[Bug 235831] [FEATURE REQUEST] [ZFS] Option to **non-destructively** import ZFS pool at checkpoint (i.e., keep the checkpoint)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235831

            Bug ID: 235831
           Summary: [FEATURE REQUEST] [ZFS] Option to
                    **non-destructively** import ZFS pool at checkpoint
                    (i.e., keep the checkpoint)
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: stilezy at gmail.com

The ZPOOL feature "zpool import --rewind-to-checkpoint POOLNAME" was recently
added - thank you! But there's a slight omission which I hope is easy to add.

Rewinding to a checkpoint is always a destructive act - the checkpoint is
destroyed by the "import --rewind-to-checkpoint" command. 

If testing, it is extremely useful to [create checkpoint -> test -> rewind ->
test -> rewind] multiple times, to compare the behaviour with different
options. At present one has to re-checkpoint, but the recheckpoint loses the
date.

FEATURE REQUEST

Is it possible to add a variant "--rewind-to-checkpoint-no-discard" or
"--rewind-to-checkpoint -k" (for keep), that simply skips the call to destroy
the checkpoint, after rewind + import has completed?


EFFECT:

It's possible to rewind to a checkpoint **without** destroying the checkpoint
in  the process.

Thanks

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