[Bug 240893] Add ZFS Detection to fstyp(8) Tool

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240893

            Bug ID: 240893
           Summary: Add ZFS Detection to fstyp(8) Tool
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: vermaden at interia.pl

Output from 12.1-BETA1:

# fstyp /dev/md0
fstyp: /dev/md0: filesystem not recognized

ZFS is not detected. Either imported or exported.

This is quick and easy way to detect ZFS on a block device:

# head -c 32000 /dev/md0 | strings | grep -q pool_guid

Dunno how that may help with fstyp(8) written in C but ...  :)

Regards.

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