I tried to get @mediapath working for SUSE, but didn't succeed, maybe somebondy else can spot something, I was missing here:

diff --git a/app/controllers/unattended_controller.rb b/app/controllers/unattended_controller.rb
index da7eb0c..9cffe3b 100644
--- a/app/controllers/unattended_controller.rb
+++ b/app/controllers/unattended_controller.rb
@@ -236,6 +236,7 @@ class UnattendedController < ApplicationController
   end

   def yast_attributes
+    @mediapath = @host.operatingsystem.mediumpath @host
   end

   def coreos_attributes
diff --git a/app/models/operatingsystems/suse.rb b/app/models/operatingsystems/suse.rb
index 1f8487f..cfcf8f5 100644
--- a/app/models/operatingsystems/suse.rb
+++ b/app/models/operatingsystems/suse.rb
@@ -1,6 +1,11 @@
 class Suse < Operatingsystem
   PXEFILES = {:kernel => "linux", :initrd => "initrd"}

+  # Simple output of the media url
+  def mediumpath(host)
+    medium_uri(host).to_s
+  end
+
   def pxe_type
     "yast" 
   end