pygit2 exercise to create tags on certain commits. usage: enter the desired directory and exec the script from there.

backtag.py

#!/bin/env python

import pygit2
import logging
import re
import os
import os.path

def main():
    repo = pygit2.init_repository(os.getcwd())
    last = repo[repo.head.target]
    for c in [c for c in repo.walk(last.oid, pygit2.GIT_SORT_TIME) if c.author.name == 'Places CI Bot']:
        logging.debug('commit: {}'.format(c.hex))
        parent = c.parents[0]
        latest = tagname([p.new_file_path for p in parent.tree.diff_to_tree(c.tree)])
        if latest:
            logging.debug('  added dirname: {}'.format(latest))
            try:
                repo.create_tag(latest, c.hex, pygit2.GIT_OBJ_COMMIT, c.author, c.message)
            except ValueError as e:
                logging.debug('  fail to create tag {}: {}'.format(latest, str(e)))

def tagname(files):
    if files == []:
        return None

    prefix = os.path.commonprefix(files)
    while True:
        p = os.path.dirname(prefix)
        if p != '':
            prefix = p
            continue
        return prefix

if __name__ == '__main__':
    logging.basicConfig(format='%(levelname)s: %(message)s', level='DEBUG')
    main()