[usb_gadget p08] Package the USB gadget framework for easy distribution.

tools/usb_gadget/server.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """WSGI application to manage a USB gadget.
 """
 
+import re
+import sys
+
 from tornado import httpserver
 from tornado import web
 
 import default_gadget
 
+VERSION_PATTERN = re.compile(r'.*usb_gadget-([a-z0-9]{32})\.zip')
+
 address = None
 chip = None
 claimed_by = None
 default = default_gadget.DefaultGadget()
 gadget = None
 
 
 def SwitchGadget(new_gadget):
   if chip.IsConfigured():
     chip.Destroy()
 
   global gadget
   gadget = new_gadget
   gadget.AddStringDescriptor(3, address)
   chip.Create(gadget)
 
 
+class VersionHandler(web.RequestHandler):
+
+  def get(self):
+    version = 'unpackaged'
+    for path in sys.path:
+      match = VERSION_PATTERN.match(path)
+      if match:
+        version = match.group(1)
+        break
+
+    self.write(version)
+
+
 class ClaimHandler(web.RequestHandler):
 
   def post(self):
     global claimed_by
 
     if claimed_by is None:
       claimed_by = self.get_argument('session_id')
     else:
       self.write('Device is already claimed by "{}".'.format(claimed_by))
       self.set_status(403)
@@ skipping 22 matching lines @@
 
 
 class ReconnectHandler(web.RequestHandler):
 
   def post(self):
     if not chip.IsConfigured():
       chip.Create(gadget)
 
 
 app = web.Application([
+    (r'/version', VersionHandler),
     (r'/claim', ClaimHandler),
     (r'/unclaim', UnclaimHandler),
     (r'/unconfigure', UnconfigureHandler),
     (r'/disconnect', DisconnectHandler),
     (r'/reconnect', ReconnectHandler),
 ])
 
 http_server = httpserver.HTTPServer(app)