Growing the root filesystem on first boot

[Drew DeVault <sir%cmpwn.com@localhost>]

Hiya! I'm writing some scripts to automate the creation of bootable
NetBSD images. I build the image as a small raw disk so it can be
mounted via vndconfig, then convert it to qcow2 and resize it. The goal
is that these images are self-hosting: qcow2's are sparse, so I can
resize the disk to the size of the host disk without any issues, which
isn't possible with raw images.

However, I want the system to resize the root filesystem to fill the
remaining disk space on first boot. This works with growfs_enable=YES in
rc.conf on FreeBSD, but resize_root=YES on NetBSD doesn't seem to do the
trick. Any advice?

My script for building NetBSD images is here and is designed to be run
on a NetBSD host:

https://git.sr.ht/~sircmpwn/builds.sr.ht/tree/master/images/netbsd/genimg

--
Drew DeVault