update requirements on startup

agent.py

 #!/usr/bin/env python
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # -*- coding: utf-8 -*-
 
 
+from os import mkdir, environ, chdir
+import subprocess
+import sys
+
+chdir(sys.path[0])
+subprocess.call(('pip', 'install', '-r', 'requirements.txt'))
+
+
 from twisted.internet import reactor, defer
 from twisted.internet import reactor, defer
 from twisted.internet.task import LoopingCall
 from twisted.internet.task import LoopingCall
 from twisted.internet.serialport import SerialPort
 from twisted.internet.serialport import SerialPort
 
 
 import uptime
 import uptime
 import logging
 import logging
-import subprocess
 import fileinput
 import fileinput
 import platform
 import platform
-import sys
 import tarfile
 import tarfile
 from os.path import expanduser, join, exists
 from os.path import expanduser, join, exists
-from os import mkdir, environ, chdir
 from glob import glob
 from glob import glob
 from inspect import getargspec, isfunction
 from inspect import getargspec, isfunction
 from StringIO import StringIO
 from StringIO import StringIO
@@ -268,8 +273,6 @@ class Context(object):
             rmtree(old_dir, ignore_errors=True)
             rmtree(old_dir, ignore_errors=True)
             move(cur_dir, old_dir)
             move(cur_dir, old_dir)
             move(new_dir, cur_dir)
             move(new_dir, cur_dir)
-            chdir(cur_dir)
-            subprocess.call(('pip', 'install', '-r', 'requirements.txt'))
             logger.info('Updated')
             logger.info('Updated')
             reactor.stop()
             reactor.stop()