There's a closed pull request on the void-packages repository

Improve consistency of relative paths in kernel hooks
https://github.com/void-linux/void-packages/pull/24079

Description:
Motivated by a breakage in the `dracut` removal hook as called from `vkpurge`, I cleaned up several packages that install kernel hooks to try to make their behavior more consistent. The XBPS trigger runs hooks from the target root directory with `ROOTDIR` set, so hooks should accommodate this if possible. `vkpurge` now changes to `/` and sets `ROOTDIR` to make sure any hooks it calls work as expected. It would be good to verify correct operation of all hooks after these changes, but `dkms` and `dracut` seem to be the most critical.

- [x] base-files
- [x] dkms
- [x] dracut
- [ ] gummiboot
- [ ] mkinitcpio
- [x] refind
- [x] sbsigntool

**Note 1**: `dracut` now uses `--sysroot .` to (hopefully) operate properly in a relative environment.

**Note 2**: `dkms` makes a lot of assumptions about running in the system root that are trickier to override, and the hook already made a lot of absolute path references, so I went all-in on absolute paths in the `dkms` hooks.

Affected maintainers: @Gottox @q66 @thypon @sgn
General interest: @ericonr @duncaen