example github mirror from launchpad

github-mirror.sh

#!/bin/sh
# OpenStack bzr to github mirror
#
# Requirements:
#   git >= 1.7.0, bzr >= 2.0.0,
#   git-bzr-ng, python-fastimport, patched bzr-fastimport

#####
# Set up unpackaged source:
#   mkdir ~/src
#   cd ~/src/
#   git clone git://github.com/termie/git-bzr-ng.git
#   bzr branch lp:python-fastimport
#   mkdir ~/bin
#   cd ~/bin/
#   ln -s ~/src/git-bzr-ng/git-bzr
#
# Patch bzr-fastimport:
#   mkdir -p ~/.bazaar/plugins
#   cd ~/.bazaar/plugins/
#   bzr branch lp:bzr-fastimport fastimport
#   one line patch to fix multi-author bzr commit export:
#
#=== modified file 'exporter.py'
#--- exporter.py	2010-11-09 18:26:43 +0000
#+++ exporter.py	2010-11-22 15:34:34 +0000
#@@ -287,7 +287,7 @@
#         else:
#             more_authors = []
#             author = revobj.get_apparent_author()
#-        if more_authors:
#+        if not self.plain_format and more_authors:
#             name, email = self._get_name_email(author)
#             author_info = (name, email, revobj.timestamp, revobj.timezone)
#             more_author_info = []

#####
# Set up local swift and nova repos:
#   mkdir ~/git-bzr
#   cd ~/git-bzr/
#   git bzr clone lp:nova nova
#   git bzr clone lp:swift swift
#   cd ~/git-bzr/nova/
#   git remote add github git@github.com:openstack/nova.git
#   cd ~/git-bzr/swift/
#   git remote add github git@github.com:openstack/swift.git

export PATH="$HOME/bin:$PATH"
export PYTHONPATH=$HOME/src/python-fastimport

REPOBASE=$HOME/git-bzr

for REPO in nova swift; do
  cd $REPOBASE/$REPO/
  echo "Syncing $REPO repository from launchpad.."
  git bzr sync
  echo "Merging $REPO bzr/master.."
  git merge bzr/master
  echo "Pushing $REPO repository to github.."
  git push github master
  cd $HOME
done

I am getting a error while using git push. This looks like

remote: error: object 3ed75d4bbxxxxxxxxxxxxxxxx7cc:contains '.git'
remote: fatal: Error in object
error: unpack failed: index-pack abnormal exit

Any idea why?