A bash script to search and replace git remotes in multiple git repositories

bulk-update-git-remotes.sh

#!/bin/bash -eu
# Update the git remotes on git working copies contained in the given parent folder.
#
# usage: bulk-update-git-remotes.sh <path containing git repo(s)> <remote search> <remote replace>
#
# e.g. bulk-update-git-remotes.sh ~/git github.com/foo gitlab.com/bar

dryrun=0

while getopts ":n" opt; do
  case $opt in
    n)
      dryrun=1
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
  esac
done

shift $((OPTIND-1))

basedir=${1:-}
search=${2:-}
replace=${3:-}

if [ -z "$basedir" -o -z "$search" -o -z "$replace" ]; then
	echo "usage: $0 <basedir> [<search> <replace>]" >&2
	exit 1
fi

if [ $dryrun != 0 ]; then
	echo "Dry run..." >&2
fi

find "$basedir" -maxdepth 2 -type d -name '.git' -prune | sort | while read git ; do
	git=$(dirname "$git")
	remotes=$(git -C "$git" remote)

	for remote in $remotes ; do
		giturl=$(git -C "$git" remote get-url $remote)

		if [ -n "$search" ]; then
			if [[ $giturl = *$search* ]]; then
				newgiturl=${giturl/$search/$replace}
				echo "$git: $remote: $giturl => $newgiturl"

				if [ $dryrun == 0 ]; then
					git -C "$git" remote set-url $remote "$newgiturl" "$giturl"
				fi
			fi
		fi
	done
done