add multi-nixpkgs flake

flake.nix

@@ -16,6 +16,12 @@
         '';
         path = ./standard;
       };
+      multi-nixpkgs = {
+        description = ''
+          An example, based on the standard flake, on how to use two (or more) nixpkgs versions
+        '';
+        path = ./multi-nixpkgs;
+      };
     };
   };
 }

multi-nixpkgs/flake.lock

@@ -0,0 +1,97 @@
+{
+  "nodes": {
+    "hardware": {
+      "locked": {
+        "lastModified": 1667585378,
+        "narHash": "sha256-cvOwucrjBaAkaGk3FunG+MQiwiSBeIVTtO5n/YavpC0=",
+        "owner": "nixos",
+        "repo": "nixos-hardware",
+        "rev": "6b35a59c19ddbbeb229fcd1d3dcd422dcc0fa927",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixos-hardware",
+        "type": "github"
+      }
+    },
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "utils": "utils"
+      },
+      "locked": {
+        "lastModified": 1667574732,
+        "narHash": "sha256-73TVk3uSQOja6Q/5OuNcpcqwo6+SMzJPRtYAjU0rBx4=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "b764068a506c6f70dba998efa0e7fcb99cb4deb2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1667482890,
+        "narHash": "sha256-pua0jp87iwN7NBY5/ypx0s9L9CG49Ju/NI4wGwurHc4=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "a2a777538d971c6b01c6e54af89ddd6567c055e8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-master": {
+      "locked": {
+        "lastModified": 1667669848,
+        "narHash": "sha256-nD2dk2A+1zUlUT18ppDFVWwimi26+ultc2QRsulQwQ8=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "1f3ebb2bd1a353a42e8f833895c26d8415c7b791",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "hardware": "hardware",
+        "home-manager": "home-manager",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-master": "nixpkgs-master"
+      }
+    },
+    "utils": {
+      "locked": {
+        "lastModified": 1667077288,
+        "narHash": "sha256-bdC8sFNDpT0HK74u9fUkpbf1MEzVYJ+ka7NXCdgBoaA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "6ee9ebb6b1ee695d2cacc4faa053a7b9baa76817",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

multi-nixpkgs/flake.nix

@@ -0,0 +1,83 @@
+{
+  description = "Your new nix config";
+
+  inputs = {
+    # Nixpkgs
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    nixpkgs-master.url = "github:nixos/nixpkgs/master";
+
+    # Home manager
+    home-manager.url = "github:nix-community/home-manager";
+    home-manager.inputs.nixpkgs.follows = "nixpkgs";
+
+    # TODO: Add any other flake you might need
+    hardware.url = "github:nixos/nixos-hardware";
+
+    # Shameless plug: looking for a way to nixify your themes and make
+    # everything match nicely? Try nix-colors!
+    # nix-colors.url = "github:misterio77/nix-colors";
+  };
+
+  outputs = { nixpkgs, home-manager, ... }@inputs:
+    let
+      forAllSystems = nixpkgs.lib.genAttrs [
+        "aarch64-linux"
+        "i686-linux"
+        "x86_64-linux"
+        "aarch64-darwin"
+        "x86_64-darwin"
+      ];
+    in
+    rec {
+      # Your custom packages
+      # Acessible through 'nix build', 'nix shell', etc
+      packages = forAllSystems (system:
+        let pkgs = nixpkgs.legacyPackages.${system};
+        in
+        import ./pkgs { inherit pkgs; }
+      );
+      # Devshell for bootstrapping
+      # Acessible through 'nix develop' or 'nix-shell' (legacy)
+      devShells = forAllSystems (system:
+        let pkgs = nixpkgs.legacyPackages.${system};
+        in
+        import ./shell.nix { inherit pkgs; }
+      );
+
+      # Your custom packages and modifications, exported as overlays
+      overlays = import ./overlays { inherit inputs; };
+      # Reusable nixos modules you might want to export
+      # These are usually stuff you would upstream into nixpkgs
+      nixosModules = import ./modules/nixos;
+      # Reusable home-manager modules you might want to export
+      # These are usually stuff you would upstream into home-manager
+      homeManagerModules = import ./modules/home-manager;
+
+      nixosConfigurations = {
+        # FIXME replace with your hostname
+        your-hostname = nixpkgs.lib.nixosSystem {
+          specialArgs = { inherit inputs; }; # Pass flake inputs to our config
+          modules = (builtins.attrValues nixosModules) ++ [
+            # > Our main nixos configuration file <
+            ./nixos/configuration.nix
+            # Our common nixpkgs config (unfree, overlays, etc)
+            (import ./nixpkgs-config.nix { inherit overlays; })
+          ];
+        };
+      };
+
+      homeConfigurations = {
+        # FIXME replace with your username@hostname
+        "your-username@your-hostname" = home-manager.lib.homeManagerConfiguration {
+          pkgs = nixpkgs.legacyPackages.x86_64-linux; # Home-manager requires 'pkgs' instance
+          extraSpecialArgs = { inherit inputs; }; # Pass flake inputs to our config
+          modules = (builtins.attrValues homeManagerModules) ++ [
+            # > Our main home-manager configuration file <
+            ./home-manager/home.nix
+            # Our common nixpkgs config (unfree, overlays, etc)
+            (import ./nixpkgs-config.nix { inherit overlays; })
+          ];
+        };
+      };
+    };
+}

multi-nixpkgs/home-manager

@@ -0,0 +1 @@
+../standard/home-manager

multi-nixpkgs/modules

@@ -0,0 +1 @@
+../standard/modules

multi-nixpkgs/nixos

@@ -0,0 +1 @@
+../standard/nixos

multi-nixpkgs/nixpkgs-config.nix

@@ -0,0 +1 @@
+../standard/nixpkgs-config.nix

multi-nixpkgs/overlays/default.nix

@@ -0,0 +1,20 @@
+{ inputs, ... }:
+# This file defines overlays
+{
+  # Add bleeding edge packages under the 'master' namespace
+  master = final: _prev: {
+    master = inputs.nixpkgs-master.legacyPackages.${final.system};
+  };
+
+  # This one brings our custom packages from the 'pkgs' directory
+  additions = final: _prev: import ../pkgs { pkgs = final; };
+
+  # This one contains whatever you want to overlay
+  # You can change versions, add patches, set compilation flags, anything really.
+  # https://nixos.wiki/wiki/Overlays
+  modifications = final: prev: {
+    # example = prev.example.overrideAttrs (oldAttrs: rec {
+    # ...
+    # });
+  };
+}

multi-nixpkgs/pkgs

@@ -0,0 +1 @@
+../standard/pkgs

multi-nixpkgs/shell.nix

@@ -0,0 +1 @@
+../standard/shell.nix