kardorf: use disko to prepare for hardware change

hosts/kardorf/default.nix

@@ -1,9 +1,13 @@
 {
   pwd,
   pkgs,
+  inputs,
   ...
 }: {
   imports = [
+    inputs.disko.nixosModules.disko
+
+    ./disko.nix
     ./hardware-configuration.nix
 
     "${pwd}/features-nixos/global"
@@ -33,9 +37,6 @@
   networking.hostName = "kardorf";
   system.stateVersion = "22.11";
 
-  # Not using the drivers leads to way better results
-  # services.xserver.videoDrivers = [ "nvidia" ];
-
   programs.ausweisapp.enable = true;
   programs.ausweisapp.openFirewall = true; # for pairing with smartphone
 

hosts/kardorf/disko.nix

@@ -0,0 +1,73 @@
+# https://github.com/nix-community/disko/blob/master/example/btrfs-subvolumes.nix
+{
+  disko.devices = {
+    disk = {
+      main = {
+        type = "disk";
+        device = "/dev/disk/by-diskseq/1";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              priority = 1;
+              name = "ESP";
+              start = "1M";
+              end = "128M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = ["umask=0077"];
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "btrfs";
+                extraArgs = ["-f"]; # Override existing partition
+                # Subvolumes must set a mountpoint in order to be mounted,
+                # unless their parent is mounted
+                subvolumes = {
+                  "/rootfs" = {
+                    mountpoint = "/";
+                  };
+                  "/home" = {
+                    mountOptions = ["compress=zstd"];
+                    mountpoint = "/home";
+                  };
+                  "/nix" = {
+                    mountOptions = [
+                      "compress=zstd"
+                      "noatime"
+                    ];
+                    mountpoint = "/nix";
+                  };
+                  # Subvolume for the swapfile
+                  "/swap" = {
+                    mountpoint = "/.swapvol";
+                    swap = {
+                      swapfile.size = "20M";
+                      swapfile2.size = "20M";
+                      swapfile2.path = "rel-path";
+                    };
+                  };
+                };
+
+                mountpoint = "/partition-root";
+                swap = {
+                  swapfile = {
+                    size = "20M";
+                  };
+                  swapfile1 = {
+                    size = "20M";
+                  };
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}