faster chown in slapos format

slapos/util.py

@@ -2,6 +2,7 @@
 
 import errno
 import os
+import subprocess
 
 
 def mkdir_p(path, mode=0o700):
@@ -21,6 +22,12 @@ def mkdir_p(path, mode=0o700):
 
 
 def chownDirectory(path, uid, gid):
+  chown_cmd = '/bin/chown'
+  if os.path.exists(chown_cmd):
+    subprocess.check_call([chown_cmd, '-R', '%s:%s' % (uid, gid), path])
+  else:
+    # slow fallback.. not unix?
+    print 'chown..', path
     os.chown(path, uid, gid)
     for root, dirs, files in os.walk(path):
         for items in dirs, files: