regenerated flake.lock, added another Nvidia version & hash in a comment

Use runtimeShell instead of #!/usr/bin/env sh

.gitignore

@@ -0,0 +1 @@
+/result

README.md

@@ -101,7 +101,7 @@ After installing `nixVulkanIntel`.
 ```bash
 $ sudo apt install mesa-vulkan-drivers
 ...
-$ nixVulkanIntel $(nix-build '<nixpkgs>' --no-out-link -A vulkan-loader)/bin/vulkaninfo | grep VkPhysicalDeviceProperties -A 7
+$ nixVulkanIntel $(nix-build '<nixpkgs>' --no-out-link -A vulkan-tools)/bin/vulkaninfo | grep VkPhysicalDeviceProperties -A 7
 VkPhysicalDeviceProperties:
 ===========================
         apiVersion     = 0x400036  (1.0.54)

default.nix

@@ -1,29 +0,0 @@
-{ ## Nvidia informations.
-  # Version of the system kernel module. Let it to null to enable auto-detection.
-  nvidiaVersion ? null,
-  # Hash of the Nvidia driver .run file. null is fine, but fixing a value here
-  # will be more reproducible and more efficient.
-  nvidiaHash ? null,
-  # Alternatively, you can pass a path that points to a nvidia version file
-  # and let nixGL extract the version from it. That file must be a copy of
-  # /proc/driver/nvidia/version. Nix doesn't like zero-sized files (see
-  # https://github.com/NixOS/nix/issues/3539 ).
-  nvidiaVersionFile ? null,
-  # Enable 32 bits driver
-  # This is one by default, you can switch it to off if you want to reduce a
-  # bit the size of nixGL closure.
-  enable32bits ? true,
-  # Make sure to enable config.allowUnfree to the instance of nixpkgs to be
-  # able to access the nvidia drivers.
-  pkgs ? import <nixpkgs> {
-    config = { allowUnfree = true; };
-  }
-}:
-pkgs.callPackage ./nixGL.nix {
-  inherit
-    nvidiaVersion
-    nvidiaVersionFile
-    nvidiaHash
-    enable32bits
-    ;
-}

flake.lock

@@ -0,0 +1,72 @@
+{
+  "nodes": {
+    "lowdown-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1598695561,
+        "narHash": "sha256-gyH/5j+h/nWw0W8AcR2WKvNBUsiQ7QuxqSJNXAwV+8E=",
+        "owner": "kristapsdz",
+        "repo": "lowdown",
+        "rev": "1705b4a26fbf065d9574dce47a94e8c7c79e052f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "kristapsdz",
+        "repo": "lowdown",
+        "type": "github"
+      }
+    },
+    "nix": {
+      "inputs": {
+        "lowdown-src": "lowdown-src",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1604964115,
+        "narHash": "sha256-ANcswniHS4eYeMNyCGdiG3z0M35vEyvWoCsdLnTvObA=",
+        "owner": "NixOS",
+        "repo": "nix",
+        "rev": "0ed7c957bed18d963df65d55f0c0ffc79dee656d",
+        "type": "github"
+      },
+      "original": {
+        "id": "nix",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1602702596,
+        "narHash": "sha256-fqJ4UgOb4ZUnCDIapDb4gCrtAah5Rnr2/At3IzMitig=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ad0d20345219790533ebe06571f82ed6b034db31",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-20.09-small",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "narHash": "sha256-wLDweKqbmufa2wonCKBf4Wfl8I0eS1CGS7WdR5tPHKo=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/60330b60655b3fa3a18624bdd7069855bb37af99.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/60330b60655b3fa3a18624bdd7069855bb37af99.tar.gz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nix": "nix",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,49 @@
+{
+  description = "";
+  inputs = {
+    nixpkgs.url = https://github.com/NixOS/nixpkgs/archive/60330b60655b3fa3a18624bdd7069855bb37af99.tar.gz;
+  };
+  outputs = { nixpkgs, nix, self, ... }@inputs : {
+    defaultPackage.x86_64-linux =
+      let pkgs = import nixpkgs { system = "x86_64-linux"; config = { allowUnfree = true; }; }; in
+      (pkgs.callPackage ./nixGL.nix {
+        nvidiaVersionFile = null;
+        nvidiaVersion = "455.28"; nvidiaHash = "03ysf61qrb272yqkn7bhn9d65lcfhmqc2c0dbh5prp5f2ndlkqg4";
+        # nvidiaVersion = "455.23.04"; nvidiaHash = "0rvbb9s4ijb0gyiscd93chbgim4lqmy4ksfy15b4abf078qk7q4g";
+        # …
+        enable32bits = true;
+      }).nixGLIntel; # nixGLNvidia;
+     # nixpkgs.stdenv.mkDerivation {
+     #   builsInputs = [];
+     #   { ## Nvidia informations.
+     #     # Version of the system kernel module. Let it to null to enable auto-detection.
+     #     nvidiaVersion ? null,
+     #     # Hash of the Nvidia driver .run file. null is fine, but fixing a value here
+     #     # will be more reproducible and more efficient.
+     #     nvidiaHash ? null,
+     #     # Alternatively, you can pass a path that points to a nvidia version file
+     #     # and let nixGL extract the version from it. That file must be a copy of
+     #     # /proc/driver/nvidia/version. Nix doesn't like zero-sized files (see
+     #     # https://github.com/NixOS/nix/issues/3539 ).
+     #     nvidiaVersionFile ? null,
+     #     # Enable 32 bits driver
+     #     # This is one by default, you can switch it to off if you want to reduce a
+     #     # bit the size of nixGL closure.
+     #     enable32bits ? true,
+     #     # Make sure to enable config.allowUnfree to the instance of nixpkgs to be
+     #     # able to access the nvidia drivers.
+     #     pkgs ? import <nixpkgs> {
+     #       config = { allowUnfree = true; };
+     #     }
+     #   }:
+     #   pkgs.callPackage ./nixGL.nix {
+     #     inherit
+     #       nvidiaVersion
+     #       nvidiaVersionFile
+     #       nvidiaHash
+     #       enable32bits
+     #     ;
+     #   };
+     # };
+  };
+}

nixGL.nix

@@ -14,7 +14,7 @@
   # bit the size of nixGL closure.
   enable32bits ? true,
   writeTextFile, shellcheck, pcre, runCommand, linuxPackages, fetchurl, lib,
-  bumblebee, libglvnd, vulkan-validation-layers, mesa_drivers,
+  runtimeShell, bumblebee, libglvnd, vulkan-validation-layers, mesa_drivers,
   pkgsi686Linux,zlib, libdrm, xorg, wayland, gcc
 }:
 
@@ -97,7 +97,7 @@ in
   nixGLNvidiaBumblebee = addNvidiaVersion (writeExecutable {
     name = "nixGLNvidiaBumblebee";
     text = ''
-      #!/usr/bin/env sh
+      #!${runtimeShell}
       export LD_LIBRARY_PATH=${lib.makeLibraryPath [nvidia]}:$LD_LIBRARY_PATH
       ${bumblebee.override {nvidia_x11 = nvidia; nvidia_x11_i686 = nvidia.lib32;}}/bin/optirun --ldpath ${lib.makeLibraryPath ([libglvnd nvidia] ++ lib.optionals enable32bits [nvidia.lib32 pkgsi686Linux.libglvnd])} "$@"
     '';
@@ -107,15 +107,15 @@ in
   nixNvidiaWrapper = api: addNvidiaVersion (writeExecutable {
     name = "nix${api}Nvidia";
     text = ''
-      #!/usr/bin/env sh
+      #!${runtimeShell}
       ${lib.optionalString (api == "Vulkan") ''export VK_LAYER_PATH=${vulkan-validation-layers}/share/vulkan/explicit_layer.d''}
 
-        ${lib.optionalString (api == "Vulkan") ''export VK_ICD_FILENAMES=${nvidia}/share/vulkan/icd.d/nvidia.json${lib.optionalString enable32bits ":${nvidia.lib32}/share/vulkan/icd.d/nvidia.json"}:$VK_ICD_FILENAMES''}
+        ${lib.optionalString (api == "Vulkan") ''export VK_ICD_FILENAMES=${nvidiaLibsOnly}/share/vulkan/icd.d/nvidia.json${lib.optionalString enable32bits ":${nvidiaLibsOnly.lib32}/share/vulkan/icd.d/nvidia.json"}:$VK_ICD_FILENAMES''}
         export LD_LIBRARY_PATH=${lib.makeLibraryPath ([
           libglvnd
           nvidiaLibsOnly
         ] ++ lib.optional (api == "Vulkan") vulkan-validation-layers
-        ++ lib.optionals enable32bits [nvidia.lib32 pkgsi686Linux.libglvnd])
+        ++ lib.optionals enable32bits [nvidiaLibsOnly.lib32 pkgsi686Linux.libglvnd])
       }:''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
         "$@"
       '';
@@ -133,7 +133,7 @@ in
     text = let
       drivers = [mesa_drivers] ++ lib.optional enable32bits pkgsi686Linux.mesa_drivers;
     in ''
-      #!/usr/bin/env sh
+      #!${runtimeShell}
       export LIBGL_DRIVERS_PATH=${lib.makeSearchPathOutput "lib" "lib/dri" drivers}
       export LD_LIBRARY_PATH=${
         lib.makeLibraryPath drivers
@@ -158,7 +158,7 @@ in
           + ''cat f | xargs | sed "s/ /:/g" > $out''
           );
       in ''
-     #!/usr/bin/env bash
+     #!${runtimeShell}
      if [ -n "$LD_LIBRARY_PATH" ]; then
        echo "Warning, nixVulkanIntel overwriting existing LD_LIBRARY_PATH" 1>&2
      fi
@@ -179,14 +179,14 @@ in
   };
 
   nixGLCommon = nixGL:
-  runCommand "nixGLCommon" {
-  buildInuts = [nixGL];
-  }
-  ''
-  mkdir -p "$out/bin"
-  # star because nixGLNvidia... have version prefixed name
-  cp ${nixGL}/bin/* "$out/bin/nixGL";
-  '';
+    runCommand "nixGLCommon" {
+      buildInuts = [nixGL];
+    }
+      ''
+      mkdir -p "$out/bin"
+      # star because nixGLNvidia... have version prefixed name
+      cp ${nixGL}/bin/* "$out/bin/nixGL";
+      '';
 
   # The output derivation contains nixGL which point either to
   # nixGLNvidia or nixGLIntel using an heuristic.