link lxd preseed to zfs volume

hosts/common/disks/zfs/zspeed.nix

@@ -1,4 +1,16 @@
-{
+{ pkgs
+, lib
+, ...
+}:
+let
+  };
+   In your own system use something like this:
+  import (builtins.fetchGit {
+    url = "https://github.com/nix-community/disko";
+    ref = "master";
+  }) {
+    inherit lib;
+  };{
   disko.devices = {
     disk = {
       x = {
@@ -45,13 +57,13 @@
           "xattr" = "sa";
           "ashift" = "13";
         };
-        mountpoint = "/mnt/zfs";
+        mountpoint = "/mnt/zpool";
         postCreateHook = "zfs list -t snapshot -H -o name | grep -E '^zspeed@blank$' || zfs snapshot zspeed@blank";
 
         datasets = {
           postgres = {
             type = "zfs_volume";
-            size = "10G";
+            size = "10G -s";
             content = {
               type = "filesystem";
               format = "ext4";

hosts/common/optional/lxd/profiles/default.nix

@@ -10,9 +10,9 @@
   };
 
   storage_pool = {
-    name = "test";
-    driver = "zfs";
-    config.source = "zspeed/test";
+    name = "postgres";
+    driver = "disk";
+    config.source = "/mnt/postgres";
   };
 
   profile = {

hosts/nebula/default.nix

@@ -17,6 +17,9 @@ in
       inputs.disko.nixosModules.disko
       (import ../common/disks { device = dev; impermanence = impermanence; fsType = fsType; encrypted = encrypted; })
 
+      # Zfs disk configuration
+      ../common/disks/zfs/zspeed.nix
+
       # Import core options
       ./hardware-configuration.nix
       ../common/core