From 5c2bd13c3de5b4f5d36bd4e7845882ec792ac8c9 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Date: Mon, 11 Jan 2021 16:42:30 +0100
Subject: [PATCH] Add unstable nix for MN4

Fixes the fallocate problem
---
 overlay.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/overlay.nix b/overlay.nix
index 70be4db..7da73a5 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -165,6 +165,10 @@ let
     };
     # Use a slurm compatible with MN4
     slurm = bsc.slurm17;
+    # We need the unstable branch to get the fallocate problem fixed, as it is
+    # not yet in stable nix, see:
+    # https://pm.bsc.es/gitlab/rarias/bscpkgs/-/issues/83
+    nix-mn4 = self.nixUnstable;
     # Our custom version that lacks the binaries. Disabled by default.
     #rdma-core = callPackage ./bsc/rdma-core/default.nix { };