working btrfs impermanence & added lvm to disko

hosts/common/disks/std-disk-config.nix

@@ -19,23 +19,38 @@
                 mountpoint = "/boot";
               };
             };
-            root = {
-              size = "100%";
-              content = {
-                type = "btrfs";
-                extraArgs = [ "-f" ]; # Override existing partition
+          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 = "/";
                   };
 
                   "/persist" = {
-                    mountOptions = [ "compress=zstd" ];
+                    mountOptions = [ "subvol=persist" ];
                     mountpoint = "/persist";
                   };
 
                   "/nix" = {
-                    mountOptions = [ "compress=zstd" "noatime" ];
+                    mountOptions = [ "subvol=nix" "noatime" ];
                     mountpoint = "/nix";
                   };
 

hosts/common/optional/btrfs-impermanence.nix

@@ -1,11 +1,12 @@
+{lib, ...}:
 {
 boot.initrd.postDeviceCommands = lib.mkAfter ''
-    mkdir /btrfs_tmp
-    mount / /btrfs_tmp
+  mkdir /btrfs_tmp
+    mount /dev/root_vg/root /btrfs_tmp
     if [[ -e /btrfs_tmp/root ]]; then
         mkdir -p /btrfs_tmp/old_roots
-        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp)" "+%Y-%m-%-d_%H:%M:%S")
-        mv /btrfs_tmp "/btrfs_tmp/old_roots/$timestamp"
+        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
+        mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
     fi
 
     delete_subvolume_recursively() {

hosts/media/default.nix

@@ -6,6 +6,7 @@
       # Disk configuration
       inputs.disko.nixosModules.disko
       (import ../common/disks/std-disk-config.nix { device = "/dev/vda"; })
+      ../common/optional/btrfs-impermanence.nix
 
       # Import core options
       ./hardware-configuration.nix

hosts/media/hardware-configuration.nix

@@ -10,41 +10,9 @@
 
   boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
   boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-intel" ];
+  boot.kernelModules = [ "kvm-amd" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/" =
-    { device = "/dev/disk/by-uuid/debf250f-70e6-46ef-85b4-c47752bd5ba4";
-      fsType = "btrfs";
-      options = [ "subvol=root" ];
-    };
-
-  fileSystems."/nix" =
-    { device = "/dev/disk/by-uuid/debf250f-70e6-46ef-85b4-c47752bd5ba4";
-      fsType = "btrfs";
-      options = [ "subvol=nix" ];
-    };
-
-  fileSystems."/.swapvol" =
-    { device = "/dev/disk/by-uuid/debf250f-70e6-46ef-85b4-c47752bd5ba4";
-      fsType = "btrfs";
-      options = [ "subvol=swap" ];
-    };
-
-  fileSystems."/persist" =
-    { device = "/dev/disk/by-uuid/debf250f-70e6-46ef-85b4-c47752bd5ba4";
-      fsType = "btrfs";
-      options = [ "subvol=persist" ];
-    };
-
-  fileSystems."/boot" =
-    { device = "/dev/disk/by-uuid/A9BB-DDED";
-      fsType = "vfat";
-      options = [ "fmask=0022" "dmask=0022" ];
-    };
-
-  swapDevices = [ ];
-
   # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
   # (the default) this is the recommended approach. When using systemd-networkd it's
   # still possible to use this option, but it's recommended to use it in conjunction