#!/bin/sh

# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.

main()
{
	# Handle opts
	while getopts ":hi:t:" opt
	do
		case "$opt" in
			h) usage && exit 0 ;;
			i) DOCKER_IMAGE="$OPTARG" ;;
			t) DOCKER_TAG="$OPTARG" ;;
			*)
				printf "Invalid option passed: %s\n" "$OPTARG" >&2
				;;
		esac
	done

	shift $(( OPTIND - 1 ))

	[ -z "$DOCKER_IMAGE" ] && DOCKER_IMAGE="alpine"
	[ -z "$DOCKER_TAG" ] && DOCKER_TAG="latest"

	kubectl run "shell-$(uuidgen)" \
		--image "$DOCKER_IMAGE:$DOCKER_TAG" \
		--restart=Never \
		--rm \
		--stdin \
		--tty \
		"$@" \
		-- /bin/sh
}

usage()
{
	cat <<EOF
Usage:
	${0##*/} -h

Shorthand to spawn a single pod with an interactive shell into your Kubernetes
cluster.

Options:
	-h  Show this help text and exit.
EOF
}

main "$@"