aci format: change methods to staticmethods

formats/aci.py

@@ -26,7 +26,8 @@ class ACIImage(TarImageFormatter):
     for entry in layer_merger.get_generator():
       yield entry
 
-  def _build_isolators(self, docker_config):
+  @staticmethod
+  def _build_isolators(docker_config):
     """ Builds ACI isolator config from the docker config. """
 
     def _isolate_memory(memory):
@@ -70,7 +71,8 @@ class ACIImage(TarImageFormatter):
 
     return isolators
 
-  def _build_ports(self, docker_config):
+  @staticmethod
+  def _build_ports(docker_config):
     """ Builds the ports definitions for the ACI. """
     ports = []
 
@@ -100,7 +102,8 @@ class ACIImage(TarImageFormatter):
 
     return ports
 
-  def _build_volumes(self, docker_config):
+  @staticmethod
+  def _build_volumes(docker_config):
     """ Builds the volumes definitions for the ACI. """
     volumes = []
     names = set()
@@ -128,7 +131,8 @@ class ACIImage(TarImageFormatter):
     return volumes
 
 
-  def _build_manifest(self, namespace, repository, tag, docker_layer_data, synthetic_image_id):
+  @staticmethod
+  def _build_manifest(namespace, repository, tag, docker_layer_data, synthetic_image_id):
     """ Builds an ACI manifest from the docker layer data. """
 
     config = docker_layer_data.get('config', {})
@@ -174,9 +178,9 @@ class ACIImage(TarImageFormatter):
         "workingDirectory": config.get('WorkingDir', ''),
         "environment": [{"name": key, "value": value}
                         for (key, value) in [e.split('=') for e in config.get('Env')]],
-        "isolators": self._build_isolators(config),
-        "mountPoints": self._build_volumes(config),
-        "ports": self._build_ports(config),
+        "isolators": ACIImage._build_isolators(config),
+        "mountPoints": ACIImage._build_volumes(config),
+        "ports": ACIImage._build_ports(config),
         "annotations": [
           {"name": "created", "value": docker_layer_data.get('created', '')},
           {"name": "homepage", "value": source_url},
@@ -186,4 +190,3 @@ class ACIImage(TarImageFormatter):
     }
 
     return json.dumps(manifest)
-