From owner-freebsd-sysinstall@freebsd.org  Wed Dec 23 20:27:54 2015
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Subject: [Bug 204506] bsdinstall(8) umount target should be able to unmount
 zfs filesystems
Date: Wed, 23 Dec 2015 20:27:53 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204506

--- Comment #4 from Allan Jude <allanjude@FreeBSD.org> ---
I think you want to use:


zfs unmount $BSDINSTALL_CHROOT

To only unmount anything mounted under /mnt

Also, you should first check if any ZFS was actually used, as running a zfs
command for the first time loads the ZFS kernel module, and you don't want to
do that if the user just did a ufs only install

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