diff --git a/fabfile.py b/fabfile.py
index 2d6bd51..5132a6b 100755
--- a/fabfile.py
+++ b/fabfile.py
@@ -1,16 +1,19 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+# Copyright (C) 2017, Maxim Lihachev, <envrm@yandex.ru>
 #
-# Script for updating service/application on remote server using Fabric.
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, version 3.
 #
-# (c) envrm
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
 #
-
-#Installing fabric:
-# apt-get install python-dev libffi-dev
-# pip install configparser
-# pip install fabric
+# You should have received a copy of the GNU General Public License along with
+# this program. If not, see <https://www.gnu.org/licenses/>.
 
 from __future__ import with_statement
 from fabric.api import *
@@ -24,19 +27,23 @@ import configparser
 
 from contextlib import contextmanager
 
-#-----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
 # Class for errors catching
 class FabricException(Exception):
-  pass
+    pass
 
-#-----------------------------------------------------------------------------
+# ----------------------------------------------------------------------------
 
-#Color highlighting of errors
+
+# Color highlighting of errors
 env.colorize_errors = True
-#Generating exceprions instead fails
-env.abort_exception=FabricException
 
-#-----------------------------------------------------------------------------
+# Generating exceprions instead fails
+env.abort_exception = FabricException
+
+
+# ----------------------------------------------------------------------------
 
 @contextmanager
 def if_needed():
@@ -46,6 +53,7 @@ def if_needed():
     except:
         pass
 
+
 def readConfig(config_file):
     '''Read config file'''
     global settings
@@ -54,25 +62,30 @@ def readConfig(config_file):
     settings.read(config_file)
     return settings
 
+
 @contextmanager
 def timestamp(*args):
     print '[' + current_time() + ']', args
     yield
 
+
 def opt(parameter):
     '''Get options'''
     setting = parameter.split(":")
     return settings.get(setting[0], setting[1])
 
+
 def background_run(command):
     '''Background execution of commands on remote servers'''
     subprocess.Popen(["nohup", command])
 
+
 def current_time():
     '''Current time in HH:MM:SS format'''
     return datetime.datetime.now().time().strftime('%X')
 
-#-----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
 
 @task
 def make_dist():
@@ -99,6 +112,7 @@ def diff_config():
     else:
         return True
 
+
 def copy_dirs(directories):
     '''Upload local directories to remote server'''
     for src_dir, dst_dir in ast.literal_eval(directories):
@@ -110,20 +124,22 @@ def copy_dirs(directories):
 
                 put(config_file, remote_file)
 
+
 @task
 def upload_dist():
     '''Upload distributive to remote server'''
     dist_dir = os.path.join(opt('product:app_path_dist'), date)
     run('mkdir -p %s' % dist_dir)
 
-    #Uploading archive
+    # Uploading archive
     with lcd(opt('release:app_path_dist')):
         put('*.zip', dist_dir)
 
-    #Extracting files
+    # Extracting files
     with cd(dist_dir):
         run('yes All | unzip *.zip')
 
+
 @task
 def copy_config():
     '''Copy configuration files'''
@@ -134,11 +150,13 @@ def copy_config():
 
     copy_dirs(opt('release:config_dirs'))
 
+
 @task
 def copy_custom_conf():
     '''Upload custom.conf to remote server'''
     put(opt('release:custom_conf_template'), opt('product:custom_conf_template'))
 
+
 @task
 def backup_files():
     '''Back up files'''
@@ -147,40 +165,47 @@ def backup_files():
         for to_backup in ast.literal_eval(opt('product:backup_files')):
             run('cp -rv %s ../backup/%s' % (os.path.join(opt('product:app_path_stand'), to_backup), date))
 
+
 @task
 def backup_db():
     '''Back up distributive'''
     with cd(opt('product:app_path_stand')):
         run("%s" % opt('product:backup_db_script'))
 
+
 @task
 def backup_db_copy():
     '''Backround upload of backup to remote server'''
     with cd(opt('product:app_path_stand')):
         background_run(opt('product:backup_db_copy_script'))
 
+
 @task
 def stop():
     '''Stop service'''
     run('kill $(cat %s)' % opt('product:app_pid_file'))
 
+
 def remove_libs():
     '''Remove previous version'''
     run('rm -rfv %s' % opt('product:app_path_libs'))
 
+
 @task
 def copy_libs():
     '''Copy libs'''
     with cd(opt('product:app_path_stand')):
         run('cp -rv %s %s' % (os.path.join(opt('product:app_path_dist'), date, '*/lib'), opt('product:app_path_libs')))
 
+
 @task
 def start():
     '''Start service'''
     with cd(opt('product:app_path_stand')):
         run("sh %s >> nohup.out 2>> nohup.out < /dev/null &" % opt('product:app_start_script'), pty=True)
 
-#-----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
 @task
 def update():
     '''Update service'''
@@ -196,21 +221,22 @@ def update():
     with timestamp("NEXT STEP"):
         pass
 
-    with if_needed(): stop()
+    with if_needed():
+        stop()
 
     remove_libs()
     copy_libs()
 
     start()
 
-#-----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
 
 settings = []
 
 readConfig('config.ini')
 
-#Remote host
+# Remote host
 env.host_string = opt('product:host')
 
 date = datetime.datetime.now().strftime("%Y-%m-%d")
-