Fix: runtime error #17 (comment)

Signed-off-by: Isaac Saito <[email protected]>

setup.py

@@ -13,7 +13,7 @@
 name_package_lib = "docker_vcs_lib"
 
 setup(
-    version="0.1.10",    
+    version="0.1.12",    
     author="Isaac Saito",
     author_email="[email protected]",
     classifiers=[
@@ -25,7 +25,7 @@
     ],
     entry_points={
         'console_scripts': [
-            'docker_vcs = docker_vcs_lib.docker_vcs:main'
+            'docker_vcs = docker_vcs_lib.docker_vcs:__main__'
         ],
     },    
     description="A Python package that provides convenience utility for Docker, vcstool (another tool that provides utility for VCS), as well as rosdep.",

src/docker_vcs_lib/docker_builder_vcs.py

@@ -13,6 +13,7 @@
 import json
 import logging
 import os
+from requests.exceptions import ConnectionError
 import pathlib
 import sh
 import shlex
@@ -42,8 +43,14 @@ class DockerBuilderVCS():
     def __init__(self):
         try:
             self._docker_client = docker.from_env()
-        except (docker.errors.APIError, docker.errors.TLSParameterError) as e:
-            logging.error(str(e))
+        except (docker.errors.DockerException, docker.errors.APIError, docker.errors.TLSParameterError, ConnectionError) as e:
+            # Message hinted from https://github.com/osrf/rocker/pull/215
+            msg = ("Docker Client failed to connect to docker daemon."
+                   " Please verify that docker is installed and running."
+                   " As well as that you have permission to access the docker daemon."
+                   " This is usually by being a member of the docker group."
+                   " The underlying error was:\n{}".format(str(e)))
+            logging.error(msg)
             exit(1)
         pass