#!/bin/sh

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

echo $sigs | while read 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