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.cirrus_get_filelist.py
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.cirrus_get_filelist.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import os
import subprocess
import sys
def _log(msg):
print(msg, file=sys.stderr)
def _run_subprocess(cmd_line, check=False):
"""Wrapper around subprocess.run that logs results on failure instead of aborting"""
result = subprocess.run(
cmd_line, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
if result.returncode:
_log(
f"ERROR: Command '{cmd_line}' returned non-zero exit status {result.returncode}"
)
_log(f"===BEGIN STDOUT===\n{result.stdout}\n===END STDOUT===")
_log(f"===BEGIN STDERR===\n{result.stderr}\n===END STDERR===")
if check:
sys.exit(result.returncode)
return result
def main():
# Get current SHA
head_sha = os.environ['CIRRUS_CHANGE_IN_REPO']
# Get base SHA
# Set default to one commit before
base_sha = head_sha + '^'
for candidate_env in ('CIRRUS_LAST_GREEN_CHANGE', 'CIRRUS_BASE_SHA'):
candidate_sha = os.getenv(candidate_env)
if candidate_sha:
base_sha = candidate_sha
break
# Log some info to diagnose possible CI bugs
_log(f'Found base hash {base_sha} and current hash {head_sha}')
get_diff_filelist = lambda: _run_subprocess(('git', 'diff', '--name-only', '--diff-filter=ACMR', f'{base_sha}..{head_sha}'))
# Get file list via git
result = get_diff_filelist()
if result.returncode:
# It might have failed because the PR base is not HEAD of base repo
# Therefore, we try to rebase against master and try again
# Note that this doesn't have to be a PR, in case Cirrus CI clones a repo that does not reflect
# the environment variables
clone_url = os.environ['CIRRUS_REPO_CLONE_URL']
_log(
f"'git diff' failed; trying to rebase against current HEAD of base repo ({clone_url})..."
)
_run_subprocess(('git', 'pull', '--rebase', clone_url, base_sha),
check=True)
result = get_diff_filelist()
# "result" may be re-assigned before we reach here
if result.returncode:
sys.exit(result.returncode)
print(result.stdout.strip())
if __name__ == '__main__':
main()