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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-or-later
"""
Check out mkosi into specified location.
With -u, if changed, commit the latest hash.
"""
import argparse
import shlex
import subprocess
import re
from pathlib import Path
URL = 'https://github.com/systemd/mkosi'
BRANCH = 'main' # We only want to ever use commits on upstream 'main' branch
FILENAME = Path('.github/workflows/mkosi.yml')
def parse_args():
p = argparse.ArgumentParser(
description=__doc__,
)
p.add_argument(
'dir',
type=Path,
)
p.add_argument(
'--update', '-u',
action='store_true',
default=False,
)
return p.parse_args()
def read_config():
print(f'Reading {FILENAME}…')
matches = [m.group(1)
for line in open(FILENAME)
if (m := re.match('^- uses: systemd/mkosi@([a-z0-9]{40})$',
line.strip()))]
assert len(matches) == 1
return matches[0]
def commit_file(args, file: Path, commit: str, changes: str):
cmd = [
'git', '-C', args.dir.as_posix(),
'describe',
'--always',
commit]
print(f"+ {shlex.join(cmd)}")
desc = subprocess.check_output(cmd, text=True).strip()
message = '\n'.join((
f'mkosi: update mkosi commit reference to {desc}',
'',
changes))
cmd = ['git', 'commit', '-m', message, file.as_posix()]
print(f"+ {shlex.join(cmd)}")
subprocess.check_call(cmd)
def checkout_mkosi(args):
if args.dir.exists():
print(f'{args.dir} already exists.')
return
cmd = [
'git', 'clone', URL,
f'--branch={BRANCH}',
args.dir.as_posix(),
]
print(f"+ {shlex.join(cmd)}")
subprocess.check_call(cmd)
def update_mkosi(args):
old_commit = read_config()
cmd = ['git', '-C', args.dir.as_posix(), 'rev-parse', f'refs/remotes/origin/{BRANCH}']
print(f"+ {shlex.join(cmd)}")
new_commit = subprocess.check_output(cmd, text=True).strip()
if old_commit == new_commit:
print(f'mkosi: commit {new_commit!s} is still fresh')
return
cmd = ['git', '-C', args.dir.as_posix(), 'log', '--graph',
'--pretty=oneline', '--no-decorate', '--abbrev-commit', '--abbrev=10',
f'{old_commit}..{new_commit}']
print(f"+ {shlex.join(cmd)}")
changes = subprocess.check_output(cmd, text=True).strip()
s = FILENAME.read_text()
assert old_commit in s
print(f'mkosi: {FILENAME}: found old hash, updating…')
new = s.replace(old_commit, new_commit)
assert new != s
FILENAME.write_text(new)
commit_file(args, FILENAME, new_commit, changes)
if __name__ == '__main__':
args = parse_args()
checkout_mkosi(args)
if args.update:
update_mkosi(args)
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