Cloning this repository:

git clone git://gitorious.org/ruby-protobuf/mainline.git mainline
cd mainline

Add this repository as a remote to an existing local repository:

git remote add mainline git://gitorious.org/ruby-protobuf/mainline.git
git fetch mainline
git checkout -b my-local-tracking-branch mainline/master_or_other_branch

Cloning this repository:

git clone git://gitorious.org/~bryanl/ruby-protobuf/bryanls-clone.git bryanls-clone
cd bryanls-clone

Add this repository as a remote to an existing local repository:

git remote add bryanls-clone git://gitorious.org/~bryanl/ruby-protobuf/bryanls-clone.git
git fetch bryanls-clone
git checkout -b my-local-tracking-branch bryanls-clone/master_or_other_branch