devserver: allow calling devserver from anywhere

devserver_test.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Regression tests for devserver."""
 
 import os
 import signal
@@ skipping 31 matching lines @@
    track="developer-build"
    board="x86-generic">
 <o:ping active="0"></o:ping>
 <o:updatecheck></o:updatecheck>
 </o:app>
 </o:gupdate>
 """
 # TODO(girts): use a random available port.
 UPDATE_URL = 'http://127.0.0.1:8080/update'
 
+# Run all tests while being in /
+base_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
+os.chdir("/")
 
 class DevserverTest(unittest.TestCase):
   """Regressions tests for devserver."""
 
   def setUp(self):
     """Copies in testing files."""
-    base_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
 
     # Copy in developer-test.gz, as "static/" directory is hardcoded, and it
     # would be very hard to change it (static file serving is handled deep
     # inside webpy).
     image_src = os.path.join(base_dir, TEST_IMAGE)
     self.image = os.path.join(base_dir, STATIC_DIR, 'developer-test.gz')
     if os.path.exists(self.image):
       os.unlink(self.image)
     shutil.copy(image_src, self.image)
 
     self.factory_config = os.path.join(base_dir, TEST_FACTORY_CONFIG)
 
   def tearDown(self):
     """Removes testing files."""
     if os.path.exists(self.image):
       os.unlink(self.image)
 
   def testValidateFactoryConfig(self):
     """Tests --validate_factory_config."""
     cmd = [
         'python',
-        'devserver.py',
+        os.path.join(base_dir, 'devserver.py'),
         '--validate_factory_config',
         '--factory_config', self.factory_config,
     ]
     process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
     stdout, _ = process.communicate()
     self.assertEqual(0, process.returncode)
     self.assertTrue('Config file looks good.' in stdout)
 
   def _StartServer(self):
     """Starts devserver, returns process."""
     cmd = [
         'python',
+        os.path.join(base_dir, 'devserver.py'),
         'devserver.py',
         '--factory_config', self.factory_config,
     ]
     process = subprocess.Popen(cmd)
     return process.pid
 
   def testHandleUpdate(self):
     """Tests running the server and getting an update."""
     pid = self._StartServer()
     try:
@@ skipping 18 matching lines @@
       # Try to fetch the image.
       connection = urllib2.urlopen(codebase)
       contents = connection.read()
       self.assertEqual('Developers, developers, developers!\n', contents)
     finally:
       os.kill(pid, signal.SIGKILL)
 
 
 if __name__ == '__main__':
   unittest.main()