Use temporary extends-cache during software setup.

CHANGES.txt

 0.5 (unreleased)
 ================
 
- * No changes yet.
+ * slapgrid: Use temporary extends-cache directory in order to make faster
+   remote profile refresh. [Łukasz Nowak]
 
 0.4 (2011-06-24)
 ================

slapos/grid/SlapObject.py

@@ -29,7 +29,9 @@ import os
 import shutil
 import subprocess
 import pkg_resources
+import shutil
 import stat
+import tempfile
 from supervisor import xmlrpc
 import xmlrpclib
 import pwd
@@ -72,7 +74,10 @@ class Software(object):
              root_stat_info.st_gid != path_stat_info.st_gid:
             os.chown(path, root_stat_info.st_uid,
                 root_stat_info.st_gid)
+    extends_cache = tempfile.mkdtemp()
+    try:
       buildout_parameter_list = [
+        'buildout:extends-cache=%s' % extends_cache,
         'buildout:directory=%s' % self.software_path,
         '-c', self.url]
       bootstrapBuildout(self.software_path, self.buildout,
@@ -82,6 +87,8 @@ class Software(object):
                      os.path.join(self.software_path, 'bin', 'buildout'),
                      additional_buildout_parametr_list=buildout_parameter_list,
                      console=self.console)
+    finally:
+      shutil.rmtree(extends_cache)
 
   def remove(self):
     """Removes the part that was installed.