From 591bd78509eb667d237d2be60ea33df11ab5468d Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Mon, 26 Jun 2023 20:49:43 +0100
Subject: [PATCH] extract writeKconfig to its own file

---
 pkgs/kernel/default.nix       | 13 ++++---------
 pkgs/kernel/write-kconfig.nix | 11 +++++++++++
 2 files changed, 15 insertions(+), 9 deletions(-)
 create mode 100644 pkgs/kernel/write-kconfig.nix

diff --git a/pkgs/kernel/default.nix b/pkgs/kernel/default.nix
index bda49bf6..0d697925 100644
--- a/pkgs/kernel/default.nix
+++ b/pkgs/kernel/default.nix
@@ -8,15 +8,10 @@
  , src
  , extraPatchPhase ? "echo"
 } :
-let writeConfig = name : config: writeText name
-        (builtins.concatStringsSep
-          "\n"
-          (lib.mapAttrsToList
-            (name: value: (if value == "n" then "# CONFIG_${name} is not set" else "CONFIG_${name}=${value}"))
-            config
-          ));
-    kconfigFile = writeConfig "kconfig" config;
-    inherit lib; in
+let
+  writeConfig = import ./write-kconfig.nix { inherit lib writeText; };
+  kconfigFile = writeConfig "kconfig" config;
+  inherit lib; in
 stdenv.mkDerivation rec {
   name = "kernel";
   inherit src extraPatchPhase;
diff --git a/pkgs/kernel/write-kconfig.nix b/pkgs/kernel/write-kconfig.nix
new file mode 100644
index 00000000..7d064b29
--- /dev/null
+++ b/pkgs/kernel/write-kconfig.nix
@@ -0,0 +1,11 @@
+{
+  lib
+, writeText
+}:
+name : config: writeText name
+  (builtins.concatStringsSep
+    "\n"
+    (lib.mapAttrsToList
+      (name: value: (if value == "n" then "# CONFIG_${name} is not set" else "CONFIG_${name}=${value}"))
+      config
+    ))