Update nixos support

Add flake.nix file and update shell.nix.

flake.lock

@@ -0,0 +1,75 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1638122382,
+        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1639947939,
+        "narHash": "sha256-pGsM8haJadVP80GFq4xhnSpNitYNQpaXk4cnA796Cso=",
+        "owner": "nmattia",
+        "repo": "naersk",
+        "rev": "2fc8ce9d3c025d59fee349c1f80be9785049d653",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nmattia",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1640234302,
+        "narHash": "sha256-dALA+cOam5jQ2KOYdWiv6H6Y2stcYG6eclWQQVGx/FI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "81cbfc8f2a1e218249b7bff74013b63150171496",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1640139330,
+        "narHash": "sha256-Nkp3wUOGwtoQ7EH28RLVJ7EqB/e0TU7VcsM7GLy+SdY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "81cef6b70fb5d5cdba5a0fef3f714c2dadaf0d6d",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,92 @@
+{
+  description = "Alternative Free Identity System";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    naersk.url = "github:nmattia/naersk";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, naersk }:
+    let
+      systems = [
+        "aarch64-linux"
+        "aarch64-darwin"
+        "i686-linux"
+        "x86_64-darwin"
+        "x86_64-linux"
+        "i686-windows"
+        "x86_64-windows"
+      ];
+
+    in flake-utils.lib.eachSystem systems (system:
+      let
+
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        naersk-lib = naersk.lib.${system};
+
+        alfis = { webgui ? true, doh ? true, edge ? false }:
+          let
+            features = builtins.concatStringsSep " " (builtins.concatMap
+              ({ option, features }: pkgs.lib.optionals option features) [
+                {
+                  option = webgui;
+                  features = [ "webgui" ];
+                }
+                {
+                  option = doh;
+                  features = [ "doh" ];
+                }
+                {
+                  option = edge;
+                  features = [ "edge" ];
+                }
+              ]);
+          in naersk-lib.buildPackage {
+            pname = "alfis";
+            nativeBuildInputs = with pkgs; [ pkg-config webkitgtk kdialog ];
+            dontWrapQtApps = true;
+            cargoBuildOptions = opts:
+              opts ++ [ "--no-default-features" ]
+              ++ [ "--features" ''"${features}"'' ];
+            root = ./.;
+          };
+
+        isWindows = builtins.elem system [ "i686-windows" "x86_64-windows" ];
+      in rec {
+
+        packages = {
+          alfis = alfis {
+            webgui = true;
+            doh = true;
+            edge = false;
+          };
+          alfisWithoutGUI = alfis {
+            webgui = false;
+            doh = true;
+            edge = false;
+          };
+        } // pkgs.lib.optionalAttrs isWindows {
+          alfisEdge = alfis {
+            webgui = false;
+            doh = true;
+            edge = true;
+          };
+        };
+
+        defaultPackage = packages.alfis;
+
+        apps = with flake-utils.lib;
+          {
+            alfis = mkApp { drv = packages.alfis; };
+            alfisWithoutGUI = mkApp { drv = packages.alfisWithoutGUI; };
+          } // pkgs.lib.optionalAttrs isWindows {
+            alfisEdge = mkApp { drv = packages.alfisEdge; };
+          };
+        defaultApp = apps.alfis;
+
+        devShell = import ./shell.nix { inherit pkgs; };
+
+      });
+}

shell.nix

@@ -1,10 +1,6 @@
-let
-  # Pinned nixpkgs, deterministic. Last updated: 2/12/21.
-  pkgs = import (fetchTarball("https://github.com/NixOS/nixpkgs/archive/a58a0b5098f0c2a389ee70eb69422a052982d990.tar.gz")) {};
+{ pkgs ? import <nixpkgs> { } }:
 
-  # Rolling updates, not deterministic.
-  # pkgs = import (fetchTarball("channel:nixpkgs-unstable")) {};
-
-in pkgs.mkShell {
-  buildInputs = [ pkgs.cargo pkgs.rustc pkgs.webkitgtk pkgs.pkg-config pkgs.kdialog];
+pkgs.mkShell {
+  buildInputs =
+    [ pkgs.cargo pkgs.rustc pkgs.webkitgtk pkgs.pkg-config pkgs.kdialog ];
 }