[Bug 221854] makefs: Reject UFS labels that are too long to fit

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221854

            Bug ID: 221854
           Summary: makefs: Reject UFS labels that are too long to fit
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fk at fabiankeil.de
             Flags: mfc-stable11?

Created attachment 185810
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185810&action=edit
makefs: Reject UFS labels that are too long to fit

If a specified UFS label is too long to fit, makefs currently silently
truncates it.

This causes problems if the created file system contains files like
/etc/fstab that expect the whole label.

You may end up with a release image that was built "successfully"
but doesn't actually boot.

The attached patch lets makefs reject UFS labels that don't fit which
makes the issue easier to spot.

Obtained from: ElectroBSD

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