Initial commit, untested.

Scripts/install-brew.sh

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+#!/bin/bash
+
+# This script uses the unsupported installation method descripted here:
+# https://docs.brew.sh/Installation#untar-anywhere-unsupported
+
+# This makes it possible to run this script as root and non-interactive.
+
+# Script must be run as root
+if [ "$(id -u)" != "0" ]; then
+   echo "This script must be run as root. Exiting.." 1>&2
+   exit 1
+fi
+
+# Define current user and home directory
+user=$(stat -f%Su /dev/console)
+HOME=/Users/$user
+
+# Create homebrew directory in /opt
+cd /opt
+mkdir ./homebrew
+
+# Download and extract homebrew
+curl -L https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C homebrew
+
+# Change ownership to current user
+chown -R $user /opt/homebrew
+
+# Update brew
+sudo -u $user /opt/homebrew/bin/brew update --force --quite
+
+# Export env
+echo "export PATH=$PATH:/opt/homebrew/bin" >> "$HOME/.zshrc"
+
+## Optional: Install XCode Command Line Tools
+
+# Temporary file to make 'softwareupdate' list the Command Line  Tools
+touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
+
+# Get the latest version of the Command Line Tools
+latest="/usr/sbin/softwareupdate -l | grep -B 1 -E 'Command Line Tools' | awk -F '*' '/^ *\\*/ {print $2}' | sed -e 's/^ *Label: //' -e 's/^ *//' | sort -V | tail -n1"
+
+# Install latest version
+/usr/sbin/softwareupdate -i "${latest}"
+
+# Set correct path
+/usr/bin/xcode-select --switch /Library/Developer/CommandLineTools
+
+# Delete temporary file
+rm /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
+
+exit 0