Add df method

Signed-off-by: Joffrey F <joffrey@docker.com>

docker/api/daemon.py

@@ -7,6 +7,22 @@ from ..constants import INSECURE_REGISTRY_DEPRECATION_WARNING
 
 
 class DaemonApiMixin(object):
+    @utils.minimum_version('1.25')
+    def df(self):
+        """
+        Get data usage information.
+
+        Returns:
+            (dict): A dictionary representing different resource categories
+            and their respective data usage.
+
+        Raises:
+            :py:class:`docker.errors.APIError`
+                If the server returns an error.
+        """
+        url = self._url('/system/df')
+        return self._result(self._get(url), True)
+
     def events(self, since=None, until=None, filters=None, decode=None):
         """
         Get real-time events from the server. Similar to the ``docker events``

docker/client.py

@@ -155,6 +155,10 @@ class DockerClient(object):
         return self.api.events(*args, **kwargs)
     events.__doc__ = APIClient.events.__doc__
 
+    def df(self):
+        return self.api.df()
+    df.__doc__ = APIClient.df.__doc__
+
     def info(self, *args, **kwargs):
         return self.api.info(*args, **kwargs)
     info.__doc__ = APIClient.info.__doc__

docs/client.rst

@@ -25,6 +25,7 @@ Client reference
   .. autoattribute:: swarm
   .. autoattribute:: volumes
 
+  .. automethod:: df()
   .. automethod:: events()
   .. automethod:: info()
   .. automethod:: login()

tests/integration/client_test.py

@@ -2,21 +2,28 @@ import unittest
 
 import docker
 
+from ..helpers import requires_api_version
 from .base import TEST_API_VERSION
 
 
 class ClientTest(unittest.TestCase):
+    client = docker.from_env(version=TEST_API_VERSION)
 
     def test_info(self):
-        client = docker.from_env(version=TEST_API_VERSION)
-        info = client.info()
+        info = self.client.info()
         assert 'ID' in info
         assert 'Name' in info
 
     def test_ping(self):
-        client = docker.from_env(version=TEST_API_VERSION)
-        assert client.ping() is True
+        assert self.client.ping() is True
 
     def test_version(self):
-        client = docker.from_env(version=TEST_API_VERSION)
-        assert 'Version' in client.version()
+        assert 'Version' in self.client.version()
+
+    @requires_api_version('1.25')
+    def test_df(self):
+        data = self.client.df()
+        assert 'LayersSize' in data
+        assert 'Containers' in data
+        assert 'Volumes' in data
+        assert 'Images' in data