build_libbpf

#!/usr/bin/env python3
# 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.

""" This programs builds a libbpf static library and places it in the runtime
    folder. The library and its headers are required by the kernel target.
"""

import os
import sys
sys.path.insert(0, os.path.dirname(
    os.path.realpath(__file__)) + '/../../tools')
import testutils

VERBOSE = True


def create_dir(directory):
    """ Create the folder, if it does not exit yet"""
    if not directory == "" and not os.path.exists(directory):
        os.makedirs(directory)


def main():
    outputs = {"stdout": None, "stderr": None}
    file_dir = os.path.dirname(os.path.realpath(__file__))
    libbpf_dir = "%s/runtime/contrib/libbpf" % file_dir
    libbpf_src_dir = "%s/src" % libbpf_dir
    libbpf_build_dir = "%s/build" % libbpf_src_dir
    libbpf_target_dir = "%s/runtime" % file_dir
    # Download submodule if it has not been initialized yet
    git_cmd = "git submodule update --init %s" % libbpf_dir
    # We ignore the error that is thrown here
    testutils.run_timeout(verbose=VERBOSE, args=git_cmd,
                          timeout=20, outputs=outputs,
                          errmsg="Could not initialize libbpf submodule")
    # Create the libbpf build directory
    create_dir(libbpf_build_dir)
    # Build libbpf
    mk_cmd = "make -C %s install " % libbpf_src_dir
    mk_cmd += "BUILD_STATIC_ONLY=y "
    mk_cmd += "OBJDIR=%s " % libbpf_build_dir
    mk_cmd += "DESTDIR=%s " % libbpf_target_dir
    err = testutils.run_timeout(verbose=VERBOSE, args=mk_cmd,
                                timeout=20, outputs=outputs,
                                errmsg="Could not build libbpf")
    return err


if __name__ == '__main__':
    main()