#!/bin/sh

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This script should be called daily to clean up log files.

CLEANUP_PAUSED_FILE="/var/lib/cleanup_logs_paused"
NUM_DAYS_TO_PRESERVE=7

remove_old_dated_files() {
  find "$1" -name "$2" -mtime +${NUM_DAYS_TO_PRESERVE} -exec rm '{}' ';'
}

rotate_file() {
  local file="$1"
  if [ ! -f "${file}" ]; then
    # Avoid creating an empty file if it does not exist to begin with
    return
  fi
  echo Rotating "${file}"
  for i in $(seq ${NUM_DAYS_TO_PRESERVE} -1 2); do
    mv -f "${file}.$((i - 1))" "${file}.$i"
  done
  mv -f "${file}" "${file}.1"
  touch "${file}"
}

rotate_logs() {
  echo Rotating rsyslogd logs
  for x in messages secure faillog; do
    rotate_file "/var/log/${x}"
  done
  sudo pkill -HUP rsyslogd
}

if [ -r "${CLEANUP_PAUSED_FILE}" ]; then
  echo "Exiting early because ${CLEANUP_PAUSED_FILE} exists."
  exit 1
fi

# Remove old window manager logs (not logged in)
remove_old_dated_files /var/log/window_manager chromeos-wm.*-*

# Remove old window manager logs (logged in)
remove_old_dated_files /home/chronos/user/log chromeos-wm.*-*

# Remove old screen locker logs
remove_old_dated_files /home/chronos/user/log screen-locker.*-*

# Remove old miscellaneous UI logs
remove_old_dated_files /var/log/ui ui.*-*

# Remove old update engine logs
remove_old_dated_files /var/log/update_engine update_engine.*-*

# Remove old power manager logs
remove_old_dated_files /var/log/power_manager power*

# Rotate other logs
rotate_logs