write NBD debugging messages to logfile

abbbi · Jun 23, 2024 · 5e8db9e · 5e8db9e
1 parent 4bdea93
commit 5e8db9e
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diff --git a/Changelog b/Changelog
@@ -5,6 +5,7 @@ Version 2.11
  bindings for python do not support required features.
  * Set TLS connection options to TLS_REQUIRE instead of TLS_ALLOW which would
  fallback to non-encrypted data transfer.
+ * If LIBNBD_DEBUG is set, add NBD trace messages to logfile.
 
 Version 2.10
 ---------

diff --git a/libvirtnbdbackup/nbdcli/client.py b/libvirtnbdbackup/nbdcli/client.py
@@ -39,6 +39,13 @@ def __init__(self, cType):
         self.maxRequestSize = 33554432
         self.minRequestSize = 65536
         self.nbd = nbd.NBD()
+
+        def debug(func, args):
+            """Write NBD debugging messages to logfile instead of
+            stderr"""
+            log.debug("%s: %s", func, args)
+
+        self.nbd.set_debug_callback(debug)
         self.connection = None
 
     def _getBlockInfo(self) -> None: