bug#27605: Lightweight desktop example fails to build with kernel panic

[Leo Famulari <leo@famulari.name>]

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On Fri, Jul 07, 2017 at 02:23:05PM +0200, Ludovic Courtès wrote:
> Did you pass --image-size?  If not, it could be that the image size
> estimate is slightly too small (see commit
> a8ac4f081a9a679498ea42ccfe001f218bba3043).
> 
> The build log should contain something like:
> 
>   creating ~a image of ~,2f MiB...
> 
> where ~a is “raw” or “qcow2” depending on the “guix system” command you
> used.
> 
> Could you check what happens if you pass a --image-size argument bigger
> than that?

I doubled it from ~10 GiB to ~20 GiB:

> creating qcow2 image of 19359.59 MiB...

This example template uses EFI, which I'm not that familiar with. But I
suspect something about the bootloader or filesystems configuration is
wrong.

From 'gnu/system/examples/lightweight-desktop.tmpl':

  ;; Use the UEFI variant of GRUB with the EFI System
  ;; Partition on /dev/sda1.
  (bootloader (grub-configuration (grub grub-efi)
                                  (device "/dev/sda1")))

  ;; Assume the target root file system is labelled "my-root".
  (file-systems (cons* (file-system
                         (device "my-root")
                         (title 'label)
                         (mount-point "/")
                         (type "ext4"))
                       (file-system
                         ;; Specify partition here since FAT 
                         ;; labels are currently unsupported.
                         (device "/dev/sda1")
                         (mount-point "/boot/efi")
                         (type "vfat"))
                       %base-file-systems))

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