submodule update: silence underlying fetch with "--quiet"

Commands such as

    $ git submodule update --quiet --init --depth=1

involving shallow clones, call the shell function fetch_in_submodule, which
in turn invokes git fetch.  Pass the --quiet option onward there.

Signed-off-by: Nicholas Clark <nick@ccl4.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -420,9 +420,9 @@ fetch_in_submodule () (
 	cd "$1" &&
 	if test $# -eq 3
 	then
-		echo "$3" | git fetch --stdin ${2:+"$2"}
+		echo "$3" | git fetch ${GIT_QUIET:+--quiet} --stdin ${2:+"$2"}
 	else
-		git fetch ${2:+"$2"}
+		git fetch ${GIT_QUIET:+--quiet} ${2:+"$2"}
 	fi
 )
 

t/t7406-submodule-update.sh

@@ -1037,4 +1037,28 @@ test_expect_success 'submodule update --quiet passes quietness to merge/rebase'
 	)
 '
 
+test_expect_success 'submodule update --quiet passes quietness to fetch with a shallow clone' '
+	test_when_finished "rm -rf super4 super5 super6" &&
+	git clone . super4 &&
+	(cd super4 &&
+	 git submodule add --quiet file://"$TRASH_DIRECTORY"/submodule submodule3 &&
+	 git commit -am "setup submodule3"
+	) &&
+	(cd submodule &&
+	  test_commit line6 file
+	) &&
+	git clone super4 super5 &&
+	(cd super5 &&
+	 git submodule update --quiet --init --depth=1 submodule3 >out 2>err &&
+	 test_must_be_empty out &&
+	 test_must_be_empty err
+	) &&
+	git clone super4 super6 &&
+	(cd super6 &&
+	 git submodule update --init --depth=1 submodule3 >out 2>err &&
+	 test_file_not_empty out &&
+	 test_file_not_empty err
+	)
+'
+
 test_done