Re: Using conditionals in embedded config?

[Shea Levy]

I'm setting up an unassisted android boot process, where I first check 
to see if the system has requested boot into recovery and boot from the 
recovery bootimg if so (booting from the normal bootimg otherwise). None 
of the traditional android partitions are appropriate for a grub config. 
I can just add an extra partition (which I'm doing for now), but a) this 
is not supported by official flashing/update mechanisms and b) this 
increases the window during an update to the bootloader where loss of 
power would result in a corrupt system (with embedded config doing all 
of the work, I only need to update boot.img and core.img, with a config 
on a separate partition I also need to update that partition.

~Shea

On 2016-02-06 08:59, Andrei Borzenkov wrote:
> 06.02.2016 15:28, Shea Levy пишет:
> > I see. This seems to severely limit the possible use cases of 
> > embedded
> > configs; it also contradicts the example in the manual [1]. Is there
>
> Yes, someone already complained about manual. Patches are welcome.
>
> > really no way to branch in embedded configs? Would it be possible to
> > enable branching by including some optional module in the core img?
>
> Why do you need to do it in the first place? What is your use case?
>
> > ~Shea
> >
> > [1]
> >
> > https://www.gnu.org/software/grub/manual/html_node/Embedded-configuration.html#Embedded-configuration
> >
> > On 2016-02-06 00:42, Andrei Borzenkov wrote:
> > > 06.02.2016 06:24, Shea Levy пишет:
> > > > Hi all,
> > > >
> > > > How can I use if statements in an embedded config? When I try, I 
> > > > get
> > >
> > > You can't. embedded config is processed early using rescue mode 
> > > parser
> > > which is very simple. Embedded config exists to locate device where 
> > > grub
> > > is installed in case this information is not available from 
> > > firmware.
> > > Everything else cam be done using grub.cfg in this location.
> > >
> > > > "unknown command "if"", "unknown command "fi"", etc. I'm including
> > > > normal, part_gpt, android_bootimg, android_bcb, linux, test, and
> > > > biosdisk in the core.img (the android_* modules are local 
> > > > modifications,
> > > > see the grub-devel list for their details but they shouldn't 
> > > > matter).
> > > >
> > > > Thanks,
> > > > Shea
> > > >
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