backup git repos under a directory

backup_git_repos.sh

#!/bin/bash
set -eu
src_root=$1
dst_root=$2
max_depth=${3:-5}
cd $src_root
for repo in $(find . -maxdepth $max_depth -type d -name .git); do
  repo=$(dirname $repo)
  echo "backup $repo"
  dst_repo=$dst_root/${repo}.git
  [ -d $dst_repo ] || ( mkdir -p $dst_repo && git clone --mirror $repo $dst_repo )
  git --git-dir $dst_repo remote update
done