synapse-product/synapse/util/versionstring.py

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# Copyright 2016 OpenMarket Ltd
#
# 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.
import logging
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import os
import subprocess
from types import ModuleType
from typing import Dict
logger = logging.getLogger(__name__)
version_cache: Dict[ModuleType, str] = {}
def get_version_string(module: ModuleType) -> str:
"""Given a module calculate a git-aware version string for it.
If called on a module not in a git checkout will return `__version__`.
Args:
module (module)
Returns:
str
"""
cached_version = version_cache.get(module)
if cached_version is not None:
return cached_version
# We want this to fail loudly with an AttributeError. Type-ignore this so
# mypy only considers the happy path.
version_string = module.__version__ # type: ignore[attr-defined]
try:
null = open(os.devnull, "w")
cwd = os.path.dirname(os.path.abspath(module.__file__))
try:
git_branch = (
subprocess.check_output(
["git", "rev-parse", "--abbrev-ref", "HEAD"], stderr=null, cwd=cwd
)
.strip()
.decode("ascii")
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)
git_branch = "b=" + git_branch
except (subprocess.CalledProcessError, FileNotFoundError):
# FileNotFoundError can arise when git is not installed
git_branch = ""
try:
git_tag = (
subprocess.check_output(
["git", "describe", "--exact-match"], stderr=null, cwd=cwd
)
.strip()
.decode("ascii")
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)
git_tag = "t=" + git_tag
except (subprocess.CalledProcessError, FileNotFoundError):
git_tag = ""
try:
git_commit = (
subprocess.check_output(
["git", "rev-parse", "--short", "HEAD"], stderr=null, cwd=cwd
)
.strip()
.decode("ascii")
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)
except (subprocess.CalledProcessError, FileNotFoundError):
git_commit = ""
try:
dirty_string = "-this_is_a_dirty_checkout"
is_dirty = (
subprocess.check_output(
["git", "describe", "--dirty=" + dirty_string], stderr=null, cwd=cwd
)
.strip()
.decode("ascii")
.endswith(dirty_string)
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)
git_dirty = "dirty" if is_dirty else ""
except (subprocess.CalledProcessError, FileNotFoundError):
git_dirty = ""
if git_branch or git_tag or git_commit or git_dirty:
git_version = ",".join(
s for s in (git_branch, git_tag, git_commit, git_dirty) if s
)
version_string = "%s (%s)" % (
# If the __version__ attribute doesn't exist, we'll have failed
# loudly above.
module.__version__, # type: ignore[attr-defined]
git_version,
)
except Exception as e:
logger.info("Failed to check for git repository: %s", e)
version_cache[module] = version_string
return version_string