#!/bin/bash
#
# dmeventd uses a lot of memory reading large locale data.
# Since we don't need this extra language support anyways,
# just remove extra locales. Works around bug that is fixed
# in newer version of device-mapper.
#
# https://bugzilla.redhat.com/show_bug.cgi?id=541911

prune_locales() {
  # Phase 1
  localedef --list-archive | grep -v -i -E 'en_GB.utf8|en_US.utf8' | xargs localedef --delete-from-archive
  result=$?
  if [[ "$result" -ne "0" ]]; then
    error=1
  fi  

  # Phase 2
  phase_2=$(ls /usr/share/locale/| grep -v -i -E 'en_GB|en_US|en|locale.alias')
  for extra_locale in ${phase_2} 
  do
    rm -rf /usr/share/locale/$extra_locale
    result=$?
    if [[ "$result" -ne "0" ]]; then
      error=1
    fi
  done

  # Phase 3
  phase_3=$(ls /usr/lib/locale/| grep -v -i -E 'en_GB|en_US|en')
  for extra_locale in ${phase_3}
  do
    rm -rf /usr/lib/locale/$extra_locale
    result=$?
    if [[ "$result" -ne "0" ]]; then
      error=1
    fi
  done
}

rest_dmeventd() {
  killall -9 dmeventd
  # Give it time to close so start attempt doesnt think its already running and fail.
  sleep 4
  /sbin/dmeventd
}

backup_locales() {
  cp -Rp /usr/lib/locale /usr/lib/locale.lwOrig
  cp -Rp /usr/share/locale /usr/share/locale.lwOrig
  result=$?
  if [[ "$result" -ne "0" ]]; then
    error=1
  fi
}

rebuild_locales() {
  /usr/sbin/build-locale-archive
  result=$?
  if [[ "$result" -ne "0" ]]; then
    error=1
  fi
}

if_error() {
  if [[ "$error" -eq "1" ]]; then
    echo "Exit status of at least one of the system commands indicates an error. Review scroll back for possible error."
  else 
    rest_dmeventd
    echo "Finished pruning non EN locales (and backing up old ones). 'localedef --list-archive' should only be showing EN based locales now.
Originals at:
/usr/lib/locale.lwOrig
/usr/share/locale.lwOrig"
  fi
}

backup_locales
prune_locales
rebuild_locales
if_error