Added support for user namespace.

Signed-off-by: Srikalyan Swayampakula <srikalyansswayam@gmail.com>

docker/utils/utils.py

@@ -620,7 +620,7 @@ def create_host_config(binds=None, port_bindings=None, lxc_conf=None,
                        device_write_bps=None, device_read_iops=None,
                        device_write_iops=None, oom_kill_disable=False,
                        shm_size=None, version=None, tmpfs=None,
-                       oom_score_adj=None):
+                       oom_score_adj=None, userns_mode=None):
 
     host_config = {}
 
@@ -853,6 +853,14 @@ def create_host_config(binds=None, port_bindings=None, lxc_conf=None,
             raise host_config_version_error('tmpfs', '1.22')
         host_config["Tmpfs"] = convert_tmpfs_mounts(tmpfs)
 
+    if userns_mode:
+        if version_lt(version, '1.23'):
+            raise host_config_version_error('userns_mode', '1.23')
+
+        if userns_mode != "host":
+            raise host_config_value_error("userns_mode", userns_mode)
+        host_config['UsernsMode'] = userns_mode
+
     return host_config
 
 

docs/hostconfig.md

@@ -123,6 +123,8 @@ for example:
   for more information.
 * tmpfs: Temporary filesystems to mouunt. See [Using tmpfs](tmpfs.md) for more
   information.
+* userns_mode: Sets the user namespace mode for the container when user namespace remapping option
+  is enabled. supported values are: host
 
 **Returns** (dict) HostConfig dictionary
 

tests/unit/utils_test.py

@@ -98,6 +98,16 @@ class HostConfigTest(base.BaseTestCase):
             InvalidVersion, lambda: create_host_config(version='1.18.3',
                                                        oom_kill_disable=True))
 
+    def test_create_host_config_with_userns_mode(self):
+        config = create_host_config(version='1.23', userns_mode='host')
+        self.assertEqual(config.get('UsernsMode'), 'host')
+        self.assertRaises(
+            InvalidVersion, lambda: create_host_config(version='1.22',
+                                                       userns_mode='host'))
+        self.assertRaises(
+            ValueError, lambda: create_host_config(version='1.23',
+                                                   userns_mode='host12'))
+
     def test_create_host_config_with_oom_score_adj(self):
         config = create_host_config(version='1.22', oom_score_adj=100)
         self.assertEqual(config.get('OomScoreAdj'), 100)
@@ -602,7 +612,6 @@ class UtilsTest(base.BaseTestCase):
 
 
 class SplitCommandTest(base.BaseTestCase):
-
     def test_split_command_with_unicode(self):
         self.assertEqual(split_command(u'echo μμ'), ['echo', 'μμ'])