oam/knowledge base/homebrew.md

Homebrew

TL;DR

# Install/uninstall on OS X.
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)"

# Search for formulae.
brew search parallel
brew search --cask gpg

# Install something.
brew install gettext
brew install --cask spotify

# Uninstall something
brew uninstall --zap keybase

# Get formulae's dependencies.
brew deps
brew deps --installed azure-cli
brew deps --tree

# Get information on formulae.
brew info sponge

# Prevent a formula from upgrading.
brew pin gnupg2

# Bring an installation up to speed from a Brewfile.
brew bundle
brew bundle --global
brew bundle --file $HOME/Brewfile --no-lock

# Dump all installed casks/formulae/images/taps into a Brewfile in the current
# directory.
brew bundle dump

Configuration

# Require SHA check for casks.
# Change cask installation dir to the Application folder in the user's HOME.
export HOMEBREW_CASK_OPTS="--require-sha --appdir $HOME/Applications"

# Print install times for each formula at the end of the run.
export HOMEBREW_DISPLAY_INSTALL_TIMES=1

# Do not automatically update before running some commands.
export HOMEBREW_NO_AUTO_UPDATE=1

# Do not print HOMEBREW_INSTALL_BADGE on a successful build.
export HOMEBREW_NO_EMOJI=1

# Do not use the GitHub API.
# Avoid searches or fetching relevant issues after a failed install.
export HOMEBREW_NO_GITHUB_API=1

# Forbid redirects from secure HTTPS to insecure HTTP.
export HOMEBREW_NO_INSECURE_REDIRECT=1

# Only list updates to installed software.
export HOMEBREW_UPDATE_REPORT_ONLY_INSTALLED=1

# Pass the -A option when calling sudo.
export SUDO_ASKPASS=1

Downgrade an application to a non-managed version

The easy way

brew unlink kubernetes-helm
brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/ed9dcb2cb455a816f744c3ad4ab5c18a0d335763/Formula/kubernetes-helm.rb
brew switch kubernetes-helm 2.13.0

The hard way

source alternative source

formula_name='kubernetes-helm'
formula_version='2.13.1'

cd $(brew --repository)/Library/Tapshomebrew/homebrew-core
git log master -S${formula_version} -- Formula/${formula_name}.rb
commit_id='<something>'  # insert commit id

git checkout -b ${formula_name}-${formula_version} ${commit_id}
HOMEBREW_NO_AUTO_UPDATE=1 brew install ${formula_name}
# pin application if needed

git checkout master
git branch -d ${formula_name}-${formula_version}

Gotchas

• moreutils installs its own old version of parallel, which conflicts with the parallel formulae; install the standalone gettext, parallel and sponge to have their recent version

Further readings

• manpage
• Homebrew bundle

Sources

• How to stop homebrew from upgrading itself on every run
• macOS migrations with Brewfile