packages: patch oslo-log

Due to newer packages in nixos 26.05 we need a small patch for the old
oslo-log to still work

Signed-off-by: Stefan Kober <stefan.kober@cyberus-technology.de>
On-behalf-of: SAP stefan.kober@sap.com

Author: hertrste

packages/oslo-log.nix

@@ -54,6 +54,10 @@ python3Packages.buildPythonPackage rec {
     testtools
   ];
 
+  patches = [
+    ./patches/oslo-log-pipe-mutex-context-manager.patch
+  ];
+
   checkPhase = ''
     stestr run
   '';

packages/patches/oslo-log-pipe-mutex-context-manager.patch

@@ -0,0 +1,18 @@
+diff --git a/oslo_log/pipe_mutex.py b/oslo_log/pipe_mutex.py
+index 08a1fe3..3aa4832 100644
+--- a/oslo_log/pipe_mutex.py
++++ b/oslo_log/pipe_mutex.py
+@@ -136,6 +136,13 @@ class PipeMutex:
+         # do, so nobody does it and that's okay.
+         self.close()
+ 
++    def __enter__(self):
++        self.acquire()
++        return self
++
++    def __exit__(self, exc_type, exc_value, traceback):
++        self.release()
++
+ 
+ def pipe_createLock(self):
+     """Replacement for logging.Handler.createLock method."""