module-puppetlabs-apt/manifests/update.pp

class apt::update {
  #TODO: to catch if $::apt_update_last_success has the value of -1 here. If we
  #opt to do this, a info/warn would likely be all you'd need likely to happen
  #on the first run, but if it's not run in awhile something is likely borked
  #with apt and we'd want to know about it.

  if $::apt::always_apt_update == false {
    #if always_apt_update is true there's no point in parsing this logic.

    case $apt::apt_update_frequency {
      'always': {
        $_kick_apt = true
      }
      'daily': {
        #compare current date with the apt_update_last_success fact to determine
        #if we should kick apt_update.
        $daily_threshold = (strftime('%s') - 86400)
        if $::apt_update_last_success {
          if $::apt_update_last_success < $daily_threshold {
            $_kick_apt = true
          } else {
            $_kick_apt = false
          }
        } else {
          #if apt-get update has not successfully run, we should kick apt_update
          $_kick_apt = true
        }
      }
      'weekly':{
        #compare current date with the apt_update_last_success fact to determine
        #if we should kick apt_update.
        $weekly_threshold = (strftime('%s') - 604800)
        if $::apt_update_last_success {
          if ( $::apt_update_last_success < $weekly_threshold ) {
            $_kick_apt = true
          } else {
            $_kick_apt = false
          }
        } else {
          #if apt-get update has not successfully run, we should kick apt_update
          $_kick_apt = true
        }
      }
      default: {
        #catches 'recluctantly', and any other value (which should not occur).
        #do nothing.
        $_kick_apt = false
      }
    }
  } else {
    $_kick_apt = false
  }

  if $_kick_apt {
    $_refresh = false
  } else {
    $_refresh = true
  }
  exec { 'apt_update':
    command     => "${apt::params::provider} update",
    logoutput   => 'on_failure',
    refreshonly => $_refresh,
    timeout     => $apt::update_timeout,
    tries       => $apt::update_tries,
    try_sleep   => 1
  }
}