[ISV-5374] Add check to suggest FBC for non-FBC operators (#744)

* [ISV-5374] Add check to suggest FBC for non-FBC operators

operator-pipeline-images/operatorcert/static_tests/community/bundle.py

@@ -441,3 +441,44 @@ def check_replaces_availability(bundle: Bundle) -> Iterator[CheckResult]:
         f"`{replaces_bundle}` - `{replaces_ocp_version_str}`"
     )
     yield from []
+
+
+NON_FBC_SUGGESTION = (
+    "[File Based Catalog (FBC)]"
+    "(https://github.com/redhat-openshift-ecosystem/community-operators-prod/"
+    "discussions/5031#discussion-7097441) "
+    "is a new way to manage operator metadata. "
+    "This operator does not use FBC. Consider [migrating]"
+    "(https://redhat-openshift-ecosystem.github.io/operator-pipelines/users/fbc_onboarding/) "
+    "for better maintainability."
+)
+NON_FBC_WARNING = (
+    "[File Based Catalog (FBC)]"
+    "(https://github.com/redhat-openshift-ecosystem/community-operators-prod/"
+    "discussions/5031#discussion-7097441) "
+    "is a new way to manage operator metadata. "
+    "This operator does not use FBC and it is recommended for new operators to "
+    "[start directly with FBC]"
+    "(https://redhat-openshift-ecosystem.github.io/operator-pipelines/users/fbc_workflow/). "
+    "The use of FBC will be mandatory for new operators from February 2025."
+)
+
+
+@skip_fbc
+def check_using_fbc(bundle: Bundle) -> Iterator[CheckResult]:
+    """
+    This check is used only for non-FBC bundles and suggests
+    using the File Based Catalog for new Operators
+    or recommends migrating existing Operators to FBC.
+
+    Args:
+        bundle (Bundle): Tested operator bundle
+    """
+    all_bundles = set(bundle.operator.all_bundles())
+    other_bundles = all_bundles - {bundle}
+    if other_bundles:
+        # not a first bundle, existing operator
+        yield Warn(NON_FBC_SUGGESTION)
+    else:
+        # TODO: change to Fail when FBC mandatory for new operators
+        yield Warn(NON_FBC_WARNING)

operator-pipeline-images/tests/static_tests/community/test_bundle.py

@@ -15,6 +15,7 @@
     check_api_version_constraints,
     check_replaces_availability,
     check_upgrade_graph_loop,
+    check_using_fbc,
     ocp_to_k8s_ver,
 )
 from semver import Version
@@ -673,3 +674,43 @@ def test_check_replaces_availability(
     errors = list(check_replaces_availability(bundle))
 
     assert set(errors) == expected
+
+
+@pytest.mark.parametrize(
+    "files, bundle_to_check, expected",
+    [
+        pytest.param(
+            [
+                bundle_files("hello", "0.0.1"),
+            ],
+            ("hello", "0.0.1"),
+            "is recommended for new operators",
+            id="New bundle warning",
+        ),
+        pytest.param(
+            [
+                bundle_files("hello", "0.0.1"),
+                bundle_files("hello", "0.0.2"),
+            ],
+            ("hello", "0.0.2"),
+            "This operator does not use FBC. Consider",
+            id="Updating existing operator",
+        ),
+    ],
+)
+def test_using_fbc(
+    tmp_path: Path,
+    files: list[dict[str, Any]],
+    bundle_to_check: tuple[str, str],
+    expected: str,
+) -> None:
+    create_files(tmp_path, *files)
+    repo = Repo(tmp_path)
+    operator_name, bundle_version = bundle_to_check
+    operator = repo.operator(operator_name)
+    bundle = operator.bundle(bundle_version)
+
+    results = list(check_using_fbc(bundle))
+
+    assert len(results) == 1
+    assert expected in results[0].reason