disk path

disk.py

@@ -194,18 +194,23 @@ class Disk(object):
         return False
 
     def create_ci_disk(self, meta_data, user_data):
-        disk_path = self.get_path()
-        logger.info("Create CI iso to %s", disk_path)
-        with open(self.dir + '/meta-data', 'w') as f:
+        tmp_dir = self.dir + '/dir' + self.name
+        os.mkdir(tmp_dir)
+        meta_path = tmp_dir + '/meta-data'
+        user_path = tmp_dir + '/user-data'
+        with open(meta_path, 'w') as f:
             f.write(meta_data)
-        with open(self.dir + '/user-data', 'w') as f:
+        with open(user_path, 'w') as f:
             f.write(user_data)
         cmdline = ['genisoimage',
                    '-output', self.get_path(),
                    '-V', 'cidata', '-r', '-J',
-                   self.dir + '/meta-data',
-                   self.dir + '/user-data']
+                   meta_path,
+                   user_path]
         subprocess.check_output(cmdline)
+        os.remove(meta_path)
+        os.remove(user_path)
+        os.removedirs(tmp_dir)
         self.size = Disk.get(self.dir, self.name).size