From 4ed3735cda0672b73772cb38d785193744ed72aa Mon Sep 17 00:00:00 2001
From: Hannes Ljungberg <hannes@5monkeys.se>
Date: Tue, 19 Mar 2019 06:39:17 +0100
Subject: [PATCH] docker_swarm_service: Support resolving images from private
 registries  (#53997)

* Override inspect_distribution to fetch digest

* Formatting fix

* Use single quote strings
---
 lib/ansible/module_utils/docker/common.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/ansible/module_utils/docker/common.py b/lib/ansible/module_utils/docker/common.py
index 2af7433b04..6056bc68f7 100644
--- a/lib/ansible/module_utils/docker/common.py
+++ b/lib/ansible/module_utils/docker/common.py
@@ -689,6 +689,21 @@ class AnsibleDockerClient(Client):
         elif isinstance(result, string_types) and result:
             self.module.warn('Docker warning: {0}'.format(result))
 
+    def inspect_distribution(self, image):
+        '''
+        Get image digest by directly calling the Docker API when running Docker SDK < 4.0.0
+        since prior versions did not support accessing private repositories.
+        '''
+        if self.docker_py_version < LooseVersion('4.0.0'):
+            registry = auth.resolve_repository_name(image)[0]
+            header = auth.get_config_header(self, registry)
+            if header:
+                return self._result(self._get(
+                    self._url('/distribution/{0}/json', image),
+                    headers={'X-Registry-Auth': header}
+                ), json=True)
+        return super(AnsibleDockerClient, self).inspect_distribution(image)
+
 
 def compare_dict_allow_more_present(av, bv):
     '''