Merge pull request #5690 from reitermarkus/mkdir

Only create target directory if it doesn’t exist.

Library/Homebrew/cask/artifact/moved.rb

@@ -40,13 +40,13 @@ module Cask
         end
 
         ohai "Moving #{self.class.english_name} '#{source.basename}' to '#{target}'."
-        if target.dirname.parent.writable?
+        if target.dirname.ascend.find(&:directory?).writable?
           target.dirname.mkpath
         else
           command.run!("/bin/mkdir", args: ["-p", target.dirname], sudo: true)
         end
 
-        if target.parent.writable?
+        if target.dirname.writable?
           FileUtils.move(source, target)
         else
           command.run!("/bin/mv", args: [source, target], sudo: true)