git-backup with auto generated backup remote

post-commit.sh

#!/bin/sh

GIT_MAIN_ROOT=/tmp/git-backup/git.repos
GIT_BACKUP_ROOT=/tmp/git-backup/git.repos.bak
GIT_BACKUP_REMOTE=backup

######

echo \>\>\> Backing up to $GIT_BACKUP_ROOT

if [[ `git remote | grep $GIT_BACKUP_REMOTE` == '' ]] ; then
  LOCAL_ORIGIN_PUSH_PATH=`git remote show -n origin | grep -e 'Push  URL' | sed 's/.*URL:\s//'`
  LOCAL_ORIGIN_PUSH_PATH_REL=${LOCAL_ORIGIN_PUSH_PATH/${GIT_MAIN_ROOT}/}
  REMOTE_BACKUP_PUSH_PATH=$GIT_BACKUP_ROOT$LOCAL_ORIGIN_PUSH_PATH_REL

  echo Backup remote \'$GIT_BACKUP_REMOTE\' not found. Creating new remote entry.

  if [[ ! -d $REMOTE_BACKUP_PUSH_PATH ]] ; then
    git init --bare $REMOTE_BACKUP_PUSH_PATH
  fi

  git remote add --mirror=push $GIT_BACKUP_REMOTE $REMOTE_BACKUP_PUSH_PATH

fi

git push $GIT_BACKUP_REMOTE