clean up old versions of vagrant boxes

vagrant-box-clean

#!/usr/bin/env bash

##### Functions

# print this script's usage message to stderr
usage() {
	cat <<-EOF >&2
	usage: vagrant-box-clean [-p PREFIX] [-d] [-h]
	EOF
}

# print this script's help message to stdout
help() {
	cat <<-EOF

	NAME
	     vagrant-box-clean -- clean up old versions of vagrant boxes

	SYNOPSIS
	     vagrant-box-clean [options...]

	DESCRIPTION

	     vagrant-box-clean will remove your stale vagrant boxes, leaving just
	     the most recent version of each box. To list all of your existing
	     boxes, use the command "vagrant box list".

	OPTIONS
	     -p, --prefix=PREFIX
	            only remove boxes named with this prefix

	     -d, --dry-run
	            print the commands that would run, but do not execute

	     -h, --help
	            view this help message

	AUTHOR
	     Aaron Bull Schaefer <aaron@elasticdog.com>

	EOF
}


##### Main

# reset all variables that might be set
prefix=''
dry_run=''

# parse command line options
while [[ "$1" != '' ]]
do
	case $1 in
		-p | --prefix)
			prefix=$2
			shift
			;;
		--prefix=*)
			prefix=${1#*=}
			;;
		-d | --dry-run)
			dry_run='true'
			;;
		-h | --help | -\?)
			help
			exit 0
			;;
		--*)
			usage
			exit 1
			;;
		*)
			usage
			exit 1
			;;
	esac
	shift
done

# escape forward slashes
prefix=${prefix//\//\\/}

# cache the current vagrant box listing
tempfile=$(mktemp /tmp/vagrant-box-clean.XXXXXX)
trap 'rm -f "$tempfile"' EXIT
vagrant box list > "$tempfile"

for box_name in $(awk "/^$prefix/{ print \$1 }" "$tempfile" | sort | uniq); do
	# remove all versions of $box_name except for the most recent
	while IFS= read -r box; do
		box_version=$(echo "${box//[\(\)]/}" | awk '{ print $3 }')

		if [[ $dry_run ]]; then
			echo vagrant box remove --force --box-version="${box_version}" "${box_name}"
		else
			vagrant box remove --force --box-version="${box_version}" "${box_name}"
		fi
	done < <(grep "$box_name" "$tempfile" | sed '$d')
done

exit 0

vagrant box prune will also take care of this for you