build/mac/make_more_helpers.sh

   1 #!/bin/bash
   2
   3 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style license that can be
   5 # found in the LICENSE file.
   6
   7 # Usage: make_more_helpers.sh <directory_within_contents> <app_name>
   8 #
   9 # This script creates additional helper .app bundles for Chromium, based on
  10 # the existing helper .app bundle, changing their Mach-O header's flags to
  11 # enable and disable various features. Based on Chromium Helper.app, it will
  12 # create Chromium Helper EH.app, which has the MH_NO_HEAP_EXECUTION bit
  13 # cleared to support Chromium child processes that require an executable heap,
  14 # and Chromium Helper NP.app, which has the MH_PIE bit cleared to support
  15 # Chromium child processes that cannot tolerate ASLR.
  16 #
  17 # This script expects to be called from the chrome_exe target as a postbuild,
  18 # and operates directly within the built-up browser app's versioned directory.
  19 #
  20 # Each helper is adjusted by giving it the proper bundle name, renaming the
  21 # executable, adjusting several Info.plist keys, and changing the executable's
  22 # Mach-O flags.
  23
  24 set -eu
  25
  26 make_helper() {
  27   local containing_dir="${1}"
  28   local app_name="${2}"
  29   local feature="${3}"
  30   local flags="${4}"
  31
  32   local helper_name="${app_name} Helper"
  33   local helper_stem="${containing_dir}/${helper_name}"
  34   local original_helper="${helper_stem}.app"
  35   if [[ ! -d "${original_helper}" ]]; then
  36     echo "${0}: error: ${original_helper} is a required directory" >& 2
  37     exit 1
  38   fi
  39   local original_helper_exe="${original_helper}/Contents/MacOS/${helper_name}"
  40   if [[ ! -f "${original_helper_exe}" ]]; then
  41     echo "${0}: error: ${original_helper_exe} is a required file" >& 2
  42     exit 1
  43   fi
  44
  45   local feature_helper="${helper_stem} ${feature}.app"
  46
  47   rsync -acC --delete --include '*.so' "${original_helper}/" "${feature_helper}"
  48
  49   local helper_feature="${helper_name} ${feature}"
  50   local helper_feature_exe="${feature_helper}/Contents/MacOS/${helper_feature}"
  51   mv "${feature_helper}/Contents/MacOS/${helper_name}" "${helper_feature_exe}"
  52
  53   local change_flags="$(dirname "${0}")/change_mach_o_flags.py"
  54   "${change_flags}" ${flags} "${helper_feature_exe}"
  55
  56   local feature_info="${feature_helper}/Contents/Info"
  57   local feature_info_plist="${feature_info}.plist"
  58
  59   defaults write "${feature_info}" "CFBundleDisplayName" "${helper_feature}"
  60   defaults write "${feature_info}" "CFBundleExecutable" "${helper_feature}"
  61
  62   cfbundleid="$(defaults read "${feature_info}" "CFBundleIdentifier")"
  63   feature_cfbundleid="${cfbundleid}.${feature}"
  64   defaults write "${feature_info}" "CFBundleIdentifier" "${feature_cfbundleid}"
  65
  66   cfbundlename="$(defaults read "${feature_info}" "CFBundleName")"
  67   feature_cfbundlename="${cfbundlename} ${feature}"
  68   defaults write "${feature_info}" "CFBundleName" "${feature_cfbundlename}"
  69
  70   # As usual, defaults might have put the plist into whatever format excites
  71   # it, but Info.plists get converted back to the expected XML format.
  72   plutil -convert xml1 "${feature_info_plist}"
  73
  74   # `defaults` also changes the file permissions, so make the file
  75   # world-readable again.
  76   chmod a+r "${feature_info_plist}"
  77 }
  78
  79 if [[ ${#} -ne 2 ]]; then
  80   echo "usage: ${0} <directory_within_contents> <app_name>" >& 2
  81   exit 1
  82 fi
  83
  84 DIRECTORY_WITHIN_CONTENTS="${1}"
  85 APP_NAME="${2}"
  86
  87 CONTENTS_DIR="${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}"
  88 CONTAINING_DIR="${CONTENTS_DIR}/${DIRECTORY_WITHIN_CONTENTS}"
  89
  90 make_helper "${CONTAINING_DIR}" "${APP_NAME}" "EH" "--executable-heap"
  91 make_helper "${CONTAINING_DIR}" "${APP_NAME}" "NP" "--no-pie"