add nixdev

flake.lock

@@ -1,5 +1,20 @@
 {
   "nodes": {
+    "impermanence": {
+      "locked": {
+        "lastModified": 1611747548,
+        "narHash": "sha256-2z5wmWda1uI4IkTZrW52jiHq3bzhYLc+GgjvaSd544M=",
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "rev": "58558845bc68dcf2bb32caa80564f7fe3f6cbc61",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1628607662,
@@ -17,6 +32,7 @@
     },
     "root": {
       "inputs": {
+        "impermanence": "impermanence",
         "nixpkgs": "nixpkgs",
         "unstable": "unstable"
       }

flake.nix

@@ -1,10 +1,13 @@
 {
   inputs.nixpkgs.url = "nixpkgs/nixos-21.05";
   inputs.unstable.url = "nixpkgs/nixos-unstable";
+  inputs.impermanence.url = "github:nix-community/impermanence";
 
-  outputs = { self, nixpkgs, ... }@inputs:
+  outputs = { self, nixpkgs, impermanence, ... }@inputs:
     {
       nixosModules = {
+        inherit (impermanence.nixosModules) impermanence;
+
         baseline = import ./modules/baseline.nix;
         cli = import ./modules/cli.nix;
         gnome = import ./modules/gnome.nix;

hosts/nixdev/configuration.nix

@@ -0,0 +1,43 @@
+{ ... }:
+{
+  sconfig = {
+    profile = "server";
+  };
+
+  environment.persistence."/nix/persist" = {
+    files = [
+      "/etc/machine-id"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_rsa_key.pub"
+      "/etc/ssh/ssh_host_rsa_key"
+    ];
+    directories = [
+      "/home"
+      "/var/log"
+    ];
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+
+  boot = {
+    loader.systemd-boot.enable = true;
+    loader.efi.canTouchEfiVariables = true;
+  };
+
+  networking = {
+    useDHCP = false;
+    interfaces.enp6s18.ipv4.addresses = [{ address = "10.5.7.160"; prefixLength = 24; }];
+    defaultGateway = "10.5.7.1";
+    nameservers = [ "1.1.1.1" ];
+  };
+
+  fileSystems =
+    {
+      "/" = { device = "tmpfs"; fsType = "tmpfs"; options = [ "mode=755" ]; };
+      "/boot" = { device = "/dev/disk/by-partlabel/_esp"; fsType = "vfat"; options = [ "discard" "noatime" ]; };
+      "/nix" = { device = "/dev/disk/by-partlabel/_nix"; fsType = "ext4"; options = [ "discard" "noatime" ]; };
+    };
+
+  system.stateVersion = "21.05";
+}

hosts/nixdev/default.nix

@@ -0,0 +1,6 @@
+{
+  pkgs = "nixpkgs";
+  system = "x86_64-linux";
+  hardware = "qemu";
+  module = ./configuration.nix;
+}