tests/storage/zfs: Updated zfs to handle both vhd and qcow2 vdi image format

Signed-off-by: Rushikesh Jadhav <rushikesh7@gmail.com>

Author: rushikeshjadhav

tests/storage/zfs/conftest.py

@@ -1,10 +1,18 @@
+from __future__ import annotations
+
 import pytest
 
 import logging
 
 # Explicitly import package-scoped fixtures (see explanation in pkgfixtures.py)
 from pkgfixtures import host_with_saved_yum_state, sr_disk_wiped
 
+from typing import TYPE_CHECKING, Generator
+
+if TYPE_CHECKING:
+    from lib.host import Host
+    from lib.sr import SR
+
 POOL_NAME = 'pool0'
 POOL_PATH = '/' + POOL_NAME
 
@@ -13,8 +21,15 @@ def host_without_zfs(host):
     assert not host.file_exists('/usr/sbin/zpool'), \
         "zfs must not be installed on the host at the beginning of the tests"
 
+# NOTE: @pytest.mark.usefixtures does not parametrize this fixture.
+# To recreate host_with_zfs for each image_format value, accept
+# image_format in the fixture arguments.
+# ref https://docs.pytest.org/en/7.1.x/how-to/fixtures.html#use-fixtures-in-classes-and-modules-with-usefixtures
 @pytest.fixture(scope='package')
-def host_with_zfs(host_without_zfs, host_with_saved_yum_state):
+def host_with_zfs(host_without_zfs: Host,
+                  host_with_saved_yum_state: Host,
+                  image_format: str
+                  ) -> Generator[Host]:
     host = host_with_saved_yum_state
     host.yum_install(['zfs'])
     host.ssh(['modprobe', 'zfs'])
@@ -28,9 +43,12 @@ def zpool_vol0(sr_disk_wiped, host_with_zfs):
     host_with_zfs.ssh(['zpool', 'destroy', POOL_NAME])
 
 @pytest.fixture(scope='package')
-def zfs_sr(host, zpool_vol0):
+def zfs_sr(host: Host, image_format: str, zpool_vol0: None) -> Generator[SR]:
     """ A ZFS SR on first host. """
-    sr = host.sr_create('zfs', "ZFS-local-SR-test", {'location': POOL_PATH})
+    sr = host.sr_create('zfs', "ZFS-local-SR-test", {
+        'location': POOL_PATH,
+        'preferred-image-formats': image_format
+    }, verify=True)
     yield sr
     # teardown
     sr.destroy()

tests/storage/zfs/test_zfs_sr.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 import logging
@@ -7,6 +9,12 @@
 from lib.common import vm_image, wait_for
 from tests.storage import vdi_is_open
 
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from lib.host import Host
+    from lib.vdi import VDI
+
 from .conftest import POOL_NAME, POOL_PATH
 
 # Requirements:
@@ -21,30 +29,46 @@ class TestZFSSRCreateDestroy:
     and VM import.
     """
 
-    def test_create_zfs_sr_without_zfs(self, host):
+    def test_create_zfs_sr_without_zfs(self, host: Host, image_format: str) -> None:
         # This test must be the first in the series in this module
         assert not host.file_exists('/usr/sbin/zpool'), \
             "zfs must not be installed on the host at the beginning of the tests"
         sr = None
         try:
-            sr = host.sr_create('zfs', "ZFS-local-SR-test", {'location': POOL_PATH})
+            sr = host.sr_create('zfs', "ZFS-local-SR-test", {
+                'location': POOL_PATH,
+                'preferred-image-formats': image_format
+            }, verify=True)
         except Exception:
             logging.info("SR creation failed, as expected.")
         if sr is not None:
             sr.destroy()
             assert False, "SR creation should not have succeeded!"
 
     @pytest.mark.usefixtures("zpool_vol0")
-    def test_create_and_destroy_sr(self, host):
+    def test_create_and_destroy_sr(self, host: Host, image_format: str) -> None:
         # Create and destroy tested in the same test to leave the host as unchanged as possible
-        sr = host.sr_create('zfs', "ZFS-local-SR-test", {'location': POOL_PATH}, verify=True)
+        sr = host.sr_create('zfs', "ZFS-local-SR-test", {
+            'location': POOL_PATH,
+            'preferred-image-formats': image_format
+        }, verify=True)
         # import a VM in order to detect vm import issues here rather than in the vm_on_xfs_fixture used in
         # the next tests, because errors in fixtures break teardown
         vm = host.import_vm(vm_image('mini-linux-x86_64-bios'), sr_uuid=sr.uuid)
         vm.destroy(verify=True)
         sr.destroy(verify=True)
 
-@pytest.mark.usefixtures("zpool_vol0")
+# We want to skip class tests for qcow2 if the SM does not support qcow2
+@pytest.fixture(scope="class")
+def for_qcow2_vdi_image_format(vdi_on_zfs_sr: VDI, image_format: str):
+    # only check qcow2-specific behavior
+    if image_format != "qcow2":
+        return
+    # feature-detect: if the SM doesn't report image-format, skip this check
+    if not vdi_on_zfs_sr.get_image_format():
+        pytest.skip("SM does not report sm-config:image-format; skipping qcow2 format check")
+
+@pytest.mark.usefixtures("for_qcow2_vdi_image_format", "zpool_vol0")
 class TestZFSSR:
     @pytest.mark.quicktest
     def test_quicktest(self, zfs_sr):