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

[Lukasz Majewski <lukma@denx.de>]

Hi Sam,

> Hi Tom,
> 
> We have broken fastboot right now... Can we please apply this series,
> so that it appears in v2019.07?

I'm running Travis-CI on this series, and send PR to Marek when it
finish.

Thanks for fixing fastboot.

> 
> Thanks!
> 
> On Thu, Jun 13, 2019 at 12:14 AM 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)
> > --
> > 2.20.1
> >  
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Best regards,

Lukasz Majewski

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