Some polishing...

git-crup

 #!/bin/bash
 # Copyright (c) 2012 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.
 
 # A convenience script to largely replicate the behavior of `gclient sync` in a
 # submodule-based checkout.  Fetches latest commits for top-level solutions;
 # updates submodules; and runs post-sync hooks.
 
 export GIT_MERGE_AUTOEDIT=0
@@ skipping 35 matching lines @@
 
 serial_update() {
   ( cd "$1"
     $GIT_EXE $pull $pull_args -q origin | sed "s/^/[$1] /g"
     if [ $? -ne 0 ]; then
       return $?
     fi
     $GIT_EXE submodule --quiet sync
     $GIT_EXE ls-files -s | grep ^160000 | awk '{print $4}' |
     while read submod; do
-      $GIT_EXE submodule update --init "$submod" | sed "s|^|[$1/$submod] |g"
+      "$crup_runner" "$1/$submod"
     done
   )
 }
 
 while test $# -ne 0; do
   case "$1" in
     -j[0-9]*)
       j=$(echo "$1" | cut -c3-)
       ;;
     --jobs=[0-9]*)
@@ skipping 45 matching lines @@
 if ( echo test test | xargs -P 2 true 2>/dev/null ); then
   xargs_parallel=yes
 else
   if test "$j" != "1"; then
     echo "Warning: parallel execution is not supported on this platform." 1>&2
   fi
   xargs_parallel=no
 fi
 
 set -o pipefail
-
 if test "$xargs_parallel" = "yes"; then
   ( ls -d */.git | sed 's/\/\.git$//' |
    xargs $max_lines $replace_arg -P "$j" \
       "$crup_runner" replace_arg $GIT_EXE $pull $pull_args -q origin |
    xargs $max_lines -P "$j" "$crup_runner" )
 else 
   ls -d */.git |
   while read gitdir; do
     serial_update "${gitdir%%/.git}"
   done
 fi
 
 status=$?
 
 if [ "$hooks" = "yes" -a "$status" -eq 0 ]; then
   "$runhooks"
   status=$?
 fi
 
 echo
 exit $status