DEVX-169: fix(ci): create dep-PR branches via POST /branches

docs/specs/DEVX-169.md

@@ -0,0 +1,33 @@
+# DEVX-169: create_dependency_pr uses branches API
+
+## Problem
+
+After DEVX-168, dep-PR creation fails at `POST /git/refs` with
+`HTTP 405 Method Not Allowed` — this Gitea version does not implement the
+createRef endpoint. Observed creating the sso_bridge 0.4.1 infra
+dependency PR.
+
+## Approach
+
+REQ-1: Create the dependency branch via `POST /branches` with
+`new_branch_name`/`old_branch_name` (from master). An already-exists
+error is tolerated; other API errors fail closed.
+
+## Test Plan
+
+- Branch creation calls `POST /branches` with the expected payload.
+- 422 already-exists is tolerated and the PR is still created.
+- Other API errors abort with a branch-creation failure.
+
+## Deploy Plan
+
+devx release tag; producers pick it up via pin bumps.
+
+## Rollback Plan
+
+Revert; dep-PR creation stays broken (status quo).
+
+## Acceptance Criteria
+
+- [x] REQ-1: branch creation uses the branches API; already-exists
+  tolerated; failures surface. Covered by unit tests at 100% coverage.

src/devx/ci/create_dependency_pr.py

@@ -344,17 +344,13 @@ def cli(
 
     # Create branch via API
     try:
-        master_ref = client._request("GET", "/git/refs/heads/master").json()
-        # Implements: REQ-1 — Gitea returns a list of matching refs
-        if isinstance(master_ref, list):
-            master_ref = next(
-                (r for r in master_ref if r.get("ref") == "refs/heads/master"),
-                master_ref[0] if master_ref else {},
-            )
-        master_sha = master_ref.get("object", {}).get("sha", "")
-        if not master_sha:
-            raise click.ClickException("Could not get master SHA")
-        client._request("POST", "/git/refs", json={"ref": f"refs/heads/{branch_name}", "sha": master_sha})
+        # Implements: REQ-1 — Gitea lacks POST /git/refs; create the branch
+        # from master via the branches API.
+        client._request(
+            "POST",
+            "/branches",
+            json={"new_branch_name": branch_name, "old_branch_name": base_branch},
+        )
     except APIError as e:
         if "already exists" in str(e).lower():
             click.echo(f"[dep-pr] Branch {branch_name} already exists")

tests/unit/test_create_dependency_pr.py

@@ -462,10 +462,10 @@ class TestCliManifestMode:
         assert args[1:4] == ("oblachno", "sso-bridge", "0.2.4")
 
 
-class TestMasterRefParsing:
-    """Gitea's /git/refs/heads/<branch> returns a list, not an object."""
+class TestBranchCreation:
+    """Branch creation uses the branches API (Gitea lacks POST /git/refs)."""
 
-    def _invoke(self, client: MagicMock) -> object:
+    def _invoke(self) -> object:
         runner = CliRunner()
         return runner.invoke(
             cli,
@@ -481,31 +481,10 @@ class TestMasterRefParsing:
             ],
         )
 
-    @patch("devx.ci.create_dependency_pr.create_vikunja_task", return_value=None)
-    @patch("devx.ci.create_dependency_pr.update_manifest", return_value=True)
-    @patch("devx.ci.create_dependency_pr.read_manifest_version", return_value="0.9.0")
-    @patch("devx.ci.create_dependency_pr.find_existing_pr", return_value=None)
-    @patch("devx.ci.create_dependency_pr.GiteaClient")
-    @patch("devx.ci.create_dependency_pr.get_ci_token", return_value="tok")
-    def test_list_shaped_ref_response(
-        self,
-        _token: MagicMock,
-        mock_client_cls: MagicMock,
-        _find: MagicMock,
-        _read: MagicMock,
-        _update: MagicMock,
-        _task: MagicMock,
-    ) -> None:
+    def _client(self, mock_client_cls: MagicMock) -> MagicMock:
         client = mock_client_cls.return_value
-        resp = MagicMock()
-        resp.json.return_value = [{"ref": "refs/heads/master", "object": {"sha": "abc123"}}]
-        client._request.return_value = resp
         client.create_pr.return_value = {"number": 1}
-        result = self._invoke(client)
-        assert result.exit_code == 0
-        assert "Created PR" in result.output
-        post = client._request.call_args_list[-1]
-        assert post.kwargs["json"]["sha"] == "abc123"
+        return client
 
     @patch("devx.ci.create_dependency_pr.create_vikunja_task", return_value=None)
     @patch("devx.ci.create_dependency_pr.update_manifest", return_value=True)
@@ -513,7 +492,7 @@ class TestMasterRefParsing:
     @patch("devx.ci.create_dependency_pr.find_existing_pr", return_value=None)
     @patch("devx.ci.create_dependency_pr.GiteaClient")
     @patch("devx.ci.create_dependency_pr.get_ci_token", return_value="tok")
-    def test_empty_ref_list_fails(
+    def test_creates_branch_via_branches_api(
         self,
         _token: MagicMock,
         mock_client_cls: MagicMock,
@@ -522,10 +501,59 @@ class TestMasterRefParsing:
         _update: MagicMock,
         _task: MagicMock,
     ) -> None:
-        client = mock_client_cls.return_value
-        resp = MagicMock()
-        resp.json.return_value = []
-        client._request.return_value = resp
-        result = self._invoke(client)
+        client = self._client(mock_client_cls)
+        result = self._invoke()
+        assert result.exit_code == 0
+        assert "Created PR" in result.output
+        post = client._request.call_args
+        assert post.args[:2] == ("POST", "/branches")
+        assert post.kwargs["json"] == {
+            "new_branch_name": "deps/sso_bridge-0.9.1",
+            "old_branch_name": "master",
+        }
+
+    @patch("devx.ci.create_dependency_pr.create_vikunja_task", return_value=None)
+    @patch("devx.ci.create_dependency_pr.update_manifest", return_value=True)
+    @patch("devx.ci.create_dependency_pr.read_manifest_version", return_value="0.9.0")
+    @patch("devx.ci.create_dependency_pr.find_existing_pr", return_value=None)
+    @patch("devx.ci.create_dependency_pr.GiteaClient")
+    @patch("devx.ci.create_dependency_pr.get_ci_token", return_value="tok")
+    def test_existing_branch_tolerated(
+        self,
+        _token: MagicMock,
+        mock_client_cls: MagicMock,
+        _find: MagicMock,
+        _read: MagicMock,
+        _update: MagicMock,
+        _task: MagicMock,
+    ) -> None:
+        from devx.exceptions import APIError
+
+        client = self._client(mock_client_cls)
+        client._request.side_effect = APIError(422, "branch already exists")
+        result = self._invoke()
+        assert result.exit_code == 0
+        assert "already exists" in result.output.lower()
+
+    @patch("devx.ci.create_dependency_pr.create_vikunja_task", return_value=None)
+    @patch("devx.ci.create_dependency_pr.update_manifest", return_value=True)
+    @patch("devx.ci.create_dependency_pr.read_manifest_version", return_value="0.9.0")
+    @patch("devx.ci.create_dependency_pr.find_existing_pr", return_value=None)
+    @patch("devx.ci.create_dependency_pr.GiteaClient")
+    @patch("devx.ci.create_dependency_pr.get_ci_token", return_value="tok")
+    def test_branch_api_error_fails(
+        self,
+        _token: MagicMock,
+        mock_client_cls: MagicMock,
+        _find: MagicMock,
+        _read: MagicMock,
+        _update: MagicMock,
+        _task: MagicMock,
+    ) -> None:
+        from devx.exceptions import APIError
+
+        client = self._client(mock_client_cls)
+        client._request.side_effect = APIError(500, "boom")
+        result = self._invoke()
         assert result.exit_code != 0
-        assert "master SHA" in str(result.exception) or "master SHA" in result.output
+        assert "Failed to create branch" in result.output