Add --sync option, to only sync submodules.

Also add git-crsync as shorthand for `git crup --sync`.

TBR=iannucci@chromium.org

BUG=

Review URL: https://codereview.chromium.org/12279006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@182767 0039d316-1c4b-4281-b951-d872f2087c98

crup-runner.sh

@@ -1,5 +1,21 @@
 #!/bin/bash
 
+update_toplevel () {
+  # Don't "pull" if checkout is not on a named branch
+  if test "$2" = "pull" && ( ! git symbolic-ref HEAD >/dev/null 2>/dev/null ); then
+    first_args="$1 fetch"
+  else
+    first_args="$1 $2"
+  fi
+  shift 2
+  echo "[$solution] $first_args $@" 1>&2
+  $first_args $@ | sed "s/^/[$solution] /g" 1>&2
+  status=$?
+  if [ "$status" -ne 0 ]; then
+    exit $status
+  fi
+}
+
 set_target_os () {
   # Get the os we're building for.  On first run, this will be unset.
   target_os=$(git config target.os 2>/dev/null)
@@ -70,18 +86,9 @@ if [ "$solution" = "$1" ]; then
     exit 0
   fi
 
-  # Don't "pull" if checkout is not on a named branch
   shift
-  if test "$2" = "pull" && ( ! git symbolic-ref HEAD >/dev/null 2>/dev/null ); then
-    first_args="$1 fetch"
-  else
-    first_args="$1 $2"
-  fi
-  shift 2
-  $first_args $@ | sed "s/^/[$solution] /g" 1>&2
-  status=$?
-  if [ "$status" -ne 0 ]; then
-    exit $status
+  if test $# -ne 0; then
+    update_toplevel "$@"
   fi
 
   set_target_os

git-crsync

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+exec bash git-crup --sync "$@"

git-crup

@@ -45,16 +45,18 @@ fi
 
 usage() {
   cat <<EOF
-Usage: git-crup [-n|--dry-run] [--fetch] [-j|--jobs [jobs]]
+Usage: git-crup [-n|--dry-run] [--fetch|--sync] [-j|--jobs [jobs]]
     [--no-hooks] [<args to git-pull or git-fetch>]
 EOF
 }
 
 serial_update() {
   ( cd "$1"
-    $GIT_EXE $pull $pull_args -q origin | sed "s/^/[$1] /g"
-    if [ $? -ne 0 ]; then
-      return $?
+    if test -n "$toplevel_cmd"; then
+      $toplevel_cmd | sed "s/^/[$1] /g"
+      if [ $? -ne 0 ]; then
+        return $?
+      fi
     fi
     $GIT_EXE submodule --quiet sync
     $GIT_EXE ls-files -s | grep ^160000 | awk '{print $4}' |
@@ -93,6 +95,9 @@ while test $# -ne 0; do
     --fetch)
       pull=fetch
       ;;
+    --sync)
+      pull=
+      ;;
     --no-hooks|--nohooks)
       hooks=no
       ;;
@@ -124,11 +129,17 @@ else
   xargs_parallel=no
 fi
 
+if test -n "$pull"; then
+  toplevel_cmd="$GIT_EXE $pull $pull_args -q origin"
+else
+  toplevel_cmd=
+fi
+
 set -o pipefail
 if test "$xargs_parallel" = "yes"; then
   ( ls -d */.git | sed 's/\/\.git$//' |
    xargs $max_lines $replace_arg -P "$j" \
-      "$crup_runner" replace_arg $GIT_EXE $pull $pull_args -q origin |
+      "$crup_runner" replace_arg $toplevel_cmd |
    xargs $max_lines -P "$j" "$crup_runner" )
 else 
   ls -d */.git |