Add contributing, code of conduct
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# Code of conduct
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- [Moby community guidelines](https://github.com/moby/moby/blob/master/CONTRIBUTING.md#moby-community-guidelines)
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- [Docker Code of Conduct](https://github.com/docker/code-of-conduct)
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# Contribute to the Buildx project
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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.
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## Reporting security issues
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The project 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 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/buildx/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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Include the steps required to reproduce the problem if possible and applicable.
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This information will help us review and fix your issue faster. When sending
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lengthy log-files, consider posting them as an attachment, instead of posting
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inline.
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**Do not forget to remove sensitive data from your logfiles before submitting**
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 (you can replace those parts with "REDACTED").
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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.
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If your pull request is not accepted on the first try, don't be discouraged! If
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there's a problem with the implementation, hopefully you received feedback on
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what to improve.
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We're trying very hard to keep Buildx lean and focused. We don't want it to
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do everything for everybody. This means that we might decide against
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incorporating a new feature. However, there might be a way to implement that
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feature *on top of* Buildx.
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### Design and cleanup proposals
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You can propose new designs for existing features. You can also design
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entirely new features. We really appreciate contributors who want to refactor or
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otherwise cleanup our project.
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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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1 Letterman Drive
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Suite D4700
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San Francisco, CA, 94129
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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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### Run the unit- and integration-tests
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To enter a demo container environment and experiment, you may run:
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```
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$ make shell
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```
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To validate PRs before submitting them you should run:
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```
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$ make validate-all
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```
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To generate new vendored files with go modules run:
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```
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$ make vendor
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```
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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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- Submit tests for your changes. See [run the unit- and integration-tests](#run-the-unit--and-integration-tests)
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  for details.
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- [Sign your work](#sign-your-work)
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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
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reference to all the issues that they address. Be sure that the [commit
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messages](#commit-messages) also contain the relevant information.
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### Successful Changes
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Before contributing large or high impact changes, make the effort to coordinate
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with the maintainers of the project before submitting a pull request. This
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prevents you from doing extra work that may or may not be merged.
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Large PRs that are just submitted without any prior communication are unlikely
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to be successful.
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While pull requests are the methodology for submitting changes to code, changes
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are much more likely to be accepted if they are accompanied by additional
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engineering work. While we don't define this explicitly, most of these goals
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are accomplished through communication of the design goals and subsequent
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solutions. Often times, it helps to first state the problem before presenting
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solutions.
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Typically, the best methods of accomplishing this are to submit an issue,
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stating the problem. This issue can include a problem statement and a
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checklist with requirements. If solutions are proposed, alternatives should be
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listed and eliminated. Even if the criteria for elimination of a solution is
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frivolous, say so.
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Larger changes typically work best with design documents. These are focused on
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providing context to the design at the time the feature was conceived and can
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inform future documentation contributions.
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### Commit Messages
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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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Commit messages should follow best practices, including explaining the context
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of the problem and how it was solved, including in caveats or follow up changes
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required. They should tell the story of the change and provide readers
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understanding of what led to it.
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If you're lost about what this even means, please see [How to Write a Git
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Commit Message](http://chris.beams.io/posts/git-commit/) for a start.
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In practice, the best approach to maintaining a nice commit message is to
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leverage a `git add -p` and `git commit --amend` to formulate a solid
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changeset. This allows one to piece together a change, as information becomes
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available.
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If you squash a series of commits, don't just submit that. Re-write the commit
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message, as if the series of commits was a single stroke of brilliance.
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That said, there is no requirement to have a single commit for a PR, as long as
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each commit tells the story. For example, if there is a feature that requires a
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package, it might make sense to have the package in a separate commit then have
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a subsequent commit that uses it.
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Remember, you're telling part of the story with the commit message. Don't make
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your chapter weird.
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### Review
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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](#run-the-unit--and-integration-tests).
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  Include documentation changes in the same pull request so that a revert would
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  remove all traces of the feature or fix.
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- Include an issue reference like `closes #XXXX` or `fixes #XXXX` in the PR
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  description that close an issue. Including references automatically closes
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  the issue on a merge.
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- 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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- See the [Coding Style](#coding-style) for further guidelines.
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### Merge approval
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Project maintainers use LGTM (Looks Good To Me) in comments on the code review to
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indicate acceptance, or use the Github review approval feature.
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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.
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