gitmap

Map git commits to new commits, preserving history.

Usage

1. Install dependencies, pip install -r requirements.txt. (python2 is currently unsupported.)
2. Inherit the class gitmap.GitMap, and override blob_map and commit_map. The blob_map function maps a source path to a destination path, etc. The commit_map function maps a commit message to a new message, etc.
3. Call run(src_repo_path, dst_repo_path). All heads will be mapped.
4. Set remove_empty_commits to True if you want to remove empty commits. (A non-empty commit may be mapped to an empty commit, depending on your map function.)
5. Moreover, you can add blobs to each commit by overriding commit_add, and print progress by override progress. The commit_add returns a list of blobs, each of which is in the same scheme as blob_map. progress is called after each commit is mapped.

Example

See example.py.

class MyGitMap(gitmap.GitMap):
    def blob_map(self, data_stream, mode, path):
        # keep README and LICENSE
        if path in ['README.md', 'LICENSE.txt']:
            return data_stream.read(), mode, path
        # flatten python dir
        if path.startswith('python/'):
            return data_stream.read(), mode, path[len('python/'):]
        # delete other files
        else:
            return None

    def commit_add(self, old_commit):
        # add .gitignore
        return [
            (b'__pycache__\njittor.egg-info\n', 0o100644, '.gitignore'),
        ]

    def commit_map(self, old_commit, message, author, authored_date, author_tz_offset, committer, committed_date, committer_tz_offset):
        # keep author, update committer
        committer = git.Actor('Tailing Yuan', 'yuantailing@gmail.com')
        committed_date = time.time()
        return message, author, authored_date, author_tz_offset, committer, committed_date, committer_tz_offset

    def progress(self, old_commit, new_commit):
        # logging
        print('committed', old_commit, '=>', new_commit)

    remove_empty_commits = True

MyGitMap().run('../jittor', '../jittor-python-only')