gistfile1.rb

#!/usr/bin/env ruby

# Rotate rails logs with more flexibility than system logrotate
# requires logrotate gem and written for use with passenger
# can easily be adapted to mongrel

require 'fileutils'
require 'rubygems'
require 'logrotate'

RAILS_SITES = [
  '/path/to/rails_root'
]

LOGROTATE_OPTIONS = {
  :count => 2,
  :gzip => true
}

def logs_for(rails_root)
  Dir.glob(File.join(rails_root, 'log', '*.log'))
end

def should_rotate?(logfile)
  # Rotate if size > 50M, or add other checks here
  (File.size(logfile) / 1048576).round >= 50
end

def restart_rails(rails_root)
  FileUtils.touch File.join(rails_root, 'tmp', 'restart.txt')
end

for site in RAILS_SITES
  restart_needed = false

  unless File.exist?(site)
    $stderr.puts "Rails site #{site} does not exist or bad permissions, skipping"
    next
  end

  logs = logs_for(site)
  logs.each do |log|
    if should_rotate?(log)
      LogRotate.rotate_file(log, LOGROTATE_OPTIONS)
      restart_needed = true
    end
  end

  restart_rails(site) if restart_needed
end