From 828f036e26f947f58e639b70301c984246bcf4c7 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sat, 19 Apr 2025 13:03:24 +0200
Subject: ...

---
 overlays/nix-direnv/default.nix      | 53 ++++++++++++++++++++++++++++++
 overlays/nix-direnv/static-nix.patch | 62 ++++++++++++++++++++++++++++++++++++
 user-profiles/direnv.nix             |  9 ++----
 3 files changed, 117 insertions(+), 7 deletions(-)
 create mode 100644 overlays/nix-direnv/default.nix
 create mode 100644 overlays/nix-direnv/static-nix.patch

diff --git a/overlays/nix-direnv/default.nix b/overlays/nix-direnv/default.nix
new file mode 100644
index 00000000..7c488e4e
--- /dev/null
+++ b/overlays/nix-direnv/default.nix
@@ -0,0 +1,53 @@
+{ final, prev, ... }: {
+  nix-direnv = prev.resholve.mkDerivation rec {
+    pname = "nix-direnv";
+    version = "3.0.6";
+
+    patches = [
+      ./static-nix.patch
+    ];
+
+    src = prev.fetchFromGitHub {
+      owner = "nix-community";
+      repo = "nix-direnv";
+      rev = version;
+      hash = "sha256-oNqhPqgQT92yxbKmcgX4F3e2yTUPyXYG7b2xQm3TvQw=";
+    };
+
+    installPhase = ''
+      runHook preInstall
+      install -m400 -D direnvrc $out/share/nix-direnv/direnvrc
+      runHook postInstall
+    '';
+
+    solutions = {
+      default = {
+        scripts = [ "share/nix-direnv/direnvrc" ];
+        interpreter = "none";
+        inputs = with final; [ coreutils nix-monitored ];
+        fake = {
+          builtin = [
+            "PATH_add"
+            "direnv_layout_dir"
+            "has"
+            "log_error"
+            "log_status"
+            "watch_file"
+          ];
+          function = [
+            # not really a function - this is in an else branch for macOS/homebrew that
+            # cannot be reached when built with nix
+            "shasum"
+          ];
+        };
+        keep = {
+          "$cmd" = true;
+          "$direnv" = true;
+        };
+        execer = [
+          "cannot:${prev.lib.getExe' final.nix-monitored "nix"}"
+        ];
+      };
+    };
+  };
+}
diff --git a/overlays/nix-direnv/static-nix.patch b/overlays/nix-direnv/static-nix.patch
new file mode 100644
index 00000000..5de8193f
--- /dev/null
+++ b/overlays/nix-direnv/static-nix.patch
@@ -0,0 +1,62 @@
+diff --git i/direnvrc w/direnvrc
+index ddac0f5..fbcade6 100644
+--- i/direnvrc
++++ w/direnvrc
+@@ -29,10 +29,8 @@ _nix_direnv_warning() {
+ 
+ _nix_direnv_error() { log_error "${_NIX_DIRENV_LOG_PREFIX}$*"; }
+ 
+-_nix_direnv_nix=""
+-
+ _nix() {
+-  ${_nix_direnv_nix} --extra-experimental-features "nix-command flakes" "$@"
++  nix --extra-experimental-features "nix-command flakes" "$@"
+ }
+ 
+ _require_version() {
+@@ -55,34 +53,6 @@ _require_cmd_version() {
+   _require_version "$cmd" "${BASH_REMATCH[1]}" "$required"
+ }
+ 
+-_nix_direnv_resolve_nix() {
+-  local ambient_nix
+-
+-  if ambient_nix=$(command -v nix); then
+-    if _require_cmd_version "${ambient_nix}" "${NIX_MIN_VERSION}"; then
+-      echo "${ambient_nix}"
+-      return 0
+-    else
+-      _nix_direnv_warning "Nix version in PATH is too old, wanted ${NIX_MIN_VERSION}+, got $(${ambient_nix} --version), will attempt fallback"
+-    fi
+-  else
+-    _nix_direnv_warning "Could not find Nix in PATH, will attempt fallback"
+-  fi
+-
+-  if [ -n "${NIX_DIRENV_FALLBACK_NIX}" ]; then
+-    if _require_cmd_version "${NIX_DIRENV_FALLBACK_NIX}" "${NIX_MIN_VERSION}"; then
+-      echo "${NIX_DIRENV_FALLBACK_NIX}"
+-      return 0
+-    else
+-      _nix_direnv_error "Fallback Nix version is too old, wanted ${NIX_MIN_VERSION}+, got $(${NIX_DIRENV_FALLBACK_NIX} --version)"
+-      return 1
+-    fi
+-  else
+-    _nix_direnv_error "Could not find fallback Nix binary, please add Nix to PATH or set NIX_DIRENV_FALLBACK_NIX"
+-    return 1
+-  fi
+-}
+-
+ _nix_direnv_preflight() {
+   if [[ -z $direnv ]]; then
+     # shellcheck disable=2016
+@@ -102,10 +72,6 @@ _nix_direnv_preflight() {
+     fi
+   fi
+ 
+-  if ! _nix_direnv_nix=$(_nix_direnv_resolve_nix); then
+-    return 1
+-  fi
+-
+   local layout_dir
+   layout_dir=$(direnv_layout_dir)
+ 
diff --git a/user-profiles/direnv.nix b/user-profiles/direnv.nix
index 3cc1af3e..7887d765 100644
--- a/user-profiles/direnv.nix
+++ b/user-profiles/direnv.nix
@@ -1,14 +1,9 @@
-{ userName, pkgs, ... }:
+{ userName, ... }:
 {
   home-manager.users.${userName} = {
     programs.direnv = {
       enable = true;
-      nix-direnv = {
-        enable = true;
-        package = pkgs.nix-direnv.override {
-          nix = pkgs.nix-monitored;
-        };
-      };
+      nix-direnv.enable = true;
     };
   };
 }
-- 
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