[U-Boot] [PATCH v2 3/3] fastboot: Check if partition really exist in getvar_has_slot()

[Lukasz Majewski <lukma@denx.de>]

On Thu, 13 Jun 2019 00:14:11 +0300
Sam Protsenko <semen.protsenko@linaro.org> wrote:

> From: Igor Opaniuk <igor.opaniuk@toradex.com>
> 
> Currently getvar_has_slot() invocation for "boot" and "system"
> partitions always returns affirmative response regardless the fact of
> existence of these partitions, which leads to impossibility to flash
> them on old non-A/B AOSP setups, where _a/_b suffixes aren't used:
> 
> $ fastboot flash boot boot.img
> Sending 'boot__a' (11301 KB)    OKAY [  0.451s]
> Writing 'boot__a'               FAILED (remote: 'cannot find
> partition') fastboot: error: Command failed
> 
> Although partition layout is:
> -> part list mmc 0  
> Partition Map for MMC device 0  --   Partition Type: EFI
> 
> Part	Start LBA	End LBA		Name
> 	Attributes
> 	Type GUID
> 	Partition GUID
>   1	0x00000800	0x000107ff	"boot"
> 	attrs:	0x0000000000000000
> 	type:	ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
> 	guid:	ea2e2470-db4a-d646-b828-10167f736d63
>   2	0x00010800	0x000127ff	"environment"
> 	attrs:	0x0000000000000000
> 	type:	ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
> 	guid:	10a819d2-6004-3d48-bd87-114e2a796db9
>   3	0x00012800	0x0001a7ff	"recovery"
> 	attrs:	0x0000000000000000
> 	type:	ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
> 	guid:	9ea116e4-8a34-0c48-8cf5-2fe9480f56cd
>   4	0x0001a800	0x0031a7ff	"system"
> 	attrs:	0x0000000000000000
> ......
> 
> This patch adds checks of existence for requested partitions
> on eMMC/NAND.
> 
> Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> ---
>  drivers/fastboot/fb_getvar.c | 26 ++++++++++++++++++++++----
>  1 file changed, 22 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/fastboot/fb_getvar.c
> b/drivers/fastboot/fb_getvar.c index b23880089e..563bda0088 100644
> --- a/drivers/fastboot/fb_getvar.c
> +++ b/drivers/fastboot/fb_getvar.c
> @@ -179,11 +179,29 @@ static void getvar_slot_suffixes(char
> *var_parameter, char *response) 
>  static void getvar_has_slot(char *part_name, char *response)
>  {
> -	if (part_name && (!strcmp(part_name, "boot") ||
> -			  !strcmp(part_name, "system")))
> +	char part_name_wslot[PART_NAME_LEN];
> +	size_t len;
> +	int r;
> +
> +	if (!part_name)
> +		goto no;
> +
> +	/* Append "_a" prefix to part_name */
> +	len = strlcpy(part_name_wslot, part_name, PART_NAME_LEN - 3);
> +	if (len > PART_NAME_LEN - 3) {
> +		fastboot_fail("too long partition name", response);
> +		return;
> +	}
> +	strcat(part_name_wslot, "_a");
> +
> +	/* Check if this partition exists */
> +	r = getvar_get_part_info(part_name_wslot, response, NULL);
> +	if (r >= 0) {
>  		fastboot_okay("yes", response);
> -	else
> -		fastboot_okay("no", response);
> +		return;
> +	}
> +no:
> +	fastboot_okay("no", response);
>  }
>  
>  #if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)

Reviewed-by: Lukasz Majewski <lukma@denx.de>


Best regards,

Lukasz Majewski

--

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