Bug#928750: - Bug in grubx64.efi triggered by shim?

[Steve McIntyre]

Hi Michael!

On Mon, May 13, 2019 at 10:34:46AM +0200, Michael Kesper wrote:
>
>Is it possible that the erroneous behaviour of grubx64.efi (not loading its config
>files when being loaded by bootnetx64.efi aka shim-signed) gets triggered by
>how the shim calls grubx64?
>With Debian 9, the same setup (boot the installer via UEFI PXE) worked.
>
>References:
>  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=928750
>  https://lists.debian.org/debian-boot/2019/05/msg00076.html
>  https://lists.debian.org/debian-boot/2019/05/msg00084.html

Ah. Apologies, you've clearly found a bug in our setup. :-(

It looks like what you're seeing is that the signed grub image is
using a different $prefix setting, and now it needs help to find the
grub.cfg file.

The debian-installer build used to rebuild its own grub EFI image and
change some config during that build (using -p
"$netboot_prefix/grub"), but now we can't do that (as it would lose
the signature). We need to update our netboot tree and the
documentation to reflect this.

-- 
Steve McIntyre, Cambridge, UK.                                steve at einval.com
"Because heaters aren't purple!" -- Catherine Pitt