In the event you need to migrate repos from GitHub

ghmigrate.sh

#!/usr/bin/env bash

# Conf section

GH_USER=USER
DEST_USER=gitolite
DEST_HOST=example.com
TMPDIR=${HOME}/tmp/gitmigration

mkdir -p $TMPDIR

set -e

test $1 || {
  echo "Need repository name"
  exit 1
}

REPO=$1

function clone_destination() {
  echo "clone_destination"

  cd $TMPDIR
  git clone ssh://${DEST_USER}@${DEST_HOST}/$REPO
}

function add_github() {
  echo "add_github"
  cd ${TMPDIR}/$REPO

  git remote add github git+ssh://git@github.com/${GH_USER}/${REPO}.git
  git fetch github
}

function migrate_branches() {
  echo "migrate_branches"
  cd ${TMPDIR}/$REPO

  for raw_branch in $(git branch -a); do
    branch=$(echo $raw_branch | cut -f3 -d/)

    git checkout -b $branch github/$branch
    git push -u origin $branch
  done
  git push origin --tags
}

clone_destination $REPO
add_github
migrate_branches