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src/nix/prefetch: fix prefetch containing current directory instead of tarball

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When --unpack was used the nix would add the current directory to the
nix store instead of the content of unpacked.
The reason for this is that std::distance already consumes the iterator.
To fix this we re-instantiate the directory iterator in case the
directory only contains a single entry.
This commit is contained in:
Jörg Thalheim 2024-07-05 17:26:58 +02:00
parent 8f280d72ff
commit 8cea1fbd97
2 changed files with 18 additions and 5 deletions
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11
src/nix/prefetch.cc
View file

@ -114,14 +114,15 @@ std::tuple<StorePath, Hash> prefetchFile(
createDirs(unpacked);
unpackTarfile(tmpFile.string(), unpacked);
auto entries = std::filesystem::directory_iterator{unpacked};
/* If the archive unpacks to a single file/directory, then use
that as the top-level. */
auto entries = std::filesystem::directory_iterator{unpacked};
auto file_count = std::distance(entries, std::filesystem::directory_iterator{});
if (file_count == 1)
tmpFile = entries->path();
else
tmpFile = entries->path();
unsigned fileCount = std::distance(entries, std::filesystem::directory_iterator{});
if (fileCount != 1) {
/* otherwise, use the directory itself */
tmpFile = unpacked;
}
}
Activity act(*logger, lvlChatty, actUnknown,

12
tests/functional/tarball.sh
View file

@ -54,6 +54,18 @@ test_tarball() {
# with the content-addressing
(! nix-instantiate --eval -E "fetchTree { type = \"tarball\"; url = file://$tarball; narHash = \"$hash\"; name = \"foo\"; }")
store_path=$(nix store prefetch-file --json "file://$tarball" | jq -r .storePath)
if ! cmp -s "$store_path" "$tarball"; then
echo "prefetched tarball differs from original: $store_path vs $tarball" >&2
exit 1
fi
store_path2=$(nix store prefetch-file --json --unpack "file://$tarball" | jq -r .storePath)
diff_output=$(diff -r "$store_path2" "$tarroot")
if [ -n "$diff_output" ]; then
echo "prefetched tarball differs from original: $store_path2 vs $tarroot" >&2
echo "$diff_output"
exit 1
fi
}
test_tarball '' cat