[Bug 234954] fsck -T flag suffers from ufs/ffs filesystem type ambiguity

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234954

            Bug ID: 234954
           Summary: fsck -T flag suffers from ufs/ffs filesystem type
                    ambiguity
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: ian at FreeBSD.org

The fsck(8) -T option is used to route options to the filesystem-specific
programs it runs.  The fsck(8) wrapper program gleans the name of the
filesystem type from a variety of sources... on the commandline, from fstab,
from geom info, etc.  From some sources of info it decides a filesystem is ufs,
from other sources it translates ufs to ffs.

This means that you can't reliably specify either -T ufs: or -T ffs: and be
sure that the option will take effect.  fsck(8) should probably translate
everything (-T names and filesystem type names) to either ufs or ffs, but after
poking around a bit in the code, it appears that this translation has to happen
in many scattered locations.

A workaround is available, by specifying the option(s) you want twice, using
both of the filesystem type names.

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