Change lithium to ZFS+impermanence

disko/luks-zfs-impermanence.nix

@@ -0,0 +1,80 @@
+{
+  disko.devices = {
+    disk = {
+      main = {
+        device = "/dev/sda";
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              name = "boot";
+              type = "EF00";
+              size = "512M";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            swap = {
+              size = "4G";
+              content = {
+                type = "swap";
+                discardPolicy = "both";
+                randomEncryption = true;
+              };
+            };
+            luks = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "crypted";
+                settings = {
+                  bypassWorkqueues = true;
+                  allowDiscards = true;
+                };
+                extraFormatArgs = [ "-i 5000" ];
+                content = {
+                  type = "zfs";
+                  pool = "zroot";
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+    zpool = {
+      zroot = {
+        type = "zpool";
+        rootFsOptions = {
+          canmount = "off";
+          compression = "zstd";
+        };
+        datasets = {
+          nix = {
+            type = "zfs_fs";
+            mountpoint = "/nix";
+            options.mountpoint = "legacy";
+          };
+          persist = {
+            type = "zfs_fs";
+            options = {
+              mountpoint = "legacy";
+              "com.sun:auto-snapshot" = "true";
+            };
+            mountpoint = "/persist";
+          };
+          root = {
+            type = "zfs_fs";
+            mountpoint = "/";
+            options.mountpoint = "legacy";
+            postCreateHook = "zfs snapshot zroot/root@blank";
+          };
+        };
+      };
+    };
+  };
+}

hosts/x86_64-linux/lithium.nix

@@ -1,5 +1,7 @@
 { ... }:
 {
+  imports = [ ../../disko/luks-zfs-impermanence.nix ];
+
   custom = {
     roles = {
       desktop.enable = true;
@@ -19,31 +21,13 @@
       };
     };
     hardware.intelLaptop.enable = true;
-    platform.hibernate.enable = true;
     services = {
-      syncthing.enable = true;
       nixCacheClient = {
         enable = true;
         remoteBuilds.additional = true;
       };
     };
   };
-  system.stateVersion = "24.05";
-
-  boot.kernelParams = [ "resume_offset=39292928" ];
-  fileSystems."/" = {
-    device = "/dev/disk/by-uuid/b43fe465-80e9-48d4-a4be-1113c917330e";
-    fsType = "ext4";
-  };
-
-  boot.initrd.luks.devices."nixos".device = "/dev/disk/by-uuid/4dc2fd8c-71da-4b95-91d5-7a118387172b";
-
-  fileSystems."/boot" = {
-    device = "/dev/disk/by-uuid/D8BB-B91A";
-    fsType = "vfat";
-    options = [
-      "fmask=0077"
-      "dmask=0077"
-    ];
-  };
+  networking.hostId = "ca94a90c";
+  system.stateVersion = "25.05";
 }

modules/platform/impermanence.nix

@@ -3,10 +3,7 @@ let
   cfg = config.custom.platform.impermanence;
 in
 {
-  options.custom.platform.impermanence.enable = lib.mkOption {
-    type = lib.types.bool;
-    default = false;
-  };
+  options.custom.platform.impermanence.enable = lib.mkEnableOption "custom impermanence setup";
 
   config = lib.mkIf cfg.enable {
     # Default set of directories we always want to persist

modules/roles/personal-machine.nix

@@ -7,12 +7,11 @@ let
   cfg = config.custom.roles.personalMachine;
 in
 {
-  options.custom.roles.personalMachine.enable = lib.mkOption {
-    type = lib.types.bool;
-    default = false;
-  };
+  options.custom.roles.personalMachine.enable =
+    lib.mkEnableOption "role for personal machines (desktop/laptop)";
 
-  config = lib.mkIf cfg.enable {
+  config =
+    (lib.mkIf cfg.enable {
       custom = {
         hardware = {
           keychron.enable = true;
@@ -30,5 +29,16 @@ in
         };
       };
       system.autoUpgrade.allowReboot = lib.mkForce false;
-  };
+    })
+    // (lib.mkIf config.custom.platform.impermanence.enable {
+      # TODO Remove this temporary impermanence setup in favor of a more detailed one
+      environment.persistence."/persist".directories = [
+        {
+          directory = config.users.users.vili.home;
+          user = config.users.users.vili.name;
+          group = config.users.users.vili.group;
+          mode = "u=rwx,g=,o=";
+        }
+      ];
+    });
 }