From 8b7658bfa57bcc361bdb7d79c80f9cf0bde62db0 Mon Sep 17 00:00:00 2001
From: beviu <contact@beviu.com>
Date: Wed, 15 Apr 2026 15:45:27 +0200
Subject: [PATCH 1/2] installer/nixos-generate-config: use lib.getExe

---
 nixos/modules/installer/tools/tools.nix | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/nixos/modules/installer/tools/tools.nix b/nixos/modules/installer/tools/tools.nix
index 086d8971d466..f3f60dfbdd49 100644
--- a/nixos/modules/installer/tools/tools.nix
+++ b/nixos/modules/installer/tools/tools.nix
@@ -30,15 +30,15 @@ let
     name = "nixos-generate-config";
     src = ./nixos-generate-config.pl;
     replacements = {
-      perl = "${
+      perl = lib.getExe (
         pkgs.perl.withPackages (p: [
           p.FileSlurp
           p.ConfigIniFiles
         ])
-      }/bin/perl";
+      );
       hostPlatformSystem = pkgs.stdenv.hostPlatform.system;
-      detectvirt = "${config.systemd.package}/bin/systemd-detect-virt";
-      btrfs = "${pkgs.btrfs-progs}/bin/btrfs";
+      detectvirt = lib.getExe' config.systemd.package "systemd-detect-virt";
+      btrfs = lib.getExe pkgs.btrfs-progs;
       inherit (config.system.nixos-generate-config) configuration desktopConfiguration flake;
       xserverEnabled = config.services.xserver.enable;
     };

From 623ec633ba806be11031a0cd1760649edd9d5c3a Mon Sep 17 00:00:00 2001
From: beviu <contact@beviu.com>
Date: Wed, 15 Apr 2026 16:07:29 +0200
Subject: [PATCH 2/2] nixos-generate-config: substitute bcachefs

For systems where the package is marked as broken, use `false` instead.
The Perl script checks for a non-zero exit status, so it will handle it
as if the command failed.
---
 nixos/modules/installer/tools/nixos-generate-config.pl | 2 +-
 nixos/modules/installer/tools/tools.nix                | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/installer/tools/nixos-generate-config.pl b/nixos/modules/installer/tools/nixos-generate-config.pl
index 3d0f4a9f7d86..96d0d68e5c93 100644
--- a/nixos/modules/installer/tools/nixos-generate-config.pl
+++ b/nixos/modules/installer/tools/nixos-generate-config.pl
@@ -505,7 +505,7 @@ EOF
     # This should work for single and multi-device systems.
     # still needs subvolume support
     if ($fsType eq "bcachefs") {
-        my ($status, @info) = runCommand("bcachefs fs usage $rootDir$mountPoint");
+        my ($status, @info) = runCommand("@bcachefs@ fs usage $rootDir$mountPoint");
         my $UUID = $info[0];
 
         if ($status == 0 && $UUID =~ /^Filesystem:[ \t\n]*([0-9a-z-]+)/) {
diff --git a/nixos/modules/installer/tools/tools.nix b/nixos/modules/installer/tools/tools.nix
index f3f60dfbdd49..6ce3e2839371 100644
--- a/nixos/modules/installer/tools/tools.nix
+++ b/nixos/modules/installer/tools/tools.nix
@@ -38,6 +38,11 @@ let
       );
       hostPlatformSystem = pkgs.stdenv.hostPlatform.system;
       detectvirt = lib.getExe' config.systemd.package "systemd-detect-virt";
+      bcachefs =
+        if pkgs.bcachefs-tools.meta.broken then
+          lib.getExe' pkgs.coreutils "false"
+        else
+          lib.getExe pkgs.bcachefs-tools;
       btrfs = lib.getExe pkgs.btrfs-progs;
       inherit (config.system.nixos-generate-config) configuration desktopConfiguration flake;
       xserverEnabled = config.services.xserver.enable;