#!/bin/sh
-. git-sh-setup || die "Not a git archive"
-tag=$(git-rev-parse $1) || exit 1
+GIT_DIR=`git-rev-parse --git-dir` || exit $?
+
+die () {
+ echo >&2 "$*"
+ exit 1
+}
+
+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."
+
+git-cat-file tag "$1" >"$GIT_DIR/.tmp-vtag" || exit 1
+cat "$GIT_DIR/.tmp-vtag" |
+sed '/-----BEGIN PGP/Q' |
+gpg --verify "$GIT_DIR/.tmp-vtag" - || exit 1
+rm -f "$GIT_DIR/.tmp-vtag"
-git-cat-file tag $tag > .tmp-vtag || exit 1
-cat .tmp-vtag | sed '/-----BEGIN PGP/Q' | gpg --verify .tmp-vtag - || exit 1
-rm -f .tmp-vtag