Enable ignoring missing constraints on py3.14

Author: Dev-iL

dev/breeze/src/airflow_breeze/commands/release_management_commands.py

@@ -1429,11 +1429,15 @@ def generate_constraints(
                 f"--upgrade-to-newer-dependencies\n"
             )
         sys.exit(1)
+    # TODO: Remove the Python 3.14 special-case once constraints-3.14.txt exists on the constraints branch.
     if run_in_parallel:
         python_version_list = get_python_version_list(python_versions)
         shell_params_list = [
             ShellParams(
                 airflow_constraints_mode=airflow_constraints_mode,
+                airflow_fallback_no_constraints_installation=(
+                    allow_missing_previous_constraints_file and python == "3.14"
+                ),
                 allow_missing_previous_constraints_file=allow_missing_previous_constraints_file,
                 github_repository=github_repository,
                 python=python,
@@ -1453,6 +1457,9 @@ def generate_constraints(
     else:
         shell_params = ShellParams(
             airflow_constraints_mode=airflow_constraints_mode,
+            airflow_fallback_no_constraints_installation=(
+                allow_missing_previous_constraints_file and python == "3.14"
+            ),
             allow_missing_previous_constraints_file=allow_missing_previous_constraints_file,
             github_repository=github_repository,
             python=python,

dev/breeze/src/airflow_breeze/params/shell_params.py

@@ -163,6 +163,7 @@ class ShellParams:
     airflow_constraints_location: str = ""
     airflow_constraints_mode: str = ALLOWED_CONSTRAINTS_MODES_CI[0]
     airflow_constraints_reference: str = ""
+    airflow_fallback_no_constraints_installation: bool = False
     airflow_extras: str = ""
     allow_missing_previous_constraints_file: bool = False
     allow_pre_releases: bool = False
@@ -631,6 +632,11 @@ def env_variables_for_docker_commands(self) -> dict[str, str]:
             "ALLOW_MISSING_PREVIOUS_CONSTRAINTS_FILE",
             self.allow_missing_previous_constraints_file,
         )
+        _set_var(
+            _env,
+            "AIRFLOW_FALLBACK_NO_CONSTRAINTS_INSTALLATION",
+            self.airflow_fallback_no_constraints_installation,
+        )
         _set_var(_env, "BACKEND", self.backend)
         if self.backend == "custom":
             _set_var(_env, "AIRFLOW__DATABASE__SQL_ALCHEMY_CONN", self.custom_db_url or None)

dev/breeze/tests/test_release_management_commands.py

@@ -19,7 +19,7 @@
 from airflow_breeze.utils.confirm import Answer
 
 
-def test_generate_constraints_forwards_allow_missing_previous_constraints_file(monkeypatch):
+def test_generate_constraints_enables_bootstrap_flags_for_python_3_14(monkeypatch):
     import airflow_breeze.commands.release_management_commands as module
 
     captured_shell_params = {}
@@ -50,3 +50,38 @@ def fake_run_generate_constraints(shell_params, output):
     )
 
     assert captured_shell_params["value"].allow_missing_previous_constraints_file is True
+    assert captured_shell_params["value"].airflow_fallback_no_constraints_installation is True
+
+
+def test_generate_constraints_keeps_no_constraints_fallback_disabled_for_older_python(monkeypatch):
+    import airflow_breeze.commands.release_management_commands as module
+
+    captured_shell_params = {}
+
+    monkeypatch.setattr(module, "perform_environment_checks", lambda: None)
+    monkeypatch.setattr(module, "check_remote_ghcr_io_commands", lambda: None)
+    monkeypatch.setattr(module, "fix_ownership_using_docker", lambda: None)
+    monkeypatch.setattr(module, "cleanup_python_generated_files", lambda: None)
+    monkeypatch.setattr(module, "user_confirm", lambda *args, **kwargs: Answer.YES)
+
+    def fake_run_generate_constraints(shell_params, output):
+        captured_shell_params["value"] = shell_params
+        return 0, "constraints-source-providers:3.13"
+
+    monkeypatch.setattr(module, "run_generate_constraints", fake_run_generate_constraints)
+
+    module.generate_constraints.callback(
+        airflow_constraints_mode="constraints-source-providers",
+        allow_missing_previous_constraints_file=True,
+        debug_resources=False,
+        github_repository="apache/airflow",
+        parallelism=1,
+        python="3.13",
+        python_versions="3.13",
+        run_in_parallel=False,
+        skip_cleanup=False,
+        use_uv=True,
+    )
+
+    assert captured_shell_params["value"].allow_missing_previous_constraints_file is True
+    assert captured_shell_params["value"].airflow_fallback_no_constraints_installation is False

dev/breeze/tests/test_shell_params.py

@@ -166,6 +166,14 @@
             },
             id="allow missing previous constraints file",
         ),
+        pytest.param(
+            {},
+            {"airflow_fallback_no_constraints_installation": True},
+            {
+                "AIRFLOW_FALLBACK_NO_CONSTRAINTS_INSTALLATION": "true",
+            },
+            id="airflow fallback no constraints installation",
+        ),
         pytest.param(
             {"PYTHONWARNINGS": "default"},
             {},