From e4d10fa807bb6cb3e0b5f423d561bb2d9f60a072 Mon Sep 17 00:00:00 2001
From: qbisi <qbisicwate@gmail.com>
Date: Sun, 13 Apr 2025 22:30:24 +0800
Subject: [PATCH] mpiCheckPhaseHook: change HYDRA_IFACE to lo0 on Darwin
 platform

---
 pkgs/by-name/mp/mpiCheckPhaseHook/mpi-check-hook.sh | 2 +-
 pkgs/by-name/mp/mpiCheckPhaseHook/package.nix       | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/by-name/mp/mpiCheckPhaseHook/mpi-check-hook.sh b/pkgs/by-name/mp/mpiCheckPhaseHook/mpi-check-hook.sh
index 6adad2b44076..77d7290e2ec1 100644
--- a/pkgs/by-name/mp/mpiCheckPhaseHook/mpi-check-hook.sh
+++ b/pkgs/by-name/mp/mpiCheckPhaseHook/mpi-check-hook.sh
@@ -61,7 +61,7 @@ setupMpiCheck() {
       ;;
     MPICH)
       # Fix to make mpich run in a sandbox
-      export HYDRA_IFACE=lo
+      export HYDRA_IFACE="@iface@"
       # Disable sysfs cpu topology directory discovery.
       export HWLOC_XMLFILE="@topology@"
       ;;
diff --git a/pkgs/by-name/mp/mpiCheckPhaseHook/package.nix b/pkgs/by-name/mp/mpiCheckPhaseHook/package.nix
index a49e8e338bea..c771e87376fa 100644
--- a/pkgs/by-name/mp/mpiCheckPhaseHook/package.nix
+++ b/pkgs/by-name/mp/mpiCheckPhaseHook/package.nix
@@ -1,9 +1,14 @@
-{ callPackage, makeSetupHook }:
+{
+  callPackage,
+  makeSetupHook,
+  stdenv,
+}:
 
 makeSetupHook {
   name = "mpi-checkPhase-hook";
 
   substitutions = {
+    iface = if stdenv.hostPlatform.isDarwin then "lo0" else "lo";
     topology = ./topology.xml;
   };
 } ./mpi-check-hook.sh