How to Create and Maintain a Tap
Taps are external sources of Homebrew formulae, casks and/or external commands. They can be created by anyone to provide their own formulae, casks and/or external commands to any Homebrew user.
Creating a tap
A tap is usually a Git repository available online, but you can use anything as long as it’s a protocol that Git understands, or even just a directory with files in it. If hosted on GitHub, we recommend that the repository’s name start with homebrew-
so the short brew tap
command can be used. See the brew
manual page for more information on repository naming.
The brew tap-new
command can be used to create a new tap along with some template files:
$ brew tap-new $YOUR_GITHUB_USERNAME/homebrew-tap
Initialized empty Git repository in /opt/homebrew/Library/Taps/$YOUR_GITHUB_USERNAME/homebrew-tap/.git/
...
==> Created $YOUR_GITHUB_USERNAME/tap
/opt/homebrew/Library/Taps/$YOUR_GITHUB_USERNAME/homebrew-tap
This creates a local tap with the proper directory structure. Next, you can push it to a new GitHub repository by running (from any directory):
$ brew install gh
...
$ gh repo create $YOUR_GITHUB_USERNAME/homebrew-tap --push --public --source "$(brew --repository $YOUR_GITHUB_USERNAME/homebrew-tap)"
✓ Created repository $YOUR_GITHUB_USERNAME/homebrew-tap on github.com
https://github.com/$YOUR_GITHUB_USERNAME/homebrew-tap
✓ Added remote https://github.com/$YOUR_GITHUB_USERNAME/homebrew-tap.git
...
✓ Pushed commits to https://github.com/$YOUR_GITHUB_USERNAME/homebrew-tap.git
Assuming you leave the default .github/workflows
files in place,
“bottles” (binary packages) will be built and uploaded to GitHub Releases.
If you run brew tap-new --github-packages
, you can upload to GitHub Packages instead.
Tap formulae follow the same format as the core’s ones, and can be added under either the Formula
subdirectory, the HomebrewFormula
subdirectory or the repository’s root. The first available directory is used, other locations will be ignored. We recommend the use of subdirectories because it makes the repository organisation easier to grasp, and top-level files are not mixed with formulae.
See homebrew/core for an example of a tap with a Formula
subdirectory.
Creating your formula or cask
Run brew create
to create a formula or cask file in your tap and open it in your text editor:
$ brew create https://mirror.ibcp.fr/pub/gnu/wget/wget-1.25.0.tar.gz --tap $YOUR_GITHUB_USERNAME/homebrew-tap --set-name $YOUR_GITHUB_USERNAME-wget
==> Downloading from https://mirror.ibcp.fr/pub/gnu/wget/wget-1.25.0.tar.gz
...
Editing /opt/homebrew/Library/Taps/$YOUR_GITHUB_USERNAME/homebrew-tap/Formula/$YOUR_GITHUB_USERNAME-wget.rb
After that, follow the Adding Software to Homebrew guide to create your formula or cask file.
Finally, git add
, git commit
and git push
your formula or cask to your tap and others can use it too.
Naming your formulae to avoid clashes
If a formula in your tap has the same name as a Homebrew/homebrew-core formula they cannot be installed side-by-side. If you wish to create a different version of a formula that’s in Homebrew/homebrew-core (e.g. with option
s) consider giving it a different name; e.g. nginx-full
for a more full-featured nginx
formula. This will allow both nginx
and nginx-full
to be installed at the same time (assuming one is keg-only or the linked files do not clash).
Installing
There are two ways users can install formulae from your tap:
Direct installation (recommended)
Users can install any of your formulae directly with brew install user/repository/formula
. Homebrew will automatically add your tap before installing the formula:
$ brew install alice/homebrew-tap/my-script
==> Tapping alice/homebrew-tap
Cloning into '/opt/homebrew/Library/Taps/alice/homebrew-tap'...
...
==> Installing my-script from alice/homebrew-tap
This is the most convenient method for users as it requires only one command.
Manual tap installation
To install your tap without installing any formula at the same time, users can add it with the brew tap
command:
# For GitHub repositories
$ brew tap user/repository
# For repositories hosted elsewhere
$ brew tap user/repo <URL>
Where user
is your GitHub username, repository
is your repository name, and <URL>
is your Git clone URL for non-GitHub repositories.
After tapping, users can install your formulae either with:
brew install foo
if there’s no core formula with the same namebrew install user/repository/foo
to avoid conflicts with core formulae
Maintaining a tap
A tap is just a Git repository so you don’t have to do anything specific when making modifications, apart from committing and pushing your changes.
Updating
Once your tap is installed, Homebrew will update it each time a user runs brew update
. Outdated formulae will be upgraded when a user runs brew upgrade
, like core formulae.
Best practices
- Keep your tap up to date: Regularly update your formulae to the latest versions of the software you’re packaging
- Test your formulae: Before pushing changes, test your formulae locally with
brew install --build-from-source user/repository/formula
- Use semantic versioning: Tag your releases with version numbers (e.g.
1.0.0
) to make it easier for users to track changes - Provide clear documentation: Include a
README
in your tap repository explaining what your formulae do and how to use them - Handle dependencies: Make sure your formulae properly declare all dependencies using
depends_on
Troubleshooting
- Formula not found after installation: Make sure your formula file is in the correct location (
Formula/
subdirectory) and has the right file extension (.rb
). -
Installation fails: Check that your formula’s
url
andsha256
values are correct. You can verify the SHA256 with:curl -L <URL> | shasum -a 256
- Tap not updating: Users may need to run
brew untap user/repository && brew tap user/repository
to force a fresh clone of your tap. - Conflicts with core formulae: If your formula conflicts with a core formula, consider renaming it or making it keg-only.
Casks
Casks can also be installed from a tap. Casks can be included in taps with formulae, or in a tap with just casks. Place any cask files you wish to make available in a Casks
directory at the top level of your tap.
See homebrew/cask for an example of a tap with a Casks
subdirectory.
Naming
Unlike formulae, casks must have globally unique names to avoid clashes. This can be achieved by e.g. prepending the cask name with your GitHub username: username-formula-name
.
External commands
You can provide your tap users with custom brew
commands by adding them in a cmd
subdirectory. Read more on external commands.
See Homebrew/test-bot for an example of a tap with external commands.
Upstream taps
Some upstream software providers like to package their software in their own Homebrew tap. When their software is eligible for Homebrew/homebrew-core we prefer to maintain software there for ease of updates, improved discoverability and use of tools such as formulae.brew.sh.
We are not willing to remove software packaged in Homebrew/homebrew-core in favour of an upstream tap. We are not willing to instruct users of our formulae to use an upstream tap instead. If upstream projects have issues with how Homebrew packages your software: please file issues (or, ideally, pull requests) to address these problems.
There’s an increasing desire in commercial open source about “maintaining control” e.g. defining exactly what binaries are shipping to users. Not supporting users (or even software distributions) to build-from-source is antithetical to the values of open source. If you think Homebrew’s perspective is annoying on this: try and see how Debian responds to requests to ship your binaries.