improve version and mirror updating

version

@@ -124,3 +124,11 @@ echo "CoreDesktop  $version"
 echo "Kernel       $kernel"
 [ -n "$driver" ] && echo "Video driver $driver"
 echo "Last update  $last_update"
+
+# Packages newer than the mirror's last sync aren't shown above, or installed
+if age="$(mirror_age_hours)" && (( age >= MIRROR_STALE_HOURS )); then
+  if (( age >= 48 )); then ago="$(( age / 24 )) days"; else ago="$age hours"; fi
+  echo
+  echo -e "\e[33mYour package mirror ($(first_mirror)) last synced with Arch $ago ago, so"
+  echo -e "newer packages may be missing. Run update to switch to up-to-date mirrors.\e[0m"
+fi