[Bug 210803] installerconfig: bsdinstall zfsboot requires ZFSBOOT_DISKS or it fails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210803

            Bug ID: 210803
           Summary: installerconfig: bsdinstall zfsboot requires
                    ZFSBOOT_DISKS or it fails
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: laurieodgers83 at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I am currently setting up a scripted interactive install using installerconfig
for a ZFS-on-root install of Freebsd 10.3.

The preamble of installerconfig appears to work perfectly fine - hostname is
set, network is set up, ZFS datasets are created and mounted to /mnt etc,
however if I don't set "ZFSBOOT_DISKS=ada0" within installerconfig then the
installation shows an error message at the very end and does not proceed with
my installerconfig script: "No root partition was found. The root FreeBSD
partition must have a mountpoint of '/'." 

The installer then kicks me to a login prompt of the live CD instead of
proceeding with the rest of the installerscript.

Note that all ZFS datasets are set up correctly and mounted - I am unsure why
the installer is complaining that nothing is mounted? I do not want to have to
set ZFS_BOOT_DISKS= as the user should be able to set this up themselves
interactively.

The preamble to my installerconfig is as follows:

##############################
export DISTRIBUTIONS="base.txz kernel.txz lib32.txz"
export BSDINSTALL_CONFIGCURRENT="yes"
export BSDINSTALL_DISTDIR="/usr/freebsd-dist/"
export BSDINSTALL_CHROOT="/mnt"
export VAR_NONINTERACTIVE="NO"
export ZFSBOOT_DISKS=""

export ZFSBOOT_DATASETS="
    # DATASET           OPTIONS (comma or space separated; or both)

    # Boot Environment [BE] root and default boot dataset
    /ROOT               mountpoint=none
    /ROOT/default       mountpoint=/

    # Compress /tmp, allow exec but not setuid
    /tmp                mountpoint=/tmp,exec=on,setuid=off

    # Don't mount /usr so that 'base' files go to the BEROOT
    /usr                mountpoint=/usr,canmount=off

    # Home directories separated so they are common to all BEs
    /usr/home           # NB: /home is a symlink to /usr/home

    # Ports tree
    /usr/ports          setuid=off

    # Source tree (compressed)
    /usr/src

    # Create /var and friends
    /var                mountpoint=/var,canmount=off
    /var/audit          exec=off,setuid=off
    /var/crash          exec=off,setuid=off
    /var/log            exec=off,setuid=off
    /var/mail           atime=on
    /var/tmp            setuid=off

    # Create /tredly and friends
    /tredly                                 mountpoint=/tredly
    /tredly/downloads                       mountpoint=/tredly/downloads
    /tredly/log                             mountpoint=/tredly/log
    /tredly/releases                        mountpoint=/tredly/releases
    /tredly/ptn                             mountpoint=/tredly/ptn

    # set up the releases datasets so that tredly init runs correctly during
install
    /tredly/downloads/10.3-RELEASE         
mountpoint=/tredly/downloads/10.3-RELEASE
    /tredly/releases/10.3-RELEASE          
mountpoint=/tredly/releases/10.3-RELEASE

    # set up the default partition
    /tredly/ptn/default                     mountpoint=/tredly/ptn/default
    /tredly/ptn/default/cntr                mountpoint=/tredly/ptn/default/cntr
    /tredly/ptn/default/data                mountpoint=/tredly/ptn/default/data
    /tredly/ptn/default/log                 mountpoint=/tredly/ptn/default/log
    /tredly/ptn/default/psnt                mountpoint=/tredly/ptn/default/psnt
    /tredly/ptn/default/remotecontainers   
mountpoint=/tredly/ptn/default/remotecontainers
"
export ZFSBOOT_BEROOT_NAME=ROOT
export ZFSBOOT_BOOTFS_NAME=default
export ZFSINTERACTIVE=true

bsdinstall keymap
bsdinstall hostname
bsdinstall zfsboot
bsdinstall checksum
bsdinstall distextract
bsdinstall netconfig
bsdinstall config

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