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Contributing to Consul

Note: We take Consul's security and our users' trust very seriously. If you believe you have found a security issue in Consul, please responsibly disclose by contacting us at security@hashicorp.com.

First: if you're unsure or afraid of anything, just ask or submit the issue or pull request anyways. You won't be yelled at for giving your best effort. The worst that can happen is that you'll be politely asked to change something. We appreciate any sort of contributions, and don't want a wall of rules to get in the way of that.

That said, if you want to ensure that a pull request is likely to be merged, talk to us! A great way to do this is in issues themselves. When you want to work on an issue, comment on it first and tell us the approach you want to take.

Getting Started

Some Ways to Contribute

  • Report potential bugs.
  • Suggest product enhancements.
  • Increase our test coverage.
  • Fix a bug.
  • Implement a requested enhancement.
  • Improve our guides and documentation. Consul's Guides, Docs, and api godoc are deployed from this repo.
  • Respond to questions about usage on the issue tracker or the Consul section of the [HashiCorp forum]: (https://discuss.hashicorp.com/c/consul)

Reporting an Issue

Note: Issues on GitHub for Consul are intended to be related to bugs or feature requests. Questions should be directed to other community resources such as the: Discuss Forum, FAQ, or Guides.

  • Make sure you test against the latest released version. It is possible we already fixed the bug you're experiencing. However, if you are on an older version of Consul and feel the issue is critical, do let us know.

  • Check existing issues (both open and closed) to make sure it has not been reported previously.

  • Provide a reproducible test case. If a contributor can't reproduce an issue, then it dramatically lowers the chances it'll get fixed.

  • Aim to respond promptly to any questions made by the Consul team on your issue. Stale issues will be closed.

Issue Lifecycle

  1. The issue is reported.

  2. The issue is verified and categorized by a Consul maintainer. Categorization is done via tags. For example, bugs are tagged as "bug".

  3. Unless it is critical, the issue is left for a period of time (sometimes many weeks), giving outside contributors a chance to address the issue.

  4. The issue is addressed in a pull request or commit. The issue will be referenced in the commit message so that the code that fixes it is clearly linked. Any change a Consul user might need to know about will include a changelog entry in the PR.

  5. The issue is closed.

Making Changes to Consul

Prerequisites

If you wish to work on Consul itself, you'll first need to:

Building Consul

To build Consul, run make dev. In a few moments, you'll have a working consul executable in consul/bin and $GOPATH/bin:

Note: make dev will build for your local machine's os/architecture. If you wish to build for all os/architecture combinations, use make.

Modifying the Code

Code Formatting

Go provides tooling to apply consistent code formatting. If you make any changes to the code, run gofmt -s -w to automatically format the code according to Go standards.

Updating Go Module Dependencies

If a dependency is added or change, run go mod tidy to update go.mod and go.sum.

Developer Documentation

Developer-focused documentation about the Consul code base is under ./docs, and godoc package document can be read at pkg.go.dev/github.com/hashicorp/consul.

Testing

During development, it may be more convenient to check your work-in-progress by running only the tests which you expect to be affected by your changes, as the full test suite can take several minutes to execute. Go's built-in test tool allows specifying a list of packages to test and the -run option to only include test names matching a regular expression. The go test -short flag can also be used to skip slower tests.

Examples (run from the repository root):

  • go test -v ./connect will run all tests in the connect package (see ./connect folder)
  • go test -v -run TestRetryJoin ./command/agent will run all tests in the agent package (see ./command/agent folder) with name substring TestRetryJoin

When a pull request is opened CI will run all tests and lint to verify the change.

Submitting a Pull Request

Before writing any code, we recommend:

  • Create a Github issue if none already exists for the code change you'd like to make.
  • Write a comment on the Github issue indicating you're interested in contributing so maintainers can provide their perspective if needed.

Keep your pull requests (PRs) small and open them early so you can get feedback on approach from maintainers before investing your time in larger changes. For example, see how applying URL-decoding of resource names across the whole HTTP API started with iterating on the right approach for a few endpoints before applying more broadly.

When you're ready to submit a pull request:

  1. Review the list of checklists for common changes and follow any that apply to your work.
  2. Include evidence that your changes work as intended (e.g., add/modify unit tests; describe manual tests you ran, in what environment, and the results including screenshots or terminal output).
  3. Open the PR from your fork against base repository hashicorp/consul and branch main.
  4. Include any specific questions that you have for the reviewer in the PR description or as a PR comment in Github.
    • If there's anything you find the need to explain or clarify in the PR, consider whether that explanation should be added in the source code as comments.
    • You can submit a draft PR if your changes aren't finalized but would benefit from in-process feedback.
  5. If there's any reason Consul users might need to know about this change, add a changelog entry.
  6. After you submit, the Consul maintainers team needs time to carefully review your contribution and ensure it is production-ready, considering factors such as: security, backwards-compatibility, potential regressions, etc.
  7. After you address Consul maintainer feedback and the PR is approved, a Consul maintainer will merge it. Your contribution will be available from the next major release (e.g., 1.x) unless explicitly backported to an existing or previous major release by the maintainer.

Checklists

Some common changes that many PRs require are documented through checklists as checklist-*.md files in docs/, including: