From 5dc0eaf3a14fd9ce8012ce898812228c47a9265b Mon Sep 17 00:00:00 2001
From: Oleksandr Usov <a.s.usov@gmail.com>
Date: Thu, 9 Oct 2025 03:08:05 +0100
Subject: [PATCH] zfs: When ZFS is calling external helper scripts (such as
 stuff from /etc/zfs/zpool.d or zfs_prepare_disk it uses reduced PATH. This
 fixes it to use NixOS system path, and not FHS.

---
 pkgs/os-specific/linux/zfs/generic.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/os-specific/linux/zfs/generic.nix b/pkgs/os-specific/linux/zfs/generic.nix
index 9513e3e7a85d..dde56cb2684f 100644
--- a/pkgs/os-specific/linux/zfs/generic.nix
+++ b/pkgs/os-specific/linux/zfs/generic.nix
@@ -152,6 +152,11 @@ let
                ]
              }"
 
+          # substitute path that ZFS will pass on when calling external helper scripts (/etc/zfs/zpool.d/*, zfs_prepare_disk)
+          substituteInPlace ./lib/libzfs/libzfs_util.c \
+            --replace-fail \"PATH=/bin:/sbin:/usr/bin:/usr/sbin\" \
+            \"PATH=/run/wrappers/bin:/run/current-system/sw/bin:/run/current-system/sw/sbin\"
+
           substituteInPlace ./config/zfs-build.m4 \
             --replace-fail "bashcompletiondir=/etc/bash_completion.d" \
               "bashcompletiondir=$out/share/bash-completion/completions"