[Bug 249413] bectl - should manipulate canmount on child datasets of the root instead of relying on /etc/rc.d/zfsbe

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249413

--- Comment #3 from Anton Saietskii <vsasjason@gmail.com> ---
(In reply to cmh from comment #2)

> It should simply set canmount as documented (i.e. between noauto and on as appropriate) and rely on the normal boottime zfs mounting mechanism.
Let's imagine that you have 2 BEs, each with subdataset:
zroot/ROOT/default
zroot/ROOT/default/var
and
zroot/ROOT/upgrade
zroot/ROOT/upgrade/var

Of course, each pair _needs_ to be mounted, but the mountpoints are the same.
When you will boot to default, which one var will you get mounted if this will
be performed automatically?

> Therefore, if I do a zfs list -o name,canmount and see that the dataset is set to noauto, I should trust it will not be mounted at boot time.
But I totally agree with this.

Perhaps using a custom property indicating BEs will be better.

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