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Merge pull request #11690 from DeterminateSystems/non-contiguous-tarballs

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Handle tarballs where directory entries are not contiguous
This commit is contained in:
Eelco Dolstra 2024-10-14 14:50:31 +02:00 committed by GitHub
commit d5c45952ac
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GPG key ID: B5690EEEBB952194
2 changed files with 31 additions and 1 deletions
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18
src/libfetchers/git-utils.cc
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@ -977,8 +977,24 @@ struct GitFileSystemObjectSinkImpl : GitFileSystemObjectSink
void pushBuilder(std::string name)
{
const git_tree_entry * entry;
Tree prevTree = nullptr;
if (!pendingDirs.empty() &&
(entry = git_treebuilder_get(pendingDirs.back().builder.get(), name.c_str())))
{
/* Clone a tree that we've already finished. This happens
if a tarball has directory entries that are not
contiguous. */
if (git_tree_entry_type(entry) != GIT_OBJECT_TREE)
throw Error("parent of '%s' is not a directory", name);
if (git_tree_entry_to_object((git_object * *) (git_tree * *) Setter(prevTree), *repo, entry))
throw Error("looking up parent of '%s': %s", name, git_error_last()->message);
}
git_treebuilder * b;
if (git_treebuilder_new(&b, *repo, nullptr))
if (git_treebuilder_new(&b, *repo, prevTree.get()))
throw Error("creating a tree builder: %s", git_error_last()->message);
pendingDirs.push_back({ .name = std::move(name), .builder = TreeBuilder(b) });
};

14
tests/functional/tarball.sh
View file

@ -97,3 +97,17 @@ chmod +x "$TEST_ROOT/tar_root/foo"
tar cvf "$TEST_ROOT/tar.tar" -C "$TEST_ROOT/tar_root" .
path="$(nix flake prefetch --refresh --json "tarball+file://$TEST_ROOT/tar.tar" | jq -r .storePath)"
[[ $(cat "$path/foo") = bar ]]
# Test a tarball with non-contiguous directory entries.
rm -rf "$TEST_ROOT/tar_root"
mkdir -p "$TEST_ROOT/tar_root/a/b"
echo foo > "$TEST_ROOT/tar_root/a/b/foo"
echo bla > "$TEST_ROOT/tar_root/bla"
tar cvf "$TEST_ROOT/tar.tar" -C "$TEST_ROOT/tar_root" .
echo abc > "$TEST_ROOT/tar_root/bla"
echo xyzzy > "$TEST_ROOT/tar_root/a/b/xyzzy"
tar rvf "$TEST_ROOT/tar.tar" -C "$TEST_ROOT/tar_root" ./a/b/xyzzy ./bla
path="$(nix flake prefetch --refresh --json "tarball+file://$TEST_ROOT/tar.tar" | jq -r .storePath)"
[[ $(cat "$path/a/b/xyzzy") = xyzzy ]]
[[ $(cat "$path/a/b/foo") = foo ]]
[[ $(cat "$path/bla") = abc ]]