api/admin: add pool size and usage to admin.pool.Info response

QubesOS/qubes-issues#3240

qubes/api/admin.py

@@ -559,8 +559,19 @@ class QubesAdminAPI(qubes.api.AbstractQubesAPI):
 
         self.fire_event_for_permission(pool=pool)
 
+        size_info = ''
+        try:
+            size_info += 'size={}\n'.format(pool.size)
+        except NotImplementedError:
+            pass
+        try:
+            size_info += 'usage={}\n'.format(pool.usage)
+        except NotImplementedError:
+            pass
+
         return ''.join('{}={}\n'.format(prop, val)
-            for prop, val in sorted(pool.config.items()))
+            for prop, val in sorted(pool.config.items())) + \
+            size_info
 
     @qubes.api.method('admin.pool.Add',
         scope='global', write=True)

qubes/tests/api_admin.py

@@ -545,11 +545,29 @@ class TC_00_VMs(AdminAPITestCase):
     def test_150_pool_info(self):
         self.app.pools = {
             'pool1': unittest.mock.Mock(config={
-                'param1': 'value1', 'param2': 'value2'})
+                'param1': 'value1', 'param2': 'value2'},
+                usage=102400,
+                size=204800)
         }
         value = self.call_mgmt_func(b'admin.pool.Info', b'dom0', b'pool1')
 
-        self.assertEqual(value, 'param1=value1\nparam2=value2\n')
+        self.assertEqual(value,
+            'param1=value1\nparam2=value2\nsize=204800\nusage=102400\n')
+        self.assertFalse(self.app.save.called)
+
+    def test_151_pool_info_unsupported_size(self):
+        self.app.pools = {
+            'pool1': unittest.mock.Mock(config={
+                'param1': 'value1', 'param2': 'value2'})
+        }
+        type(self.app.pools['pool1']).size = unittest.mock.PropertyMock(
+            side_effect=NotImplementedError)
+        type(self.app.pools['pool1']).usage = unittest.mock.PropertyMock(
+            side_effect=NotImplementedError)
+        value = self.call_mgmt_func(b'admin.pool.Info', b'dom0', b'pool1')
+
+        self.assertEqual(value,
+            'param1=value1\nparam2=value2\n')
         self.assertFalse(self.app.save.called)
 
     @unittest.mock.patch('qubes.storage.pool_drivers')