1*f578df4fSJingwen Chen# Copyright 2022 Google LLC 2*f578df4fSJingwen Chen# 3*f578df4fSJingwen Chen# Licensed under the Apache License, Version 2.0 (the "License"); 4*f578df4fSJingwen Chen# you may not use this file except in compliance with the License. 5*f578df4fSJingwen Chen# You may obtain a copy of the License at 6*f578df4fSJingwen Chen# 7*f578df4fSJingwen Chen# https://www.apache.org/licenses/LICENSE-2.0 8*f578df4fSJingwen Chen# 9*f578df4fSJingwen Chen# Unless required by applicable law or agreed to in writing, software 10*f578df4fSJingwen Chen# distributed under the License is distributed on an "AS IS" BASIS, 11*f578df4fSJingwen Chen# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*f578df4fSJingwen Chen# See the License for the specific language governing permissions and 13*f578df4fSJingwen Chen# limitations under the License. 14*f578df4fSJingwen Chen"""This module provides a custom Starlark rule used to create wrappers for targets that 15*f578df4fSJingwen Chencan have blaze build --check_licenses executed against them.""" 16*f578df4fSJingwen Chen 17*f578df4fSJingwen Chendef _shim_rule_impl(ctx): 18*f578df4fSJingwen Chen # This rule doesn't need to return anything. It only exists to propagate the dependency supplied 19*f578df4fSJingwen Chen # by the label_flag 20*f578df4fSJingwen Chen return [] 21*f578df4fSJingwen Chen 22*f578df4fSJingwen Chenshim_rule = rule( 23*f578df4fSJingwen Chen doc = """This rule exists to configure a dependent target via label. An instantiation of this 24*f578df4fSJingwen Chen rule is then used as a dependency for the legacy_check_target rule, which can be built with --check_licenses 25*f578df4fSJingwen Chen to get the effect of running --check_licenses on an arbitrary target which may or may not have a distribs 26*f578df4fSJingwen Chen attribute""", 27*f578df4fSJingwen Chen implementation = _shim_rule_impl, 28*f578df4fSJingwen Chen # The definition of this attribute creates a dependency relationship on the manually provided label. 29*f578df4fSJingwen Chen attrs = {"target": attr.label(default = ":check_licenses_target")}, 30*f578df4fSJingwen Chen) 31