#!/bin/sh

# abuild-sign - sign indexes
# Copyright (c) 2009 Natanael Copa <ncopa@alpinelinux.org>
#
# Distributed under GPL-2
#

abuild_ver=@VERSION@
datadir=@datadir@

if ! [ -f "$datadir/functions.sh" ]; then
	echo "$datadir/functions.sh: not found" >&2
	exit 1
fi
. "$datadir/functions.sh"

do_sign() {
	local f i keyname repo

	# we are actually only interested in the name, not the file itself
	keyname=${pubkey##*/}

	for f; do
		i=$(readlink -f $f)
		[ -d "$i" ] && i="$i/APKINDEX.tar.gz"
		repo="${i%/*}"
		(
		set -e
		cd "$repo"
		sig=".SIGN.RSA.$keyname"
		openssl dgst -sha1 -sign "$privkey" -out "$sig" "$i"
		tmptargz=$(mktemp)
		tar -c "$sig" | abuild-tar --cut | gzip -9 > "$tmptargz"
		tmpsigned=$(mktemp)
		cat "$tmptargz" "$i" > "$tmpsigned"
		rm -f "$tmptargz" "$sig"
		chmod 644 "$tmpsigned"
		mv "$tmpsigned" "$i"
		if [ -z "$quiet" ]; then
			echo "Signed $i"
		fi
		) || die "Failed to sign $i"
	done
}

usage() {
	cat >&2 <<__EOF__
$prog $abuild_ver - sign indexes
Usage: $prog [-k PRIVKEY] [-p PUBKEY] INDEXFILE...
Options:
  -k, --private KEY  The private key to use for signing
  -p, --public KEY   The name of public key. apk add will look for /etc/apk/keys/KEY
  -q, --quiet
  -h, --help         Show this help

__EOF__
}

privkey="$PACKAGER_PRIVKEY"
pubkey=
quiet=

args=`getopt -o k:p:qh --long private:,public:,quiet,help -n "$prog" -- "$@"`
if [ $? -ne 0 ]; then
	usage
	exit 2
fi
eval set -- "$args"
while true; do
	case $1 in
		-k|--private) privkey=$2; shift;;
		-p|--public) pubkey=$2; shift;;
		-q|--quiet) quiet=1;; # suppresses msg
		-h|--help) usage; exit;;
		--) shift; break;;
		*) exit 1;; # getopt error
	esac
	shift
done
if [ $# -eq 0 ]; then
	usage
	exit 2
fi

if [ -z "$privkey" ]; then
	cat >&2 << __EOF__
No private key found. Use 'abuild-keygen' to generate the keys.
Then you can either:
  * set the PACKAGER_PRIVKEY in $abuild_userconf
    ('abuild-keygen -a' does this for you)
  * set the PACKAGER_PRIVKEY in $abuild_conf
  * specify the key with the -k option to $prog

__EOF__
	exit 1
fi

if [ -z "$pubkey" ]; then
	pubkey=${PACKAGER_PUBKEY:-"${privkey}.pub"}
fi

do_sign "$@"
exit 0