feat: add support for merge_base API

1 files changed, 27 insertions, 1 deletions

diff --git a/gitlab/v4/objects/repositories.py b/gitlab/v4/objects/repositories.py
index b340e80..9c0cd9a 100644
--- a/gitlab/v4/objects/repositories.py
+++ b/gitlab/v4/objects/repositories.py
@@ -10,7 +10,7 @@ import requests
 import gitlab
 from gitlab import cli
 from gitlab import exceptions as exc
-from gitlab import utils
+from gitlab import types, utils
 
 if TYPE_CHECKING:
     # When running mypy we use these as the base classes
@@ -246,6 +246,32 @@ class RepositoryMixin(_RestObjectBase):
             result, streamed, action, chunk_size, iterator=iterator
         )
 
+    @cli.register_custom_action("Project", ("refs",))
+    @exc.on_http_error(exc.GitlabGetError)
+    def repository_merge_base(
+        self, refs: List[str], **kwargs: Any
+    ) -> Union[Dict[str, Any], requests.Response]:
+        """Return a diff between two branches/commits.
+
+        Args:
+            refs: The refs to find the common ancestor of. Multiple refs can be passed.
+            **kwargs: Extra options to send to the server (e.g. sudo)
+
+        Raises:
+            GitlabAuthenticationError: If authentication is not correct
+            GitlabGetError: If the server failed to perform the request
+
+        Returns:
+            The common ancestor commit (*not* a RESTObject)
+        """
+        path = f"/projects/{self.encoded_id}/repository/merge_base"
+        query_data, _ = utils._transform_types(
+            data={"refs": refs},
+            custom_types={"refs": types.ArrayAttribute},
+            transform_data=True,
+        )
+        return self.manager.gitlab.http_get(path, query_data=query_data, **kwargs)
+
     @cli.register_custom_action("Project")
     @exc.on_http_error(exc.GitlabDeleteError)
     def delete_merged_branches(self, **kwargs: Any) -> None: