Zfs automatically creates directories needed to be mounted, it would be a
wasted effort making directories for zfs. I don't really understand your
issue with an unused /usr dataset, but you can just modify
the ZFSBOOT_DATASETS area of the script to get accomplish what you're
trying to do.

On Wed, Mar 9, 2016 at 8:02 PM, Freddie Cash <fjwc...@gmail.com> wrote:

> On Mar 9, 2016 4:04 PM, "Miroslav Lachman" <000.f...@quip.cz> wrote:
> >
> > Roger Marquis wrote on 03/10/2016 00:36:
> >>
> >> Wondering if anyone has example patches for zfsboot (from
> >> usr.sbin/bsdinstall/scripts)?
> >>
> >> We're looking to change some of the default zfs subvolumes, removing
> /usr in
> >> favor of /usr/local in particular, and have run into a "parent does not
> exist"
> >> issue.  It's not clear where in the script the /usr parent dir should be
> >> mkdir'd.
> >
> >
> > I no nothing about this script but if you want /usr/local as ZFS
> filesystem, then you need to create parent (/usr in this case) and you can
> use property canmount=off plus different 'mountpoint' (for example
> /mnt/usr) to not mount /usr over existing directory on root filesystem.
>
> Set mountpoint=none if you just want to create the parent dataset without
> actually using it for storage. Then you can set properties on it, and child
> datasets will inherit then. Like pool/usr/local
>
> You'd still need to "mkdir /usr" in the script, but that's separate.
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