From 9c9848be544fc20f80b2fdcb5aeb0bb12c23fbe5 Mon Sep 17 00:00:00 2001
From: dramforever <dramforever@live.com>
Date: Fri, 19 Sep 2025 14:49:25 +0800
Subject: [PATCH] linuxManualConfig: Handle only y and m in readConfig

Parsing Linux config files in Nix in full is complicated, primarily due
to string values. Currently, the regular expression used is fragile and
breaks with string values containing equal signs or (escaped) quotes.

The primary use of these options is system.requiredKernelConfig, which
only really needs to track "yes" and "module". Therefore, only parse
those.

This is a breaking change. However, this is a very obscure corner of
linuxManualConfig and should have few if any affected users.
---
 .../linux/kernel/manual-config.nix            | 30 ++++++++-----------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/pkgs/os-specific/linux/kernel/manual-config.nix b/pkgs/os-specific/linux/kernel/manual-config.nix
index 41d23aa13240..cd207f1d610c 100644
--- a/pkgs/os-specific/linux/kernel/manual-config.nix
+++ b/pkgs/os-specific/linux/kernel/manual-config.nix
@@ -32,24 +32,18 @@ let
 
   readConfig =
     configfile:
-    lib.listToAttrs (
-      map
-        (
-          line:
-          let
-            match = lib.match "(.*)=\"?(.*)\"?" line;
-          in
-          {
-            name = lib.elemAt match 0;
-            value = lib.elemAt match 1;
-          }
-        )
-        (
-          lib.filter (line: !(lib.hasPrefix "#" line || line == "")) (
-            lib.splitString "\n" (builtins.readFile configfile)
-          )
-        )
-    );
+    let
+      matchLine =
+        line:
+        let
+          match = lib.match "(CONFIG_[^=]+)=([ym])" line;
+        in
+        lib.optional (match != null) {
+          name = lib.elemAt match 0;
+          value = lib.elemAt match 1;
+        };
+    in
+    lib.listToAttrs (lib.concatMap matchLine (lib.splitString "\n" (builtins.readFile configfile)));
 in
 lib.makeOverridable (
   {