#!/bin/sh

#
# Generally, utilities that I expected to exist in POSIX, but don't.
#

uuid() {
	# Taken from:
	# https://serverfault.com/a/799198
	od -xN20 /dev/urandom |
		head -1 |
		awk '{OFS="-"; print $2$3,$4,$5,$6,$7$8$9}'
}

tmpname() {
	echo 'mkstemp(template)' | m4 -D template="${TMPDIR:-/tmp}/m4-tmpname."
}

mkstemp() {
	name="$(tmpname)"
	touch "$name"
	echo "$name"
}

mkdtemp() {
	name="$(tmpname)"
	rm -f "$name"
	mkdir "$name"
	echo "$name"
}