#!/bin/bash

declare status=0

if ! which lsb_release >/dev/null; then
  status=3
  error=""
else
  distribution="$(lsb_release -is)"
  release="$(lsb_release -cs)"

  case "$distribution" in
    Debian)
      case "$release" in
        bo)
          status=2
          error="EOL of $release is absolutely expired."
        ;;
        rex)
          status=2
          error="EOL of $release is absolutely expired."
        ;;
        buzz)
          status=2
          error="EOL of $release is absolutely expired."
        ;;
        hamm)
          exp_date="19990309"
        ;;
        slink)
          exp_date="20001030"
        ;;
        potato)
          exp_date="20030630"
        ;;
        woody)
          exp_date="20060630"
        ;;
        sarge)
          exp_date="20080330"
        ;;
        etch)
          exp_date="20100215"
        ;;
        lenny)
          exp_date="20120201"
        ;;
        squeeze)
          status=0
        ;;
        *)
          status=3
          error="Release ($release) unknown in script."
        ;;
      esac
    ;;
    Ubuntu)
      case $(lsb_release -cs) in
        warty)
          exp_date="20060430"
        ;;
        hoary)
          exp_date="20061031"
        ;;
        breezy)
          exp_date="20070413"
        ;;
        dapper)
          exp_date="20110601"
        ;;
        edgy)
          exp_date="20080425"
        ;;
        feisty)
          exp_date="20081019"
        ;;
        gutsy)
          exp_date="20090418"
        ;;
        hardy)
          exp_date="20130401"
        ;;
        intrepid)
          exp_date="20100430"
        ;;
        jaunty)
          exp_date="20101023"
        ;;
        karmic)
          exp_date="20110430"
        ;;
        lucid)
          exp_date="20150401"
        ;;
        maverick)
          exp_date="20120401"
        ;;
        natty)
          exp_date="20121001"
        ;;
        oneiric)
          exp_date="20130401"
        ;;
        precise)
          exp_date="20170401"
        ;;
        *)
          status=3
          error="Release ($release) unknown in script."
        ;;
      esac
    ;;
    *)
      case $(lsb_release -sd) in
        '"Arch Linux"')
          status=0
          error="ArchLinux is a rolling release distribution. So no release updates are required."
        ;;
        *)
          status=3
          error="Distribution ($distribution) unknown in script."
        ;;
      esac
    ;;
  esac
fi

if [ $status -eq 0 ]; then
  if [ -n "$exp_date" ]; then
    if [ "$exp_date" -lt "$(date +%Y%m%d)" ]; then
      status=2
      error="EOL of $release has expired ($(date -d "$exp_date" +%d.%m.%Y))."
    else
      error="EOL of $release has not expired ($(date -d "$exp_date" +%d.%m.%Y))."
    fi
  else
    error="EOL of $release has not expired."
  fi
fi

if [ "$status" -eq 0 ]; then
  echo "[OK] $error"
else
  echo "[CRITICAL] $error"
fi

exit "$status"