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Want to contribute? Great! First, read this page (including the small print at the end).
### Before you contribute
Before we can use your code, you must sign the
[Google Individual Contributor License Agreement](
(CLA), which you can do online. The CLA is necessary mainly because you own the
copyright to your changes, even after your contribution becomes part of our
codebase, so we need your permission to use and distribute your code. We also
need to be sure of various other thingsfor instance that you'll tell us if you
know that your code infringes on other people's patents. You don't have to sign
the CLA until after you've submitted your code for review and a member has
approved it, but you must do it before we can put your code into our codebase.
Before you start working on a larger contribution, you should get in touch with
us first via email with your idea so that we can help out and possibly guide
you. Coordinating up front makes it much easier to avoid frustration later on.
### Code reviews
All submissions, including submissions by project members, require review. We
use [Gerrit]( for this purpose.
#### Setup
If you have not done so on this machine, you will need to set up a password for
Gerrit. Sign in with a Google account, visit
[this link](, and click the "Generate
Password" link in the top right. You will also need to prepare your checkout to
[add Change-Ids](
on commit. Run:
curl -Lo .git/hooks/commit-msg
chmod u+x .git/hooks/commit-msg
#### Uploading changes
To upload a change, push it to the special `refs/for/master` target:
git push origin HEAD:refs/for/master
The output will then give you a link to the change. Add `` and
`` as reviewers.
Pushing a commit with the same Change-Id as an existing change will upload a new
version of it. (Use the `git rebase` or `git commit --amend` commands.)
For more detailed instructions, see the
[Gerrit User Guide](
### The small print
Contributions made by corporations are covered by a different agreement than
the one above, the
[Software Grant and Corporate Contributor License Agreement](