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, 29 insertions, 0 deletions

diff --git a/tests/file_source.py b/tests/file_source.py
index 79bb234..391ca48 100644
--- a/tests/file_source.py
+++ b/tests/file_source.py
@@ -27,6 +27,7 @@ import unittest
 from . import mock
 from . import virt_bootstrap
 from . import ImageAccessor
+from . import Qcow2ImageAccessor
 from . import NOT_ROOT
 
 
@@ -76,3 +77,31 @@ class TestDirFileSource(ImageAccessor):
         self.root_password = 'my secret root password'
         self.call_bootstrap()
         self.validate_shadow_file()
+
+
+class TestQcow2FileSource(Qcow2ImageAccessor):
+    """
+    Test cases for the class FileSource used with qcow2 output format.
+    """
+
+    def call_bootstrap(self):
+        """
+        Execute the bootstrap method from virtBootstrap.
+        """
+        virt_bootstrap.bootstrap(
+            uri=self.tar_file,
+            dest=self.dest_dir,
+            fmt='qcow2',
+            progress_cb=mock.Mock(),
+            uid_map=self.uid_map,
+            gid_map=self.gid_map,
+            root_password=self.root_password
+        )
+
+    def test_qcow2_extract_rootfs(self):
+        """
+        Ensures root file system of tar archive is converted to single
+        partition qcow2 image.
+        """
+        self.call_bootstrap()
+        self.check_qcow2_images(self.get_image_path())