cvs tag renaming after repo copy

[John Hein]

Amol Dharmadhikar i ???? ?? ???? ????? wrote at 11:47 -0800 on Feb 27, 2008:
 > On Wed, Feb 27, 2008 at 11:21 AM, John Hein <jhein at timing.com> wrote:
 > >  I don't want to move the tag... I want to invalidate old tags by
 > >  renaming them to something else (like foo-1-2-3 -> old_foo-1-2-3).
 > >
 > >  Note that just using cvs to rename a tag (by tagging with the new name
 > >  and then removing the former name) has issues when you try to do that
 > >  with branch tags.
[*]
 > >
 > >  Anyway, I'm pretty sure the FreeBSD cvs-meisters run something to
 > >  invalidate tags after doing a repo copy.  That's the information I was
 > >  looking for.
 > >
 > 
 > I dont think you can rename tags using a single command. What you can
 > do instead is create a new tag at the same point as the old tag, and
 > then delete the old tag.
 > 
 > eg -
 > cvs rtag -r old-foo-1-2-3 new-foo-1-2-3 <module_name>
 > cvs rtag -d old-foo-1-2-3 <module_name>

Yes, I mentioned that above [*].
You can't do that with branch tags.
You can use cvs admin -n or -N with branch tags.

Anyway, I'm wondering if anyone has a script which iterates over
existing tags and renames them to old_*.  Maybe that will make
it more clear what I'm looking for?