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# Copyright 2020 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.
"""A rule for generating a `FileDescriptorSet` with all transitive dependencies.
This module contains the definition of `proto_descriptor_set`, a rule that
collects all `FileDescriptorSet`s from its transitive dependencies and generates
a single `FileDescriptorSet` containing all the `FileDescriptorProto` from them.
"""
load("//proto/private:native.bzl", ProtoInfo = "NativeProtoInfo")
def _proto_descriptor_set_impl(ctx):
args = ctx.actions.args()
output = ctx.actions.declare_file("{}.pb".format(ctx.attr.name))
args.add(output)
descriptor_sets = depset(
transitive = [dep[ProtoInfo].transitive_descriptor_sets for dep in ctx.attr.deps],
)
args.add_all(descriptor_sets)
ctx.actions.run(
executable = ctx.executable._file_concat,
mnemonic = "ConcatFileDescriptorSet",
inputs = descriptor_sets,
outputs = [output],
arguments = [args],
)
return [
DefaultInfo(
files = depset([output]),
runfiles = ctx.runfiles(files = [output]),
),
]
proto_descriptor_set = rule(
implementation = _proto_descriptor_set_impl,
attrs = {
"deps": attr.label_list(
mandatory = False,
providers = [ProtoInfo],
doc = """
Sequence of `ProtoInfo`s to collect `FileDescriptorSet`s from.
""".strip(),
),
"_file_concat": attr.label(
default = "//tools/file_concat",
executable = True,
cfg = "exec",
),
},
doc = """
Collects all `FileDescriptorSet`s from `deps` and combines them into a single
`FileDescriptorSet` containing all the `FileDescriptorProto`.
""".strip(),
)
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