ICU 56 step 6: Check in the pre-built ICU data

scripts/update.sh

 #!/bin/bash
 # Copyright (c) 2016 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 is used to prepare for a major version update of ICU (e.g. from
 # 54.1 to 56.1). Running this script is step 1 in README.chromium.
 
 if [ $# -lt 1 ];
 then
-  echo "Usage: $0 version (e.g. '56-1')"
+  echo "Usage: "$0" version (e.g. '56-1')" >&2
   exit 1
 fi
 
 version="$1"
 repoprefix="http://source.icu-project.org/repos/icu/icu/tags/release-"
 repo="${repoprefix}${version}"
 treeroot="$(dirname "$0")/.."
 
 # Check if the repo for $version is available.
 svn ls "${repo}" > /dev/null 2>&1  || \
-    { echo "${repo} does not exist."; exit 2; }
+    { echo "${repo} does not exist." >&2; exit 2; }
 
 echo "Cleaning up source/ ..."
 for file in source license.html readme.html APIChangeReport.html
 do
   rm -rf "${treeroot}/${file}"
 done
 
 echo "Download ${version} from the upstream repository ..."
 for file in source license.html readme.html APIChangeReport.html
 do
@@ skipping 11 matching lines @@
 do
   # $line is not quoted to expand "*html.ucm".
   git checkout -- "${treeroot}/source/data/"${line}
 done < "${treeroot}/scripts/data_files_to_preserve.txt"
 
 echo "Patching configure to work without source/layout(ex) directories ..."
 sed -i.orig -e '/^ac_config_files=/ s:\ layout\(ex\)\{0,1\}/Makefile::g' \
   "${treeroot}/source/configure"
 rm -f "${treeroot}/source/configure.orig"
 
+# TODO(jshin): Automatically update BUILD.gn and icu.gypi with the updated
+# list of source files.
+
 echo "Done"