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Contributing to Docker

Want to hack on Docker? Awesome! Here are instructions to get you started. They are probably not perfect, please let us know if anything feels wrong or incomplete.

Reporting Issues

When reporting issues on GitHub please include your host OS (Ubuntu 12.04, Fedora 19, etc). Please include:

  • The output of uname -a.
  • The output of docker version.
  • The output of docker -D info.

Please also include the steps required to reproduce the problem if possible and applicable. This information will help us review and fix your issue faster.

Build Environment

For instructions on setting up your development environment, please see our dedicated dev environment setup docs.

Contribution guidelines

Pull requests are always welcome

We are always thrilled to receive pull requests, and do our best to process them as fast as possible. Not sure if that typo is worth a pull request? Do it! We will appreciate it.

If your pull request is not accepted on the first try, don't be discouraged! If there's a problem with the implementation, hopefully you received feedback on what to improve.

We're trying very hard to keep Docker lean and focused. We don't want it to do everything for everybody. This means that we might decide against incorporating a new feature. However, there might be a way to implement that feature on top of Docker.

Discuss your design on the mailing list

We recommend discussing your plans on the mailing list before starting to code - especially for more ambitious contributions. This gives other contributors a chance to point you in the right direction, give feedback on your design, and maybe point out if someone else is working on the same thing.

Create issues...

Any significant improvement should be documented as a GitHub issue before anybody starts working on it.

...but check for existing issues first!

Please take a moment to check that an issue doesn't already exist documenting your bug report or improvement proposal. If it does, it never hurts to add a quick "+1" or "I have this problem too". This will help prioritize the most common problems and requests.

Conventions

Fork the repository and make changes on your fork in a feature branch:

  • If it's a bug fix branch, name it XXXX-something where XXXX is the number of the issue.
  • If it's a feature branch, create an enhancement issue to announce your intentions, and name it XXXX-something where XXXX is the number of the issue.

Submit unit tests for your changes. Go has a great test framework built in; use it! Take a look at existing tests for inspiration. Run the full test suite on your branch before submitting a pull request.

Update the documentation when creating or modifying features. Test your documentation changes for clarity, concision, and correctness, as well as a clean documentation build. See docs/README.md for more information on building the docs and how they get released.

Write clean code. Universally formatted code promotes ease of writing, reading, and maintenance. Always run gofmt -s -w file.go on each changed file before committing your changes. Most editors have plug-ins that do this automatically.

Pull requests descriptions should be as clear as possible and include a reference to all the issues that they address.

Pull requests must not contain commits from other users or branches.

Commit messages must start with a capitalized and short summary (max. 50 chars) written in the imperative, followed by an optional, more detailed explanatory text which is separated from the summary by an empty line.

Code review comments may be added to your pull request. Discuss, then make the suggested modifications and push additional commits to your feature branch. Be sure to post a comment after pushing. The new commits will show up in the pull request automatically, but the reviewers will not be notified unless you comment.

Before the pull request is merged, make sure that you squash your commits into logical units of work using git rebase -i and git push -f. After every commit the test suite should be passing. Include documentation changes in the same commit so that a revert would remove all traces of the feature or fix.

Commits that fix or close an issue should include a reference like Closes #XXXX or Fixes #XXXX, which will automatically close the issue when merged.

Please do not add yourself to the AUTHORS file, as it is regenerated regularly from the Git history.

Merge approval

Docker maintainers use LGTM (Looks Good To Me) in comments on the code review to indicate acceptance.

A change requires LGTMs from an absolute majority of the maintainers of each component affected. For example, if a change affects docs/ and registry/, it needs an absolute majority from the maintainers of docs/ AND, separately, an absolute majority of the maintainers of registry/.

For more details see MAINTAINERS.md

Sign your work

The sign-off is a simple line at the end of the explanation for the patch, which certifies that you wrote it or otherwise have the right to pass it on as an open-source patch. The rules are pretty simple: if you can certify the below (from developercertificate.org):

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
660 York Street, Suite 102,
San Francisco, CA 94110 USA

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

Then you just add a line to every git commit message:

Docker-DCO-1.1-Signed-off-by: Joe Smith <[email protected]> (github: github_handle)

Using your real name (sorry, no pseudonyms or anonymous contributions.)

One way to automate this, is customize your git commit.template by adding a prepare-commit-msg hook to your Docker repository:

curl -sSL -o .git/hooks/prepare-commit-msg https://raw.githubusercontent.com/dotcloud/docker/master/contrib/prepare-commit-msg.hook && chmod +x .git/hooks/prepare-commit-msg
  • Note: the above script expects to find your GitHub user name in git config --get github.user

Small patch exception

There are several exceptions to the signing requirement. Currently these are:

  • Your patch fixes spelling or grammar errors.
  • Your patch is a single line change to documentation contained in the docs directory.
  • Your patch fixes Markdown formatting or syntax errors in the documentation contained in the docs directory.

If you have any questions, please refer to the FAQ in the docs

How can I become a maintainer?

  • Step 1: Learn the component inside out
  • Step 2: Make yourself useful by contributing code, bug fixes, support etc.
  • Step 3: Volunteer on the IRC channel (#docker at Freenode)
  • Step 4: Propose yourself at a scheduled docker meeting in #docker-dev

Don't forget: being a maintainer is a time investment. Make sure you will have time to make yourself available. You don't have to be a maintainer to make a difference on the project!