[U-Boot] [PATCH v4 5/6] cmd:gpt: randomly generate each partition uuid if undefined

[Stephen Warren <swarren@wwwdotorg.org>]

On 03/19/2014 11:58 AM, Przemyslaw Marczak wrote:
> Changes:
> - randomly generate partition uuid if any is undefined and CONFIG_RAND_UUID
>   is defined
> - print debug info about set/unset/generated uuid
> - update doc/README.gpt
> 
> Update existing code to the new library functions.

The changelog should be below the --- line, and a patch description
should exist.

Assuming the comments below are fixed,
Acked-by: Stephen Warren <swarren@nvidia.com>

> diff --git a/common/cmd_gpt.c b/common/cmd_gpt.c

> -static char extract_env(const char *str, char **env)
> +static int extract_env(const char *str, char **env)
>  {
> +	int ret = -1;
>  	char *e, *s;
> -
> +#ifdef CONFIG_RANDOM_UUID
> +	char uuid_str[UUID_STR_LEN + 1];
> +#endif
>  	if (!str || strlen(str) < 4)

The blank line needs to be after the #endif not before the #ifdef, so
the variable declarations are separate from the code.

>  		return -1;
>  
> -	if ((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')) {
> -		s = strdup(str);
> -		if (s == NULL)
> -			return -1;
> -		memset(s + strlen(s) - 1, '\0', 1);
> -		memmove(s, s + 2, strlen(s) - 1);
> +	if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
> +		return -1;

Since you're inverting that test, you need to change && to || too.

> diff --git a/doc/README.gpt b/doc/README.gpt
> index 5c133f3..51515c8 100644
> --- a/doc/README.gpt
> +++ b/doc/README.gpt
> @@ -101,7 +101,7 @@ Offset  Size    Description
>  40      8 B     First usable LBA for partitions (primary partition table last
>  		LBA + 1)
>  48      8 B     Last usable LBA (secondary partition table first LBA - 1)
> -56      16 B    Disk GUID (also referred as UUID on UNIXes)
> +56      16 B    Disk GUID (also referred as UUID on UNIXes) in big endian

According to your earlier comment, GUIDs have a mix of LE and BE fields,
so I would simply drop this change and the similar change below. Let
wikipedia or the comment you added near to top of lib/uuid.c specify the
details.

> @@ -160,6 +160,9 @@ To restore GUID partition table one needs to:
>     Fields 'name', 'size' and 'uuid' 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.

s/"uuid"/UUID/