Merge branch 'td/submodule-update-quiet'

"git submodule update --quiet" did not squelch underlying "rebase"
and "pull" commands.

* td/submodule-update-quiet:
  submodule update: silence underlying merge/rebase with "--quiet"

git-submodule.sh

@@ -440,7 +440,7 @@ cmd_update()
 			GIT_QUIET=1
 			;;
 		-v)
-			GIT_QUIET=0
+			unset GIT_QUIET
 			;;
 		--progress)
 			progress=1
@@ -614,13 +614,13 @@ cmd_update()
 				say_msg="$(eval_gettext "Submodule path '\$displaypath': checked out '\$sha1'")"
 				;;
 			rebase)
-				command="git rebase"
+				command="git rebase ${GIT_QUIET:+--quiet}"
 				die_msg="$(eval_gettext "Unable to rebase '\$sha1' in submodule path '\$displaypath'")"
 				say_msg="$(eval_gettext "Submodule path '\$displaypath': rebased into '\$sha1'")"
 				must_die_on_failure=yes
 				;;
 			merge)
-				command="git merge"
+				command="git merge ${GIT_QUIET:+--quiet}"
 				die_msg="$(eval_gettext "Unable to merge '\$sha1' in submodule path '\$displaypath'")"
 				say_msg="$(eval_gettext "Submodule path '\$displaypath': merged in '\$sha1'")"
 				must_die_on_failure=yes

t/t7406-submodule-update.sh

@@ -1022,4 +1022,16 @@ test_expect_success 'git clone passes the parallel jobs config on to submodules'
 	rm -rf super4
 '
 
+test_expect_success 'submodule update --quiet passes quietness to merge/rebase' '
+	(cd super &&
+	 test_commit -C rebasing message &&
+	 git submodule update --rebase --quiet >out 2>err &&
+	 test_must_be_empty out &&
+	 test_must_be_empty err &&
+	 git submodule update --rebase -v >out 2>err &&
+	 test_file_not_empty out &&
+	 test_must_be_empty err
+	)
+'
+
 test_done