Re: Possible to Embed GRUB Font File into Binary?

[Andrey Borzenkov]

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В Tue, 27 May 2014 19:28:39 -0400
SevenBits <address@hidden> пишет:

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> On 05/27/2014 03:48 PM, Jordan Uggla wrote:
> > On Sun, May 25, 2014 at 9:29 AM, SevenBits
> > <address@hidden> wrote:
> >> Okay, so I've tried this out and I am having difficulties. GRUB
> >> does not seem to be able to access any of the commands in the
> >> included modules. When I boot into GRUB, a bunch of errors
> >> scrolls past on the screen too quickly to read (though they
> >> appear to be about missing commands) and then I end up in the
> >> GRUB normal prompt.
> >> 
> >> I've using the exact same configuration file that I'm using with 
> >> grub-mkimage, except it doesn't work this time. I recall seeing 
> >> something a while ago saying that modules are not automatically
> >> loaded when using grub-mkstandalone. If that's the case, then how
> >> would I activate them? When I get dropped into the prompt and
> >> type something like `insmod linux` it responds by saying that the
> >> module Linux was not found, even though I gave the command for it
> >> to be included.
> >> 
> >> I've attached my grub.cfg file that I'm using. Perhaps someone
> >> could advise me as to what I'm doing wrong?
> > 
> > From your grub.cfg: set prefix=''
> > 
> > $prefix is the variable used by grub to find its modules, by
> > setting it to the empty string you prevent grub from being able to
> > find the modules.
> 
> Oh, duh. Not sure how that got in there.
> 
> I'm having some additional issues now. Essentially, when GRUB is
> loaded from a memdisk in this manner, the root is set to the memdisk.
> Which is fine, except for one problem. I need to be able to get the
> device that the EFI executable file is currently residing on, because
> I need to set up loopback for an ISO file located in the same
> directory as the GRUB EFI image. When I generated the image using
> grub-mkimage, the root was set to this device, so this was not a problem.
> 
> This URL ( https://wiki.archlinux.org/index.php/Grub#GRUB_Standalone )
>  suggests using a variable called ${cmdpath} to solve this.
> Unfortunately, the variable is not defined in my configuration.
> 

Which grub version do you use? cmdpath is available post-2.00 (should
be in 2.02beta2).

> I cannot hard-code the path to use (i.e hd1,msdos0) because this
> portable GRUB copy is meant to be put onto a USB stick and booted on
> users' computers. Hard-coding the path would be ineffective because my
> users could for example have multiple hard drives, meaning that my
> hard-coded path might not point to the USB that I want and instead
> point to some other drive entirely, or a non-existent drive.
> 
> This is where my limited knowledge of GRUB internals is coming into
> play. Is there some easy way to get the device that the image being
> run is contained on?
> 

That's the reason for cmdpath - to export this information. Note that
patch itself is rather trivial and can easily be backported. It is
commit 1fe26ab4a0fc6ec961b661cc7fc9227db822c9be.

> Should I do the same for the linux command as well, e.g should
> 
> linux ${var} quiet splash ... --
> 
> become
> 
> linux "${var} quiet splash ... --"
> 

No. This will result in both grub and kernel getting single argument
which is probably not what you expect.
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