Installing Homebrew via Script with PKG File

#!/bin/bash
# Function to check if Command Line Tools are installed
check_clt() {
   if ! xcode-select -p &>/dev/null; then
       echo "########## XCODE COMMAND LINE TOOL #############"
       echo "Command Line Tools not found."
       echo "Kindly Install the latest version of Xcode from the App Store"
       echo "Once Installed, re-run the script...."
       exit 1
   else
       echo "########## XCODE COMMAND LINE TOOL #############"
       echo "Command Line Tools are already installed."
       echo "Xcode Command Line Tool path: $(xcode-select -p)"
       install_homebrew
   fi
}

# Function to install Homebrew via PKG
install_homebrew() {
   # Figure out logged-in user
   loggedInUser=$(stat -f %Su /dev/console)

   # Figure out home directory.
   homeDir=$(dscl . -read /users/$loggedInUser | grep NFSHomeDirectory | awk '{print $2}')

   # Create log filename with the current date
   log_file="/Library/Addigy/ansible/packages/Charles HomeBrew Installation (1.3)/install_HomeBrew_$(date +'%Y-%m-%d').log"

   # Fetch the latest Homebrew PKG URL
   download_URL=$(/usr/bin/curl -fs "https://api.github.com/repos/Homebrew/brew/releases/latest" | \
   awk -F '"' '/browser_download_url/ && /pkg/ { print $4 }')

   if [[ -z "$download_URL" ]]; then
       echo "Failed to fetch the Homebrew download URL. Exiting."
       exit 1
   fi

   # Download the Homebrew PKG
   echo ""
   echo "############# DOWNLOADING HOMEBREW PKG FILE #################"
   echo "Downloading Homebrew PKG from: $download_URL"
   pkg_download_file="Homebrew-latest.pkg"
   /usr/bin/curl -L "$download_URL" -o "$pkg_download_file" >> "$log_file" 2>&1

   if [ ! -f "$pkg_download_file" ]; then
       echo "Error: Failed to download the Homebrew PKG."
       exit 1
   fi

   # Install the Homebrew PKG
   echo ""
   echo "############# INSTALLING HOMEBREW PKG FILE #################"
   echo "Installing Homebrew..."
   sudo installer -pkg "$pkg_download_file" -target / -verbose >> "$log_file" 2>&1

   if [ $? -eq 0 ]; then
       echo "Homebrew installed successfully."
   else
       echo "Error: Homebrew installation failed."
       exit 1
   fi

   # Clean up the downloaded PKG file
   echo ""
   echo "############# CLEANING HOMEBREW PKG FILE #################"
   echo "Cleaning up downloaded PKG..."
   rm -f "$pkg_download_file"

   # Determine Homebrew installation path based on architecture
   if [[ "$(arch)" == "i386" ]]; then
       echo ""
       echo "######### ARCH TYPE #############"
       echo "Arch: Intel"
       homebrew_dir="/usr/local/Homebrew/bin/brew"
   else
       echo ""
       echo "######### ARCH TYPE #############"
       echo "Arch: Apple Silicon"
       homebrew_dir="/opt/homebrew/bin/brew"
   fi


   # Check if Homebrew is installed by looking for its binary in common installation path
   if [[ -f "$homebrew_dir" ]]; then
       echo ""
       echo "#############HOMEBREW INFORMATION ###################"
       echo "Homebrew is installed."
       echo "PATH: $homebrew_dir"

       # Grabbing the version for confrimation
       # Homebrew version
       sudo -u "$loggedInUser" /bin/bash -c "HOME=$homeDir; $homebrew_dir --version"


       # Homebrew getitng register in the log file
       echo "Homebrew is installed." >> "$log_file" 2>&1
       echo "PATH: $homebrew_dir" >> "$log_file" 2>&1

       sudo -u "$loggedInUser" /bin/bash -c "HOME=$homeDir; $homebrew_dir --version" >> "$log_file" 2>&1

       exit 0

   else
       echo "Homebrew Common installtion Path are not used. Either the installtion is path different or the installtion was incomplete..."
       exit 1
   fi

}

# Main script execution
check_clt

Breakdown:

1. Check for Command Line Tools (check_clt):
   • It verifies if Command Line Tools are already installed using xcode-select -p. If they are not found, the script prompts the user to install them manually via the app store. If CLT is installed, the script continues by calling the function to install Homebrew.
     
     
2. Install Homebrew (install_homebrew):
   • Determine Logged-in User: It identifies the logged-in user and their home directory.
   • Log File: Create a log file to track the installation process.
   • Download Homebrew PKG: The script fetches the latest Homebrew package from GitHub using the API and downloads the .pkg file.
   • Install Homebrew: It installs Homebrew using the downloaded package. The process is logged for auditing purposes.
   • Cleanup: After installation, it deletes the downloaded package.
   • Architecture Detection: Based on the system's architecture (Intel or Apple Silicon), it identifies where Homebrew should be installed (/usr/local for Intel, /opt/homebrew for Apple Silicon).
   • Homebrew Verification: It verifies that Homebrew was installed successfully by checking for its binary, displaying the version, and logging the information.
     
     
3. Main Execution:
   • The script starts by calling check_clt, which then either exits if CLT is not present or proceeds to install Homebrew if they are.