Fix creating empty commit on PR (#2413)

* Fix creating empty commit on PR

* unquoted revision for fetching files to copy as well

src/huggingface_hub/hf_api.py

@@ -3801,7 +3801,7 @@ def create_commit(
 
             # Get latest commit info
             try:
-                info = self.repo_info(repo_id=repo_id, repo_type=repo_type, revision=revision, token=token)
+                info = self.repo_info(repo_id=repo_id, repo_type=repo_type, revision=unquoted_revision, token=token)
             except RepositoryNotFoundError as e:
                 e.append_to_message(_CREATE_COMMIT_NO_REPO_ERROR_MESSAGE)
                 raise
@@ -3822,7 +3822,7 @@ def create_commit(
             repo_type=repo_type,
             repo_id=repo_id,
             headers=headers,
-            revision=revision,
+            revision=unquoted_revision,
             endpoint=self.endpoint,
         )
         commit_payload = _prepare_commit_payload(

tests/test_hf_api.py

@@ -1049,6 +1049,27 @@ def test_prevent_empty_commit_if_no_new_addition(self, repo_url: RepoUrl) -> Non
         )
         assert logs.records[1].levelname == "WARNING"
 
+    @use_tmp_repo()
+    def test_empty_commit_on_pr(self, repo_url: RepoUrl) -> None:
+        """
+        Regression test for #2411. Revision was quoted twice, leading to a HTTP 404.
+
+        See https://github.com/huggingface/huggingface_hub/issues/2411.
+        """
+        pr = self._api.create_pull_request(repo_id=repo_url.repo_id, title="Test PR")
+
+        with self.assertLogs("huggingface_hub", level="WARNING"):
+            url = self._api.create_commit(
+                repo_id=repo_url.repo_id,
+                operations=[],
+                commit_message="Empty commit",
+                revision=pr.git_reference,
+            )
+
+        commits = self._api.list_repo_commits(repo_id=repo_url.repo_id, revision=pr.git_reference)
+        assert len(commits) == 1  # no 2nd commit
+        assert url.oid == commits[0].commit_id
+
     @use_tmp_repo()
     def test_continue_commit_without_existing_files(self, repo_url: RepoUrl) -> None:
         self._api.create_commit(