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CONTRIBUTING.MD

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Commit Message Guidelines

We have precise rules over how our git commit messages should be formatted. This leads to more readable messages that are easy to follow when looking through the project history.

Commit Message Format

Each commit message consists of a header, a body and a footer. The header has a special format that includes a type, a scope and a subject:

<type>(<scope>): <subject>
<BLANK LINE>
<body>
<BLANK LINE>
<footer>

The header with type is mandatory. The scope of the header is optional as far as the automated PR checks are concerned, but be advised that PR reviewers may request you provide an applicable scope.

Any line of the commit message should no be longer 72 characters! This allows the message to be easier to read on GitHub as well as in various git tools.

The footer should contain a reference to an Azure Boards ticket (e.g. AB#[number]).

Example 1:

feat(telemetry): Add new MQTT events

Events are now emitted over various /mps topics on MQTT for success/failures 
as they occur throughout the service.

Resolves: AB#2222

Revert

If the commit reverts a previous commit, it should begin with revert: , followed by the header of the reverted commit. In the body it should say: This reverts commit <hash>., where the hash is the SHA of the commit being reverted.

Type

Must be one of the following:

  • feat: A new feature
  • fix: A bug fix
  • docs: Documentation only changes
  • style: Changes that do not affect the meaning of the code (white-space, formatting, etc)
  • refactor: A code change that neither fixes a bug nor adds a feature
  • perf: A code change that improves performance
  • test: Adding missing tests or correcting existing tests
  • build: Changes that affect the CI/CD pipeline or build system or external dependencies (example scopes: travis, jenkins, makefile)
  • ci: Changes provided by DevOps for CI purposes.
  • revert: Reverts a previous commit.

Scope

Should be one of the following: Modules:

  • common: A change or addition to the common module
  • tracker: A change or addition to the tracker module
  • server: A change or addition to the server module
  • msgs: A change or addition to msgs module
  • eval: Any change to benchmark tools
  • deps: A change to any dependency or 3rd-party library
  • all: A change that affects all modules
  • no scope: If no scope is provided, it is assumed the PR does not apply to the above scopes

Body

Just as in the subject, use the imperative, present tense: "change" not "changed" nor "changes". Here is detailed guideline on how to write the body of the commit message (Reference):

More detailed explanatory text, if necessary. Wrap it to about 72
characters or so. In some contexts, the first line is treated as the
subject of the commit and the rest of the text as the body. The
blank line separating the summary from the body is critical (unless
you omit the body entirely); various tools like `log`, `shortlog`
and `rebase` can get confused if you run the two together.

Explain the problem that this commit is solving. Focus on why you
are making this change as opposed to how (the code explains that).
Are there side effects or other unintuitive consequences of this
change? Here's the place to explain them.

Further paragraphs come after blank lines.

 - Bullet points are okay, too

 - Typically a hyphen or asterisk is used for the bullet, preceded
   by a single space, with blank lines in between, but conventions
   vary here

Footer

The footer should contain a reference to JIRA ticket (e.g. SL6-0000) that this commit Closes or Resolves. The footer should contain any information about Breaking Changes.

Breaking Changes should start with the word BREAKING CHANGE: with a space or two newlines.

Pull Requests practices

  • PR author is responsible to merge its own PR after review has been done and CI has passed.
  • When merging, make sure git linear history is preserved. PR author should select a merge option (Rebase and merge or Squash and merge) based on which option will fit the best to the git linear history.
  • PR topic should follow the same guidelines as the header of the Git Commit Message