People with admin or owner permissions can set up a CODEOWNERS file in a repository.
The people you choose as code owners must have write permissions for the repository. When the code owner is a team, that team must be visible and it must have write permissions, even if all the individual members of the team already have write permissions directly, through organization membership, or through another team membership.
About code owners
Code owners are automatically requested for review when someone opens a pull request that modifies code that they own. Code owners are not automatically requested to review draft pull requests. For more information about draft pull requests, see "About pull requests." When you mark a draft pull request as ready for review, code owners are automatically notified. If you convert a pull request to a draft, people who are already subscribed to notifications are not automatically unsubscribed. For more information, see "Changing the stage of a pull request."
When someone with admin or owner permissions has enabled required reviews, they also can optionally require approval from a code owner before the author can merge a pull request in the repository. For more information, see "About protected branches."
If a team has enabled code review assignments, the individual approvals won't satisfy the requirement for code owner approval in a protected branch. For more information, see "Managing code review assignment for your team."
CODEOWNERS file location
To use a CODEOWNERS file, create a new file called CODEOWNERS in the root, docs/, or .github/ directory of the repository, in the branch where you'd like to add the code owners.
Each CODEOWNERS file assigns the code owners for a single branch in the repository. Thus, you can assign different code owners for different branches, such as @octo-org/codeowners-team for a code base on the default branch and @octocat for a GitHub Pages site on the gh-pages branch.
For code owners to receive review requests, the CODEOWNERS file must be on the base branch of the pull request. For example, if you assign @octocat as the code owner for .js files on the gh-pages branch of your repository, @octocat will receive review requests when a pull request with changes to .js files is opened between the head branch and gh-pages.
CODEOWNERS syntax
A CODEOWNERS file uses a pattern that follows most of the same rules used in gitignore files, with some exceptions. The pattern is followed by one or more GitHub usernames or team names using the standard @username or @org/team-name format. Users must have read access to the repository and teams must have explicit write access, even if the team's members already have access. You can also refer to a user by an email address that has been added to their account on your GitHub Enterprise Server instance, for example user@example.com.
If any line in your CODEOWNERS file contains invalid syntax, the file will not be detected and will not be used to request reviews.
Example of a CODEOWNERS file
# This is a comment.
# Each line is a file pattern followed by one or more owners.
# These owners will be the default owners for everything in
# the repo. Unless a later match takes precedence,
# @global-owner1 and @global-owner2 will be requested for
# review when someone opens a pull request.
* @global-owner1 @global-owner2
# Order is important; the last matching pattern takes the most
# precedence. When someone opens a pull request that only
# modifies JS files, only @js-owner and not the global
# owner(s) will be requested for a review.
*.js @js-owner
# You can also use email addresses if you prefer. They'll be
# used to look up users just like we do for commit author
# emails.
*.go docs@example.com
# Teams can be specified as code owners as well. Teams should
# be identified in the format @org/team-name. Teams must have
# explicit write access to the repository. In this example,
# the octocats team in the octo-org organization owns all .txt files.
*.txt @octo-org/octocats
# In this example, @doctocat owns any files in the build/logs
# directory at the root of the repository and any of its
# subdirectories.
/build/logs/ @doctocat
# The `docs/*` pattern will match files like
# `docs/getting-started.md` but not further nested files like
# `docs/build-app/troubleshooting.md`.
docs/* docs@example.com
# In this example, @octocat owns any file in an apps directory
# anywhere in your repository.
apps/ @octocat
# In this example, @doctocat owns any file in the `/docs`
# directory in the root of your repository and any of its
# subdirectories.
/docs/ @doctocat
# In this example, @octocat owns any file in the `/apps`
# directory in the root of your repository except for the `/apps/github`
# subdirectory, as its owners are left empty.
/apps/ @octocat
/apps/github
Syntax exceptions
There are some syntax rules for gitignore files that do not work in CODEOWNERS files:
- Escaping a pattern starting with
#using\so it is treated as a pattern and not a comment - Using
!to negate a pattern - Using
[ ]to define a character range
CODEOWNERS and branch protection
Repository owners can add branch protection rules to ensure that changed code is reviewed by the owners of the changed files. For more information, see "About protected branches."
Example of a CODEOWNERS file
# In this example, any change inside the `/apps` directory
# will require approval from @doctocat.
/apps/ @doctocat
# In this example, any change inside the `/apps` directory
# will require approval from @doctocat or @octocat.
/apps/ @doctocat @octocat
# In this example, any change inside the `/apps` directory
# will require approval from a member of the @example-org/content team.
# If a member of @example-org/content opens a pull request
# with a change inside the `/apps` directory, their approval is implicit.
# The team is still added as a reviewer but not a required reviewer.
# Anyone can approve the changes.
/apps/ @example-org/content-team