michael@0: #!/bin/bash
michael@0: 
michael@0: # Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: # Use of this source code is governed by a BSD-style license that can be
michael@0: # found in the LICENSE file.
michael@0: 
michael@0: # Usage: make_more_helpers.sh <directory_within_contents> <app_name>
michael@0: #
michael@0: # This script creates additional helper .app bundles for Chromium, based on
michael@0: # the existing helper .app bundle, changing their Mach-O header's flags to
michael@0: # enable and disable various features. Based on Chromium Helper.app, it will
michael@0: # create Chromium Helper EH.app, which has the MH_NO_HEAP_EXECUTION bit
michael@0: # cleared to support Chromium child processes that require an executable heap,
michael@0: # and Chromium Helper NP.app, which has the MH_PIE bit cleared to support
michael@0: # Chromium child processes that cannot tolerate ASLR.
michael@0: #
michael@0: # This script expects to be called from the chrome_exe target as a postbuild,
michael@0: # and operates directly within the built-up browser app's versioned directory.
michael@0: #
michael@0: # Each helper is adjusted by giving it the proper bundle name, renaming the
michael@0: # executable, adjusting several Info.plist keys, and changing the executable's
michael@0: # Mach-O flags.
michael@0: 
michael@0: set -eu
michael@0: 
michael@0: make_helper() {
michael@0:   local containing_dir="${1}"
michael@0:   local app_name="${2}"
michael@0:   local feature="${3}"
michael@0:   local flags="${4}"
michael@0: 
michael@0:   local helper_name="${app_name} Helper"
michael@0:   local helper_stem="${containing_dir}/${helper_name}"
michael@0:   local original_helper="${helper_stem}.app"
michael@0:   if [[ ! -d "${original_helper}" ]]; then
michael@0:     echo "${0}: error: ${original_helper} is a required directory" >& 2
michael@0:     exit 1
michael@0:   fi
michael@0:   local original_helper_exe="${original_helper}/Contents/MacOS/${helper_name}"
michael@0:   if [[ ! -f "${original_helper_exe}" ]]; then
michael@0:     echo "${0}: error: ${original_helper_exe} is a required file" >& 2
michael@0:     exit 1
michael@0:   fi
michael@0: 
michael@0:   local feature_helper="${helper_stem} ${feature}.app"
michael@0: 
michael@0:   rsync -acC --delete --include '*.so' "${original_helper}/" "${feature_helper}"
michael@0: 
michael@0:   local helper_feature="${helper_name} ${feature}"
michael@0:   local helper_feature_exe="${feature_helper}/Contents/MacOS/${helper_feature}"
michael@0:   mv "${feature_helper}/Contents/MacOS/${helper_name}" "${helper_feature_exe}"
michael@0: 
michael@0:   local change_flags="$(dirname "${0}")/change_mach_o_flags.py"
michael@0:   "${change_flags}" ${flags} "${helper_feature_exe}"
michael@0: 
michael@0:   local feature_info="${feature_helper}/Contents/Info"
michael@0:   local feature_info_plist="${feature_info}.plist"
michael@0: 
michael@0:   defaults write "${feature_info}" "CFBundleDisplayName" "${helper_feature}"
michael@0:   defaults write "${feature_info}" "CFBundleExecutable" "${helper_feature}"
michael@0: 
michael@0:   cfbundleid="$(defaults read "${feature_info}" "CFBundleIdentifier")"
michael@0:   feature_cfbundleid="${cfbundleid}.${feature}"
michael@0:   defaults write "${feature_info}" "CFBundleIdentifier" "${feature_cfbundleid}"
michael@0: 
michael@0:   cfbundlename="$(defaults read "${feature_info}" "CFBundleName")"
michael@0:   feature_cfbundlename="${cfbundlename} ${feature}"
michael@0:   defaults write "${feature_info}" "CFBundleName" "${feature_cfbundlename}"
michael@0: 
michael@0:   # As usual, defaults might have put the plist into whatever format excites
michael@0:   # it, but Info.plists get converted back to the expected XML format.
michael@0:   plutil -convert xml1 "${feature_info_plist}"
michael@0: 
michael@0:   # `defaults` also changes the file permissions, so make the file
michael@0:   # world-readable again.
michael@0:   chmod a+r "${feature_info_plist}"
michael@0: }
michael@0: 
michael@0: if [[ ${#} -ne 2 ]]; then
michael@0:   echo "usage: ${0} <directory_within_contents> <app_name>" >& 2
michael@0:   exit 1
michael@0: fi
michael@0: 
michael@0: DIRECTORY_WITHIN_CONTENTS="${1}"
michael@0: APP_NAME="${2}"
michael@0: 
michael@0: CONTENTS_DIR="${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}"
michael@0: CONTAINING_DIR="${CONTENTS_DIR}/${DIRECTORY_WITHIN_CONTENTS}"
michael@0: 
michael@0: make_helper "${CONTAINING_DIR}" "${APP_NAME}" "EH" "--executable-heap"
michael@0: make_helper "${CONTAINING_DIR}" "${APP_NAME}" "NP" "--no-pie"