Re: refind: account for btrfs setups when generating manual stanzas

[slymattz <slymattz@users.noreply.github.com>]

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New comment by slymattz on void-packages repository

https://github.com/void-linux/void-packages/pull/48906#issuecomment-1998168969

Comment:
@ahesford @sgn is this PR mergable?

If I were to argue for the merge, I'd say that not only does it introduce sgn's patch that fixes aarch64 build, but it also makes necessary changes in the post-install kernel hook. So far, the hook has only been able to generate entries that work with EFI mounted in /boot. I'm really surprised no one ever raised this issue before. 

![refind-path](https://github.com/void-linux/void-packages/assets/76883004/57451059-9571-487c-9e75-ef74ebb4bbd7)
Source: https://wiki.archlinux.org/title/REFInd#For_manual_boot_stanzas

Given what I said before, I would even argue that the defaults could be `REFIND_CONF=/boot/efi/EFI/refind/refind.conf` and `REFIND_BOOT_PREFIX=/boot` since this is the standard approach of keeping kernels as part of the ROOTFS filesystem. Mounting the EFI part in /boot/efi (as opposed to /boot) is also recommended in the official Void docs. Although some people do store kernels on the EFI partition, I doubt whether this is a standard approach.

Looking forward to hearing from you guys :)