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Clear displayPrefix in makeEmptySourceAccessor

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Judging by the comment for `makeEmptySourceAccessor` the prefix has
to be empty:

> Return a source accessor that contains only an empty root directory.

Fixes #13295.
This commit is contained in:
Sergei Zimmerman 2025-05-29 19:35:12 +00:00
parent 20226c85bc
commit fba1bb0c13
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2 changed files with 16 additions and 0 deletions
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4
src/libutil/memory-source-accessor.cc
View file

@ -187,6 +187,10 @@ void MemorySink::createSymlink(const CanonPath & path, const std::string & targe
ref<SourceAccessor> makeEmptySourceAccessor()
{
static auto empty = make_ref<MemorySourceAccessor>().cast<SourceAccessor>();
/* Don't forget to clear the display prefix, as the default constructed
SourceAccessor has the «unknown» prefix. Since this accessor is supposed
to mimic an empty root directory the prefix needs to be empty. */
empty->setPathDisplay("");
return empty;
}

12
tests/functional/pure-eval.sh
View file

@ -34,3 +34,15 @@ rm -rf $TEST_ROOT/eval-out
(! nix eval --store dummy:// --write-to $TEST_ROOT/eval-out --expr '{ "." = "bla"; }')
(! nix eval --expr '~/foo')
expectStderr 0 nix eval --expr "/some/absolute/path" \
| grepQuiet "/some/absolute/path"
expectStderr 0 nix eval --expr "/some/absolute/path" --impure \
| grepQuiet "/some/absolute/path"
expectStderr 0 nix eval --expr "some/relative/path" \
| grepQuiet "$PWD/some/relative/path"
expectStderr 0 nix eval --expr "some/relative/path" --impure \
| grepQuiet "$PWD/some/relative/path"