[PATCH 2/2] qemu-iotests: Test convert to qcow2 compressed to NBD

[Nir Soffer <nirsof@gmail.com>]

Add test for "qemu-img convert -O qcow2 -c" to NBD target. The use case
is writing compressed disk content to OVA archive.

Signed-off-by: Nir Soffer <nsoffer@redhat.com>
---
 tests/qemu-iotests/302     | 83 ++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/302.out | 27 +++++++++++++
 tests/qemu-iotests/group   |  1 +
 3 files changed, 111 insertions(+)
 create mode 100755 tests/qemu-iotests/302
 create mode 100644 tests/qemu-iotests/302.out

diff --git a/tests/qemu-iotests/302 b/tests/qemu-iotests/302
new file mode 100755
index 0000000000..cefde1f7cf
--- /dev/null
+++ b/tests/qemu-iotests/302
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+#
+# Tests conveting qcow2 compressed to NBD
+#
+# Copyright (c) 2020 Nir Soffer <nirsof@gmail.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# owner=nirsof@gmail.com
+
+import json
+import iotests
+
+from iotests import (
+    file_path,
+    qemu_img,
+    qemu_img_create,
+    qemu_img_log,
+    qemu_img_pipe,
+    qemu_io,
+    qemu_nbd,
+)
+
+iotests.script_initialize(supported_fmts=["qcow2"])
+
+# Create source disk, format does not matter.
+src_disk = file_path("disk.img")
+qemu_img_create("-f", "raw", src_disk, "10m")
+qemu_io("-f", "raw", "-c", "write 1m 64K", src_disk)
+
+# The use case is writing qcow2 image directly into a tar file. Code to create
+# real tar file not included.
+#
+# offset    content
+# -------------------------------
+#      0    first memebr header
+#    512    first member data
+#   1024    second memeber header
+#   1536    second member data
+
+tar_file = file_path("test.tar")
+out = qemu_img_pipe("measure", "-O", "qcow2", "--output", "json", src_disk)
+measure = json.loads(out)
+qemu_img_create("-f", "raw", tar_file, str(measure["required"]))
+
+nbd_sock = file_path("nbd-sock", base_dir=iotests.sock_dir)
+nbd_uri = "nbd+unix:///exp?socket=" + nbd_sock
+
+# Use raw format to allow creating qcow2 directy into tar file.
+qemu_nbd(
+    "--socket", nbd_sock,
+    "--persistent",
+    "--export-name", "exp",
+    "--format", "raw",
+    "--offset", "1536",
+    tar_file)
+
+iotests.log("=== Target image info ===")
+qemu_img_log("info", nbd_uri)
+
+# Write image into the tar file. In a real applicatio we would write a tar
+# entry after writing the image.
+qemu_img("convert", "-f", "raw", "-O", "qcow2", "-c", src_disk, nbd_uri)
+
+iotests.log("=== Converted image info ===")
+qemu_img_log("info", nbd_uri)
+
+iotests.log("=== Converted image check ===")
+qemu_img_log("check", nbd_uri)
+
+iotests.log("=== Comparing to source disk ===")
+qemu_img_log("compare", src_disk, nbd_uri)
diff --git a/tests/qemu-iotests/302.out b/tests/qemu-iotests/302.out
new file mode 100644
index 0000000000..babef3d574
--- /dev/null
+++ b/tests/qemu-iotests/302.out
@@ -0,0 +1,27 @@
+=== Target image info ===
+image: nbd+unix:///exp?socket=SOCK_DIR/PID-nbd-sock
+file format: raw
+virtual size: 446 KiB (457216 bytes)
+disk size: unavailable
+
+=== Converted image info ===
+image: nbd+unix:///exp?socket=SOCK_DIR/PID-nbd-sock
+file format: qcow2
+virtual size: 10 MiB (10485760 bytes)
+disk size: unavailable
+cluster_size: 65536
+Format specific information:
+    compat: 1.1
+    compression type: zlib
+    lazy refcounts: false
+    refcount bits: 16
+    corrupt: false
+
+=== Converted image check ===
+No errors were found on the image.
+1/160 = 0.62% allocated, 100.00% fragmented, 100.00% compressed clusters
+Image end offset: 393216
+
+=== Comparing to source disk ===
+Images are identical.
+
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 1d0252e1f0..1e1cb27bc8 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -308,3 +308,4 @@
 297 meta
 299 auto quick
 301 backing quick
+302 quick
-- 
2.25.4