git-retag.py

#!/usr/bin/env python3

import subprocess
import sys


EMAIL_REPLACE = {
    "dmikurube@users.noreply.github.com": "dmikurube@treasure-data.com"
}


def git_commit(tag):
    return subprocess.check_output(['git', 'log', '-1', '--format=%H', tag, '--']).decode("utf-8").strip()


def git_tagger_date(tag):
    tagger_date = subprocess.check_output(['git', 'for-each-ref', "--format=%(taggerdate)", 'refs/tags/{}'.format(tag)]).decode("utf-8").strip()
    if tagger_date:
        return tagger_date
    return subprocess.check_output(['git', 'log', '-1', '--format=%cD', tag, '--']).decode("utf-8").strip()


def git_tagger_email(tag):
    tagger_email = subprocess.check_output(['git', 'for-each-ref', "--format=%(taggeremail:trim)", 'refs/tags/{}'.format(tag)]).decode("utf-8").strip()
    if tagger_email:
        return tagger_email

    committer_email = subprocess.check_output(['git', 'log', '-1', '--format=%ce', tag, '--']).decode("utf-8").strip()
    if committer_email.endswith('github.com'):
        author_email = subprocess.check_output(['git', 'log', '-1', '--format=%ae', tag, '--']).decode("utf-8").strip()
        if author_email in EMAIL_REPLACE:
            return EMAIL_REPLACE[author_email]
        return author_email
    return committer_email


def git_tagger_name(tag):
    tagger_name = subprocess.check_output(['git', 'for-each-ref', "--format=%(taggername)", 'refs/tags/{}'.format(tag)]).decode("utf-8").strip()
    if tagger_name:
        return tagger_name

    committer_name = subprocess.check_output(['git', 'log', '-1', '--format=%cn', tag, '--']).decode("utf-8").strip()
    if committer_name == 'GitHub':
        return subprocess.check_output(['git', 'log', '-1', '--format=%an', tag, '--']).decode("utf-8").strip()
    return committer_name


def git_retag(tag, commit, committer_date, committer_email, committer_name):
    subprocess.check_call(['git', 'tag', '-d', tag])
    subprocess.check_call(['git', '-c', 'core.commentChar=@', 'tag', '-a', '-F', tag, tag, commit], env={
        "GIT_COMMITTER_DATE": committer_date,
        "GIT_COMMITTER_EMAIL": committer_email,
        "GIT_COMMITTER_NAME": committer_name,
    })


def main(argv):
    if len(argv) < 2:
        return 1

    for tag in argv[1:]:
        commit = git_commit(tag)
        tagger_date = git_tagger_date(tag)
        tagger_email = git_tagger_email(tag)
        tagger_name = git_tagger_name(tag)
        print("tag {}".format(tag))
        print("commit {}".format(commit))
        print("Tagger: {} <{}> {}".format(tagger_name, tagger_email, tagger_date))
        print("")
        git_retag(tag, commit, tagger_date, tagger_email, tagger_name)


if __name__ == '__main__':
    sys.exit(main(sys.argv))