Re: cvs2git reports a "sprout" from a nonexistent commit?

Robert Haas <robertmhaas@gmail.com> writes:
> ...  I am not sure there is really
> much point in keeping these ancient branches and tags.  I'd argue for
> losing all branches and tags that don't start with REL except perhaps
> for PG95-1_01.  Nobody's going to care about those anyway, and in the
> very unlikely event that they do, they can refer back to CVS.

Well, my original opinion was pretty much that; but we are close enough
to having the complete history in the git conversion that I would like
to be able to say that we won't need the CVS repository any more after
we convert.

I'm currently down to three unexplainable oddities: these two commits
related to the Release_2_0 and Release_2_0_0 tags, and the branch point
for the REL2_0B branch.  The latter situation looks like this:

commit 2032a1fe70f689059476cec5b0ed950078b680c9 582c2ba6a83a58fde8e34d1247f4e987cbe1a622    refs/heads/REL2_0B
Author: Marc G. Fournier <scrappy@hub.org>
Date:   Tue Dec 10 03:29:41 1996 +0000
   Test two...branch REL2_0B works...I think

M    src/Makefile

commit 0861594cb3835bdf1cfbfe60884386c18df9ff64 9e60c1711d359f2cefe18c0b62f76a182aadfbd5    refs/tags/release-6-3
Author: Marc G. Fournier <scrappy@hub.org>
Date:   Tue Dec 10 03:03:36 1996 +0000
   No change...just a test to make sure I didn't screw anything up

M    src/Makefile

commit 9e60c1711d359f2cefe18c0b62f76a182aadfbd5 33edbdb59b741daed0b26b7033b1ce1b3e70b453    refs/tags/release-6-3
Author: Bryan Henderson <bryanh@giraffe.netgate.net>
Date:   Mon Dec 9 01:55:51 1996 +0000
   Monitor has been obsoleted by psql.

D    src/bin/monitor/Makefile
D    src/bin/monitor/monitor.c

commit 582c2ba6a83a58fde8e34d1247f4e987cbe1a622 33edbdb59b741daed0b26b7033b1ce1b3e70b453    refs/tags/REL2_0
Author: PostgreSQL Daemon <webmaster@postgresql.org>
Date:   Mon Dec 9 01:24:54 1996 +0000
   This commit was manufactured by cvs2svn to create branch 'REL2_0B'.      Sprout from master 1996-12-09 01:24:53 UTC
BryanHenderson <bryanh@giraffe.netgate.net> 'Remove include of libpq-fe.h.  This file has nothing to do with libpq.'
Delete:      src/bin/monitor/Makefile       src/bin/monitor/monitor.c
 

D    src/bin/monitor/Makefile
D    src/bin/monitor/monitor.c

commit 33edbdb59b741daed0b26b7033b1ce1b3e70b453 79729c0e5efab44c764a69ceaa9d52ecd6be1ce5    refs/tags/release-6-3
Author: Bryan Henderson <bryanh@giraffe.netgate.net>
Date:   Mon Dec 9 01:24:53 1996 +0000
   Remove include of libpq-fe.h.  This file has nothing to do with libpq.

M    src/test/regress/regress.c

Now as far as I can tell, the branch was made immediately before those
test commits you can see Marc making in each branch.  In particular,
it was definitely made *after* Bryan deleted the src/bin/monitor files,
because neither of them have REL2_0 or REL2_0B tags.  So why did cvs2git
choose to sprout the branch from the commit before that, and have to
duplicate the deletion of the files?  This sure looks like a bug to me.
It's a minor issue of course, and I don't have a problem with accepting
the history as shown above, but I'm curious why it's doing that.
        regards, tom lane