Prerequisites:

• Git version 1.8.2 or later
  For the submodule --remote option, which makes git pull the latest HEAD of the right branch for the submodules, instead of a fixed commit.

• Further prerequisites as mentioned in qtcreator/README.md

Initializing

Initialize all submodules and checks out current HEAD of remote branch:

git checkout <qtcreatorbranch>
git submodule update --init --remote

Updating:

Pulls and rebases all initialized submodules to current HEAD of remote branch:

git pull --rebase
git submodule update --remote --rebase

Working:

Set up a submodule for working with gerrit by adding the gerrit remote, and installing the commit message hook, similar to how it is described in Setting up Gerrit (If you did not use the init-repository scripts). You might also want to work on a branch in the submodule. Then work in the submodule as usual and push to gerrit via the gerrit remote.

cd <submodule>
# add submodule
git remote add gerrit ssh://codereview.qt-project.org/qt-creator/<submodule_repository>
# install hook
gitdir=$(git rev-parse --git-dir); scp -p codereview.qt-project.org:hooks/commit-msg ${gitdir}/hooks/
# optional: check out branch
git checkout <branch>
# do some work, then push to gerrit
git push gerrit HEAD:refs/for/<branch>