--- /dev/null 2022-10-16 17:03:40.015999686 +0000

+++ bazel/configure_template.bzl 2022-11-07 22:08:29.135633955 +0000

@@ -0,0 +1,40 @@

+# 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.

+

+"""

+Define a rule to configure .in template files.

+

+We use a custom *.BUILD file for crc32c as it does not support Bazel.

+It requires configuring a `.in` file. This creates a rule to perform this

+configuration.

+"""

+

+def _configure_template_impl(ctx):

+ ctx.actions.expand_template(

+ template = ctx.file.template,

+ output = ctx.outputs.output,

+ substitutions = ctx.attr.substitutions,

+ )

+

+configure_template = rule(

+ implementation = _configure_template_impl,

+ attrs = {

+ "substitutions": attr.string_dict(default = {}),

+ "template": attr.label(

+ allow_single_file = True,

+ mandatory = True,

+ ),

+ "output": attr.output(mandatory = True),

+ },

+)