Add Contribution guidelines
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# Contributing to Docker
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Want to hack on Docker? Awesome! We have a contributor's guide that explains
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[setting up a Docker development environment and the contribution
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process](https://docs.docker.com/opensource/project/who-written-for/).
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This page contains information about reporting issues as well as some tips and
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guidelines useful to experienced open source contributors. Finally, make sure
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you read our [community guidelines](#docker-community-guidelines) before you
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start participating.
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## Topics
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* [Reporting Security Issues](#reporting-security-issues)
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* [Design and Cleanup Proposals](#design-and-cleanup-proposals)
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* [Reporting Issues](#reporting-other-issues)
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* [Quick Contribution Tips and Guidelines](#quick-contribution-tips-and-guidelines)
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* [Community Guidelines](#docker-community-guidelines)
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## Reporting security issues
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The Docker maintainers take security seriously. If you discover a security
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issue, please bring it to their attention right away!
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Please **DO NOT** file a public issue, instead send your report privately to
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[security@docker.com](mailto:security@docker.com).
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Security reports are greatly appreciated and we will publicly thank you for it.
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We also like to send gifts—if you're into Docker schwag, make sure to let
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us know. We currently do not offer a paid security bounty program, but are not
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ruling it out in the future.
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## Reporting other issues
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A great way to contribute to the project is to send a detailed report when you
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encounter an issue. We always appreciate a well-written, thorough bug report,
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and will thank you for it!
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Check that [our issue database](https://github.com/docker/cli/issues)
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doesn't already include that problem or suggestion before submitting an issue.
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If you find a match, you can use the "subscribe" button to get notified on
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updates. Do *not* leave random "+1" or "I have this too" comments, as they
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only clutter the discussion, and don't help resolving it. However, if you
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have ways to reproduce the issue or have additional information that may help
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resolving the issue, please leave a comment.
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When reporting issues, always include:
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* The output of `docker version`.
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* The output of `docker info`.
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Also include the steps required to reproduce the problem if possible and
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applicable. This information will help us review and fix your issue faster.
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When sending lengthy log-files, consider posting them as a gist (https://gist.github.com).
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Don't forget to remove sensitive data from your logfiles before posting (you can
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replace those parts with "REDACTED").
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## Quick contribution tips and guidelines
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This section gives the experienced contributor some tips and guidelines.
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### Pull requests are always welcome
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Not sure if that typo is worth a pull request? Found a bug and know how to fix
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it? Do it! We will appreciate it. Any significant improvement should be
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documented as [a GitHub issue](https://github.com/docker/cli/issues) before
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anybody starts working on it.
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We are always thrilled to receive pull requests. We do our best to process them
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quickly. If your pull request is not accepted on the first try,
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don't get discouraged! Our contributor's guide explains [the review process we
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use for simple changes](https://docs.docker.com/opensource/workflow/make-a-contribution/).
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### Talking to other Docker users and contributors
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<table class="tg">
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<col width="45%">
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<col width="65%">
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<tr>
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<td>Forums</td>
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<td>
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A public forum for users to discuss questions and explore current design patterns and
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best practices about Docker and related projects in the Docker Ecosystem. To participate,
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just log in with your Docker Hub account on <a href="https://forums.docker.com" target="_blank">https://forums.docker.com</a>.
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</td>
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</tr>
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<tr>
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<td>Community Slack</td>
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<td>
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The Docker Community has a dedicated Slack chat to discuss features and issues. You can sign-up <a href="https://community.docker.com/registrations/groups/4316" target="_blank">with this link</a>.
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</td>
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</tr>
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<tr>
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<td>Twitter</td>
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<td>
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You can follow <a href="https://twitter.com/docker/" target="_blank">Docker's Twitter feed</a>
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to get updates on our products. You can also tweet us questions or just
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share blogs or stories.
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</td>
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</tr>
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<tr>
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<td>Stack Overflow</td>
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<td>
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Stack Overflow has over 17000 Docker questions listed. We regularly
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monitor <a href="https://stackoverflow.com/search?tab=newest&q=docker" target="_blank">Docker questions</a>
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and so do many other knowledgeable Docker users.
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</td>
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</tr>
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</table>
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### Conventions
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Fork the repository and make changes on your fork in a feature branch:
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- If it's a bug fix branch, name it XXXX-something where XXXX is the number of
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the issue.
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- If it's a feature branch, create an enhancement issue to announce
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your intentions, and name it XXXX-something where XXXX is the number of the
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issue.
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Submit unit tests for your changes. Go has a great test framework built in; use
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it! Take a look at existing tests for inspiration. [Run the full test
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suite](README.md) on your branch before
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submitting a pull request.
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Update the documentation when creating or modifying features. Test your
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documentation changes for clarity, concision, and correctness, as well as a
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clean documentation build. See our contributors guide for [our style
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guide](https://docs.docker.com/opensource/doc-style) and instructions on [building
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the documentation](https://docs.docker.com/opensource/project/test-and-docs/#build-and-test-the-documentation).
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Write clean code. Universally formatted code promotes ease of writing, reading,
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and maintenance. Always run `gofmt -s -w file.go` on each changed file before
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committing your changes. Most editors have plug-ins that do this automatically.
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Pull request descriptions should be as clear as possible and include a reference
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to all the issues that they address.
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Commit messages must start with a capitalized and short summary (max. 50 chars)
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written in the imperative, followed by an optional, more detailed explanatory
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text which is separated from the summary by an empty line.
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Code review comments may be added to your pull request. Discuss, then make the
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suggested modifications and push additional commits to your feature branch. Post
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a comment after pushing. New commits show up in the pull request automatically,
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but the reviewers are notified only when you comment.
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Pull requests must be cleanly rebased on top of master without multiple branches
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mixed into the PR.
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**Git tip**: If your PR no longer merges cleanly, use `rebase master` in your
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feature branch to update your pull request rather than `merge master`.
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Before you make a pull request, squash your commits into logical units of work
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using `git rebase -i` and `git push -f`. A logical unit of work is a consistent
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set of patches that should be reviewed together: for example, upgrading the
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version of a vendored dependency and taking advantage of its now available new
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feature constitute two separate units of work. Implementing a new function and
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calling it in another file constitute a single logical unit of work. The very
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high majority of submissions should have a single commit, so if in doubt: squash
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down to one.
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After every commit, make sure the test suite passes. Include documentation
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changes in the same pull request so that a revert would remove all traces of
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the feature or fix.
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Include an issue reference like `Closes #XXXX` or `Fixes #XXXX` in the pull request
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description that close an issue. Including references automatically closes the issue
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on a merge.
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Please do not add yourself to the `AUTHORS` file, as it is regenerated regularly
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from the Git history.
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Please see the [Coding Style](#coding-style) for further guidelines.
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### Merge approval
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Docker maintainers use LGTM (Looks Good To Me) in comments on the code review to
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indicate acceptance.
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A change requires LGTMs from an absolute majority of the maintainers of each
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component affected. For example, if a change affects `docs/` and `registry/`, it
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needs an absolute majority from the maintainers of `docs/` AND, separately, an
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absolute majority of the maintainers of `registry/`.
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For more details, see the [MAINTAINERS](MAINTAINERS) page.
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### Sign your work
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The sign-off is a simple line at the end of the explanation for the patch. Your
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signature certifies that you wrote the patch or otherwise have the right to pass
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it on as an open-source patch. The rules are pretty simple: if you can certify
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the below (from [developercertificate.org](http://developercertificate.org/)):
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```
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Developer Certificate of Origin
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Version 1.1
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Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
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660 York Street, Suite 102,
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San Francisco, CA 94110 USA
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Everyone is permitted to copy and distribute verbatim copies of this
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license document, but changing it is not allowed.
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Developer's Certificate of Origin 1.1
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By making a contribution to this project, I certify that:
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(a) The contribution was created in whole or in part by me and I
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have the right to submit it under the open source license
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indicated in the file; or
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(b) The contribution is based upon previous work that, to the best
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of my knowledge, is covered under an appropriate open source
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license and I have the right under that license to submit that
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work with modifications, whether created in whole or in part
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by me, under the same open source license (unless I am
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permitted to submit under a different license), as indicated
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in the file; or
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(c) The contribution was provided directly to me by some other
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person who certified (a), (b) or (c) and I have not modified
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it.
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(d) I understand and agree that this project and the contribution
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are public and that a record of the contribution (including all
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personal information I submit with it, including my sign-off) is
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maintained indefinitely and may be redistributed consistent with
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this project or the open source license(s) involved.
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```
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Then you just add a line to every git commit message:
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Signed-off-by: Joe Smith <joe.smith@email.com>
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Use your real name (sorry, no pseudonyms or anonymous contributions.)
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If you set your `user.name` and `user.email` git configs, you can sign your
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commit automatically with `git commit -s`.
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### How can I become a maintainer?
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The procedures for adding new maintainers are explained in the
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global [MAINTAINERS](https://github.com/docker/opensource/blob/master/MAINTAINERS)
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file in the [https://github.com/docker/opensource/](https://github.com/docker/opensource/)
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repository.
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Don't forget: being a maintainer is a time investment. Make sure you
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will have time to make yourself available. You don't have to be a
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maintainer to make a difference on the project!
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## Docker community guidelines
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We want to keep the Docker community awesome, growing and collaborative. We need
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your help to keep it that way. To help with this we've come up with some general
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guidelines for the community as a whole:
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* Be nice: Be courteous, respectful and polite to fellow community members:
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no regional, racial, gender, or other abuse will be tolerated. We like
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nice people way better than mean ones!
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* Encourage diversity and participation: Make everyone in our community feel
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welcome, regardless of their background and the extent of their
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contributions, and do everything possible to encourage participation in
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our community.
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* Keep it legal: Basically, don't get us in trouble. Share only content that
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you own, do not share private or sensitive information, and don't break
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the law.
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* Stay on topic: Make sure that you are posting to the correct channel and
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avoid off-topic discussions. Remember when you update an issue or respond
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to an email you are potentially sending to a large number of people. Please
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consider this before you update. Also remember that nobody likes spam.
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* Don't send email to the maintainers: There's no need to send email to the
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maintainers to ask them to investigate an issue or to take a look at a
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pull request. Instead of sending an email, GitHub mentions should be
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used to ping maintainers to review a pull request, a proposal or an
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issue.
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### Guideline violations — 3 strikes method
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The point of this section is not to find opportunities to punish people, but we
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do need a fair way to deal with people who are making our community suck.
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1. First occurrence: We'll give you a friendly, but public reminder that the
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behavior is inappropriate according to our guidelines.
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2. Second occurrence: We will send you a private message with a warning that
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any additional violations will result in removal from the community.
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3. Third occurrence: Depending on the violation, we may need to delete or ban
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your account.
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**Notes:**
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* Obvious spammers are banned on first occurrence. If we don't do this, we'll
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have spam all over the place.
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* Violations are forgiven after 6 months of good behavior, and we won't hold a
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grudge.
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* People who commit minor infractions will get some education, rather than
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hammering them in the 3 strikes process.
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* The rules apply equally to everyone in the community, no matter how much
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you've contributed.
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* Extreme violations of a threatening, abusive, destructive or illegal nature
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will be addressed immediately and are not subject to 3 strikes or forgiveness.
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* Contact abuse@docker.com to report abuse or appeal violations. In the case of
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appeals, we know that mistakes happen, and we'll work with you to come up with a
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fair solution if there has been a misunderstanding.
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## Coding Style
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Unless explicitly stated, we follow all coding guidelines from the Go
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community. While some of these standards may seem arbitrary, they somehow seem
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to result in a solid, consistent codebase.
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It is possible that the code base does not currently comply with these
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guidelines. We are not looking for a massive PR that fixes this, since that
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goes against the spirit of the guidelines. All new contributions should make a
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best effort to clean up and make the code base better than they left it.
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Obviously, apply your best judgement. Remember, the goal here is to make the
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code base easier for humans to navigate and understand. Always keep that in
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mind when nudging others to comply.
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The rules:
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1. All code should be formatted with `gofmt -s`.
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2. All code should pass the default levels of
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[`golint`](https://github.com/golang/lint).
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3. All code should follow the guidelines covered in [Effective
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Go](http://golang.org/doc/effective_go.html) and [Go Code Review
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Comments](https://github.com/golang/go/wiki/CodeReviewComments).
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4. Comment the code. Tell us the why, the history and the context.
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5. Document _all_ declarations and methods, even private ones. Declare
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expectations, caveats and anything else that may be important. If a type
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gets exported, having the comments already there will ensure it's ready.
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6. Variable name length should be proportional to its context and no longer.
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`noCommaALongVariableNameLikeThisIsNotMoreClearWhenASimpleCommentWouldDo`.
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In practice, short methods will have short variable names and globals will
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have longer names.
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7. No underscores in package names. If you need a compound name, step back,
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and re-examine why you need a compound name. If you still think you need a
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compound name, lose the underscore.
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8. No utils or helpers packages. If a function is not general enough to
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warrant its own package, it has not been written generally enough to be a
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part of a util package. Just leave it unexported and well-documented.
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9. All tests should run with `go test` and outside tooling should not be
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required. No, we don't need another unit testing framework. Assertion
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packages are acceptable if they provide _real_ incremental value.
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10. Even though we call these "rules" above, they are actually just
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guidelines. Since you've read all the rules, you now know that.
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If you are having trouble getting into the mood of idiomatic Go, we recommend
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reading through [Effective Go](https://golang.org/doc/effective_go.html). The
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[Go Blog](https://blog.golang.org) is also a great resource. Drinking the
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kool-aid is a lot easier than going thirsty.
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