From c153851ba4ed40fcef2d346a97191d697a6dac93 Mon Sep 17 00:00:00 2001
From: System administrator <root@nixos.ptspaper.de>
Date: Tue, 13 May 2025 11:09:08 +0000
Subject: [PATCH] Initial commit

---
 configuration.nix | 31 ++++++++++++++++++
 disk-config.nix   | 57 +++++++++++++++++++++++++++++++++
 flake.nix         | 81 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+)
 create mode 100644 configuration.nix
 create mode 100644 disk-config.nix
 create mode 100644 flake.nix

diff --git a/configuration.nix b/configuration.nix
new file mode 100644
index 0000000..386fb0c
--- /dev/null
+++ b/configuration.nix
@@ -0,0 +1,31 @@
+{
+  modulesPath,
+  lib,
+  pkgs,
+  ...
+}:
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+    (modulesPath + "/profiles/qemu-guest.nix")
+    ./disk-config.nix
+  ];
+  boot.loader.grub = {
+    # no need to set devices, disko will add all devices that have a EF02 partition to the list already
+    # devices = [ ];
+    efiSupport = true;
+    efiInstallAsRemovable = true;
+  };
+  services.openssh.enable = true;
+
+  environment.systemPackages = map lib.lowPrio [
+    pkgs.curl
+    pkgs.gitMinimal
+  ];
+
+  users.users.root.openssh.authorizedKeys.keys = [
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHDuOIycRP7Ney136ro/doWj1kttJUqmbGz6OC2nia09 michael.huebner@ptspaper.de"    
+  ];
+
+  system.stateVersion = "24.05";
+}
diff --git a/disk-config.nix b/disk-config.nix
new file mode 100644
index 0000000..f2b3408
--- /dev/null
+++ b/disk-config.nix
@@ -0,0 +1,57 @@
+# Example to create a bios compatible gpt partition
+{ lib, ... }:
+{
+  disko.devices = {
+    disk.disk1 = {
+      device = lib.mkDefault "/dev/nvme0n1";
+      type = "disk";
+      content = {
+        type = "gpt";
+        partitions = {
+          boot = {
+            name = "boot";
+            size = "1M";
+            type = "EF02";
+          };
+          esp = {
+            name = "ESP";
+            size = "1G";
+            type = "EF00";
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+            };
+          };
+          root = {
+            name = "root";
+            size = "100%";
+            content = {
+              type = "lvm_pv";
+              vg = "pool";
+            };
+          };
+        };
+      };
+    };
+    lvm_vg = {
+      pool = {
+        type = "lvm_vg";
+        lvs = {
+          root = {
+            size = "100%FREE";
+            content = {
+              type = "filesystem";
+              format = "ext4";
+              mountpoint = "/";
+              mountOptions = [
+                "defaults"
+              ];
+            };
+          };
+        };
+      };
+    };
+  };
+}
+
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..93cd82b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,81 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.disko.url = "github:nix-community/disko";
+  inputs.disko.inputs.nixpkgs.follows = "nixpkgs";
+  inputs.nixos-facter-modules.url = "github:numtide/nixos-facter-modules";
+
+  outputs =
+    {
+      nixpkgs,
+      disko,
+      nixos-facter-modules,
+      ...
+    }:
+    {
+      nixosConfigurations.hetzner-cloud = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = [
+          disko.nixosModules.disko
+          ./configuration.nix
+        ];
+      };
+      # tested with 2GB/2CPU droplet, 1GB droplets do not have enough RAM for kexec
+      nixosConfigurations.digitalocean = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = [
+          disko.nixosModules.disko
+          { disko.devices.disk.disk1.device = "/dev/vda"; }
+          {
+            # do not use DHCP, as DigitalOcean provisions IPs using cloud-init
+            networking.useDHCP = nixpkgs.lib.mkForce false;
+
+            services.cloud-init = {
+              enable = true;
+              network.enable = true;
+              settings = {
+                datasource_list = [ "ConfigDrive" ];
+                datasource.ConfigDrive = { };
+              };
+            };
+          }
+          ./configuration.nix
+        ];
+      };
+      nixosConfigurations.hetzner-cloud-aarch64 = nixpkgs.lib.nixosSystem {
+        system = "aarch64-linux";
+        modules = [
+          disko.nixosModules.disko
+          ./configuration.nix
+        ];
+      };
+
+      # Use this for all other targets
+      # nixos-anywhere --flake .#generic --generate-hardware-config nixos-generate-config ./hardware-configuration.nix <hostname>
+      nixosConfigurations.generic = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = [
+          disko.nixosModules.disko
+          ./configuration.nix
+          ./hardware-configuration.nix
+        ];
+      };
+
+      # Slightly experimental: Like generic, but with nixos-facter (https://github.com/numtide/nixos-facter)
+      # nixos-anywhere --flake .#generic-nixos-facter --generate-hardware-config nixos-facter facter.json <hostname>
+      nixosConfigurations.generic-nixos-facter = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = [
+          disko.nixosModules.disko
+          ./configuration.nix
+          nixos-facter-modules.nixosModules.facter
+          {
+            config.facter.reportPath =
+              if builtins.pathExists ./facter.json then
+                ./facter.json
+              else
+                throw "Have you forgotten to run nixos-anywhere with `--generate-hardware-config nixos-facter ./facter.json`?";
+          }
+        ];
+      };
+    };
+}