Fix impermanence vm

systems/common.nix

@@ -0,0 +1,20 @@
+# Common configuration for all systems
+
+{  ... }:
+
+{
+    nix = {
+        settings.auto-optimise-store = true;
+
+        # Clean generations older than a week
+        gc = {
+            automatic = false; # Flip this to do it automatically
+            dates = "weekly";
+            options = "--delete-older-than 7d";
+        };
+    };
+
+    nixpkgs.config.allowUnfree = true;
+
+    system.stateVersion = "23.05";
+}

systems/hardware/qemu-vm.nix

@@ -1,53 +1,36 @@
-# Do not modify this file!  It was generated by ‘nixos-generate-config’
-# and may be overwritten by future invocations.  Please make changes
-# to /etc/nixos/configuration.nix instead.
-{ config, lib, pkgs, modulesPath, ... }:
+{lib, modulesPath, ... }:
 
 {
-  imports =
-    [ (modulesPath + "/profiles/qemu-guest.nix")
-    ];
+  imports = [ 
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
 
   boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
   boot.initrd.kernelModules = [ ];
+
+  boot.initrd.postDeviceCommands = lib.mkAfter ''
+    zfs rollback -r local/root@blank
+  '';
+
   boot.kernelModules = [ "kvm-amd" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/" =
-    { device = "/dev/disk/by-uuid/cba5b18e-14e6-479d-baf5-0827fced96e7";
-      fsType = "btrfs";
-      options = [ "subvol=root" ];
-    };
+  boot.zfs.devNodes = "/dev/disk/by-path";
 
-  fileSystems."/home" =
-    { device = "/dev/disk/by-uuid/cba5b18e-14e6-479d-baf5-0827fced96e7";
-      fsType = "btrfs";
-      options = [ "subvol=home" ];
-    };
+  fileSystems."/" = { 
+     device = "local/root";
+     fsType = "zfs";
+  };
 
-  fileSystems."/nix" =
-    { device = "/dev/disk/by-uuid/cba5b18e-14e6-479d-baf5-0827fced96e7";
-      fsType = "btrfs";
-      options = [ "subvol=nix" ];
-    };
-
-  fileSystems."/persist" =
-    { device = "/dev/disk/by-uuid/cba5b18e-14e6-479d-baf5-0827fced96e7";
-      fsType = "btrfs";
-      options = [ "subvol=persist" ];
-    };
-
-  fileSystems."/var/log" =
-    { device = "/dev/disk/by-uuid/cba5b18e-14e6-479d-baf5-0827fced96e7";
-      fsType = "btrfs";
-      options = [ "subvol=log" ];
-      neededForBoot = true;
-    };
-
-  fileSystems."/boot" =
-    { device = "/dev/disk/by-uuid/5725-D092";
+  fileSystems."/boot" = { 
+      device = "/dev/disk/by-uuid/1FD8-C4B8";
       fsType = "vfat";
-    };
+  };
+
+  fileSystems."/nix" = { 
+      device = "local/nix";
+      fsType = "zfs";
+  };
 
   swapDevices = [ ];
 

systems/persist/common.nix

@@ -0,0 +1,19 @@
+{ impermanence, ... }:
+
+{
+    imports = [
+        impermanence.nixosModules.impermanence
+    ];
+
+    environment.persistence."/nix/persist/common" = {
+        directories = [
+            "/etc/ssh"
+            "/var/lib"
+        ];
+
+        files = [
+            "/etc/machine-id"
+            "/etc/shadow"
+        ];
+    };
+}

systems/persist/qemu-vm.nix

@@ -0,0 +1,7 @@
+{ ... }:
+
+{
+    imports = [
+        ./common.nix
+    ];
+}

systems/qemu-vm.nix

@@ -1,13 +1,18 @@
-{ config, pkgs, ... }:
+{ ... }:
 
 {
     imports = [
+        ./hardware/qemu-vm.nix
         ../sets/meta/sysadmin.nix
         ../packages/vim/package.nix
+        ./common.nix
+        ./persist/qemu-vm.nix
     ];
 
     boot.loader.grub.enable = true;
     boot.loader.grub.device = "/dev/vda";
 
+    networking.hostId = "e78229f8";
+
     time.timeZone = "Europe/Berlin";
 }