AwesomeでVarietyで設定した壁紙へのシンボリックリンクを作成するにはどうすればよいですか？

Awesome Window Manager で Variety Wallpaper Changer の set_wallpaper スクリプトを変更して、~/.cache/current_wallpaper新しく設定された壁紙イメージへのシンボリックリンクを作成するにはどうすればよいですか?

# Awesome Window Manager
# Be sure to start variety when you start awesome, such as by adding it to ~/.xinitrc
# NOTE: This config will change the wallpaper after your current awesome theme sets it.
# As such, the theme's wallpaper will briefly appear before being replaced with Variety's wallpaper.
if [[ "$XDG_SESSION_DESKTOP $DESKTOP_STARTUP_ID $DESKTOP_SESSION $XDG_CURRENT_DESKTOP" == *"awesome"* ]]; then
    echo "for s in screen do require(\"gears\").wallpaper.maximized(\"$1\", s) end" | awesome-client
fi