#!/bin/sh

. ${CIRROS_LIB:=/lib/cirros/shlib_cirros} ||
	{ echo "failed to read ${CIRROS_LIB}" 1>&2; exit 1; }

Usage() {
	cat <<EOF
Usage: ${0##*/} [ options ] frequency name cmd [args]

   run cmd with given arguments for the given frequency.
   frequency is:
     always:    run every time
     always-ds: run every time, but only if there is a datasource
     boot:      run only once per boot
     instance:  run once per instance (first boot)
     once:      run once ever (first boot with or without datasource)
   name is the name of this thing.  subsequent runs of will be
     run with the given frequency based on state kept in 'name'
   
   options:
        --dry-run  : only report, do not update results
   -v | --verbose  : be more verbose
EOF
}

cirros_per() {
	local short_opts="hv"
	local long_opts="help,dry-run,verbose"
	local getopt_out=""
	getopt_out=$(getopt --name "${0##*/}" \
		--options "${short_opts}" --long "${long_opts}" -- "$@") &&
		eval set -- "${getopt_out}" ||
		{ bad_Usage; return; }

	local dryrun=false cur="" next="" VERBOSITY="$VERBOSITY"
	local freq="" name="" state_d="" marker=""

	while [ $# -ne 0 ]; do
		cur=${1}; next=${2};
		case "$cur" in
			-h|--help) Usage ; exit 0;;
			-v|--verbose) VERBOSITY=$((${VERBOSITY}+1));;
		   	   --dry-run) dryrun=true;;
			--) shift; break;;
		esac
		shift;
	done
	[ $# -ge 3 ] || { bad_Usage "must provide frequency, name, cmd"; return; }

	freq="$1"
	name="$2"
	shift 2;

	[ ! -r "$CONFIG" ] || . "$CONFIG" ||
		fail "failed to read $CONFIG"

	case "$freq" in
		always)
			state_d="${STATE_D}";
			marker="always.always.${name}"
			;;
		always-ds)
			state_d="${STATE_D}";
			marker="always-ds.always.${name}"
			assert_datasource ||
				{ error "no datasource found"; return 1; }
			;;
		instance)
			state_d="${STATE_D}";
			ds_get_item "instance-id" ||
				{ error "failed to get instance-id of datasource"; return 1; }
			iid="${_RET}"
			marker="instance.${iid}.${name}"
			;;
		once)
			state_d="${STATE_D}";
			marker="once.once.${name}"
			;;
		boot)
			state_d="${BOOT_STATE_D}"
			marker="boot.boot.${name}"
			;;
		*) fail "bad frequency $freq";;
	esac

	debug 2 "using state_dir=${state_d}, marker=${marker}"

	[ -d "$state_d" ] || mkdir -p "$state_d" ||
		{ error "failed to create state_dir ${state_d}"; return 1; }

	if [ "${freq#always}" = "$freq" -a -f "${state_d}/${marker}" ]; then
		{ error "${name} already run per ${freq}"; return 0; }
	fi

	if $dryrun; then
		error "run" "$@"
		return 0
	fi

	local ret=0 uptime="" idle=""
	debug 2 "[$freq]" "$@"
	"$@"
	ret=$?

	read_uptime
	echo "[${_RET}]" "$@" > "${state_d}/${marker}"

	return "$ret"
}

cirros_per "$@"

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