bug#47780: [installer] Trying to install to DVD leads to crash

[Ludovic Courtès]

Hello!

I’ve run an installation with:

  qemu-img create -f qcow2  /tmp/img.qcow2 2G
  qemu-system-x86_64 -enable-kvm -m 2048 \
    -cdrom /gnu/store/…-image.iso -hda /tmp/img.qcow2 \
    -boot d

where the image was obtained by running:

  guix system disk-image -t iso9660 --label=GUIX_x86_64-linux_1.2.1 \
    gnu/system/install.scm

The installer would propose me two target storage devices: hard disk and
CD/DVD.  I mistakenly chose the latter, which led to a crash (screenshot
attached).

Possible improvements are:

  1. gracefully handling this error;
  2. filtering out read-only storage devices from the menu.

Thoughts?

(This is with commit 863bd265e458d2761906770802716555c54e69a4.)

Ludo’.