component/ceph: allow changes of python version

component/ceph/buildout.cfg

@@ -35,6 +35,11 @@ recipe = slapos.recipe.build
 shared = true
 pyyaml = ${pyyaml-download:target}
 pyaml = ${pyaml-download:target}
+init =
+  # add the python executable in the options dict so that
+  # buildout signature changes if python executable changes
+  import sys
+  options['python-executable'] = sys.executable
 
 install =
   import os, sys