Check if the required packages are installed or not; the script was originally intended for https://wiki.lineageos.org/emulator

list_not_installed_pkg.sh

#!/bin/bash

# Define the list of packages
packages=(
  bc bison ccache curl flex git git-lfs gnupg gperf imagemagick
  lib32-readline lib32-zlib libelf liblz4 libsdl2 libssl libxml2
  lzop rsync schedtool squashfs-tools xsltproc zip zlib
)

# Initialize an empty array to hold missing packages
missing_packages=()

# Loop through each package to check if it is installed
for pkg in "${packages[@]}"; do
  if pacman -Qs $pkg > /dev/null; then
    echo "$pkg is installed."
  else
    echo "$pkg is NOT installed."
    missing_packages+=($pkg)
  fi
done

# Print the missing packages, if any
if [ ${#missing_packages[@]} -ne 0 ]; then
  echo "The following packages are missing:"
  for missing in "${missing_packages[@]}"; do
    echo $missing
  done
else
  echo "All packages are installed."
fi