Setup dual-architecture Homebrew on a M1 Mac.

homebrew+rosetta2-setup.sh

# Setup dual-architecture Homebrew on a M1 Mac.

# 1. Install Rosetta (if necessary):
softwareupdate --install-rosetta

# 2. Install Homebrew for M1:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

# 2. Install Homebrew for Rosetta:
arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

# 3. Alias brew_x86 to the ARM version of Rosetta.
echo 'alias brew_x86="arch -x86_64 /usr/local/bin/brew"' >> ~/.zshrc

# 4. Verify that everything worked:
which brew        # Should be: /opt/homebrew/bin/brew
brew --prefix     # Should be: /opt/homebrew
which brew_x86    # Should be: arch -x86_64 /usr/local/bin/brew
brew_x86 --prefix # Should be: /usr/local

# Uninstall Homebrew:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall.sh)" # Uninstall Rosetta brew
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall.sh)" # Uninstall M1 brew