Source Code for Module rosgraph.rosenv

 1  # Software License Agreement (BSD License) 
 2  # 
 3  # Copyright (c) 2009, Willow Garage, Inc. 
 4  # All rights reserved. 
 5  # 
 6  # Redistribution and use in source and binary forms, with or without 
 7  # modification, are permitted provided that the following conditions 
 8  # are met: 
 9  # 
10  #  * Redistributions of source code must retain the above copyright 
11  #    notice, this list of conditions and the following disclaimer. 
12  #  * Redistributions in binary form must reproduce the above 
13  #    copyright notice, this list of conditions and the following 
14  #    disclaimer in the documentation and/or other materials provided 
15  #    with the distribution. 
16  #  * Neither the name of Willow Garage, Inc. nor the names of its 
17  #    contributors may be used to endorse or promote products derived 
18  #    from this software without specific prior written permission. 
19  # 
20  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
21  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
22  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
23  # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
24  # COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
25  # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
26  # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
27  # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
28  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
29  # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
30  # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
31  # POSSIBILITY OF SUCH DAMAGE. 
32   
33  import os 
34  import sys 
35   
36  ROS_MASTER_URI   = "ROS_MASTER_URI" 
37   
38  ROS_IP           ="ROS_IP" 
39  ROS_IPV6         ="ROS_IPV6" 
40  ROS_HOSTNAME     ="ROS_HOSTNAME" 
41  ROS_NAMESPACE    ="ROS_NAMESPACE" 
42   
43 -def get_master_uri(env=None, argv=None): 
44      """ 
45      Get the :envvar:`ROS_MASTER_URI` setting from the command-line args or 
46      environment, command-line args takes precedence. 
47   
48      :param env: override environment dictionary, ``dict`` 
49      :param argv: override ``sys.argv``, ``[str]`` 
50      :raises: :exc:`ValueError` If :envvar:`ROS_MASTER_URI` value is invalidly 
51        specified  
52      """     
53      if env is None: 
54          env = os.environ 
55      if argv is None: 
56          argv = sys.argv 
57      try: 
58          for arg in argv: 
59              if arg.startswith('__master:='): 
60                  val = None 
61                  try: 
62                      _, val = arg.split(':=') 
63                  except: 
64                      pass 
65                   
66                  # we ignore required here because there really is no 
67                  # correct return value as the configuration is bad 
68                  # rather than unspecified 
69                  if not val: 
70                      raise ValueError("__master remapping argument '%s' improperly specified"%arg) 
71                  return val 
72          return env[ROS_MASTER_URI] 
73      except KeyError as e: 
74          return None 
75