# Functions used from inside of initrd.


# Wait for specific /dev files to appear but only one
# time regardless how often this function is called
# in one initrd run. Needs writable /tmp.
wait_for_files() {
	local i=0 timeout=30 all_found not_found wff_dir fpath file
	while getopts t: opt "$@"; do
		case "$opt" in
			t)
				timeout="${OPTARG}"
				break
				;;
			*)
				echo "$0: wait_for_files: unknown option" >&2
				return 1
				;;
		esac
	done
	shift $((OPTIND - 1))

	wff_dir="/tmp/wait_for_files"

	[ ! -d "$wff_dir" ] && mkdir "$wff_dir"

	echo "Waiting for files ($@) with ${timeout}s timeout"
	i=0
	timeout=$((timeout * 4))
	while [ $i -lt $timeout ]; do
		all_found=1
		for file in $@; do
			fpath="$wff_dir/${file}"
			[ -e "$fpath" -o -e "$file" ] && continue
			all_found=0
		done
		if [ $all_found -eq 1 ]; then
			return 0
		fi
		usleep 250000
		i=$((i + 1 ))
	done
	not_found=""
	# mark files that we have waited for
	for file in $@; do
		fpath="$wff_dir/${file}"
		[ ! -e "$fpath" ] && mkdir -p "$fpath"
		[ ! -e "$file" ] && not_found="$not_found $file"
	done
	echo "Waiting for files ($@) finished. Missing files: $not_found"

	return 0
}