libfdisk: add generic function to set disklabel ID

Signed-off-by: Karel Zak <kzak@redhat.com>

fdisks/fdisk-menu.c

@@ -134,8 +134,10 @@ struct menu menu_gpt = {
 	.label = FDISK_DISKLABEL_GPT,
 	.entries = {
 		MENU_XSEP(N_("GPT")),
-		MENU_XENT('u', N_("change partition UUID")),
+		MENU_XENT('i', N_("change disk GUID")),
 		MENU_XENT('n', N_("change partition name")),
+		MENU_XENT('u', N_("change partition UUID")),
+
 		{ 0, NULL }
 	}
 };
@@ -389,6 +391,9 @@ static int gpt_menu_cb(struct fdisk_context *cxt,
 
 	DBG(FRONTEND, dbgprint("enter GPT menu"));
 
+	if (ent->key == 'i')
+		return fdisk_set_disklabel_id(cxt);
+
 	rc = fdisk_ask_partnum(cxt, &n, FALSE);
 	if (rc)
 		return rc;

fdisks/fdisk.c

@@ -425,8 +425,7 @@ expert_command_prompt(struct fdisk_context *cxt)
 			fdisk_create_disklabel(cxt, "sgi");
 			break;
 		case 'i':
-			if (fdisk_is_disklabel(cxt, DOS))
-				dos_set_mbr_id(cxt);
+			fdisk_set_disklabel_id(cxt);
 			break;
 		case 'p':
 			list_table(cxt, 1);

fdisks/fdiskdoslabel.c

@@ -480,13 +480,18 @@ static int dos_create_disklabel(struct fdisk_context *cxt)
 	return 0;
 }
 
-int dos_set_mbr_id(struct fdisk_context *cxt)
+static int dos_set_disklabel_id(struct fdisk_context *cxt)
 {
 	char *end = NULL, *str = NULL;
 	unsigned int id, old;
-	struct fdisk_dos_label *l = self_label(cxt);
+	struct fdisk_dos_label *l;
 	int rc;
 
+	assert(cxt);
+	assert(cxt->label);
+	assert(fdisk_is_disklabel(cxt, DOS));
+
+	l = self_label(cxt);
 	old = mbr_get_id(cxt->firstsector);
 	rc = fdisk_ask_string(cxt,
 			_("Enter of the new disk identifier"), &str);
@@ -1808,6 +1813,7 @@ static const struct fdisk_label_operations dos_operations =
 	.create		= dos_create_disklabel,
 	.list		= dos_list_disklabel,
 	.get_id		= dos_get_disklabel_id,
+	.set_id		= dos_set_disklabel_id,
 
 	.part_add	= dos_add_partition,
 	.part_delete	= dos_delete_partition,

fdisks/fdiskdoslabel.h

@@ -7,9 +7,6 @@ extern struct dos_partition *fdisk_dos_get_partition(
 				struct fdisk_context *cxt,
 				size_t i);
 
-extern void dos_print_mbr_id(struct fdisk_context *cxt);
-extern int dos_set_mbr_id(struct fdisk_context *cxt);
-
 extern void dos_fix_partition_table_order(struct fdisk_context *cxt);
 extern void dos_move_begin(struct fdisk_context *cxt, int i);
 extern void dos_toggle_active(struct fdisk_context *cxt, int i);

libfdisk/src/fdiskP.h

@@ -150,6 +150,8 @@ struct fdisk_label_operations {
 	int (*list)(struct fdisk_context *cxt);
 	/* get disk label ID */
 	int (*get_id)(struct fdisk_context *cxt, char **id);
+	/* set disk label ID */
+	int (*set_id)(struct fdisk_context *cxt);
 
 	/* new partition */
 	int (*part_add)(struct fdisk_context *cxt,

libfdisk/src/gpt.c

@@ -1791,6 +1791,49 @@ static int gpt_get_disklabel_id(struct fdisk_context *cxt, char **id)
 	return 0;
 }
 
+static int gpt_set_disklabel_id(struct fdisk_context *cxt)
+{
+	struct fdisk_gpt_label *gpt;
+	struct gpt_guid uuid;
+	char *str, *old, *new;
+	int rc;
+
+	assert(cxt);
+	assert(cxt->label);
+	assert(fdisk_is_disklabel(cxt, GPT));
+
+	gpt = self_label(cxt);
+	if (fdisk_ask_string(cxt,
+			_("Enter new disk UUID (in 8-4-4-4-12 format)"), &str))
+		return -EINVAL;
+
+	rc = string_to_guid(str, &uuid);
+	free(str);
+
+	if (rc) {
+		fdisk_warnx(cxt, _("Failed to parse your UUID."));
+		return rc;
+	}
+
+	gpt_get_disklabel_id(cxt, &old);
+
+	gpt->pheader->disk_guid = uuid;
+	gpt->bheader->disk_guid = uuid;
+
+	gpt_recompute_crc(gpt->pheader, gpt->ents);
+	gpt_recompute_crc(gpt->bheader, gpt->ents);
+
+	gpt_get_disklabel_id(cxt, &new);
+
+	fdisk_info(cxt, _("Changing disk identifier from %s to %s."), old, new);
+
+	free(old);
+	free(new);
+	fdisk_label_set_changed(cxt->label, 1);
+	return 0;
+}
+
+
 static struct fdisk_parttype *gpt_get_partition_type(
 		struct fdisk_context *cxt,
 		size_t i)
@@ -1894,8 +1937,10 @@ int fdisk_gpt_partition_set_uuid(struct fdisk_context *cxt, size_t i)
 	rc = string_to_guid(str, &uuid);
 	free(str);
 
-	if (rc)
+	if (rc) {
+		fdisk_warnx(cxt, _("Failed to parse your UUID."));
 		return rc;
+	}
 
 	e = &gpt->ents[i];
 
@@ -1985,6 +2030,7 @@ static const struct fdisk_label_operations gpt_operations =
 	.create		= gpt_create_disklabel,
 	.list		= gpt_list_disklabel,
 	.get_id		= gpt_get_disklabel_id,
+	.set_id		= gpt_set_disklabel_id,
 
 	.part_add	= gpt_add_partition,
 	.part_delete	= gpt_delete_partition,

libfdisk/src/label.c

@@ -249,10 +249,27 @@ int fdisk_get_disklabel_id(struct fdisk_context *cxt, char **id)
 	if (!cxt->label->op->get_id)
 		return -ENOSYS;
 
-	DBG(LABEL, dbgprint("asking for %s ID", cxt->label->name));
+	DBG(LABEL, dbgprint("asking for disk %s ID", cxt->label->name));
 	return cxt->label->op->get_id(cxt, id);
 }
 
+/**
+ * fdisk_get_disklabel_id:
+ * @cxt: fdisk context
+ *
+ * Returns 0 on success, otherwise, a corresponding error.
+ */
+int fdisk_set_disklabel_id(struct fdisk_context *cxt)
+{
+	if (!cxt || !cxt->label)
+		return -EINVAL;
+	if (!cxt->label->op->set_id)
+		return -ENOSYS;
+
+	DBG(LABEL, dbgprint("setting %s disk ID", cxt->label->name));
+	return cxt->label->op->set_id(cxt);
+}
+
 /**
  * fdisk_get_partition_type:
  * @cxt: fdisk context

libfdisk/src/libfdisk.h

@@ -125,6 +125,7 @@ extern int fdisk_create_disklabel(struct fdisk_context *cxt, const char *name);
 extern int fdisk_list_disklabel(struct fdisk_context *cxt);
 
 extern int fdisk_get_disklabel_id(struct fdisk_context *cxt, char **id);
+extern int fdisk_set_disklabel_id(struct fdisk_context *cxt);
 
 extern int fdisk_add_partition(struct fdisk_context *cxt, struct fdisk_parttype *t);
 extern int fdisk_delete_partition(struct fdisk_context *cxt, size_t partnum);