[Bug 256535] swapon nukes non FreeBSD swap file systems

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256535

            Bug ID: 256535
           Summary: swapon nukes non FreeBSD swap file systems
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: bz@FreeBSD.org

Hi,

if one repurposes a FreeBSD swap file system for another file system (e.g. 2nd
system) or mistyypes the partition in fstab
and FreeBSD boots with that swap in fstab, swapon -a will nuke that file system
even if it is no longer a freebsd-swap in GPT
(no idea about MBR anymore).
It seems to be a good idea to put in a check, warn and let the user fix this
rather than simply activating swap and with
that likely nuking a file system there..
It's probably a bit tricky to find all the cases but it should be fairly easy
to test in a VM so..

#BeginnersTask

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