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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.
"""Various utility code used by tests.
If you want to write a per-test fixture, see conftest.py instead.
"""
import contextlib
import functools
from pathlib import Path
import subprocess
import tempfile
from typing import Optional, Union
import git_command
THIS_FILE = Path(__file__).resolve()
THIS_DIR = THIS_FILE.parent
FIXTURES_DIR = THIS_DIR / "fixtures"
def init_git_tree(
path: Union[str, Path],
ref_format: Optional[str] = None,
) -> None:
"""Initialize `path` as a new git repo."""
with contextlib.ExitStack() as stack:
# Tests need to assume, that main is default branch at init,
# which is not supported in config until 2.28.
cmd = ["git"]
if ref_format:
cmd += ["-c", f"init.defaultRefFormat={ref_format}"]
cmd += ["init"]
if git_command.git_require((2, 28, 0)):
cmd += ["--initial-branch=main"]
else:
# Use template dir for init.
templatedir = stack.enter_context(
tempfile.mkdtemp(prefix="git-template")
)
(Path(templatedir) / "HEAD").write_text("ref: refs/heads/main\n")
cmd += ["--template", templatedir]
cmd += [path]
subprocess.run(cmd, check=True)
@contextlib.contextmanager
def TempGitTree():
"""Create a new empty git checkout for testing."""
with tempfile.TemporaryDirectory(prefix="repo-tests") as tempdir:
init_git_tree(tempdir)
yield tempdir
@functools.lru_cache(maxsize=None)
def supports_reftable() -> bool:
"""Check if git supports reftable."""
with tempfile.TemporaryDirectory(prefix="repo-tests") as tempdir:
proc = subprocess.run(
["git", "-c", "init.defaultRefFormat=reftable", "init"],
cwd=tempdir,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
check=False,
)
return proc.returncode == 0
@functools.lru_cache(maxsize=None)
def supports_refs_migrate() -> bool:
"""Check if git supports refs migrate."""
with tempfile.TemporaryDirectory(prefix="repo-tests") as tempdir:
subprocess.check_call(
["git", "-c", "init.defaultRefFormat=files", "init"],
cwd=tempdir,
)
proc = subprocess.run(
[
"git",
"refs",
"migrate",
"--ref-format=reftable",
"--dry-run",
],
cwd=tempdir,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
check=False,
)
return proc.returncode == 0
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