Automatic tagging

[Jesse Glick]

Matt Mackall wrote:
> If the goal is just to publish a known-good build, why not simply
> have your build engine have a separate "builds" repo it pushes to
> whenever it succeeds?

FWIW we do just this with NetBeans. hg.netbeans.org/main is the primary 
development repository; when the official continuous builder finishes a 
build without error, the tip changeset of that build is pushed to 
hg.netbeans.org/main-golden. Therefore you can always safely pull from 
the golden repo.