zfs-vol: add a test for VDI resize

Signed-off-by: Yann Dirson <[email protected]>

lib/vdi.py

@@ -7,6 +7,10 @@ def __init__(self, sr, uuid, snapshot_of=None):
         # TODO: use a different approach when migration is possible
         self.sr = sr
 
+    def resize(self, size):
+        return self.sr.pool.master.xe('vdi-resize', {'uuid': self.uuid,
+                                                     'disk-size': str(size)})
+
     def snapshot(self):
         logging.info(f"Create snapshot of {self}")
         return VDI(self.sr,

tests/storage/zfsvol/test_zfsvol_sr.py

@@ -30,6 +30,20 @@ def test_create_and_destroy_sr(self, host, sr_disk_wiped):
 
 @pytest.mark.usefixtures("zfsvol_sr")
 class TestZfsvolSrBasics:
+    def test_vdi_resize(self, vdi_on_zfsvol_sr):
+        logging.info("Resize up")
+        vdi_on_zfsvol_sr.resize(1024 * 1024)
+        logging.info("Attempt to resize down")
+        try:
+            vdi_on_zfsvol_sr.resize(64 * 1024)
+        except Exception as e:
+            if "shrinking not allowed" in str(e):
+                # properly refused
+                pass
+            else:
+                logging.error("unexpected error on downsize attempt: %s", e)
+                raise
+
     @pytest.mark.xfail # needs support for cloning non-snapshots
     def test_vdi_clone(self, vdi_on_zfsvol_sr):
         clone = vdi_on_zfsvol_sr.clone()