libnvme/tests: add example discovery script

Add an example script on how to do a nvme discovery via the python
bindings.

Signed-off-by: Hannes Reinecke <[email protected]>

Author: hreinecke

libnvme/tests/discovery.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: LGPL-2.1-or-later
+import sys
+import pprint
+from libnvme import nvme
+
+root = nvme.root()
+root.log_level('debug')
+
+host = nvme.host(root)
+subsysnqn = nvme.NVME_DISC_SUBSYS_NAME
+transport = 'tcp'
+traddr    = '127.0.0.1'
+trsvcid   = '4420'
+
+
+ctrl = nvme.ctrl(root, subsysnqn=subsysnqn, transport=transport, traddr=traddr, trsvcid=trsvcid)
+
+try:
+    ctrl.connect(host)
+except Exception as e:
+    sys.exit(f'Failed to connect: {e}')
+
+print(f'connected to {ctrl.name}')
+    
+try:
+    disc_log = ctrl.discover();
+except Exception as e:
+    print(f'Failed to retrieve discovery log: {e}')
+    disc_log = []
+    pass
+
+for dlpe in disc_log:
+    print(f'log entry {dlpe["portid"]}: {dlpe["subtype"]} {dlpe["subnqn"]}')
+
+try:
+    ctrl.disconnect()
+except Exception as e:
+    sys.exit(f'Failed to disconnect: {e}')
+
+for s in host.subsystems():
+    for c in s.controllers():
+        print(f'{s}: {c.name}')