submodule: preserve all arguments exactly when recursing

Shell variables only hold strings, not lists of parameters,
so $orig_args after

        orig_args="$@"

fails to remember where each parameter starts and ends, if
some include whitespace.  So

        git submodule update \
                --reference='/var/lib/common objects.git' \
                --recursive --init

becomes

        git submodule update --reference=/var/lib/common \
                objects.git --recursive --init

in the inner repositories.  Use "git rev-parse --sq-quote" to
save parameters in quoted form ready for evaluation by the
shell, avoiding this problem.

Helped-By: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Kevin Ballard <kevin@sb.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -374,7 +374,7 @@ cmd_init()
 cmd_update()
 {
 	# parse $args after "submodule ... update".
-	orig_args="$@"
+	orig_args=$(git rev-parse --sq-quote "$@")
 	while test $# -ne 0
 	do
 		case "$1" in
@@ -500,7 +500,7 @@ cmd_update()
 
 		if test -n "$recursive"
 		then
-			(clear_local_git_env; cd "$path" && cmd_update $orig_args) ||
+			(clear_local_git_env; cd "$path" && eval cmd_update "$orig_args") ||
 			die "Failed to recurse into submodule path '$path'"
 		fi
 	done
@@ -733,7 +733,7 @@ cmd_summary() {
 cmd_status()
 {
 	# parse $args after "submodule ... status".
-	orig_args="$@"
+	orig_args=$(git rev-parse --sq-quote "$@")
 	while test $# -ne 0
 	do
 		case "$1" in
@@ -790,7 +790,7 @@ cmd_status()
 				prefix="$displaypath/"
 				clear_local_git_env
 				cd "$path" &&
-				cmd_status $orig_args
+				eval cmd_status "$orig_args"
 			) ||
 			die "Failed to recurse into submodule path '$path'"
 		fi

t/t7407-submodule-foreach.sh

@@ -238,4 +238,20 @@ test_expect_success 'use "git clone --recursive" to checkout all submodules' '
 	test -d clone4/nested1/nested2/nested3/submodule/.git
 '
 
+test_expect_success 'test "update --recursive" with a flag with spaces' '
+	git clone super "common objects" &&
+	git clone super clone5 &&
+	(
+		cd clone5 &&
+		test ! -d nested1/.git &&
+		git submodule update --init --recursive --reference="$(dirname "$PWD")/common objects" &&
+		test -d nested1/.git &&
+		test -d nested1/nested2/.git &&
+		test -d nested1/nested2/nested3/.git &&
+		test -f nested1/.git/objects/info/alternates &&
+		test -f nested1/nested2/.git/objects/info/alternates &&
+		test -f nested1/nested2/nested3/.git/objects/info/alternates
+	)
+'
+
 test_done