openmpi: Fix upstream issue with shared memory backing file creation (#378844)

pkgs/by-name/op/openmpi/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchurl,
+  fetchpatch,
   removeReferencesTo,
   gfortran,
   perl,
@@ -47,6 +48,17 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-vUGD/LxDR3wlR5m0Kd8abldsBC50otL4s31Tey/5gVc=";
   };
 
+  patches = [
+    # This patch can be removed with the next openmpi update (>5.0.6)
+    # See https://github.com/open-mpi/ompi/issues/12784 and https://github.com/open-mpi/ompi/pull/13003
+    # Fixes issue where the shared memory backing file cannot be created because directory trees are never created
+    (fetchpatch {
+      name = "fix-singletons-session-dir";
+      url = "https://github.com/open-mpi/ompi/commit/4d4f7212decd0d0ca719688b15dc9b3ee7553a52.patch";
+      hash = "sha256-Mb8qXtAUhAQ90v0SdL24BoTASsKRq2Gu8nYqoeSc9DI=";
+    })
+  ];
+
   postPatch = ''
     patchShebangs ./