ckup

#!/bin/sh
# ckup - check for new openbsd version and download new sets

arch="$(sysctl -n hw.machine)"
directory="${HOME}/.$(basename ${0})"
mirror='ftp://ftp3.usa.openbsd.org/pub/OpenBSD'
version='snapshots'
url="${mirror}/${version}/${arch}"

if [ ! -e "${directory}" ]; then
	mkdir -p "${directory}"
fi

cd "${directory}"

ftp -aiMVo "${directory}"/SHA256.new "${url}"/SHA256

if cmp -s "${directory}"/SHA256 "${directory}"/SHA256.new; then
	rm "${directory}"/SHA256.new
	echo 'No changes.'
else
	echo 'Updates found. Downloading new sets...'
	mv "${directory}"/SHA256.new "${directory}"/SHA256
	ftp -aiV "${url}"/{INSTALL*,SHA256.sig,*tgz,bsd*}
	doas cp "${directory}"/bsd.rd /bsd.rd
	echo "/bsd.rd updated; new sets downloaded to ${directory}."
fi