Allow fdisk(8) to add GPT partitions of protected types.

This makes it possible to provision virtual machine images that
need a "BIOS Boot" partition.

Report, original diff and testing by Christian Ludwig. Thanks!

ok miod@

diff --git a/sbin/fdisk/cmd.c b/sbin/fdisk/cmd.c
index c1765db..f18123f 100644 (file)
--- a/sbin/fdisk/cmd.c
+++ b/sbin/fdisk/cmd.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: cmd.c,v 1.179 2023/11/18 15:42:09 krw Exp $   */
+/*     $OpenBSD: cmd.c,v 1.180 2024/03/01 17:48:03 krw Exp $   */
 
 /*
  * Copyright (c) 1997 Tobias Weingartner
@@ -294,6 +294,7 @@ Xedit(const char *args, struct mbr *mbr)
 int
 gsetpid(const int pn)
 {
+       int32_t                  is_nil;
        uint32_t                 status;
 
        GPT_print_parthdr(TERSE);
@@ -305,8 +306,9 @@ gsetpid(const int pn)
                return -1;
        }
 
+       is_nil = uuid_is_nil(&gp[pn].gp_type, NULL);
        gp[pn].gp_type = *ask_uuid(&gp[pn].gp_type);
-       if (PRT_protected_uuid(&gp[pn].gp_type)) {
+       if (PRT_protected_uuid(&gp[pn].gp_type) && is_nil == 0) {
                printf("can't change partition type to %s\n",
                    PRT_uuid_to_desc(&gp[pn].gp_type));
                return -1;