kvm: drop collective.recipe.shelloutput and use slapos.recipe.build

software/kvm/buildout.hash.cfg

@@ -47,7 +47,7 @@ md5sum = b617d64de73de1eed518185f310bbc82
 
 [template-nbd]
 filename = instance-nbd.cfg.jinja2
-md5sum = 003112c44ef8d536861a46e3dfc67a37
+md5sum = 90a0d4d79601fc1a2f7ea870d6439fc5
 
 [template-ansible-promise]
 filename = template/ansible-promise.in

software/kvm/instance-nbd.cfg.jinja2

@@ -80,6 +80,10 @@ upload_key = ${onetimeupload-instance:key}
 status_message = ${detect-if-cdrom-present:status}
 
 [detect-if-cdrom-present]
-recipe = collective.recipe.shelloutput
-commands =
-  status = [ -f ${onetimeupload-instance:image-path} ] && echo "image already uploaded, you can't upload it again" || echo "WARNING: no image yet, the NBD server doesn't work"
+recipe = slapos.recipe.build
+init =
+  import os
+  options['status'] = (
+    "image already uploaded, you can't upload it again"
+    if os.path.isfile("${onetimeupload-instance:image-path}")
+    else "WARNING: no image yet, the NBD server doesn't work")