Create qcow2 images with guestfs-python

Use the python bindings of libguestfs to create qcow2 image with
backing chains to mimic the layers of container image.

This commit also changes the behavior of FileSource when 'qcow2'
output format is used. Now the string layer-0.qcow2 will be used
as name of the output file.

This change is applied in the test suite as an update to the function
get_image_path().

1 files changed, 8 insertions, 6 deletions

diff --git a/src/virtBootstrap/sources/file_source.py b/src/virtBootstrap/sources/file_source.py
index 412db8a..69f024c 100644
--- a/src/virtBootstrap/sources/file_source.py
+++ b/src/virtBootstrap/sources/file_source.py
@@ -64,14 +64,16 @@ class FileSource(object):
             utils.untar_layers(layer, dest, self.progress)
 
         elif self.output_format == 'qcow2':
-            # Remove the old path
-            file_name = os.path.basename(self.path)
-            qcow2_file = os.path.realpath('{}/{}.qcow2'.format(dest,
-                                                               file_name))
-
             self.progress("Extracting files into qcow2 image", value=0,
                           logger=logger)
-            utils.create_qcow2(self.path, qcow2_file)
+
+            img = utils.BuildImage(
+                layers=layer,
+                dest=dest,
+                progress=self.progress
+            )
+            img.create_base_layer()
+
         else:
             raise Exception("Unknown format:" + self.output_format)