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added uninstall and README
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‎README.md‎

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# M1_native_homebrew
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Install homebrew in native mode on Apple MacOS Arm (M1)
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# Using CLI/Terminal on Apple M1 (MacOS Big Sur)
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## `install_homebrew_native.sh`
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* install Homebrew in native mode (without Rosetta 2) on a fresh Apple M1 Arm computer (MacOS Big Sur)
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* run as: `curl -s https://raw.githubusercontent.com/pforret/macos_m1_cli/main/install_homebrew_native.sh | bash`
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## Using native Homebrew
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* as long as Homebrew does not officially support Apple M1 ARM architecture,
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you will get the following warning every time you try to `brew install` a package
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Warning: You are running macOS on a arm64 CPU architecture.
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We do not provide support for this (yet).
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Reinstall Homebrew under Rosetta 2 until we support it.
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You will encounter build failures with some formulae.
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Please create pull requests instead of asking for help on Homebrew's GitHub,
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Twitter or any other official channels. You are responsible for resolving
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any issues you experience while you are running this
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unsupported configuration.
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* you can however install the package by using `brew1 install`,
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which is short for `brew --build-from-source install`
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* the installation will probably work, but it's not guaranteed.
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You are an early adopter, doing bleeding edge stuff, not for the faint of heart.
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## `uninstall_homebrew_native.sh`
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* if you prefer running in 'Rosetta 2' mode, you can uninstall the native mode Homebrew.
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* run as: `curl -s https://raw.githubusercontent.com/pforret/macos_m1_cli/main/uninstall_homebrew_native.sh | bash`
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## My Homebrew configuration
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This is my config (on Mac Mini M1):
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HOMEBREW_VERSION: 2.6.2-91-g9db324a
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ORIGIN: https://github.com/Homebrew/brew
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HEAD: 9db324ab7a28446debcb407859c9ac184594a772
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Last commit: 6 hours ago
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Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
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Core tap HEAD: 72f2ab4cf6ab6cf12044f083c0e062876357bf04
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Core tap last commit: 2 hours ago
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Core tap branch: master
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HOMEBREW_PREFIX: /opt/homebrew
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HOMEBREW_CASK_OPTS: []
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HOMEBREW_MAKE_JOBS: 8
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Homebrew Ruby: 2.6.3 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
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CPU: octa-core 64-bit arm_firestorm_icestorm
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Clang: 12.0 build 1200
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Git: 2.24.3 => /Library/Developer/CommandLineTools/usr/bin/git
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Curl: 7.64.1 => /usr/bin/curl
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macOS: 11.0-arm64
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CLT: 12.3.0.0.1.1607026830
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Xcode: N/A
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Rosetta 2: false

‎install_homebrew_native.sh‎

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#!/bin/bash
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set -uo pipefail
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echo "### $0 from pforret/macos_m1_cli"
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die(){
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echo "$1" >&2
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tput bel
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echo "Quitting script!" >&2
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exit 1
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}
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if [[ -x "/opt/homebrew/bin/brew" ]] ; then
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echo "Homebrew is already installed at [/opt/homebrew/bin], quitting script!" >&2
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/opt/homebrew/bin/brew update
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/opt/homebrew/bin/brew update > /dev/null
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/opt/homebrew/bin/brew config | grep VERSION
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exit 1
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die "Homebrew is already installed at [/opt/homebrew/bin]"
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fi
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# Sanity check, only run on MacOs in native mode
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[[ $(uname) == "Darwin" ]] || die "This script should only be run on a MacOS machine"
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[[ $(uname -m) == "arm64" ]] || die "This script should only be run in native mode, not with Rosetta 2"
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[[ $UID -eq 0 ]] && die "You should not be root to run this script"
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# first run git to initiate download of developer tools
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echo "* Check if git is installed ..."
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git version || echo "If you get a popup asking to install 'developer tools', please say yes" >&2
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echo "* If you get a MacOS popup asking to install 'developer tools', please confirm"
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git version
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echo "* Create a folder for Homebrew ..."
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cd /opt && sudo mkdir homebrew
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if [[ ! -f "/opt/homebrew" ]] ; then
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echo "Folder [/opt/homebrew] could not be created, quitting script!" >&2
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exit 1
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fi
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[[ -d "/opt/homebrew" ]] || die "Folder [/opt/homebrew] could not be created"
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sudo chown -R "$(whoami)" /opt/homebrew
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echo "* Download and install Homebrew ..."
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echo "* Download and install Homebrew from Github ..."
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# cf https://docs.brew.sh/Installation.
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curl -L "https://github.com/Homebrew/brew/tarball/master" | tar xz --strip 1 -C homebrew
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if [[ ! -x "/opt/homebrew/bin/brew" ]] ; then
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echo "Executable [/opt/homebrew/bin/brew] not found, quitting script!" >&2
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exit 1
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fi
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[[ -x "/opt/homebrew/bin/brew" ]] || die "Executable [/opt/homebrew/bin/brew] not found"
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startup_config(){
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comment="#M1HBnat"
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echo "## /opt/homebrew is homebrew for native Apple ARM M1 mode $comment"
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echo "export PATH=/opt/homebrew/bin:\$PATH $comment"
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echo "alias brew1 \"brew --build-from-source\" $comment"
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}
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case $(basename "$SHELL") in
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zsh)
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echo "* Adding [/opt/homebrew/bin] to your zsh startup config path"
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echo "export PATH=/opt/homebrew/bin:$PATH" >> ~/.zshrc
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startup_config >> ~/.zshrc
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;;
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bash)
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echo "* Adding [/opt/homebrew/bin] to your bash startup config path"
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echo "export PATH=/opt/homebrew/bin:$PATH" >> ~/.bashrc
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startup_config >> ~/.bashrc
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;;
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*)
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echo "Please add [/opt/homebrew/bin] to your path, could not be done automatically" >&2
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echo "Add the following to your shell startup script, could not be done automatically" >&2
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echo "#####"
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startup_config
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echo "#####"
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esac
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echo "* Running brew a first time to trigger compilation"
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/opt/homebrew/bin/brewbrew install --build-from-source -q awk 2> /dev/null
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/opt/homebrew/bin/brew install --build-from-source -q awk 2> /dev/null
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echo "* Homebrew was installed as native binary. Version will be > 2.6"
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/opt/homebrew/bin/brew config | grep VERSION
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echo "* Installation using 'brew install' will give a warning as long as Homebrew is not yet officially released for M1"
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echo "* You can use 'brew1 install' to always build from source and skip that warning"
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echo "* You might get build errors, but remember: you are now doing bleeding edge CLI Terminal!"
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echo "* Rosetta 2 should be 'false'"
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/opt/homebrew/bin/brew config | grep Rosetta
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echo "> Close this Terminal and start a new one to make sure brew is in the path"

‎uninstall_homebrew_native.sh‎

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#!/bin/bash
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set -uo pipefail
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echo "### $0 from pforret/macos_m1_cli"
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die(){
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echo "$1" >&2
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tput bel
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echo "Quitting script!" >&2
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exit 1
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}
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[[ -x "/opt/homebrew/bin/brew" ]] || die "Homebrew is not installed on [/opt/homebrew]"
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# Sanity check, only run on MacOs in native mode
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[[ $(uname) == "Darwin" ]] || die "This script should only be run on a MacOS machine"
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[[ $(uname -m) == "arm64" ]] || die "This script should only be run in native mode, not with Rosetta 2"
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[[ $UID -eq 0 ]] && die "You should not be root to run this script"
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echo "* Create a folder for Homebrew ..."
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cd /opt && sudo mkdir homebrew
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[[ -d "/opt/homebrew" ]] || die "Folder [/opt/homebrew] could not be created"
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sudo chown -R "$(whoami)" /opt/homebrew
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echo "* Download and install Homebrew from Github ..."
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# cf https://docs.brew.sh/Installation.
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curl -L "https://github.com/Homebrew/brew/tarball/master" | tar xz --strip 1 -C homebrew
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[[ -x "/opt/homebrew/bin/brew" ]] || die "Executable [/opt/homebrew/bin/brew] not found"
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remove_from_config(){
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comment="#M1HBnat"
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conffile="$1"
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tempfile="$1.tmp"
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< "$conffile" grep -v "$comment" > "$tempfile"
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[[ -f "$tempfile" ]] && [[ $(< "$tempfile" wc -l) -gt 0 ]] && mv "$conffile" "$conffile.bak" && mv "$tempfile" "$conffile"
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}
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case $(basename "$SHELL") in
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zsh)
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echo "* Removing [/opt/homebrew/bin] from your zsh startup config path"
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remove_from_config ~/.zshrc
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;;
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bash)
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echo "* Removing [/opt/homebrew/bin] from your bash startup config path"
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remove_from_config ~/.bashrc
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;;
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*)
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echo "* Remove all lines mentioning /opt/homebrew from your startup scripts: " >&2
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sleep 1
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esac
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echo "* Deleting Homebrew from [/opt/homebrew]"
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sudo rm -fr /opt/homebrew

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