build/chip/linux/gen_gdbus_wrapper.py

#!/usr/bin/env python

# Copyright (c) 2020 Project CHIP Authors
#
# 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.

import argparse
import subprocess
import sys


def main():
    parser = argparse.ArgumentParser(description="Generate D-Bus bindings")
    parser.add_argument("--output-c",
                        help="The source file to generate containing the GDBus proxy implementation")
    parser.add_argument("--output-h",
                        help="The header file to generate containing the GDBus proxy interface")
    # Parse our options and forward anything else.
    options, extra_args = parser.parse_known_args()

    if options.output_c:
        subprocess.check_call(["gdbus-codegen", "--body", "--output", options.output_c] + extra_args)
        with open(options.output_c) as f:
            content = f.read()
        # Replace configuration header file generated by gdbus-codegen.
        content = content.replace('include "config.h"', 'include "BuildConfig.h"')
        with open(options.output_c, "w") as f:
            f.write(content)

    if options.output_h:
        subprocess.check_call(["gdbus-codegen", "--header", "--output", options.output_h] + extra_args)
        with open(options.output_h) as f:
            content = f.read()
        # Code generated with new gdbus-codegen adds checks for `GLIB_VERSION_2_84` which might
        # not yet be defined when compiling with older glib versions (e.g. cross-compilation).
        # This manually provided definition solves the problem with undefined identifiers.
        content = content.replace("G_BEGIN_DECLS", """
#ifndef GLIB_VERSION_2_84
#define GLIB_VERSION_2_84 G_ENCODE_VERSION(2, 84)
#endif
G_BEGIN_DECLS
""")
        with open(options.output_h, "w") as f:
            f.write(content)

    return 0


if __name__ == '__main__':
    sys.exit(main())