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GitInputAccessor: Support symlinks

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This commit is contained in:
Eelco Dolstra 2023-02-17 16:33:10 +01:00
parent f4009fdd9b
commit ece20d53dc
2 changed files with 32 additions and 12 deletions
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36
src/libfetchers/git-accessor.cc
View file

@ -74,15 +74,20 @@ struct GitInputAccessor : InputAccessor
}
}
std::string readFile(const CanonPath & path) override
std::string readBlob(const CanonPath & path, bool symlink)
{
auto blob = getBlob(path);
auto blob = getBlob(path, symlink);
auto data = std::string_view((const char *) git_blob_rawcontent(blob.get()), git_blob_rawsize(blob.get()));
return std::string(data);
}
std::string readFile(const CanonPath & path) override
{
return readBlob(path, false);
}
bool pathExists(const CanonPath & path) override
{
return path.isRoot() ? true : (bool) lookup(path);
@ -142,7 +147,7 @@ struct GitInputAccessor : InputAccessor
std::string readLink(const CanonPath & path) override
{
throw UnimplementedError("GitInputAccessor::readLink");
return readBlob(path, true);
}
std::map<CanonPath, TreeEntry> lookupCache;
@ -200,23 +205,36 @@ struct GitInputAccessor : InputAccessor
return Tree(tree);
}
Blob getBlob(const CanonPath & path)
Blob getBlob(const CanonPath & path, bool expectSymlink)
{
auto notRegular = [&]()
auto notExpected = [&]()
{
throw Error("'%s' is not a regular file", showPath(path));
throw Error(
expectSymlink
? "'%s' is not a symlink"
: "'%s' is not a regular file",
showPath(path));
};
if (path.isRoot()) notRegular();
if (path.isRoot()) notExpected();
auto entry = need(path);
if (git_tree_entry_type(entry) != GIT_OBJECT_BLOB)
notRegular();
notExpected();
auto mode = git_tree_entry_filemode(entry);
if (expectSymlink) {
if (mode != GIT_FILEMODE_LINK)
notExpected();
} else {
if (mode != GIT_FILEMODE_BLOB && mode != GIT_FILEMODE_BLOB_EXECUTABLE)
notExpected();
}
git_blob * blob = nullptr;
if (git_tree_entry_to_object((git_object * *) &blob, repo.get(), entry))
throw Error("looking up regular file '%s': %s", showPath(path), git_error_last()->message);
throw Error("looking up file '%s': %s", showPath(path), git_error_last()->message);
return Blob(blob);
}

8
tests/flakes/flakes.sh
View file

@ -39,7 +39,9 @@ EOF
git -C $flake2Dir add flake.nix
git -C $flake2Dir commit -m 'Initial'
cat > $flake3Dir/flake.nix <<EOF
# Test symlink handling.
ln -s _flake.nix $flake3Dir/flake.nix
cat > $flake3Dir/_flake.nix <<EOF
{
description = "Fnord";
@ -57,7 +59,7 @@ cat > $flake3Dir/default.nix <<EOF
{ x = 123; }
EOF
git -C $flake3Dir add flake.nix default.nix
git -C $flake3Dir add flake.nix _flake.nix default.nix
git -C $flake3Dir commit -m 'Initial'
cat > $nonFlakeDir/README.md <<EOF
@ -166,7 +168,7 @@ nix build -o $TEST_ROOT/result --no-registries git+file://$flake2Dir#bar --refre
nix build -o $TEST_ROOT/result --no-use-registries git+file://$flake2Dir#bar --refresh
# Test whether indirect dependencies work.
nix build -o $TEST_ROOT/result $flake3Dir#xyzzy
nix build -o $TEST_ROOT/result git+file://$flake3Dir?ref=master#xyzzy
git -C $flake3Dir add flake.lock
# Add dependency to flake3.