overhaul for pi4

system-config/configuration/pi4/disko.nix

@@ -0,0 +1,66 @@
+{
+  device1 ? throw "Set this to your disk device, e.g. /dev/sda",
+  ...
+}: {
+  disko.devices = {
+      disk = {
+          main = {
+              device = device1;
+              type = "disk";
+              content = {
+                  type = "gpt";
+                  partitions = {
+                      boot = {
+                          name = "boot";
+                          size = "1M";
+                          type = "EF02";
+                      };
+                      esp = {
+                          name = "ESP";
+                          size = "500M";
+                          type = "EF00";
+                          content = {
+                              type = "filesystem";
+                              format = "vfat";
+                              mountpoint = "/boot";
+                          };
+                      };
+                      root = {
+                          name = "root";
+                          size = "100%";
+                          content = {
+                              type = "lvm_pv";
+                              vg = "root_vg";
+                          };
+                      };
+                  };
+              };
+          };
+      };
+      lvm_vg = {
+          root_vg = {
+              type = "lvm_vg";
+              lvs = {
+                  root = {
+                      size = "100%FREE";
+                      content = {
+                          type = "btrfs";
+                          extraArgs = ["-f"];
+
+                          subvolumes = {
+                              "/root" = {
+                                  mountpoint = "/";
+                              };
+
+                              "/nix" = {
+                                  mountOptions = ["subvol=nix" "noatime"];
+                                  mountpoint = "/nix";
+                              };
+                          };
+                      };
+                  };
+              };
+          };
+      };    
+  };
+}