Make the app config more powerful in terms of injecting fake dependencies. Refactor the tests to use metaclasses and to actually all run.

storage/basestorage.py

@@ -0,0 +1,78 @@
+class Storage(object):
+
+  """Storage is organized as follow:
+  $ROOT/images/<image_id>/json
+  $ROOT/images/<image_id>/layer
+  $ROOT/repositories/<namespace>/<repository_name>/<tag_name>
+  """
+
+  # Useful if we want to change those locations later without rewriting
+  # the code which uses Storage
+  repositories = 'repositories'
+  images = 'images'
+  # Set the IO buffer to 64kB
+  buffer_size = 64 * 1024
+
+  #FIXME(samalba): Move all path resolver in each module (out of the base)
+  def images_list_path(self, namespace, repository):
+    return '{0}/{1}/{2}/_images_list'.format(self.repositories,
+                                             namespace,
+                                             repository)
+
+  def image_json_path(self, namespace, repository, image_id):
+    return '{0}/{1}/{2}/{3}/json'.format(self.images, namespace,
+                                         repository, image_id)
+
+  def image_mark_path(self, namespace, repository, image_id):
+    return '{0}/{1}/{2}/{3}/_inprogress'.format(self.images, namespace,
+                                                repository, image_id)
+
+  def image_checksum_path(self, namespace, repository, image_id):
+    return '{0}/{1}/{2}/{3}/_checksum'.format(self.images, namespace,
+                                              repository, image_id)
+
+  def image_layer_path(self, namespace, repository, image_id):
+    return '{0}/{1}/{2}/{3}/layer'.format(self.images, namespace,
+                                          repository, image_id)
+
+  def image_ancestry_path(self, namespace, repository, image_id):
+    return '{0}/{1}/{2}/{3}/ancestry'.format(self.images, namespace,
+                                             repository, image_id)
+
+  def repository_namespace_path(self, namespace, repository):
+    return '{0}/{1}/{2}/'.format(self.images, namespace, repository)
+
+  def image_file_trie_path(self, namespace, repository, image_id):
+    return '{0}/{1}/{2}/{3}/files.trie'.format(self.images, namespace,
+                                               repository, image_id)
+
+  def image_file_diffs_path(self, namespace, repository, image_id):
+    return '{0}/{1}/{2}/{3}/diffs.json'.format(self.images, namespace,
+                                               repository, image_id)
+
+  def get_content(self, path):
+    raise NotImplementedError
+
+  def put_content(self, path, content):
+    raise NotImplementedError
+
+  def stream_read(self, path):
+    raise NotImplementedError
+
+  def stream_read_file(self, path):
+    raise NotImplementedError
+
+  def stream_write(self, path, fp):
+    raise NotImplementedError
+
+  def list_directory(self, path=None):
+    raise NotImplementedError
+
+  def exists(self, path):
+    raise NotImplementedError
+
+  def remove(self, path):
+    raise NotImplementedError
+
+  def get_size(self, path):
+    raise NotImplementedError