Reduce complexity of _get_container_create_options

Signed-off-by: Daniel Nephin <[email protected]>

compose/service.py

@@ -566,8 +566,7 @@ class Service(object):
         elif not container_options.get('name'):
             container_options['name'] = self.get_container_name(number, one_off)
 
-        if 'detach' not in container_options:
-            container_options['detach'] = True
+        container_options.setdefault('detach', True)
 
         # If a qualified hostname was given, split it into an
         # unqualified hostname and a domainname unless domainname
@@ -581,16 +580,9 @@ class Service(object):
             container_options['domainname'] = parts[2]
 
         if 'ports' in container_options or 'expose' in self.options:
-            ports = []
-            all_ports = container_options.get('ports', []) + self.options.get('expose', [])
-            for port_range in all_ports:
-                internal_range, _ = split_port(port_range)
-                for port in internal_range:
-                    port = str(port)
-                    if '/' in port:
-                        port = tuple(port.split('/'))
-                    ports.append(port)
-            container_options['ports'] = ports
+            container_options['ports'] = build_container_ports(
+                container_options,
+                self.options)
 
         container_options['environment'] = merge_environment(
             self.options.get('environment'),
@@ -1031,3 +1023,18 @@ def format_environment(environment):
             return key
         return '{key}={value}'.format(key=key, value=value)
     return [format_env(*item) for item in environment.items()]
+
+# Ports
+
+
+def build_container_ports(container_options, options):
+    ports = []
+    all_ports = container_options.get('ports', []) + options.get('expose', [])
+    for port_range in all_ports:
+        internal_range, _ = split_port(port_range)
+        for port in internal_range:
+            port = str(port)
+            if '/' in port:
+                port = tuple(port.split('/'))
+            ports.append(port)
+    return ports