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llvm-premerge-checks/scripts/phabtalk/apply_patch.py

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#!/usr/bin/env python3
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# Copyright 2019 Google LLC
#
# Licensed under the the Apache License v2.0 with LLVM Exceptions (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://llvm.org/LICENSE.txt
#
# 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 argparse
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import json
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import os
import subprocess
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import sys
from typing import List, Optional
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from phabricator import Phabricator
class ApplyPatch:
def __init__(self, comment_file_path: str):
# TODO: turn os.environ parameter into command line arguments
# this would be much clearer and easier for testing
self.comment_file_path = comment_file_path
self.conduit_token = os.environ.get('CONDUIT_TOKEN') # type: Optional[str]
self.host = os.environ.get('PHABRICATOR_HOST') # type: Optional[str]
self._load_arcrc()
self.diff_id = os.environ['DIFF_ID'] # type: str
self.diff_json_path = os.environ['DIFF_JSON'] # type: str
if not self.host.endswith('/api/'):
self.host += '/api/'
self.phab = Phabricator(token=self.conduit_token, host=self.host)
self.git_hash = None # type: Optional[str]
self.msg = [] # type: List[str]
def _load_arcrc(self):
"""Load arc configuration from file if not set."""
if self.conduit_token is not None or self.host is not None:
return
print('Loading configuration from ~/.arcrc file')
with open(os.path.expanduser('~/.arcrc'), 'r') as arcrc_file:
arcrc = json.load(arcrc_file)
# use the first host configured in the file
self.host = next(iter(arcrc['hosts']))
self.conduit_token = arcrc['hosts'][self.host]['token']
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def run(self):
"""try to apply the patch from phabricator
Write to `self.comment_file` for showing error messages on Phabricator.
"""
self.phab.update_interfaces()
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try:
self._get_parent_hash()
self._git_checkout()
self._apply_patch()
finally:
self._write_error_message()
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def _get_parent_hash(self) -> str:
diff = self.phab.differential.getdiff(diff_id=self.diff_id)
# Keep a copy of the Phabricator answer for later usage in a json file
try:
with open(self.diff_json_path,'w') as json_file:
json.dump(diff.response, json_file, sort_keys=True, indent=4)
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print('Wrote diff details to "{}".'.format(self.diff_json_path))
except Exception:
print('WARNING: could not write build/diff.json log file')
self.git_hash = diff['sourceControlBaseRevision']
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def _git_checkout(self):
try:
print('Checking out git hash {}'.format(self.git_hash))
subprocess.check_call('git reset --hard {}'.format(self.git_hash),
stdout=sys.stdout, stderr=sys.stderr, shell=True)
except subprocess.CalledProcessError:
print('WARNING: checkout of hash failed, using master branch instead.')
self.msg += [
'Could not check out parent git hash "{}". It was not found in '
'the repository. Did you configure the "Parent Revision" in '
'Phabricator properly? Trying to apply the patch to the '
'master branch instead...'.format(self.git_hash)]
subprocess.check_call('git checkout master', stdout=sys.stdout,
stderr=sys.stderr, shell=True)
subprocess.check_call('git show -s', stdout=sys.stdout,
stderr=sys.stderr, shell=True)
print('git checkout completed.')
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def _apply_patch(self):
print('running arc patch...')
cmd = 'arc patch --force --nobranch --no-ansi --diff "{}" --nocommit '\
'--conduit-token "{}" --conduit-uri "{}"'.format(
self.diff_id, self.conduit_token, self.host )
result = subprocess.run(cmd, capture_output=True, shell=True, text=True)
print(result.stdout + result.stderr)
if result.returncode != 0:
msg = (
'ERROR: arc patch failed with error code {}. '
'Check build log for details.'.format(result.returncode))
self.msg += [msg]
raise Exception(msg)
print('Patching completed.')
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def _write_error_message(self):
"""Write the log message to a file."""
if self.comment_file_path is None:
return
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if len(self.msg) == 0:
return
print('writing error message to {}'.format(self.comment_file_path))
with open(self.comment_file_path, 'a') as comment_file:
text = '\n\n'.join(self.msg)
comment_file.write(text)
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if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Apply Phabricator patch to working directory.')
parser.add_argument('--comment-file', type=str, dest='comment_file_path', default=None)
args = parser.parse_args()
patcher = ApplyPatch(args.comment_file_path)
patcher.run()
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