Add new bundle_volume module

This is not yet workable but it will host the code for creating
images out of a running system.

image_creator/bundle_volume.py

+# Copyright 2012 GRNET S.A. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or
+# without modification, are permitted provided that the following
+# conditions are met:
+#
+#   1. Redistributions of source code must retain the above
+#      copyright notice, this list of conditions and the following
+#      disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above
+#      copyright notice, this list of conditions and the following
+#      disclaimer in the documentation and/or other materials
+#      provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
+# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+# The views and conclusions contained in the software and
+# documentation are those of the authors and should not be
+# interpreted as representing official policies, either expressed
+# or implied, of GRNET S.A.
+
+from image_creator.util import FatalError
+
+def bundle_volume():
+    raise FatalError("Creating an image out of a running system is not yet "
+        "supported.")
+
+# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :

image_creator/disk.py

@@ -34,6 +34,7 @@
 from image_creator.util import get_command
 from image_creator.util import FatalError
 from image_creator.gpt import GPTPartitionTable
+from image_creator.bundle_volume import bundle_volume
 import stat
 import os
 import tempfile
@@ -77,8 +78,9 @@ class Disk(object):
         return loop
 
     def _dir_to_disk(self):
-        raise FatalError("Using a directory as media source is not supported "
-                         "yet!")
+        if self.source == '/':
+            return bundle_volume()
+        raise FatalError("Using a directory as media source is supported")
 
     def cleanup(self):
         """Cleanup internal data. This needs to be called before the