#!/bin/sh

setvar USAGE = ''<tag>''
setvar SUBDIRECTORY_OK = ''Yes''
source git-sh-setup

setvar verbose = ''
while test $# != 0
{
	case (1) {
	-v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose {
		setvar verbose = 't' }
	* {
		break }
	}
	shift
}

if test "$Argc" != "1"
{
	usage
}

setvar type = "$(git cat-file -t "$1" 2>/dev/null)" ||
	die "$1: no such object."

test $type = tag ||
	die "$1: cannot verify a non-tag object of type $type."

case (verbose) {
t {
	git cat-file -p $1 |
	sed -n -e '/^-----BEGIN PGP SIGNATURE-----/q' -e p
	}
}

trap 'rm -f "$GIT_DIR/.tmp-vtag"' 0

git cat-file tag $1 >"$GIT_DIR/.tmp-vtag" || exit 1
sed -n -e '
	/^-----BEGIN PGP SIGNATURE-----$/q
	p
' <"$GIT_DIR/.tmp-vtag" |
gpg --verify "$GIT_DIR/.tmp-vtag" - || exit 1
rm -f "$GIT_DIR/.tmp-vtag"