bug#66746: LUKS password prompt invisible, prompts twice

[Saku Laesvuori]

> Hi Caleb,
> 
> Caleb Herbert <csh@bluehome.net> writes:
> 
> > Hardware: ThinkPad X200
> > Firmware: Libreboot 2016
> > OS: Guix System
> >
> > Expected behavior:
> > Password prompt. Enter LUKS passphrase. Log into computer.
> >
> > Actual behavior:
> > Password prompt. Enter LUKS passphrase. Select boot option from GRUB menu. 
> > Hangs, no password prompt. Enter passphrase (again) anyway: Boots normally.
> 
> I think this is a combination of two things: first, we currently need to
> unlock the drive once for GRUB, and then once when Linux boots, hence
> the two password prompts.  This is a known limitation, but the usual
> workaround of adding a keyfile to the initrd wouldn't work in our case
> for security reasons: the keyfile would end up in the store and be
> world-readable, a disaster.

I believe a patch[1] enabling this is waiting for a review.

[1]: https://issues.guix.gnu.org/65002

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