[Bug 260281] etcupdate: dry-run (-n) causes following actual run to skip changes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260281

            Bug ID: 260281
           Summary: etcupdate: dry-run (-n) causes following actual run to
                    skip changes
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: junchoon@dec.sakura.ne.jp

Doing `etcupdate -n` itself runs OK, but following `etcupdate -B` does
NOT do anything, hence nothing is actually updated.
The only workaround I have is NOT to try dry-run.

This would be caused by any commit done in april 2021 on main (MFC'ed to
stable/13 in june 2021).
It would be because the same trees are used for dry-run and actual run.
(Not looked into the code. Just a thought.)

Maybe using dedicated trees (older one is copied from actual current
one, building current tree on dedicated place and delete them every
time the dry-run finishes) for dry-run would fix.

And copying /etc to some temporary place and applying changes to it,
copy back to /etc may be help for your issue, I think.

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