From 4374f2feda09dc518d5e926f45f60640ac2d2fa1 Mon Sep 17 00:00:00 2001
From: pennae <github@quasiparticle.net>
Date: Sun, 31 Dec 2023 18:08:46 +0100
Subject: [PATCH] nixos/doc: avoid bash argument list size limit

see #277861. as the module list grows the argument size in the
lazy-options nix call grows, eventually reaching a hard limit and
causing the build to fail. writing the list to a file instead and import
it instead of providing it directly circumvents this.
---
 nixos/modules/misc/documentation.nix | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/nixos/modules/misc/documentation.nix b/nixos/modules/misc/documentation.nix
index 46462c5abd43..f3e698468e64 100644
--- a/nixos/modules/misc/documentation.nix
+++ b/nixos/modules/misc/documentation.nix
@@ -77,7 +77,11 @@ let
           libPath = filter (pkgs.path + "/lib");
           pkgsLibPath = filter (pkgs.path + "/pkgs/pkgs-lib");
           nixosPath = filter (pkgs.path + "/nixos");
-          modules = map (p: ''"${removePrefix "${modulesPath}/" (toString p)}"'') docModules.lazy;
+          modules =
+            "[ "
+            + concatMapStringsSep " " (p: ''"${removePrefix "${modulesPath}/" (toString p)}"'') docModules.lazy
+            + " ]";
+          passAsFile = [ "modules" ];
         } ''
           export NIX_STORE_DIR=$TMPDIR/store
           export NIX_STATE_DIR=$TMPDIR/state
@@ -87,7 +91,7 @@ let
             --argstr libPath "$libPath" \
             --argstr pkgsLibPath "$pkgsLibPath" \
             --argstr nixosPath "$nixosPath" \
-            --arg modules "[ $modules ]" \
+            --arg modules "import $modulesPath" \
             --argstr stateVersion "${options.system.stateVersion.default}" \
             --argstr release "${config.system.nixos.release}" \
             $nixosPath/lib/eval-cacheable-options.nix > $out \