|  | # Copyright 2018 The Bazel Authors. All rights reserved. | 
|  | # | 
|  | # 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 | 
|  | # | 
|  | #    http://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. | 
|  | """Define a toolchain rule for the shell.""" | 
|  |  | 
|  | def _sh_toolchain_impl(ctx): | 
|  | """sh_toolchain rule implementation.""" | 
|  | return [platform_common.ToolchainInfo(path = ctx.attr.path)] | 
|  |  | 
|  | sh_toolchain = rule( | 
|  | attrs = { | 
|  | # Absolute path to the shell interpreter. | 
|  | "path": attr.string(), | 
|  | }, | 
|  | implementation = _sh_toolchain_impl, | 
|  | ) |