Logic fault in setup-alpine (BTRFS boot partition)

export BOOTFS=btrfs export ROOTFS=btrfs setup-alpine

According to https://wiki.alpinelinux.org/wiki/Alpine\_setup\_scripts, BTRFS should be supported as filesystem for all options (BOOTFS,ROOTFS and VARFS).

However, setup-alpine is lacking the intelligence to increase the size of /boot if BTRFS requested.

If you proceed through the setup, you encounter the following fatal message :

ERROR: ‘/dev/sda1’/ is too small to make a usable filesystem
ERROR: minimum size for each btrfs device is 114294784

(from redmine: issue id 9343, created on 2018-08-27)