generic-x86_64: mkinitfs fails if i915 firmware is not installed

Describe your issue

What's the expected behaviour?

mkinitfs works

What's the current behaviour?

13:28:45.117879 -- Including files from: /usr/share/mkinitfs/files/30-gpu-firmware.files
13:28:45.117907 hookfiles: unable to process hook file "/usr/share/mkinitfs/files/30-gpu-firmware.files": unable to add "/lib/firmware/i915": getFile: failed to stat file "/lib/firmware/i915": stat /lib/firmware/i915: no such file or directory (also tried "/lib/firmware/i915.zst": stat /lib/firmware/i915.zst: no such file or directory)

and then it aborts

How to reproduce your issue?

mkinitfs without i915 firmware installed

What device are you using?

generic-x86_64

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v24.06

• I confirm that the issue still is present after running sudo apk upgrade -a

Additional information

This is a regression from !5527 (merged).

Workaround: sudo rm /usr/share/mkinitfs/files/30-gpu-firmware.files

@craftyguy: I guess the best fix would be renaming it to 30-gpu-firmware-i915.files and only installing it conditionally if the firmware is actually present, with install_if?