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#!/bin/zsh
D=${1:-~/service}
[[ -d $D ]] || { echo 'invalid service directory:' $D; exit 1 }

DSEC_WAIT=10

if [[ -o xtrace ]]; then
	usv.check() { zsh -x ${commands[usv.check]} "$@" }
fi

touch $D/lock
(
	flock -w 5 3
	if ! usv.check $D; then
		(
			flock -u 3
			setsid usv.run $D 2>&1 | logger -t svdir.${${D:t}##.} &>/dev/null
		)  3</dev/null &!
		while ! usv.check $D; do
			DSEC_WAIT=$(( DSEC_WAIT - 1 ))
			sleep '0.1s'
			if ! (($DSEC_WAIT)); then
				print >&2 "failed to spawn runsvdir in: $D"
				exit 1
			fi
		done
	fi
) 3<$D/lock