software/re6stnet: fix restart of registry

this is a fixup of 54a08186

software/re6stnet/buildout.hash.cfg

@@ -18,7 +18,7 @@ md5sum = 7be0c21751f8385ef876c3d7192d4057
 
 [template-re6stnet]
 filename = instance-re6stnet.cfg.in
-md5sum = 01a24f1983a1d40f31c4b36b7a2448fe
+md5sum = 6936c2d6c9e5dc707da761caf6d977af
 
 [template-apache-conf]
 filename = apache.conf.in

software/re6stnet/instance-re6stnet.cfg.in

@@ -96,7 +96,20 @@ inline =
 output = ${re6stnet-dirs:conf}/community.conf
 {%- endif %}
 
+[re6st-registry-conf-init]
+recipe = slapos.recipe.build
+init =
+  # pre-create a file at the path of the conf,
+  # so that we can use hash-existing-files options
+  import os
+  conf_file = self.buildout['re6st-registry-conf']['output']
+  if not os.path.exists(os.path.dirname(conf_file)):
+    os.makedirs(os.path.dirname(conf_file))
+  if not os.path.exists(conf_file):
+    open(conf_file, 'a').close()
+
 [re6st-registry-conf]
+init = ${re6st-registry-conf-init:init}
 recipe = slapos.recipe.template:jinja2
 url = {{ parameter_dict['template-re6st-registry-conf'] }}
 output = ${re6stnet-dirs:conf}/registry.conf