#!/usr/bin/ruby

# SYNOPSIS
#   Rolls over old logs of applications on Rails Machine.
#   This script is intended to be called by cron on your Rails Machine.
#
# VERSION
#   0.2
#
# HISTORY
#   0.2
#     - improved log file selection with glob (credit to Bill Siggelkow)
#   0.1
#     - first release
#
# AUTHOR
#   Andrew Stewart, AirBlade Software Ltd (boss at airbladesoftware dot com)
# 
# FEEDBACK
#   Yes please!

require 'rubygems'
require 'logger'
require 'yaml'

# Configure the script here.  You won't need to change anything
# unless you have modified your Rails Machine setup.
APPS_PATH   = '/var/www/apps'             # Path to all your apps
EXCLUSIONS  = %w( rails )                 # Any directories or apps to exclude
SIZE        = 5 * 1024 * 1024             # Max size of a log file (bytes)
TIMESTAMP   = '%Y%m%d%H%M%S'              # Timestamp for databases' backup files
LOG_FILE    = '/home/deploy/logs.log'     # Where to log activity

# The body of the script follows.

log = Logger.new(LOG_FILE, 5, 10*1024)
log.level = Logger::DEBUG

log.info 'Starting log maintenance'
Dir["#{APPS_PATH}/*"].each do |entry|
  app = File.basename entry
  next if File.file?(entry) || EXCLUSIONS.include?(app)

  Dir["#{File.join(entry, 'current', 'log')}/*.log"].each do |log_file|
    if File.size(log_file) > SIZE
      copy_cmd =  "cp #{log_file} #{log_file}-#{Time.now.strftime(TIMESTAMP)}"
      log.debug "Executing: #{copy_cmd}"
      `#{copy_cmd}`
      log.debug "Truncating #{log_file}"
      File.truncate log_file, 0
    end
  end
  log.info "Rolled over logs for #{app}"
end
log.info 'Finished log maintenance'