bazaar auth and alternative forges

[Adrien Saladin]

Hi,

I would like to setup a private forge for internal projects. Since
setting up a launchpad server seems discouraged
(https://answers.launchpad.net/launchpad/+faq/920) I looked at other
open source forges, namely trac and redmine.

Documentation about installing those forges with bzr is minimal, and
for what I understand they only take care of web UI, leaving the
problem of managing  bzr branches to the sysadmin.
Now I wonder if there is a way to have several users allowed to work
with such setup. Do they all push to the same branch, can they all
have their private branches and either redmine or trac can be aware of
them ?

If two people can push to the same branch, how does the authentication
+ authorization part work ? Can we authenticate through an http server
for pushing bazaar branches. Are there smart vs dumb protocol issues ?

Thanks for your answers. I hope it was not too much for a single e-mail.
Adrien