Use flakes

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+[*.{yaml,yml}]
+indent_size = 2
+
+[Makefile]
+indent_style = tab

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1 +1,2 @@
-/configuration.nix
+result*
+.pre-commit-config.yaml

flake.lock

@@ -0,0 +1,68 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1634851050,
+        "narHash": "sha256-N83GlSGPJJdcqhUxSCS/WwW5pksYf3VP1M13cDRTSVA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c91f3de5adaf1de973b797ef7485e441a65b8935",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nix-pre-commit-hooks": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1634595438,
+        "narHash": "sha256-hV9D41fqTateTligwNd9dmJKQ0R0w6RpCN92xR3LhHk=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "06fa80325b6fe3b28d136071dd0ce55d4817e9fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "master",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1636138231,
+        "narHash": "sha256-FZQ5wBcB9zI21uQMB/PaEQ/cLYk+Bwnig5cg1+2rPgg=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "5c02380de3951d0237807c16eb19873cb3c5f75d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-21.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nix-pre-commit-hooks": "nix-pre-commit-hooks",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,64 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.05";
+
+    nix-pre-commit-hooks = {
+      url = "github:cachix/pre-commit-hooks.nix/master";
+      inputs.flake-utils.follows = "flake-utils";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+  outputs =
+    { self
+    , nixpkgs
+    , flake-utils
+    , nix-pre-commit-hooks
+    , ...
+    }@inputs: flake-utils.lib.eachDefaultSystem
+      (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        inherit (pkgs) lib;
+      in
+      {
+        checks = {
+          pre-commit-check = nix-pre-commit-hooks.lib.${system}.run {
+            src = self;
+            hooks = {
+              black.enable = true;
+              nixpkgs-fmt.enable = true;
+              shellcheck.enable = true;
+            };
+          };
+        };
+        devShell = pkgs.mkShell {
+          buildInputs = (with pkgs; [
+            black
+            nixpkgs-fmt
+            shellcheck
+          ]);
+
+          shellHook = ''
+            ${self.checks.${system}.pre-commit-check.shellHook}
+          '';
+        };
+      }) // {
+      nixosConfigurations = nixpkgs.lib.mapAttrs
+        (hostname: { system
+                   , extraModules ? [ ]
+                   , nixpkgs ? inputs.nixpkgs
+                   }: nixpkgs.lib.nixosSystem rec {
+          inherit system;
+
+          modules = [
+            (./machines + "/${hostname}/configuration.nix")
+
+            {
+              _module.args.inputs = inputs;
+            }
+          ] ++ extraModules;
+        })
+        (import ./machines inputs);
+    };
+}

machines/cadmium/hardware-configuration.nix

@@ -1,8 +1,8 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, modulesPath, ... }:
 
 {
-  imports =
-    [ <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
+  imports = [
+    "${modulesPath}/installer/scan/not-detected.nix"
   ];
 
   boot.initrd.availableKernelModules = [ "xhci_pci" "ehci_pci" "ahci" "usbhid" "usb_storage" "sd_mod" "sr_mod" ];

machines/default.nix

@@ -0,0 +1,11 @@
+inputs: {
+  jalr-t520 = {
+    system = "x86_64-linux";
+  };
+  cadmium = {
+    system = "x86_64-linux";
+  };
+  hafnium = {
+    system = "x86_64-linux";
+  };
+}

machines/hafnium/hardware-configuration.nix

@@ -1,8 +1,8 @@
 { config, lib, pkgs, modulesPath, ... }:
 
 {
-  imports =
-    [ (modulesPath + "/installer/scan/not-detected.nix")
+  imports = [
+    "${modulesPath}/installer/scan/not-detected.nix"
   ];
 
   boot.initrd.availableKernelModules = [ "nvme" "ehci_pci" "xhci_pci" "usb_storage" "sd_mod" "rtsx_pci_sdmmc" ];

machines/jalr-t520/hardware-configuration.nix

@@ -1,8 +1,8 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, modulesPath, ... }:
 
 {
-  imports =
-    [ <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
+  imports = [
+    "${modulesPath}/installer/scan/not-detected.nix"
   ];
 
   boot.initrd.availableKernelModules = [ "ehci_pci" "ahci" "firewire_ohci" "usb_storage" "usbhid" "sd_mod" "sdhci_pci" ];