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Detect NAR directory entries that collide with another path after case-hacking

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The test was made by @puckipedia.
This commit is contained in:
Eelco Dolstra 2024-09-05 19:26:10 +02:00
parent 77c090cdbd
commit 3557587381
3 changed files with 9 additions and 0 deletions
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3
src/libutil/archive.cc
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@ -243,6 +243,9 @@ static void parse(FileSystemObjectSink & sink, Source & source, const CanonPath
debug("case collision between '%1%' and '%2%'", i->first, name);
name += caseHackSuffix;
name += std::to_string(++i->second);
auto j = names.find(name);
if (j != names.end())
throw Error("NAR contains file name '%s' that collides with case-hacked file name '%s'", prevName, j->first);
} else
names[name] = 0;
}

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tests/functional/case-collision.nar Normal file
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6
tests/functional/nars.sh
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@ -37,3 +37,9 @@ cmp case.nar "$TEST_ROOT/case.nar"
# removal of the suffix).
touch "$TEST_ROOT/case/xt_CONNMARK.h~nix~case~hack~3"
(! nix-store "${opts[@]}" --dump "$TEST_ROOT/case" > /dev/null)
# Detect NARs that have a directory entry that after case-hacking
# collides with another entry (e.g. a directory containing 'Test',
# 'Test~nix~case~hack~1' and 'test').
rm -rf "$TEST_ROOT/case"
expectStderr 1 nix-store "${opts[@]}" --restore "$TEST_ROOT/case" < case-collision.nar | grepQuiet "NAR contains file name 'test' that collides with case-hacked file name 'Test~nix~case~hack~1'"