stack/caucase: Enforce temporary directory usage

All data related to the instance shall be in the instance itself, and as
temporary files are crucial for caucase, force the macro user to set the
location.

stack/caucase/buildout.hash.cfg

@@ -15,4 +15,4 @@
 
 [caucase-jinja2-library]
 filename = caucase.jinja2.library
-md5sum = b8a5a93b8a7bacd6ebd4b6df24c7c828
+md5sum = 27aba89543032f3c7026ab566f3aa41b

stack/caucase/caucase.jinja2.library

@@ -4,6 +4,7 @@
   caucased_path,
   data_dir,
   netloc,
+  tmp,
   service_auto_approve_count=0,
   user_auto_approve_count=1,
   key_len=None,
@@ -18,6 +19,11 @@ mode = 0750
 [{{ prefix }}]
 recipe = slapos.cookbook:wrapper
 wrapper-path = {{ caucased_path }}
+{%- if tmp %}
+environment =
+  TMP={{ tmp }}
+  TMPDIR={{ tmp }}
+{%- endif %}
 command-line = '{{ buildout_bin_directory }}/caucased'
   --db          '${ {{- prefix }}-directory:data-dir}/caucase.sqlite'
   --server-key  '${ {{- prefix }}-directory:data-dir}/server.key.pem'