I'm trying to write a grub.cfg file that will add a menu entry that
boots a Linux kernel from the default subvolume of a btrfs partition.
My problem is that I don't seem to be able to find a way to access the
default subvolume of said partition.
In my case the partition is (hd0,gpt2).
The default subvolume is set to "@/.snapshots/1/snapshot".
The kernel is located at /boot/vmlinuz-linux of the beforementioned
subvolume.
(hd0,gpt2)/ points to subvolume 5 of the btrfs partition and not to the
default subvolume.
Therefore the location of the kernel would be:
(hd0,gpt2)/@/.snapshots/1/snapshot/boot/vmlinuz-linux
My questions would be as follows:
1. Does GRUB provide a way to access the default subvolume of a btrfs
partition instead of subvolume 5?
2. Is there a way for GRUB to store the path of the default subvolume of
a btrs partition to a variable (so I can then manually prepend it to the
kernel path like in the above example)?
I tried searching online but someone created a project named
"grub-btrfs" and it makes searching for actual information on grub's
btrfs support quite inconvenient.
Thanks
