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GPT: add accessor function for disk GUID

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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>
This commit is contained in:
Alison Chaiken
2017-06-25 16:43:23 -07:00
committed by Tom Rini
parent e6faf21f25
commit 73d6d18b71
4 changed files with 74 additions and 1 deletions
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26
cmd/gpt.c
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@ -398,6 +398,23 @@ static int gpt_verify(struct blk_desc *blk_dev_desc, const char *str_part)
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 @@ static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
} 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 @@ U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
" 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"
);