qemu.tests: Add case for qemu-img compare

Signed-off-by: NPing Li <pingl@redhat.com>

qemu/tests/cfg/qemu_disk_img_compare.cfg

+- qemu_disk_img_compare:
+    virt_test_type = qemu
+    type = qemu_disk_img_convert
+    kill_vm = yes
+    kill_vm_before_test = yes
+    start_vm = no
+    image_size = 20G
+    force_create_image = no
+    backup_image_before_testing = yes
+    restore_image_before_testing = yes
+    option_verified = "format"
+    image_convert = "image1"
+    convert_name_image1 = "images/image1_to_raw"
+    convert_format_image1 = "raw"
+    compare_mode_list = "default strict"
+    md5sum_bin = "md5sum"
+    tmp_dir = /var/tmp
+    tmp_file_name = ${tmp_dir}/test.img
+    file_create_cmd = "dd if=/dev/urandom of=%s bs=4k count=250"
+    Windows:
+        guest_file_name = "c:\test.img"
+        x86_64:
+            sync_bin = WIN_UTILS:\Sync\sync64.exe /accepteula
+        i386, i686:
+            sync_bin = WIN_UTILS:\Sync\sync.exe /accepteula
+    Linux:
+        guest_file_name = "${tmp_dir}/test.img"

qemu/tests/qemu_disk_img_convert.py

@@ -4,6 +4,9 @@ from autotest.client import utils
 from autotest.client.shared import error
 
 from virttest import storage
+from virttest import error_context
+
+from avocado.core import exceptions
 
 from qemu.tests import qemu_disk_img
 
@@ -33,6 +36,28 @@ class ConvertTest(qemu_disk_img.QemuImgTest):
         self.trash.append(converted)
         return params
 
+    @error_context.context_aware
+    def compare_test(self, t_params):
+        """
+        Compare images.
+
+        :param t_params: Dictionary with the test parameters
+        """
+        for mode in t_params.objects("compare_mode_list"):
+            error_context.context("Compare images in %s mode" % mode,
+                                  logging.info)
+            cmd_result = None
+            is_strict = ("strict" == mode)
+            image1 = self.image_filename
+            image2 = storage.get_image_filename(t_params, self.data_dir)
+            try:
+                cmd_result = self.compare_images(image1, image2, is_strict)
+            except (exceptions.TestFail, exceptions.TestError), detail:
+                if not is_strict:
+                    raise
+            if is_strict and cmd_result:
+                raise error.TestFail("images are identical in strict mode")
+
 
 def run(test, params, env):
     """
@@ -58,6 +83,7 @@ def run(test, params, env):
         raise error.TestError("Fail to save tmp file")
     convert_test.destroy_vm()
     n_params = convert_test.convert()
+    convert_test.compare_test(n_params)
     convert_test.verify_info(n_params)
     convert_test.start_vm(n_params)