From 72be6dafa18d318e1db6f824da30f8705fe37ae9 Mon Sep 17 00:00:00 2001
From: martin <martin@NetBSD.org>
Date: Tue, 1 May 2018 08:17:13 +0000
Subject: [PATCH] Make the "gpt header" command return EXIT_FAILURE when no GPT
 is present. This helps sysinst to tell a GPT labeled disk from others. Very
 lazy version of a change proposed by kre.

---
 sbin/gpt/gpt.8    | 8 +++++++-
 sbin/gpt/header.c | 4 ++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/sbin/gpt/gpt.8 b/sbin/gpt/gpt.8
index 2f8bff9c090d..03a322e0da98 100644
--- a/sbin/gpt/gpt.8
+++ b/sbin/gpt/gpt.8
@@ -1,4 +1,4 @@
-.\" $NetBSD: gpt.8,v 1.59 2018/04/11 07:13:18 mrg Exp $
+.\" $NetBSD: gpt.8,v 1.60 2018/05/01 08:17:13 martin Exp $
 .\"
 .\" Copyright (c) 2002 Marcel Moolenaar
 .\" All rights reserved.
@@ -735,6 +735,12 @@ xotica# installboot /dev/rdk0 /usr/mdec/bootxx_ffsv1
 xotica# mount /dev/dk0 /mnt
 xotica# cp /usr/mdec/boot /mnt
 .Ed
+.Sh EXIT STATUS
+The
+.Nm
+command exits with a failure status (1) when the header command
+is used and no GPT header is found.
+This can be used to check for the existance of a GPT in shell scripts.
 .Sh SEE ALSO
 .Xr boot 8 ,
 .Xr dkctl 8 ,
diff --git a/sbin/gpt/header.c b/sbin/gpt/header.c
index c4973d5d57bd..6e61465cb900 100644
--- a/sbin/gpt/header.c
+++ b/sbin/gpt/header.c
@@ -33,7 +33,7 @@
 
 #include <sys/cdefs.h>
 #ifdef __RCSID
-__RCSID("$NetBSD: header.c,v 1.8 2015/12/24 17:35:57 martin Exp $");
+__RCSID("$NetBSD: header.c,v 1.9 2018/05/01 08:17:13 martin Exp $");
 #endif
 
 #include <sys/types.h>
@@ -83,7 +83,7 @@ header(gpt_t gpt)
 	map = map_find(gpt, MAP_TYPE_PRI_GPT_HDR);
 	if (map == NULL) {
 		printf("- GPT Header not found\n");
-		return 0;
+		return -1;
 	}
 
 	hdr = map->map_data;