catch docker api exceptions

Dockerfile

@@ -7,6 +7,7 @@ LABEL maintainer="Robert Kaussow <mail@geeklabor.de>" \
     org.label-schema.schema-version="1.0"
 
 ENV PY_COLORS=1
+ENV TZ=UTC
 
 ADD dist/docker_tidy-*.whl /
 

dockertidy/GarbageCollector.py

@@ -295,7 +295,10 @@ class GarbageCollector:
 
     def _get_docker_client(self):
         config = self.config.config
-        return docker.APIClient(version="auto", timeout=config["http_timeout"])
+        try:
+            return docker.APIClient(version="auto", timeout=config["http_timeout"])
+        except docker.errors.DockerException as e:
+            self.log.sysexit_with_message("Can't create docker client\n{}".format(e))
 
     def run(self):
         """Garbage collector main method."""

dockertidy/tests/unit/test_garbagecollector.py

@@ -447,3 +447,7 @@ def test_build_exclude_set_empty(gc):
     gc.config.config["gc"]["exclude_images"] = []
     exclude_set = gc._build_exclude_set()
     assert exclude_set == set()
+
+
+def test_get_docker_client(gc, mocker):
+    assert isinstance(gc.docker, docker.APIClient)