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# Copyright 2023 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 Starlark implementation of the proto_toolchain rule."""
load("@bazel_features//:features.bzl", "bazel_features")
load("//proto/modules:proto_common.bzl", "proto_common")
load("//proto/modules:proto_lang_toolchain_info.bzl", "ProtoLangToolchainInfo")
def _impl(ctx):
kwargs = {}
if getattr(proto_common, "INCOMPATIBLE_PASS_TOOLCHAIN_TYPE", False):
kwargs["toolchain_type"] = "//proto:toolchain_type"
# allowlist_different_package is only available after Bazel versions > 6.4.0
# therefore needs to be set conditionally. We are using bazel_features for this
# but there's no specific feature flag for `allowlist_different_package` so we'll
# just use module_extension_has_os_arch_dependent which checks if Bazel version >= 6.4.0
# See: https://github.com/protocolbuffers/protobuf/pull/14590#discussion_r1398778415
# See: https://github.com/bazel-contrib/bazel_features/blob/443861571a389ddc16d17690ab8e46ee87b4ea57/features.bzl#L25C5-L25C43
if bazel_features.external_deps.module_extension_has_os_arch_dependent:
kwargs["allowlist_different_package"] = None
return [
DefaultInfo(
files = depset(),
runfiles = ctx.runfiles(),
),
platform_common.ToolchainInfo(
proto = ProtoLangToolchainInfo(
out_replacement_format_flag = ctx.attr.command_line,
output_files = ctx.attr.output_files,
plugin = None,
runtime = None,
proto_compiler = ctx.attr.proto_compiler.files_to_run,
protoc_opts = ctx.fragments.proto.experimental_protoc_opts,
progress_message = ctx.attr.progress_message,
mnemonic = ctx.attr.mnemonic,
**kwargs
),
),
]
proto_toolchain = rule(
_impl,
attrs =
{
"progress_message": attr.string(default = "Generating Descriptor Set proto_library %{label}"),
"mnemonic": attr.string(default = "GenProtoDescriptorSet"),
"command_line": attr.string(default = "--descriptor_set_out=%s"),
"output_files": attr.string(values = ["single", "multiple", "legacy"], default = "single"),
"proto_compiler": attr.label(
cfg = "exec",
executable = True,
allow_files = True, # Used by mocks in tests. Consider fixing tests and removing it.
),
},
provides = [platform_common.ToolchainInfo],
fragments = ["proto"],
)
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