A few corrections and a related random thought.
* The original --not "refs/tags/*:refs/tags/backup/*" fooled me. As
my primary point was that an earlier change to fast-export made
the uninteresting bottom not appear as reset in the output
stream, I omitted everything after colon without much thought.
If the current fast-export does not let you say "refs/tags/*" to
export all the tags, we do not have to extend it to allow it to
do so.
* On the other hand, "git log 'fc/*'" might be a handy thing for
any command that wants to have multiple starting points for
revision traversal, so in principle I would not mind such an
enhancement to rev-list machinery.
But that does not have to be part of this series.
* I alluded to the similarity between fast-export and bundle,
meaning to hint that "git bundle" might also benefit from being
able to say "record these refs under different name", but after
thinking about it a bit more, I think it is unnecessary.
The user of the bundle's output, either fetch or clone, can use
the usual refspec mapping to use the data in any way it wants.
If the bundle says refs/heads/master is at one commit, the _user_
of that bundle can decide to map it to refs/remotes/origin/master
(or refs/heads/origin, for that matter).
It is a very powerful concept that we can generate data once,
cast it in stone, and delay the decision on _how_ it is used
until the last minute, much better than mapping at export time.
So bundle does not need a similar refspec mechanism to map what
it exports. I haven't thought things through to see if the same
logic applies to fast-export output (if so, it would mean it is
better to allow the consumer of the stream take the refspec
parameter and map the tips it finds in its input), though.
Junio C Hamano <gitster@pobox.com>