install_homebrew.sh

#!/usr/bin/env bash

# SOURCE: https://github.com/Lanjelin/unraid/blob/main/unraid-brew/README.md

# Where we store the actual bins -- should be on ssd/nvme
# Use drive directly, and not via /mnt/user/
# Makes a huge impact on performance
UNRAID_BREW_PATH=/mnt/cache/appdata/linuxbrew
UNRAID_BASH=0
UNRAID_ZSH=0

_ub_install() {
  # Make the path if it doesn't exist
  mkdir -p "$UNRAID_BREW_PATH"

  # We want gcc -- unraid seems to already be shipped with procps curl file git
  if ! command -v gcc >/dev/null 2>&1; then
    echo "Installing gcc"
    if [ ! -f "$UNRAID_BREW_PATH"/slackware64/d/gcc-14.2.0-x86_64-2.txz ]; then
      curl --output-dir "$UNRAID_BREW_PATH" -sO https://slackware.uk/slackware/slackware64-current/slackware64/d/gcc-14.2.0-x86_64-2.txz
    fi
    installpkg "$UNRAID_BREW_PATH"/slackware64/d/gcc-14.2.0-x86_64-2.txz >/dev/null
  fi

  # Remove and relink home, instead of verifying everything
  rm /home/linuxbrew >/dev/null 2>&1
  ln -s "$UNRAID_BREW_PATH" /home/linuxbrew

  # brew doctor says we want this
  chmod 755 /usr/local/lib

  # Create the user if it doesn't exist
  if ! id linuxbrew >/dev/null 2>&1; then
    useradd --system --uid 95 --gid 100 --no-user-group --home-dir /home/linuxbrew linuxbrew
  fi

  # Install Homebrew if it doesn't exist
  if [ ! -f /home/linuxbrew/.linuxbrew/bin/brew ]; then
    cd /home/linuxbrew
    NONINTERACTIVE=1 su linuxbrew /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
    cd - >/dev/null
  fi
}

_ub_remove() {
  userdel linuxbrew
  rm /home/linuxbrew
  rm -r "$UNRAID_BREW_PATH"
}

_ub_rc() {
  echo '' >>/root/"$1"
  echo 'eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"' >>/root/"$1"
  echo 'brew () {' >>/root/"$1"
  echo '  cd /home/linuxbrew' >>/root/"$1"
  echo '  su linuxbrew -s /home/linuxbrew/.linuxbrew/bin/brew -- "$@"' >>/root/"$1"
  echo '  cd - > /dev/null' >>/root/"$1"
  echo '}' >>/root/"$1"
}

_main() {
  if [ "$1" ]; then
    if [ "$1" == "rm" ] ||
      [ "$1" == "del" ] ||
      [ "$1" == "remove" ] ||
      [ "$1" == "delete" ] ||
      [ "$1" == "uninstall" ]; then
      _ub_remove
      echo "Done removing homebrew!"
      exit 0
    elif [ "$1" == "bash" ] ||
      [ "$1" == "zsh" ]; then
      if [ "$1" == "bash" ]; then
        UNRAID_BASH=1
      fi
      if [ "$1" == "zsh" ]; then
        UNRAID_ZSH=1
      fi
    else
      echo "Unsupported argument $1"
      exit 1
    fi
  fi

  _ub_install
  echo
  if [ "$UNRAID_BASH" == 1 ]; then
    _ub_rc ".bashrc"
    echo "Setting up .bashrc"
  fi
  if [ "$UNRAID_ZSH" == 1 ]; then
    _ub_rc ".zshrc"
    echo "Setting up .zshrc"
  fi
  if [ -f /home/linuxbrew/.linuxbrew/bin/brew ]; then
    echo "Homebrew is ready to use!"
    exit 0
  else
    echo "Something went wrong during installation."
    exit 1
  fi
}

_main "$@"