getFile(narInfoFile,
{[=](std::future<std::optional<std::string>> fut) {
{[=,this](std::future<std::optional<std::string>> fut) {
try {
auto data = fut.get();

2
src/libstore/build/worker.cc
View file

@ -276,7 +276,7 @@ void Worker::run(const Goals & _topGoals)
if (!children.empty() || !waitingForAWhile.empty())
waitForInput();
else {
if (awake.empty() && 0 == settings.maxBuildJobs)
if (awake.empty() && 0U == settings.maxBuildJobs)
{
if (getMachines().empty())
throw Error("unable to start any build; either increase '--max-jobs' "

6
src/libstore/globals.cc
View file

@ -222,19 +222,19 @@ template<> void BaseSetting<SandboxMode>::convertToArg(Args & args, const std::s
.longName = name,
.description = "Enable sandboxing.",
.category = category,
.handler = {[=]() { override(smEnabled); }}
.handler = {[this]() { override(smEnabled); }}
});
args.addFlag({
.longName = "no-" + name,
.description = "Disable sandboxing.",
.category = category,
.handler = {[=]() { override(smDisabled); }}
.handler = {[this]() { override(smDisabled); }}
});
args.addFlag({
.longName = "relaxed-" + name,
.description = "Enable sandboxing, but allow builds to disable it.",
.category = category,
.handler = {[=]() { override(smRelaxed); }}
.handler = {[this]() { override(smRelaxed); }}
});
}

2
src/libstore/nix-store.pc.in
View file

@ -6,4 +6,4 @@ Name: Nix
Description: Nix Package Manager
Version: @PACKAGE_VERSION@
Libs: -L${libdir} -lnixstore -lnixutil
Cflags: -I${includedir}/nix -std=c++17
Cflags: -I${includedir}/nix -std=c++20

2
src/libutil/args.cc
View file

@ -324,7 +324,7 @@ MultiCommand::MultiCommand(const Commands & commands_)
expectArgs({
.label = "subcommand",
.optional = true,
.handler = {[=](std::string s) {
.handler = {[=,this](std::string s) {
assert(!command);
auto i = commands.find(s);
if (i == commands.end()) {

8
src/libutil/config.cc
View file

@ -209,7 +209,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
.description = fmt("Set the `%s` setting.", name),
.category = category,
.labels = {"value"},
.handler = {[=](std::string s) { overridden = true; set(s); }},
.handler = {[this](std::string s) { overridden = true; set(s); }},
});
if (isAppendable())
@ -218,7 +218,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
.description = fmt("Append to the `%s` setting.", name),
.category = category,
.labels = {"value"},
.handler = {[=](std::string s) { overridden = true; set(s, true); }},
.handler = {[this](std::string s) { overridden = true; set(s, true); }},
});
}
@ -270,13 +270,13 @@ template<> void BaseSetting<bool>::convertToArg(Args & args, const std::string &
.longName = name,
.description = fmt("Enable the `%s` setting.", name),
.category = category,
.handler = {[=]() { override(true); }}
.handler = {[this]() { override(true); }}
});
args.addFlag({
.longName = "no-" + name,
.description = fmt("Disable the `%s` setting.", name),
.category = category,
.handler = {[=]() { override(false); }}
.handler = {[this]() { override(false); }}
});
}

12
src/libutil/config.hh
View file

@ -250,11 +250,15 @@ public:
operator const T &() const { return value; }
operator T &() { return value; }
const T & get() const { return value; }
bool operator ==(const T & v2) const { return value == v2; }
bool operator !=(const T & v2) const { return value != v2; }
void operator =(const T & v) { assign(v); }
template<typename U>
bool operator ==(const U & v2) const { return value == v2; }
template<typename U>
bool operator !=(const U & v2) const { return value != v2; }
template<typename U>
void operator =(const U & v) { assign(v); }
virtual void assign(const T & v) { value = v; }
void setDefault(const T & v) { if (!overridden) value = v; }
template<typename U>
void setDefault(const U & v) { if (!overridden) value = v; }
void set(const std::string & str, bool append = false) override;

62
src/nix/flake.cc
View file

@ -1002,6 +1002,61 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
auto flake = std::make_shared<LockedFlake>(lockFlake());
auto localSystem = std::string(settings.thisSystem.get());
std::function<bool(
eval_cache::AttrCursor & visitor,
const std::vector<Symbol> &attrPath,
const Symbol &attr)> hasContent;
// For frameworks it's important that structures are as lazy as possible
// to prevent infinite recursions, performance issues and errors that
// aren't related to the thing to evaluate. As a consequence, they have
// to emit more attributes than strictly (sic) necessary.
// However, these attributes with empty values are not useful to the user
// so we omit them.
hasContent = [&](
eval_cache::AttrCursor & visitor,
const std::vector<Symbol> &attrPath,
const Symbol &attr) -> bool
{
auto attrPath2(attrPath);
attrPath2.push_back(attr);
auto attrPathS = state->symbols.resolve(attrPath2);
const auto & attrName = state->symbols[attr];
auto visitor2 = visitor.getAttr(attrName);
if ((attrPathS[0] == "apps"
|| attrPathS[0] == "checks"
|| attrPathS[0] == "devShells"
|| attrPathS[0] == "legacyPackages"
|| attrPathS[0] == "packages")
&& (attrPathS.size() == 1 || attrPathS.size() == 2)) {
for (const auto &subAttr : visitor2->getAttrs()) {
if (hasContent(*visitor2, attrPath2, subAttr)) {
return true;
}
}
return false;
}
if ((attrPathS.size() == 1)
&& (attrPathS[0] == "formatter"
|| attrPathS[0] == "nixosConfigurations"
|| attrPathS[0] == "nixosModules"
|| attrPathS[0] == "overlays"
)) {
for (const auto &subAttr : visitor2->getAttrs()) {
if (hasContent(*visitor2, attrPath2, subAttr)) {
return true;
}
}
return false;
}
// If we don't recognize it, it's probably content
return true;
};
std::function<nlohmann::json(
eval_cache::AttrCursor & visitor,
const std::vector<Symbol> & attrPath,
@ -1027,7 +1082,12 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
{
if (!json)
logger->cout("%s", headerPrefix);
auto attrs = visitor.getAttrs();
std::vector<Symbol> attrs;
for (const auto &attr : visitor.getAttrs()) {
if (hasContent(visitor, attrPath, attr))
attrs.push_back(attr);
}
for (const auto & [i, attr] : enumerate(attrs)) {
const auto & attrName = state->symbols[attr];
bool last = i + 1 == attrs.size();

4
src/nix/search.cc
View file

@ -56,8 +56,8 @@ struct CmdSearch : InstallableCommand, MixJSON
Strings getDefaultFlakeAttrPaths() override
{
return {
"packages." + settings.thisSystem.get() + ".",
"legacyPackages." + settings.thisSystem.get() + "."
"packages." + settings.thisSystem.get(),
"legacyPackages." + settings.thisSystem.get()
};
}

27
tests/flakes/show.sh
View file

@ -37,3 +37,30 @@ in
assert show_output.legacyPackages.${builtins.currentSystem}.hello.name == "simple";
true
'
# Test that attributes are only reported when they have actual content
cat >flake.nix <<EOF
{
description = "Bla bla";
outputs = inputs: rec {
apps.$system = { };
checks.$system = { };
devShells.$system = { };
legacyPackages.$system = { };
packages.$system = { };
packages.someOtherSystem = { };
formatter = { };
nixosConfigurations = { };
nixosModules = { };
};
}
EOF
nix flake show --json --all-systems > show-output.json
nix eval --impure --expr '
let show_output = builtins.fromJSON (builtins.readFile ./show-output.json);
in
assert show_output == { };
true
'