fix(client): use parse_repository_tag function

Source: https://github.com/docker/docker-py/blob/be73aaf5401faf5ca64911fb6664036c7b7ec61b/docker/utils/utils.py#L188-L197

Author: Matthew Fisher

client/deis.py

@@ -296,6 +296,22 @@ def encode(obj):
         return obj
 
 
+def parse_repository_tag(repo):
+    """Parses a given docker image and splits the tag from the repository.
+
+    See github.com/docker/docker-py#be73aaf, lines 188-197
+    """
+    column_index = repo.rfind(':')
+    if column_index < 0:
+        return repo, None
+    tag = repo[column_index + 1:]
+    slash_index = tag.find('/')
+    if slash_index < 0:
+        return repo[:column_index], tag
+
+    return repo, None
+
+
 def readable_datetime(datetime_str):
     """
     Return a human-readable datetime string from an ECMA-262 (JavaScript)
@@ -968,7 +984,8 @@ def builds_create(self, args):
           -p --procfile=<procfile>
             A YAML string used to supply a Procfile to the application.
         """
-        if ':' not in args['<image>']:
+        _, tag = parse_repository_tag(args['<image>'])
+        if tag is None:
             self._logger.error('<image> must contain a tag')
             sys.exit(1)
         app = args.get('--app')