GPT: add accessor function for disk GUID
In order to read the GPT, modify the partition name strings, and then
write out a new GPT, the disk GUID is needed. While there is an
existing accessor for the partition UUIDs, there is none yet for the
disk GUID.
Changes since v6: none.
Signed-off-by: Alison Chaiken <alison@peloton-tech.com>
diff --git a/cmd/gpt.c b/cmd/gpt.c
index 3e98821..65fb80b 100644
--- a/cmd/gpt.c
+++ b/cmd/gpt.c
@@ -398,6 +398,23 @@
return ret;
}
+static int do_disk_guid(struct blk_desc *dev_desc, char * const namestr)
+{
+ int ret;
+ char disk_guid[UUID_STR_LEN + 1];
+
+ ret = get_disk_guid(dev_desc, disk_guid);
+ if (ret < 0)
+ return CMD_RET_FAILURE;
+
+ if (namestr)
+ setenv(namestr, disk_guid);
+ else
+ printf("%s\n", disk_guid);
+
+ return ret;
+}
+
/**
* do_gpt(): Perform GPT operations
*
@@ -436,6 +453,8 @@
} else if ((strcmp(argv[1], "verify") == 0)) {
ret = gpt_verify(blk_dev_desc, argv[4]);
printf("Verify GPT: ");
+ } else if (strcmp(argv[1], "guid") == 0) {
+ ret = do_disk_guid(blk_dev_desc, argv[4]);
} else {
return CMD_RET_USAGE;
}
@@ -458,4 +477,11 @@
" Example usage:\n"
" gpt write mmc 0 $partitions\n"
" gpt verify mmc 0 $partitions\n"
+ " guid <interface> <dev>\n"
+ " - print disk GUID\n"
+ " guid <interface> <dev> <varname>\n"
+ " - set environment variable to disk GUID\n"
+ " Example usage:\n"
+ " gpt guid mmc 0\n"
+ " gpt guid mmc 0 varname\n"
);