modules/direnv: Implement pre-cached devshells

That means, that the devshells are only build once and centrally
updated. Ideally, they would be built upon system update, but I haven't
figured out a way to run `nix print-dev-env` in a nix build sandbox yet
(and hope, that it's not necessary anymore once, that functionality
moves to nixpkgs' `mkShell`).

2 files changed, 38 insertions, 0 deletions

diff --git a/pkgs/by-name/di/direnv-patched/0001-rc-Also-consider-.nenvrc-files.patch b/pkgs/by-name/di/direnv-patched/0001-rc-Also-consider-.nenvrc-files.patch
new file mode 100644
index 00000000..fa2716f4
--- /dev/null
+++ b/pkgs/by-name/di/direnv-patched/0001-rc-Also-consider-.nenvrc-files.patch
@@ -0,0 +1,28 @@
+From c7fd4ebf40f2cec9ce23c4227fc48402c0469e69 Mon Sep 17 00:00:00 2001
+From: Benedikt Peetz <benedikt.peetz@b-peetz.de>
+Date: Thu, 13 Aug 2026 17:47:06 +0200
+Subject: [PATCH] rc: Also consider `.nenvrc` files
+
+---
+ internal/cmd/rc.go | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/internal/cmd/rc.go b/internal/cmd/rc.go
+index 4167ecf..d7f5886 100644
+--- a/internal/cmd/rc.go
++++ b/internal/cmd/rc.go
+@@ -391,9 +391,9 @@ func allow(path string, allowPath string) (err error) {
+ 
+ func findEnvUp(searchDir string, loadDotenv bool) (path string) {
+ 	if loadDotenv {
+-		return findUp(searchDir, ".envrc", ".env")
++		return findUp(searchDir, ".envrc", ".nenvrc", ".env")
+ 	}
+-	return findUp(searchDir, ".envrc")
++	return findUp(searchDir, ".envrc", ".nenvrc")
+ }
+ 
+ func findUp(searchDir string, fileNames ...string) (path string) {
+-- 
+2.55.0
+
diff --git a/pkgs/by-name/di/direnv-patched/package.nix b/pkgs/by-name/di/direnv-patched/package.nix
new file mode 100644
index 00000000..64f55bba
--- /dev/null
+++ b/pkgs/by-name/di/direnv-patched/package.nix
@@ -0,0 +1,10 @@
+{direnv}:
+direnv.overrideAttrs (final: prev: {
+  pname = "${prev.pname}-patched";
+
+  patches =
+    (prev.patches or [])
+    ++ [
+      ./0001-rc-Also-consider-.nenvrc-files.patch
+    ];
+})