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Excerpts from Sławek Kapłoński's message of 2014-06-15 13:10:56 -0700:
> Hello,
> 
> I want to start contributing to neutron project. I found bug which I
> want to try fix: https://bugs.launchpad.net/neutron/+bug/1204956 and I
> have question about "workflow" in such case. Should I clone neutron
> reposiotory from branch master and do changes based on master branch or
> maybe should I do my changes starting from any other branch? What
> should I do next when I will for example do patch for such bug?
> Thanks in advance for any help and explanation about that
> 

This should explain everything you need to know:

https://wiki.openstack.org/wiki/Gerrit_Workflow