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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""This module provides a custom Starlark rule used to create wrappers for targets that
+can have blaze build --check_licenses executed against them."""
+
+def _shim_rule_impl(ctx):
+ # This rule doesn't need to return anything. It only exists to propagate the dependency supplied
+ # by the label_flag
+ return []
+
+shim_rule = rule(
+ doc = """This rule exists to configure a dependent target via label. An instantiation of this
+ rule is then used as a dependency for the legacy_check_target rule, which can be built with --check_licenses
+ to get the effect of running --check_licenses on an arbitrary target which may or may not have a distribs
+ attribute""",
+ implementation = _shim_rule_impl,
+ # The definition of this attribute creates a dependency relationship on the manually provided label.
+ attrs = {"target": attr.label(default = ":check_licenses_target")},
+)