Add support for user on exec_create.

1 files changed, 9 insertions, 2 deletions

diff --git a/docker/client.py b/docker/client.py
index 998ebac..274359b 100644
--- a/docker/client.py
+++ b/docker/client.py
@@ -521,19 +521,26 @@ class Client(requests.Session):
         return self.exec_start(create_res, detach, tty, stream)
 
     def exec_create(self, container, cmd, stdout=True, stderr=True, tty=False,
-                    privileged=False):
+                    user=None, privileged=False):
         if utils.compare_version('1.15', self._version) < 0:
             raise errors.InvalidVersion('Exec is not supported in API < 1.15')
         if privileged and utils.compare_version('1.19', self._version) < 0:
             raise errors.InvalidVersion(
                 'Privileged exec is not supported in API < 1.19'
             )
+        if user and utils.compare_version('1.19', self._version) < 0:
+            raise errors.InvalidVersion(
+                'User-specific exec is not supported in API < 1.19'
+            )
         if isinstance(cmd, six.string_types):
             cmd = shlex.split(str(cmd))
 
+        if user is None:
+            user = ''
+
         data = {
             'Container': container,
-            'User': '',
+            'User': user,
             'Privileged': privileged,
             'Tty': tty,
             'AttachStdin': False,