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# Copyright (C) 2026 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Unittests for the git_refs.py module."""
import os
from pathlib import Path
import subprocess
import pytest
import utils_for_test
import git_refs
def _run(repo, *args):
return subprocess.run(
["git", "-C", repo, *args],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
encoding="utf-8",
check=True,
).stdout.strip()
def _init_repo(tmp_path, reftable=False):
repo = os.path.join(tmp_path, "repo")
ref_format = "reftable" if reftable else "files"
utils_for_test.init_git_tree(repo, ref_format=ref_format)
Path(os.path.join(repo, "a")).write_text("1")
_run(repo, "add", "a")
_run(repo, "commit", "-q", "-m", "init")
return repo
@pytest.mark.parametrize("reftable", [False, True])
def test_reads_refs(tmp_path, reftable):
if reftable and not utils_for_test.supports_reftable():
pytest.skip("reftable not supported")
repo = _init_repo(tmp_path, reftable=reftable)
gitdir = os.path.join(repo, ".git")
refs = git_refs.GitRefs(gitdir)
branch = _run(repo, "symbolic-ref", "--short", "HEAD")
head = _run(repo, "rev-parse", "HEAD")
assert refs.symref("HEAD") == f"refs/heads/{branch}"
assert refs.get("HEAD") == head
assert refs.get(f"refs/heads/{branch}") == head
@pytest.mark.parametrize("reftable", [False, True])
def test_updates_when_refs_change(tmp_path, reftable):
if reftable and not utils_for_test.supports_reftable():
pytest.skip("reftable not supported")
repo = _init_repo(tmp_path, reftable=reftable)
gitdir = os.path.join(repo, ".git")
refs = git_refs.GitRefs(gitdir)
head = _run(repo, "rev-parse", "HEAD")
assert refs.get("refs/heads/topic") == ""
_run(repo, "branch", "topic")
assert refs.get("refs/heads/topic") == head
_run(repo, "branch", "-D", "topic")
assert refs.get("refs/heads/topic") == ""
@pytest.mark.skipif(
not utils_for_test.supports_refs_migrate(),
reason="git refs migrate reftable support is required for this test",
)
def test_updates_when_storage_backend_toggles(tmp_path):
repo = _init_repo(tmp_path, reftable=False)
gitdir = os.path.join(repo, ".git")
refs = git_refs.GitRefs(gitdir)
head = _run(repo, "rev-parse", "HEAD")
assert refs.get("refs/heads/reftable-branch") == ""
_run(repo, "refs", "migrate", "--ref-format=reftable")
_run(repo, "branch", "reftable-branch")
assert refs.get("refs/heads/reftable-branch") == head
assert refs.get("refs/heads/files-branch") == ""
_run(repo, "refs", "migrate", "--ref-format=files")
_run(repo, "branch", "files-branch")
assert refs.get("refs/heads/files-branch") == head
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