build_symbol_archive.py

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#!/usr/bin/env python

# Copyright 2018 The Chromium Authors. All rights reserved.

# Use of this source code is governed by a BSD-style license that can be

# found in the LICENSE file.

"""Creates a compressed archive of unstripped binaries cataloged by

"ids.txt"."""

import argparse

import os

import subprocess

import sys

import tarfile

def main(args):

  parser = argparse.ArgumentParser()

  parser.add_argument('ids_txt', type=str, nargs=1,

                      help='Path to ids.txt files.')

  parser.add_argument('-o', '--output_tarball', nargs=1, type=str,

                      help='Path which the tarball will be written to.')

  parser.add_argument('--fuchsia-build-id-dir', type=str, required=True,

                      help='Directory containing symbols for SDK prebuilts.')

  args = parser.parse_args(args)

  ids_txt = args.ids_txt[0]

  build_ids_archive = tarfile.open(args.output_tarball[0], 'w:bz2')

  for line in open(ids_txt, 'r'):

    build_id, binary_path = line.strip().split(' ')

    # Look for prebuilt symbols in the SDK first.

    symbol_source_path = os.path.join(args.fuchsia_build_id_dir,

                                      build_id[:2],

                                      build_id[2:] + '.debug')

    if not os.path.exists(symbol_source_path):

      symbol_source_path = os.path.abspath(

          os.path.join(os.path.dirname(ids_txt), binary_path))

      if os.path.getsize(symbol_source_path) == 0:

        # This is a prebuilt which wasn't accompanied by SDK symbols.

        continue

    # Exclude stripped binaries (indicated by their lack of symbol tables).

    readelf_output = subprocess.check_output(

        ['readelf', '-S', symbol_source_path], universal_newlines=True)

    if not '.symtab' in readelf_output:

      continue

    # Archive the unstripped ELF binary, placing it in a hierarchy keyed to the

    # GNU build ID. The binary resides in a directory whose name is the first

    # two characters of the build ID, with the binary file itself named after

    # the remaining characters of the build ID. So, a binary file with the build

    # ID "deadbeef" would be located at the path 'de/adbeef.debug'.

    build_ids_archive.add(symbol_source_path,

                          '%s/%s.debug' % (build_id[:2], build_id[2:]))

  return 0

if __name__ == '__main__':

  sys.exit(main(sys.argv[1:]))