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gpt: support random UUIDs without setting environment variables

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Currently, an environment variable must be used to store the randomly
generated UUID for each partition. This is not necessary, so make storing
the UUID optional. Now passing uuid_disk and uuid are optional when random
UUIDs are enabled.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
This commit is contained in:
Rob Herring 2015-01-26 09:44:18 -06:00 committed by Tom Rini
parent a150e6c9df
commit 0c7e8d1317
2 changed files with 35 additions and 21 deletions
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48
common/cmd_gpt.c
View file

@ -154,17 +154,24 @@ static int set_gpt_info(block_dev_desc_t *dev_desc,
/* extract disk guid */
s = str;
tok = strsep(&s, ";");
val = extract_val(tok, "uuid_disk");
val = extract_val(str, "uuid_disk");
if (!val) {
#ifdef CONFIG_RANDOM_UUID
*str_disk_guid = malloc(UUID_STR_LEN + 1);
gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
#else
free(str);
return -2;
#endif
} else {
val = strsep(&val, ";");
if (extract_env(val, &p))
p = val;
*str_disk_guid = strdup(p);
free(val);
/* Move s to first partition */
strsep(&s, ";");
}
if (extract_env(val, &p))
p = val;
*str_disk_guid = strdup(p);
free(val);
if (strlen(s) == 0)
return -3;
@ -192,20 +199,25 @@ static int set_gpt_info(block_dev_desc_t *dev_desc,
/* uuid */
val = extract_val(tok, "uuid");
if (!val) { /* 'uuid' is mandatory */
if (!val) {
/* 'uuid' is optional if random uuid's are enabled */
#ifdef CONFIG_RANDOM_UUID
gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
#else
errno = -4;
goto err;
#endif
} else {
if (extract_env(val, &p))
p = val;
if (strlen(p) >= sizeof(parts[i].uuid)) {
printf("Wrong uuid format for partition %d\n", i);
errno = -4;
goto err;
}
strcpy((char *)parts[i].uuid, p);
free(val);
}
if (extract_env(val, &p))
p = val;
if (strlen(p) >= sizeof(parts[i].uuid)) {
printf("Wrong uuid format for partition %d\n", i);
errno = -4;
goto err;
}
strcpy((char *)parts[i].uuid, p);
free(val);
/* name */
val = extract_val(tok, "name");
if (!val) { /* name is mandatory */

8
doc/README.gpt
View file

@ -157,11 +157,13 @@ To restore GUID partition table one needs to:
"partitions=uuid_disk=${uuid_gpt_disk};name=${uboot_name},
size=${uboot_size},uuid=${uboot_uuid};"
Fields 'name', 'size' and 'uuid' are mandatory for every partition.
The fields 'name' and 'size' are mandatory for every partition.
The field 'start' is optional.
option: CONFIG_RANDOM_UUID
If any partition "UUID" no exists then it is randomly generated.
The fields 'uuid' and 'uuid_disk' are optional if CONFIG_RANDOM_UUID is
enabled. A random uuid will be used if omitted or they point to an empty/
non-existent environment variable. The environment variable will be set to
the generated UUID.
2. Define 'CONFIG_EFI_PARTITION' and 'CONFIG_CMD_GPT'