#!/bin/sh

# Copyright: Thomas Preud'homme (2011)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

if [ $# -ne 1 ] ; then
	echo "Usage:"
	echo "	$0 <gpg_key>"
	echo "<gpg_key> can be either string that identifies a GPG key: key"
	echo "ID, fingerprint, UID, etc. (see 'HOW TO SPECIFY A USER ID' in"
	echo "the gpg's manpage)."
	exit 1
fi

sigs=$(gpg --with-colons --check-sigs "$1" \
	| grep "sig:\!" \
	| sed -r "s/sig:\!::[[:digit:]]+:([[:alnum:]]+):.*$/\1/")

echo "$sigs" | while read -r key
	do
		gpg --no-default-keyring --keyring /usr/share/keyrings/debian-keyring.gpg --list-keys "$key" 2>/dev/null \
			| grep "debian.org" \
			| grep "^uid" \
			| sed -r "s/^uid +//" \
			| sort -d \
			| uniq
	done