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Showing content from https://www.mediawiki.org/wiki/Gerrit/Commit_message_guidelines below:

Gerrit/Commit message guidelines - MediaWiki

For repositories that have a .gitmessage file in the repo (e.g. mediawiki/core), you can encourage yourself to good commit hygiene, by running the following command in your checked out repo

 git config commit.template .gitmessage

If you like it, you are encouraged to add it to more repos


The commit message of your change plays an important role. It is first thing other people will see about your change.

component: Short subject line

More details. The blank line between the subject and body is
mandatory. The subject line is used to represent the commit in
code-review requests, search results, git rebase, logs, and more.

Bug: T54321

The first line of the commit message is known as the subject. The subject should be less than 80 characters long (aim for 50-70).

Good examples are: Bad examples would be:

When writing the body text, think about the following questions:

Recommended:

Not recommended:

Footer and meta-data[edit]

The most important information of the footer is the Change-Id (mandatory) and Bug.

Format "Bug" and "Change-Id" meta-data exactly like in the examples below, and place them together at the end of the body, after one empty line.

Find more information on individual meta-data fields below.

jquery.badge: Add ability to display the number zero

Cupcake ipsum dolor sit. Amet tart cheesecake tiramisu chocolate cake
topping. Icing ice cream sweet roll. Biscuit dragée toffee wypas. 

Does not yet address T44834 or T176. Follow-up to Id5e7cbb1.

Bug: T42
Change-Id: I88c5f819c42d9fe1468be6b2cf74413d7d6d6907
Improved the code by fixing a bug.

Changed the files a.php and b.php

Bug: T42
Change-Id: I88c5f819c42d9fe1468be6b2cf74413d7d6d6907

If the repository you are contributing to has a

.gitmessage

file (

example

), use the following command to get a template to guide you in writing a commit message:

git config commit.template .gitmessage

Most programs we use that display Git commit, render the subject line as plain text. This means URLs do not work, and selecting/copying of text often is not possible. Therefore, do not mention Phabricator tasks, Git commits, or urls inside the subject line. Instead, mention those in the body text, or footer meta-data. That way, they can be universally selected, copied, or clicked.

You may start the subject line with a component, which will indicate what area of the project is changed by your commit.

It should be one of the following:

To reference a Phabricator bug or task, in the commit message mention it inline using the Txxx notation (e.g. "That was caused by T169.")

To express that a commit resolves (even partially) or is specially relevant to a bug, add Bug: Txxx in the footer at the end of the commit message.[2] (If you're amending a commit message, insert it immediately above the Change-Id: line, without an empty line between them. Remember to follow the overall structure rules and separate the body from the subject with one empty line.)

Bug: T169

A bot will automatically leave a comment on the Phabricator task about any significant events (being merged, abandoned, etc.). If a patch resolves two or more bugs, put each Bug: T12345 reference on its own line at the bottom.

Bug: T299087
Bug: T299088

Whenever you refer to another commit, use the SHA-1 git hash of the merged commit. If the commit in still pending review, use the Gerrit Change-Id hash instead of the git hash because the hash relates to an individual patch set (which changes when rebased, thus creating a dead-end).

Gerrit 's git-review tool will automatically append the "Change-Id: Ixxx" keyword to new commits.

Depends-On: Ixxx

If you have cross-repo dependencies (your commit depends on another commit in a different repository), declare them by adding Depends-On: Ixxx... to the last paragraph. ("Ixxx"... is the Change-Id of the other commit.) This will instruct Zuul to test the commit together with that one.

To provide additional guidance to developers, you can indicate the inverse relationship using Needed-By: Iyyy... in last paragraph of the commit message in the other repository. ("Iyyy"... is the Change-Id of your commit.) Note that Zuul does not react to this, it is just for the benefit of human readers. Also, Gerrit will automatically add backlinks based on the presence of Depends-On, regardless of any Needed-By.

Co-Authored-by: gerrit_username <gerrit_user_email@example.com>

Add this line before the Change-Id to credit other developers working on the change. You can add more than one separated by a line break.

Note that unlike other words in commit message footers, the word by is not capitalised; it's Co-Authored-by, not Co-Authored-By.

  1. This is a legacy from times when lines were provided on punched cards. Columns 1 to 72 where used for the statement and columns 73 to 80 for short comments. Size 72 is reasonable enough to understand the code at first glance.
  2. As with all headers/footers, write the name with words individually capitalised, with hyphens between (e.g. Hypothetical-Header-Or-Footer). Follow the name with a colon (":"), then one space. Similar to the Git commit, HTTP and Email headers, adding extra blank lines above the footer would cut off the footer and wrongly include the former part in the body.

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