#!/usr/bin/env bash
# 2018 Luke Shumaker
declare -r NAME=osi-run
declare -r VERSION=20180812

set -euE
source "${BASH_SOURCE[0]%/*}/lib/osi.sh"

main() {

	local arg_mode=main
	local arg_mountpoint=
	local arg_image=
	local arg_qemu=(
		qemu-system-x86_64
		-machine accel=kvm
		-m 512
	)

	local args
	if ! args="$(getopt -n "${0##*/}" -o hV -l help,version -- "$@")"; then
		arg_mode=error
	else
		eval "args=($args)"
		set -- "${args[@]}"
		while true; do
			case "$1" in
				-V|--version) shift; arg_mode=version;;
				-h|--help) shift; arg_mode=usage;;
				--) shift; break;;
				*) error 1 'Internal error.  The programmer writing this tool screwed up.';;
			esac
		done
		case "$arg_mode" in
			main)
				if (( $# != 1 )); then
					if (( $# == 0 )); then
						error 0 "Expected 1 positional argument, got none"
					else
						error 0 "Expected 1 positional argument, got %d: %s" "$#" "${*@Q}"
					fi
					arg_mode=error
				else
					arg_image=$1
				fi
				;;
		esac
	fi
	case "$arg_mode" in
		error) print "Try '%q --help' for more information" "${0##*/}" >&2; return 2;;
		version)
			print "%s (notsystemd) %s" "$NAME" "$VERSION"
			return 0
			;;
		usage)
			print 'Usage: %s [OPTIONS] FILENAME.img < SCRIPT.sh' "${0##*/}"
			print 'Operating System Image: Run Script'
			echo
			print 'OPTIONS:'
			print '  -h, --help     display this help'
			print '  -V, --version  output version information'
			return 0
			;;
		main)
			arg_mountpoint=$(mktemp -dt -- "${0##*/}.XXXXXXXXXX")
			trap "rmdir -- ${arg_mountpoint@Q}" EXIT
			sudo -- ./osi-mount --root -- "$arg_image" "$arg_mountpoint" "install -Dm755 /dev/stdin ${arg_mountpoint@Q}/etc/osi-run"
			"${arg_qemu[@]}" \
			     -name "osi-run $arg_image" \
			     -drive media=disk,format=raw,if=virtio,file="$arg_image"
			sudo -- ./osi-mount --user -- "cat ${arg_mountpoint@Q}/var/log/osi-run.out; exit \$(cat ${arg_mountpoint@Q}/var/log/osi-run.status)"
			;;

		*) error 1 'Internal error.  The programmer writing this tool screwed up.';;
	esac
}

main "$@"