hooks/xdelta: use silent output; those warnings are too noisy.

common/hooks/post-pkg/01-xdelta_repolist.sh

@@ -1,4 +1,4 @@
-# This hook generates vcdiffs
+# This hook generates vcdiffs for repository data.
 
 hook() {
 	type -P xdelta3 > /dev/null || return 0
@@ -9,20 +9,18 @@ hook() {
 
 			if ! cmp -s "${newfile}" "${oldfile}"; then
 				newdiff="${newfile}.${chk}.vcdiff"
-				xdelta3 -f -e -s "${oldfile}" "${newfile}" "${newdiff}"
+				xdelta3 -q -f -e -s "${oldfile}" "${newfile}" "${newdiff}"
 				for diff in ${newfile}.*.vcdiff; do
 					[ "${diff}" = "${newdiff}" ] && continue;
 					cp -- "${diff}" "${diff}.tmp"
-					xdelta3 -f merge -m "${diff}.tmp" "${newdiff}" "${diff}"
+					xdelta3 -q -f merge -m "${diff}.tmp" "${newdiff}" "${diff}"
 					rm -- "${diff}.tmp"
 				done
 			fi
 
 			# generate an empty diff to the new file
 			newchk=`sha256sum ${newfile} | awk '{ print $1 }'`
-			xdelta3 -f -e -s "${newfile}" "${newfile}" \
-				"${newfile}.${newchk}.vcdiff"
-
+			xdelta3 -q -f -e -s "${newfile}" "${newfile}" "${newfile}.${newchk}.vcdiff"
 			rm -- "${oldfile}"
 		done
 }