install-package

#!/bin/bash
# Package installer with caching, version 2.2

show_usage_and_exit() {
  echo -e "Package installer that caches packages\n"
  echo -e "Usage: install-package [--update] [--skip-update] [--update-new] pkg1[=version] [pkg2[=version]] [-o APT::Option] ...\n"
  echo "--update            Forces repository list update before installing the packages"
  echo "--skip-update       Skips repository list update"
  echo "--update-new        Update only repository lists added in the last 1h"

  exit 1
}

skip_global_update() {
  touch "$apt_update_ran"
}

update_repo_lists() {
  echo ">> Updating repository lists and keys..."

  sudo apt-key update
  sudo apt-get update

  skip_global_update
}

install_packages() {
  echo ">> Installing packages..."

  sudo apt-get install -y --force-yes -o Dir::Cache::archives="$temp_deb_store" "${packages[@]}"
}

unpack_pkg_archive_if_available() {
    echo ">> Unpacking package archive..."

    cache restore install_package_cache

    skip_global_update
}

archive_packages() {
  echo ">> Storing packages in archive..."

  sudo chown "$USER" -R "$temp_deb_store"

  cache store install_package_cache "$temp_deb_store"
}

init() {
  deb_cache_base_name=".deb-cache"
  temp_deb_store="/home/$(whoami)/$deb_cache_base_name"
  apt_update_ran="/tmp/.apt_update_ran"

  mkdir -p "$temp_deb_store"
}

run_selective_update() {
  recently_modified_lists=$(find /etc/apt/sources.list.d/ -name "*.list" -type f -mmin -59)

  if [ -n "${recently_modified_lists}" ]; then
    for list in $recently_modified_lists; do
      echo "* pulling from: $list"
      sudo apt-get update -o Dir::Etc::sourcelist="$list" -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"
    done
  else
    echo "* no PPA list found which is modified in the last hour"
  fi
}

# Show usage and exit if no arguments provided
[[ $# -eq 0 ]] && show_usage_and_exit

init

unpack_pkg_archive_if_available

POSITIONAL=()

while [ $# -gt 0 ]; do
  case "$1" in
    --skip-update | -s )
      echo "* global package lists will not be updated"
      skip_global_update

      shift
      ;;
    --update | -u )
      echo "* global package list update will run"
      rm -f $apt_update_ran

      shift
      ;;
    --update-new | -n )
      echo "* only the recent package lists will be updated"
      skip_global_update

      run_selective_update

      shift
      ;;
    * )
      POSITIONAL+=("$1")

      shift
      ;;
  esac
done

set -- "${POSITIONAL[@]}"

# Run apt-get update if flag is not set
[[ ! -f $apt_update_ran ]] && update_repo_lists

packages=("$@")

if install_packages;then 
  if archive_packages;then
    echo ">> Finished successfully."
  fi
else
  echo ">> Errors have occured during package installation."
  exit 1
fi