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Contributing to AMP

Want to contribute to AMP? We think you're awesome! This page should help you get started.


Code of Conduct

Before becoming involved, please read our CODE-OF-CONDUCT.

Reporting security issues

The project maintainers take security seriously. If you discover a security issue, please bring it to their attention right away!

Please DO NOT file a public issue. Instead, send your report privately to

Reporting other issues

Helping to provide detailed reports on issues is a great way to contribute to the project and it is highly appreciated.

Before reporting an issue, however, please check that it hasn't already been filed in our issue tracker. If you find one already open, please feel free to add any extra information you feel adds value in helping to resolve it. You can use the "subscribe" button to get update notifications. However, please do not leave "+1" type of comments that only clutter the discussion and don't help resolve the issue itself. GitHub now provides the ability to add reactions to issues and comments, if you want to show your enthusiasm (or lack thereof) for anything in particular.

When reporting an issue

Please include:

  • The output of docker version.
  • The output of docker info.
  • The output of amp --version.
  • The output of amp --config.
  • Steps to reproduce the problem (if possible and applicable).

If sending lengthy output such as logs, it is preferred that you create a gist and provide the link. Remove any sensitive data before posting anything (replace with "REDACTED").

Quick contribution tips and guidelines

Pull requests are always welcome

We welcome and appreciate contributors who want to help refactor code, fix bugs, and submit features. With respect to submitting any improvements, these should first be documented as an issue before work is started.


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 (make test) 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. For a good set of style and grammar conventions, see Docker's guide here.

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

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. Post a comment after pushing. New commits show up in the pull request automatically, but the reviewers are notified only when you comment.

Pull requests must be cleanly rebased on top of master without multiple branches mixed into the PR.

Before you make a pull request, squash your commits into logical units of work using git rebase -i and git push -f. A logical unit of work is a consistent set of patches that should be reviewed together: for example, upgrading the version of a vendored dependency and taking advantage of its now available new feature constitute two separate units of work. Implementing a new function and calling it in another file constitute a single logical unit of work. The very high majority of submissions should have a single commit, so if in doubt: squash down to one.

Include documentation changes in the same pull request so that a revert would remove all traces of the feature or fix.

Include an issue reference like Closes #XXXX or Fixes #XXXX in commits that close an issue. Including references automatically closes the issue on a merge.

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

Please see the Coding Style section for further guidelines.

Merge approval

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 the MAINTAINERS page.

Sign your work

The sign-off is a simple line at the end of the explanation for the patch. Your signature certifies that you wrote the patch 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

The nice thing about this method is that contributors do not need to execute an individual Contributor License Agreement (CLA) to participate. This is a great idea that originated with the Linux Kernel Project is and is used by the Docker project itself.

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

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

(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:

Signed-off-by: Joe Smith <>

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

If you set your and git configs, you can sign your commit automatically with git commit -s.

Becoming a maintainer

The procedures for adding new maintainers are explained in the MAINTAINERS document.

Keep in mind that 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 be a valued and appreciated contributor!

Coding Style

Unless explicitly stated, we follow all coding guidelines from the Go community. While some of these standards may seem arbitrary, they somehow seem to result in a solid, consistent codebase.

It is possible that the code base does not currently comply with these guidelines. We are not looking for a massive PR that fixes this, since that goes against the spirit of the guidelines. All new contributions should make a best effort to clean up and make the code base better than they left it. Obviously, apply your best judgement. Remember, the goal here is to make the code base easier for humans to navigate and understand. Always keep that in mind when nudging others to comply.

The rules:

  1. All code should be formatted with gofmt -s.
  2. All code should pass the default levels of golint.
  3. All code should follow the guidelines covered in Effective Go and Go Code Review Comments.
  4. Comment the code. Tell us the why, the history and the context.
  5. Document all declarations and methods, even private ones. Declare expectations, caveats and anything else that may be important. If a type gets exported, having the comments already there will ensure it's ready.
  6. Variable name length should be proportional to its context and no longer. noCommaALongVariableNameLikeThisIsNotMoreClearWhenASimpleCommentWouldDo. In practice, short methods will have short variable names and globals will have longer names.
  7. No underscores in package names. If you need a compound name, step back, and re-examine why you need a compound name. If you still think you need a compound name, lose the underscore.
  8. No utils or helpers packages. If a function is not general enough to warrant its own package, it has not been written generally enough to be a part of a util package. Just leave it unexported and well-documented.
  9. All tests should run with go test and outside tooling should not be required. No, we don't need another unit testing framework. Assertion packages are acceptable if they provide real incremental value.
  10. Even though we call these "rules" above, they are actually just guidelines. Since you've read all the rules, you now know that.

If you are having trouble getting into the mood of idiomatic Go, we recommend reading through Effective Go. The Go Blog is also a great resource. Drinking the kool-aid is a lot easier than going thirsty.