-# i don't change the default subvolid, so the arg here is just being cautious
-e mount -o subvolid=0 $boot_disk$grub_extn $mount_point
-e grub-editenv $mount_point/grubenv set last_boot=/boot_$distro
+e mount $boot_disk$grub_extn $mount_point
+e grub-editenv $mount_point/grubenv set last_boot=/$distro