git-mirror.sh

#!/bin/bash

DEST_REPO=$1
DEST_BRANCH=$2
MESSAGE=$(git log -1 HEAD --pretty=format:%s)
SOURCE_BRANCH=$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')

git remote add destination $DEST_REPO
git fetch --all
git checkout -b destination-merging SOURCE_BRANCH
git reset --soft destination/$DEST_BRANCH
git commit -am "$MESSAGE"
git rebase -Xtheirs destination/$DEST_BRANCH
git checkout -b destination-branch destination/$DEST_BRANCH
git merge -Xtheirs --squash destination-merging 
git commit -am "$MESSAGE"
git push destination HEAD:$DEST_BRANCH
git branch -D destination-branch
git branch -D destination-working