Shell script to delete useless build tags from GitHub forks of YUI 3

delete-tags.sh

#!/bin/bash

# This script will delete *all* local and remote tags from any git repo you run
# it in that begin with "yui3-". Please use it to remove the hundreds of
# build tags from your YUI 3 fork.
#
# This script will not delete branches; just tags.

set -e

REMOTE='origin'

# Verify that we have git 1.7.x.
if [ `git --version | grep "version 1\.7" | wc -l` == "0" ]; then
    echo "This script requires git 1.7.x."
    echo
    exit 1
fi

echo "--> Cleaning up tags"

# First, delete all old local tags.
git tag -d `git tag | grep "yui3-" | xargs`

# Now fetch all remote tags so we'll know which ones to delete.
git fetch --tags $REMOTE
tags=`git tag | grep "yui3-" | xargs`

# Delete all old remote tags.
if [ "$tags" != "" ]; then
    git push -v --delete $REMOTE $tags
fi

# Re-delete all old local tags.
git tag -d $tags

echo "--> Done"