abump: verify APKBUILD's version

abump.in

@@ -37,6 +37,12 @@ do_bump() {
 		. "$a" || exit 1
 		[ "$pkgname" = "$name" ] || die "$name: APKBUILD has different \$pkgname"
 		type package | grep -q function || die "$name: missing package()"
+		case $(apk version --test "$pkgver" "$ver") in
+		'=') die "$pkgname: already at version $pkgver";;
+		'>') die "$pkgname: already at newer version $pkgver";;
+		'<') exit 0;;
+		*) exit 1;;
+		esac
 		) || { rc=1; continue; }
 
 		(