.config/nixpkgs/helpers: Use out of tree custom mkShellMinimal

2 files changed, 33 insertions, 30 deletions

diff --git a/.config/nixpkgs/helpers/minimal-mkShell.nix b/.config/nixpkgs/helpers/minimal-mkShell.nix
deleted file mode 100644
index 8723380..0000000
--- a/.config/nixpkgs/helpers/minimal-mkShell.nix
+++ /dev/null
@@ -1,30 +0,0 @@
-### Derived from https://fzakaria.com/2021/08/02/a-minimal-nix-shell.html
-### Usage Example:
-
-# let
-#   minimal = import (builtins.fetchurl {
-#     url = "https://raw.githubusercontent.com/tdro/dotfiles/83b77bf625613a01c47d82e2b08974bfdf219c51/.config/nixpkgs/helpers/minimal-mkShell.nix";
-#     sha256 = "17w4slnz3p28y5h744wz0zw15122230jafy40yz4fsbvzg3hb6fh";
-#   });
-# in minimal.mkShell {
-#   name = "minimal-shell";
-#   buildInputs = [ ];
-#   shellHook = "";
-# }
-
-rec {
-  pkgs = import (builtins.fetchTarball {
-    url = "https://releases.nixos.org/nixos/21.05/nixos-21.05.1510.a165aeceda9/nixexprs.tar.xz";
-    sha256 = "124s05b0xk97arw0vvq8b4wcvsw6024dfdzwcx9qjxf3a2zszmam";
-  }) { };
-
-  stdenv = pkgs.stdenvNoCC.override {
-    cc = null;
-    preHook = "";
-    allowedRequisites = null;
-    initialPath = [ pkgs.busybox ];
-    extraNativeBuildInputs = [ ];
-  };
-
-  mkShell = pkgs.mkShell.override { inherit stdenv; };
-}
diff --git a/.config/nixpkgs/helpers/mkShellMinimal.nix b/.config/nixpkgs/helpers/mkShellMinimal.nix
new file mode 100644
index 0000000..437e557
--- /dev/null
+++ b/.config/nixpkgs/helpers/mkShellMinimal.nix
@@ -0,0 +1,33 @@
+### Source:  https://github.com/NixOS/nixpkgs/commit/459771518d44f60b59a19381d07b12297908215d
+### Article: https://fzakaria.com/2021/08/02/a-minimal-nix-shell.html
+
+{ writeTextFile, writeScript, system }:
+
+{ shellHook ? "", packages ? [ ], ... }@attrs:
+derivation ({
+  inherit system;
+
+  name = "minimal-nix-shell";
+
+  "stdenv" = writeTextFile rec {
+    name = "setup";
+    executable = true;
+    destination = "/${name}";
+    text = ''
+      set -e
+      PATH=
+      for p in ${toString packages}; do
+        export PATH=$p/bin:$PATH
+      done
+      ${shellHook}
+    '';
+  };
+
+  builder = writeScript "builder.sh" ''
+    #!/bin/sh
+    echo
+    echo "This derivation is not meant to be built, unless you want to capture the dependency closure.";
+    echo
+    export > $out
+  '';
+} // attrs)