[Bug 281456] makefs zfs is tricky to get right with multiple partitions, matching freebsd install default

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 12 Sep 2024 09:53:32 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281456

            Bug ID: 281456
           Summary: makefs zfs is tricky to get right with multiple
                    partitions, matching freebsd install default
           Product: Base System
           Version: 14.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: pat@patmaddox.com

freebsdinstall creates a layout similar to:

zroot: /zroot
  ROOT: none
    default: /
  home: /home
  var: /var
(etc)

It took quite a while for me to work out how to do it with makefs... I tended
to cycle between assertion error and usage errors.

I looked at the tests and based on multi_dataset_2_body was able to come up
with:

makefs -t zfs -s 10g -o rootpath=/ -o poolname=zroot -o
fs=zroot/ROOT\;mountpoint=none -o fs=zroot/ROOT/default\;mountpoint=/ -o
fs=zroot\;mountpoint=/zroot -o fs=zroot/home\;mountpoint=/home -o
bootfs=zroot/ROOT/default  main.zfs /pdt/images/15-main-d82cb5c608ae/

I'm not quite sure what the path forward would be. Maybe it's possible to have
this be more liberal in the order it receives args - or maybe the man pages
should explain the order requirements.

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