Add nbdssl support

tests/integration/test_openvixdisklib.py

@@ -3,13 +3,17 @@
 
 """Exercise the VDDK-compatible openvixdisklib handle against the lab."""
 
+import pytest
+
 from openvixdisklib import openvixdisklib as vixdisklib
 from tests.integration.base import (
     LabEnv, SECTOR_AT_1GB, SECTOR_SIZE, pattern_bytes)
 
 
 class TestOpenvixdisklib:
-    def test_write_and_read_sector_zero_and_one_gib(self, lab: LabEnv) -> None:
+    @pytest.mark.parametrize("transport_mode", ["nbdssl", "nbd"])
+    def test_write_and_read_sector_zero_and_one_gib(
+            self, lab: LabEnv, transport_mode: str) -> None:
         """Write then read sector 0 and the sector at a 1 GiB offset."""
         handle = vixdisklib.VixDiskLibHandle(
             vixdisklib_compatibility_version="8.0",
@@ -18,13 +22,16 @@ class TestOpenvixdisklib:
         read_buf = vixdisklib.get_buffer(SECTOR_SIZE)
         connect_kwargs = lab.vixdisklib_connect_kwargs({
             "allow_untrusted": lab.allow_untrusted,
+            "transport_modes": transport_mode,
         })
         patterns = {
             0: pattern_bytes(SECTOR_SIZE, b"OVDL-S0"),
             SECTOR_AT_1GB: pattern_bytes(SECTOR_SIZE, b"OVDL-1GB"),
         }
+        assert handle.get_transport_modes() == ["nbdssl", "nbd"]
         with handle.connect(**connect_kwargs) as conn:
             with handle.open(conn, lab.disk_path, flags=0) as disk:
+                assert handle.get_transport_mode(disk) == transport_mode
                 for start, expected in patterns.items():
                     write_buf[:SECTOR_SIZE] = expected
                     handle.write(disk, start, 1, write_buf)