init file for running rails apps as a service (in screen) - redmine is example

gistfile1.rb

#!/usr/bin/ruby

app_name="redmine"
pid_file="/var/run/#{app_name}.pid"
user="redmine"
appdir="/home/#{user}/redmine"
LOAD_RVM="source /home/#{user}/.rvm/scripts/rvm"
START_APP="RAILS_ENV=production passenger start -a 127.0.0.1 -p 3002"
STOP_APP="RAILS_ENV=production passenger stop -a 127.0.0.1 -p 3002"

def start
    
  if File.exists pid_file
    pid=File.read(pid_file).chomp
    puts "#{app_name} already running on pid #{pid}"
    puts "If it is not, delete #{pid_file} and try to start again"
    exit
  end
    
  pid = fork do
    File.chdir appdir
    system "su #{user} -c \"#{LOAD_RVM} && #{START_APP}\" 2>&1 > /dev/null"
    exit
  end

  Process.detach pid

  File.open(pid_file, "w") do |f|
    f.write pid
  end
end

def stop
    
  if File.exists pid_file
  
    pid=File.read(pid_file).chomp
    File.chdir appdir
    system "su #{user} -c \"#{LOAD_RVM} && #{STOP_APP}\" 2>&1 > /dev/null"
    Process.kill pid
    puts "#{app_name} stopped"
    File.delete pid_file
  else
    
    puts "#{app_name} is not running"
  end
end

def status
    
  if File.exists pid_file
    pid=File.read(pid_file).chomp
    puts "#{app_name} running on pid #{pid}"
  else
    puts "#{app_name} not running"
  end
end

case ARGV[0]
  when "start"
    start
  when "stop"
    stop
  when "restart"
    stop
    start
  when "status"
    status
  default
    puts "Usage: /etc/init.d/#{app_name} {start|stop|restart|status}"
    exit
end