MiniNix

configuration.nix

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+# This is a small config that can be used to bootstrap a system with ZFS.
+{ config, lib, modulesPath, ... }:
+{
+  imports =
+    [
+      (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  # Generate a hostId for ZFS
+  # head -c4 /dev/urandom | od -A none -t x4
+  networking.hostId = "f35c6293";
+  networking.hostName = "MiniNix";
+  boot = {
+    initrd.availableKernelModules = [ "xhci_pci" "ahci" "nvme" "usbhid" "usb_storage" "sd_mod" ];
+    initrd.kernelModules = [ ];
+    kernelModules = [ "kvm-intel" ];
+    extraModulePackages = [ ];
+    loader = {
+      grub = {
+        enable = true;
+        zfsSupport = true;
+        device = "nodev";
+        mirroredBoots = [
+          { devices = [ "nodev" ]; path = "/boot"; }
+        ];
+      };
+    };
+  };
+
+  fileSystems."/" = {
+    device = "zroot/root";
+    fsType = "zfs";
+  };
+
+  fileSystems."/nix" = {
+    device = "zroot/nix";
+    fsType = "zfs";
+  };
+
+  fileSystems."/var" = {
+    device = "zroot/var";
+    fsType = "zfs";
+  };
+
+  fileSystems."/home" = {
+    device = "zroot/home";
+    fsType = "zfs";
+  };
+
+  swapDevices = [ ];
+
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+  system.stateVersion = "24.05";
+}

disko-nixos.nix

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+{ disks ? [ "/dev/sda" ], ... }: {
+  disko.devices = {
+    disk = {
+      main = {
+        type = "disk";
+        device = builtins.elemAt disks 0;
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              size = "1024M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            zfs = {
+              size = "100%";
+              content = {
+                type = "zfs";
+                pool = "zroot";
+              };
+            };
+          };
+        };
+      };
+    };
+    zpool = {
+      zroot = {
+        type = "zpool";
+        mode = "";
+        rootFsOptions = {
+          compression = "zstd";
+          "com.sun:auto-snapshot" = "false";
+          mountpoint = "none";
+          acltype = "posixacl";
+        };
+        mountOptions = [
+          "ashift=12"
+        ];
+
+        postCreateHook = "zfs list -t snapshot -H -o name | grep -E '^zroot@blank$' || zfs snapshot zroot@blank";
+
+        datasets = {
+          root = {
+            type = "zfs_fs";
+            mountpoint = "/";
+          };
+
+          nix = {
+            type = "zfs_fs";
+            mountpoint = "/nix";
+          };
+
+          var = {
+            type = "zfs_fs";
+            mountpoint = "/var";
+          };
+
+          home = {
+            type = "zfs_fs";
+            mountpoint = "/home";
+            options = {
+              "com.sun:auto-snapshot" = "true";
+            };
+          };
+        };
+      };
+    };
+  };
+}

flake.lock

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+{
+  "nodes": {
+    "disko": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1720056646,
+        "narHash": "sha256-BymcV4HWtx2VFuabDCM4/nEJcfivCx0S02wUCz11mAY=",
+        "owner": "nix-community",
+        "repo": "disko",
+        "rev": "64679cd7f318c9b6595902b47d4585b1d51d5f9e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "disko",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1720110830,
+        "narHash": "sha256-E5dN9GDV4LwMEduhBLSkyEz51zM17XkWZ3/9luvNOPs=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c0d0be00d4ecc4b51d2d6948e37466194c1e6c51",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "disko": "disko",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "MiniNix";
+
+  inputs = {
+    # Nixpkgs
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
+
+    # disko - Declarative disk partitioning and formatting using nix
+    disko = {
+      url = "github:nix-community/disko";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, disko, ... }@inputs: {
+    nixosConfigurations = {
+      "mini-x86" = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        specialArgs = { inherit inputs; };
+        modules = [
+          ./configuration.nix
+          disko.nixosModules.disko
+          (import ./disko-nixos.nix { disks = [ "/dev/nvme0n1" ]; })
+        ];
+      };
+    };
+  };
+}