Add env.

am_i_up/am_i_up.py

@@ -22,7 +22,8 @@ def main():
         web.get('/', routes.root),
         web.get('/ping', routes.ping),
         web.get('/uptime', routes.uptime),
-        web.get('/build_info', routes.build_info)
+        web.get('/build_info', routes.build_info),
+        web.get('/env', routes.env)
     ])
     web.run_app(app)
 
@@ -33,12 +34,27 @@ class Facts:
     def get_uptime(self):
         return time.monotonic() - self._start_time
 
+    def get_env(self):
+        env = {}
+        # We're not going to return the whole environment because
+        # of security.
+        # Let's pick the ones we want.
+        env['ROS_AUTOMATIC_DISCOVERY_RANGE'] = os.environ.get('ROS_AUTOMATIC_DISCOVERY_RANGE', None)
+        env['AMENT_PREFIX_PATH'] = os.environ.get('AMENT_PREFIX_PATH', None)
+        env['ROS_DISTRO'] = os.environ.get('ROS_DISTRO', None)
+        env['RMW_IMPLEMENTATION'] = os.environ.get('RMW_IMPLEMENTATION', None)
+        env['ROS_NAMESPACE'] = os.environ.get('ROS_NAMESPACE', None)
+        env['CYCLONEDDS_URI'] = os.environ.get('CYCLONEDDS_URI', None)
+
+        return env
+
     def get_buildinfo(self):
         # Find the share directory for 'build_info_getter'.
         build_info_getter_directory = None
         try:
             build_info_getter_directory = get_package_share_directory('build_info_getter')
-        except:
+        except Exception as e:
+            print("Can't find build info.\n{}".format(e))
             return None
         # Find and read the project_state.repos file in it.
         project_state_file = build_info_getter_directory + "/project_state.repos"
@@ -46,11 +62,10 @@ class Facts:
         try:
             with open(project_state_file, 'r') as file_obj:
                 project_state_content = yaml.safe_load(file_obj)
-        except:
+        except Exception as e:
             # We either didn't load the file or couldn't read it
             # as json.
-            # If we ignore the error, we'll respond with a None which is the right thing.
-            pass
+            print("Can't find build info.\n{}".format(e))
         return project_state_content
 
 class Routes:
@@ -77,5 +92,6 @@ class Routes:
         project_state["status"] = True
         return web.json_response(project_state)
 
-
-
+    async def env(self, request):
+        env = self._facts.get_env()
+        return web.json_response(env)