rebuilding from old cvs tags

[Mike Bonnet]

On Thu, 2008-02-28 at 11:12 -0500, Bill Nottingham wrote:
> Mike Bonnet (mikeb at redhat.com) said: 
> > I think immutable tags are the answer here.  We already kind of assume
> > tags don't change once they're built, we might as well enforce it.  I
> > know force-tag is convenient, but how much harder is it really to bump
> > the revision number instead?
> 
> In the case of transient build errors, it's rather annoying.

If a transient build error (build system hiccup) prevented the build
from completing, you should be able to rebuild from the same tag.

Yes, I know there are some failure modes where this does not work, but
we're working on addressing those, and they should be the minority of
cases.