Clone only the history of a repo into a new repo

git_history_cloner.py

import pygit2
from pygit2 import GIT_SORT_TOPOLOGICAL, GIT_SORT_REVERSE

repo = pygit2.Repository("/path/to/the/repo")
hist_repo = pygit2.Repository("/path/to/the/repo/for/the/history")

parents = []
for commit in repo.walk(repo.head.target,
                        GIT_SORT_TOPOLOGICAL | GIT_SORT_REVERSE):
    print "[Duplicating] " + commit.message,
    tree = hist_repo.TreeBuilder().write()
    oid = hist_repo.create_commit(
        'refs/heads/master',
        commit.author,
        commit.committer,
        commit.message,
        tree,
        parents)
    parents = [oid]