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Merge pull request #9568 from hercules-ci/revert-9553

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Revert 9553
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Robert Hensing 2023-12-09 03:49:53 +01:00 committed by GitHub
commit 7cdc8786d9
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8 changed files with 41 additions and 73 deletions
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50
doc/manual/rl-next/print-value-in-coercion-error.md
View file

@ -1,50 +0,0 @@
synopsis: Coercion errors include the failing value
issues: #561
prs: #9553
description: {
The `error: cannot coerce a <TYPE> to a string` message now includes the value which caused the error.
Previously, a failed string coercion produced a confusing error message if the trace didn't show where the offending value was defined:
```bash
$ nix-instantiate --eval --expr '
let x = { a = 1; }; in
"${x}"
'
error:
… while evaluating a path segment
at «string»:4:2:
3|
4| "${x}"
| ^
5|
error: cannot coerce a set to a string
```
Now, the error message includes the value itself:
```bash
$ nix-instantiate --eval --expr '
let x = { a = 1; }; in
"${x}"
'
error:
… while evaluating a path segment
at «string»:4:2:
3|
4| "${x}"
| ^
5|
error: cannot coerce a set to a string: { a = 1; }
```
}

2
doc/manual/src/language/string-interpolation.md
View file

@ -189,7 +189,7 @@ If neither is present, an error is thrown.
> "${a}"
> ```
>
> error: cannot coerce a set to a string: { }
> error: cannot coerce a set to a string
>
> at «string»:4:2:
>

10
src/libexpr/eval.cc
View file

@ -27,9 +27,9 @@
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <iostream>
#include <fstream>
#include <functional>
#include <sstream>
#include <sys/resource.h>
#include <nlohmann/json.hpp>
@ -2230,7 +2230,7 @@ BackedStringView EvalState::coerceToString(
return std::move(*maybeString);
auto i = v.attrs->find(sOutPath);
if (i == v.attrs->end()) {
error("cannot coerce %1% to a string: %2%", showType(v), printValue(*this, v))
error("cannot coerce %1% to a string", showType(v))
.withTrace(pos, errorCtx)
.debugThrow<TypeError>();
}
@ -2276,7 +2276,7 @@ BackedStringView EvalState::coerceToString(
}
}
error("cannot coerce %1% to a string: %2%", showType(v), printValue(*this, v))
error("cannot coerce %1% to a string", showType(v))
.withTrace(pos, errorCtx)
.debugThrow<TypeError>();
}
@ -2635,10 +2635,8 @@ void EvalState::printStatistics()
std::string ExternalValueBase::coerceToString(const Pos & pos, NixStringContext & context, bool copyMore, bool copyToStore) const
{
std::stringstream printed;
print(printed);
throw TypeError({
.msg = hintfmt("cannot coerce %1% to a string: %2%", showType(), printed.str())
.msg = hintfmt("cannot coerce %1% to a string", showType())
});
}

2
tests/functional/lang/eval-fail-bad-string-interpolation-1.err.exp
View file

@ -7,4 +7,4 @@ error:
| ^
2|
error: cannot coerce a function to a string: <LAMBDA>
error: cannot coerce a function to a string

2
tests/functional/lang/eval-fail-bad-string-interpolation-3.err.exp
View file

@ -7,4 +7,4 @@ error:
| ^
2|
error: cannot coerce a function to a string: <LAMBDA>
error: cannot coerce a function to a string

11
tests/functional/lang/eval-fail-bad-string-interpolation-4.err.exp Normal file
View file

@ -0,0 +1,11 @@
error:
… while evaluating a path segment
at /pwd/lang/eval-fail-bad-string-interpolation-4.nix:9:3:
8| # The error message should not be too long.
9| ''${pkgs}''
| ^
10|
error: cannot coerce a set to a string

9
tests/functional/lang/eval-fail-bad-string-interpolation-4.nix Normal file
View file

@ -0,0 +1,9 @@
let
# Basically a "billion laughs" attack, but toned down to simulated `pkgs`.
ha = x: y: { a = x y; b = x y; c = x y; d = x y; e = x y; f = x y; g = x y; h = x y; j = x y; };
has = ha (ha (ha (ha (x: x)))) "ha";
# A large structure that has already been evaluated.
pkgs = builtins.deepSeq has has;
in
# The error message should not be too long.
''${pkgs}''

28
tests/unit/libexpr/error_traces.cc
View file

@ -295,7 +295,7 @@ namespace nix {
TEST_F(ErrorTraceTest, toPath) {
ASSERT_TRACE2("toPath []",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"),
hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while evaluating the first argument passed to builtins.toPath"));
ASSERT_TRACE2("toPath \"foo\"",
@ -309,7 +309,7 @@ namespace nix {
TEST_F(ErrorTraceTest, storePath) {
ASSERT_TRACE2("storePath true",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a Boolean", "true"),
hintfmt("cannot coerce %s to a string", "a Boolean"),
hintfmt("while evaluating the first argument passed to 'builtins.storePath'"));
}
@ -318,7 +318,7 @@ namespace nix {
TEST_F(ErrorTraceTest, pathExists) {
ASSERT_TRACE2("pathExists []",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"),
hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while realising the context of a path"));
ASSERT_TRACE2("pathExists \"zorglub\"",
@ -332,7 +332,7 @@ namespace nix {
TEST_F(ErrorTraceTest, baseNameOf) {
ASSERT_TRACE2("baseNameOf []",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"),
hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while evaluating the first argument passed to builtins.baseNameOf"));
}
@ -377,7 +377,7 @@ namespace nix {
TEST_F(ErrorTraceTest, filterSource) {
ASSERT_TRACE2("filterSource [] []",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"),
hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while evaluating the second argument (the path to filter) passed to 'builtins.filterSource'"));
ASSERT_TRACE2("filterSource [] \"foo\"",
@ -1038,7 +1038,7 @@ namespace nix {
TEST_F(ErrorTraceTest, toString) {
ASSERT_TRACE2("toString { a = 1; }",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ a = 1; }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the first argument passed to builtins.toString"));
}
@ -1057,7 +1057,7 @@ namespace nix {
ASSERT_TRACE2("substring 0 3 {}",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the third argument (the string) passed to builtins.substring"));
ASSERT_TRACE1("substring (-3) 3 \"sometext\"",
@ -1070,7 +1070,7 @@ namespace nix {
TEST_F(ErrorTraceTest, stringLength) {
ASSERT_TRACE2("stringLength {} # TODO: context is missing ???",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the argument passed to builtins.stringLength"));
}
@ -1143,7 +1143,7 @@ namespace nix {
ASSERT_TRACE2("concatStringsSep \"foo\" [ 1 2 {} ] # TODO: coerce to string is buggy",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "an integer", "1"),
hintfmt("cannot coerce %s to a string", "an integer"),
hintfmt("while evaluating one element of the list of strings to concat passed to builtins.concatStringsSep"));
}
@ -1229,12 +1229,12 @@ namespace nix {
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = {}; }",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the attribute 'system' of derivation 'foo'"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = {}; }",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the attribute 'outputs' of derivation 'foo'"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"drv\"; }",
@ -1279,17 +1279,17 @@ namespace nix {
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; args = [ {} ]; }",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating an element of the argument list"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; args = [ \"a\" {} ]; }",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating an element of the argument list"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; FOO = {}; }",
TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"),
hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the attribute 'FOO' of derivation 'foo'"));
}