legacy-check

#!/usr/bin/env zsh
# macos-scripts/legacy-check

# legacy-check
#   Check for 32-bit applications
#   Check for loaded and on disk third party kernel extensions

set -euo pipefail
# -e exit if any command returns non-zero status code
# -u prevent using undefined variables
# -o pipefail force pipelines to fail on first non-zero status code


IFS=$'\n\t'
# Set Internal Field Separator to newlines and tabs
# This makes bash consider newlines and tabs as separating words
# See: http://redsymbol.net/articles/unofficial-bash-strict-mode/


function get_x86_applications {
  # get_x86_applications
  #   Can also use:
  #     mdfind "kMDItemExecutableArchitectures == '*i386*' && kMDItemExecutableArchitectures != '*x86*'"
  #     Via @rtrouton https://twitter.com/rtrouton/status/1130482310762115072
  #   See also: https://eclecticlight.co/2019/05/22/how-to-find-all-your-32-bit-apps-a-non-buyers-guide/

  while IFS=$'\n' read -r app; do 
    x86_apps+=("${app}"); 
  done < <(system_profiler SPApplicationsDataType \
            | grep -E '^    .*:$|64-Bit \(Intel\):|Location' \
            | grep -A1 ': No' \
            | grep 'Location' \
            | sed -e 's/.*Location: //' )
  # Massive thanks to @MacLemon for this oneliner
}


function get_kexts {
  # get_kexts
  #   Get list of loaded non apple kexts via kmutil
  #   Could also use kextstat but that calls kmutil
  #   Get list of third party kexts in /Library/Extensions/

  while IFS=$'\n' read -r app; do 
    loaded_kernel_extensions+=("${kext}"); 
  done < <(kmutil showloaded --show loaded --variant-suffix release \
          | grep -v 'com.apple' \
          | tail -n +2 \
          | head -n 3 \
          | awk '{print $6}')

  on_disk_kernel_extensions=(/Library/Extensions/*)
}


function main {

  declare -a x86_apps
  declare -a loaded_kernel_extensions
  declare -a on_disk_kernel_extensions
  
  
  get_x86_applications
  
  if ! [[ ${#x86_apps[@]} -eq 0 ]]; then
    echo "32-bit applications:"

    for app in "${x86_apps[@]}"; do
      echo "  ${app}"
    done
  else
    echo "No 32-bit applications found"
  fi 
  

  get_kexts

  if ! [[ ${#loaded_kernel_extensions[@]} -eq 0 ]]; then
    echo "Loaded third party Kernel Extensions:"

    for kext in "${loaded_kernel_extensions[@]}"; do
      echo "  ${kext}"
    done
  else
    echo "No loaded third party Kernel Extensions found"
  fi

  if ! [[ ${#on_disk_kernel_extensions[@]} -eq 0 ]]; then
    echo "On disk third party Kernel Extensions:"

    for kext in "${on_disk_kernel_extensions[@]}"; do
      echo "  ${kext}"
    done
  else
    echo "No on disk third party Kernel Extensions found"
  fi
}

main "$@"