Split sign.sh into two pieces

chrome/installer/mac/make_signers.sh

-#!/bin/sh
+#!/bin/bash -p
 
 # Copyright (c) 2009 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.
 
-# This script creates sign.sh, the script that will be used to sign the
-# application bundle and inner bundles.  It also creates auxiliary files that
-# sign.sh needs to do its job, such as the custom resource rules used to sign
-# the outermost application bundle.  These files are placed in the Packaging
-# directory next to the .app bundle.  The packaging system is expected to run
-# sign.sh to sign everything.
+# This script creates sign_app.sh and sign_versioned_dir.sh, the scripts that
+# will be used to sign the application bundle and inner bundles. It also
+# creates auxiliary files that these scripts need to do their jobs, such as
+# the custom resource rules used to sign the outermost application bundle.
+# The build places these in the "${mac_product_name} Packaging" directory next
+# to the .app bundle. The packaging system is expected to run these scripts to
+# sign everything.
 
-set -e
+set -eu
 
-if [ $# -ne 3 ] ; then
-  echo "usage: ${0} PACKAGING_DIR MAC_PRODUCT_NAME VERSION" >& 2
+# Environment sanitization. Set a known-safe PATH. Clear environment variables
+# that might impact the interpreter's operation. The |bash -p| invocation
+# on the #! line takes the bite out of BASH_ENV, ENV, and SHELLOPTS (among
+# other features), but clearing them here ensures that they won't impact any
+# shell scripts used as utility programs. SHELLOPTS is read-only and can't be
+# unset, only unexported.
+export PATH="/usr/bin:/bin:/usr/sbin:/sbin"
+unset BASH_ENV CDPATH ENV GLOBIGNORE IFS POSIXLY_CORRECT
+export -n SHELLOPTS
+
+ME="$(basename "${0}")"
+readonly ME
+
+if [[ ${#} -ne 3 ]]; then
+  echo "usage: ${ME} packaging_dir mac_product_name version" >& 2
   exit 1
 fi
 
-PACKAGING_DIR="${1}"
-MAC_PRODUCT_NAME="${2}"
-VERSION="${3}"
+packaging_dir="${1}"
+mac_product_name="${2}"
+version="${3}"
 
-INPUT_DIR="$(dirname "${0}")"
-SIGN_SH_IN_FILE="${INPUT_DIR}/sign.sh.in"
-SIGN_SH_FILE="${PACKAGING_DIR}/sign.sh"
-BROWSER_APP_RULES_IN_FILE="${INPUT_DIR}/app_resource_rules.plist.in"
-BROWSER_APP_RULES_FILE="${PACKAGING_DIR}/app_resource_rules.plist"
+script_dir="$(dirname "${0}")"
+in_files=(
+  "${script_dir}/sign_app.sh.in"
+  "${script_dir}/sign_versioned_dir.sh.in"
+  "${script_dir}/app_resource_rules.plist.in"
+)
 
 # Double-backslash each dot: one backslash belongs in the regular expression,
 # and the other backslash tells sed not to treat the first backslash
 # specially.
-VERSION_REGEX="$(echo "${VERSION}" | sed -e 's/\./\\\\./g')"
+version_regex="$(echo "${version}" | sed -e 's/\./\\\\./g')"
 
-mkdir -p "${PACKAGING_DIR}"
-sed -e "s/@MAC_PRODUCT_NAME@/${MAC_PRODUCT_NAME}/g" \
-    -e "s/@VERSION@/${VERSION}/g" \
-    -e "s/@VERSION_REGEX@/${VERSION_REGEX}/g" \
-    < "${SIGN_SH_IN_FILE}" \
-    > "${SIGN_SH_FILE}"
-chmod +x "${SIGN_SH_FILE}"
+mkdir -p "${packaging_dir}"
 
-sed -e "s/@MAC_PRODUCT_NAME@/${MAC_PRODUCT_NAME}/g" \
-    -e "s/@VERSION@/${VERSION}/g" \
-    -e "s/@VERSION_REGEX@/${VERSION_REGEX}/g" \
-    < "${BROWSER_APP_RULES_IN_FILE}" \
-    > "${BROWSER_APP_RULES_FILE}"
+for in_file in "${in_files[@]}"; do
+  out_file="${packaging_dir}/$(basename "${in_file:0:${#in_file} - 3}")"
+  sed -e "s/@MAC_PRODUCT_NAME@/${mac_product_name}/g" \
+      -e "s/@VERSION@/${version}/g" \
+      -e "s/@VERSION_REGEX@/${version_regex}/g" \
+      < "${in_file}" \
+      > "${out_file}"
+
+  if [[ "${out_file: -3}" = ".sh" ]]; then
+    chmod +x "${out_file}"
+  fi
+done