1# Copyright 2022 Google LLC 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# https://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14"""This module provides a custom Starlark rule used to create wrappers for targets that 15can have blaze build --check_licenses executed against them.""" 16 17def _shim_rule_impl(ctx): 18 # This rule doesn't need to return anything. It only exists to propagate the dependency supplied 19 # by the label_flag 20 return [] 21 22shim_rule = rule( 23 doc = """This rule exists to configure a dependent target via label. An instantiation of this 24 rule is then used as a dependency for the legacy_check_target rule, which can be built with --check_licenses 25 to get the effect of running --check_licenses on an arbitrary target which may or may not have a distribs 26 attribute""", 27 implementation = _shim_rule_impl, 28 # The definition of this attribute creates a dependency relationship on the manually provided label. 29 attrs = {"target": attr.label(default = ":check_licenses_target")}, 30) 31