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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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31
disk/part_efi.c
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@@ -178,6 +178,37 @@ static void prepare_backup_gpt_header(gpt_header *gpt_h)
* Public Functions (include/part.h)
*/
/*
* UUID is displayed as 32 hexadecimal digits, in 5 groups,
* separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
*/
int get_disk_guid(struct blk_desc * dev_desc, char *guid)
{
ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
gpt_entry *gpt_pte = NULL;
unsigned char *guid_bin;
/* This function validates AND fills in the GPT header and PTE */
if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
if (is_gpt_valid(dev_desc, dev_desc->lba - 1,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid Backup GPT ***\n",
__func__);
return -EINVAL;
} else {
printf("%s: *** Using Backup GPT ***\n",
__func__);
}
}
guid_bin = gpt_head->disk_guid.b;
uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
return 0;
}
void part_print_efi(struct blk_desc *dev_desc)
{
ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);