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import logging.config
import os
import re
import subprocess
import sys
from github import Github
REBUILD_ALL_PATTERNS = [
r'^\.circleci/\.*',
r'^\.github/\.*',
r'^package\.json',
r'^yarn\.lock',
r'ops/check-changed/.*'
]
WHITELISTED_BRANCHES = {
'master',
'develop'
}
LOGGING_CONFIG = {
'version': 1,
'disable_existing_loggers': True,
'formatters': {
'standard': {
'format': '%(asctime)s [%(levelname)s]: %(message)s'
},
},
'handlers': {
'default': {
'level': 'INFO',
'formatter': 'standard',
'class': 'logging.StreamHandler',
'stream': 'ext://sys.stderr'
},
},
'loggers': {
'': {
'handlers': ['default'],
'level': 'INFO',
'propagate': False
},
}
}
logging.config.dictConfig(LOGGING_CONFIG)
log = logging.getLogger(__name__)
def main():
patterns = sys.argv[1].split(',')
patterns = patterns + REBUILD_ALL_PATTERNS
fp = os.path.realpath(__file__)
monorepo_path = os.path.realpath(os.path.join(fp, '..', '..'))
log.info('Discovered monorepo path: %s', monorepo_path)
current_branch = git_cmd('rev-parse --abbrev-ref HEAD', monorepo_path)
log.info('Current branch: %s', current_branch)
if current_branch in WHITELISTED_BRANCHES:
log.info('Current branch %s is whitelisted, triggering build', current_branch)
exit_build()
pr_urls = os.getenv('CIRCLE_PULL_REQUESTS', None)
pr_urls = pr_urls.split(',') if pr_urls else []
if len(pr_urls) == 0:
log.info('Not a PR build, triggering build')
exit_build()
if len(pr_urls) > 1:
log.warning('Multiple PR URLs found, choosing the first one. PRs found:')
for url in pr_urls:
log.warning(url)
gh_token = os.getenv('GITHUB_ACCESS_TOKEN')
if gh_token is None:
log.info('No GitHub access token found - likely a fork. Triggering build')
exit_build()
g = Github(gh_token)
try:
g.get_user()
repo = g.get_repo(os.getenv('CIRCLE_PROJECT_USERNAME') + '/' + os.getenv('CIRCLE_PROJECT_REPONAME'))
except Exception:
log.exception('Failed to get repo from GitHub')
exit_build()
pr = repo.get_pull(int(pr_urls[0].split('/')[-1]))
log.info('Found PR: %s', pr.url)
base_sha = pr.base.sha
head_sha = pr.head.sha
diffs = git_cmd('diff --name-only {}...{}'.format(base_sha, head_sha), monorepo_path).split('\n')
log.info('Found diff. Checking for matches...')
for diff in diffs:
if match_path(diff, patterns):
log.info('Match found, triggering build')
exit_build()
else:
log.info('❌ no match found on %s', diff)
log.info('No matches found, skipping build')
exit_nobuild()
def git_cmd(cmd, cwd):
return subprocess.check_output(['git'] + cmd.split(' '), cwd=cwd).decode('utf-8').strip()
def match_path(path, patterns):
for pattern in patterns:
if re.search(pattern, path):
log.info('✅ match found on %s: %s', path, pattern)
return True
return False
def exit_build():
sys.exit(0)
def exit_nobuild():
subprocess.check_call(['circleci', 'step', 'halt'])
sys.exit(0)
if __name__ == '__main__':
try:
main()
except Exception:
log.exception('Unhandled exception, triggering build')
exit_build()