Backup git repository to another remote

backup-all-git-repos.sh

#!/bin/bash
#
# Given a GIT repository with two remotes, uses one as `origin`
# and other as `destination` for the backup.
# Usage:
# /usr/bin/backup-all-git-repos.sh [repo-name]
# 	repo-name: Name of the repository to backup, is actually
#		   the directory of the repository in the FS.
#		   If specified only backups that repository.
#
# vim: et ts=4 sw=4:

set -e # Stop on errors

declare -r REPOSITORIES_DIRECTORY=/repositories
declare -r REMOTE_ORIGIN=origin
declare -r REMOTE_DESTINATION=bitbucket

# Re-indents input with a tab before all lines.
indent() {
    sed "s/^/\t/"
}

push_changes_from_remote_to_another() {
    [[ -z "$1" ]] && { echo "!!! Missing repository directory to backup!"; return 1; }
    [[ -z "$2" ]] && { echo "!!! Missing remote name to fetch changes from!"; return 1; }
    [[ -z "$3" ]] && { echo "!!! Missing remote name to send changes to!"; return 1; }

    declare -r repository_dir=$1
    declare -r origin_remote=$2
    declare -r destiny_remote=$3

    cd $repository_dir;
    echo "Fetching changes from $origin_remote"
    git fetch -v ${origin_remote} 2>&1
    echo

    branches=$(git branch -a | grep "remotes/${origin_remote}" | grep -v HEAD)
    branch_quantity=$(git branch -a | grep "remotes/${origin_remote}" | grep -v HEAD | wc -l)
    echo "Branches to update: $branch_quantity"
    for remote in $branches ; do
        BRANCH_NAME=$(echo $remote | grep -oE '[^/]+$')
        echo  "Pushing remote  $remote -> $BRANCH_NAME"
        git push -f $destiny_remote $remote:refs/heads/$BRANCH_NAME 2>&1 | indent
    done
}

fetch_repository_list() {
    only_repository_name=$1
    if [ -z "$only_repository_name" ]; then
        ls -d $REPOSITORIES_DIRECTORY/*
        return 0;
    fi

    repo_full_path="${REPOSITORIES_DIRECTORY}/${only_repository_name}"
    if [ ! -d $repo_full_path ]; then
        echo "!!! Repository '${only_repository_name}' does not exist on $REPOSITORIES_DIRECTORY."
        exit 1;
    fi

    echo $repo_full_path;
}

for dir in $(fetch_repository_list $1); do
    echo "Backing up ${dir} ...";
    push_changes_from_remote_to_another $dir $REMOTE_ORIGIN $REMOTE_DESTINATION | indent
done