machines/Ophanim: migrate to new server

machines/Ophanim/hardware-configuration.nix

@@ -1,36 +1,114 @@
 {
-  nixpkgs,
-  pkgs,
+  lib,
+  modulesPath,
   ...
 }:
+
 {
   imports = [
-    "${nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
+    (modulesPath + "/profiles/qemu-guest.nix")
   ];
 
   boot = {
-    initrd.availableKernelModules = [
-      "ata_piix"
-      "uhci_hcd"
-      "virtio_pci"
-      "sd_mod"
-      "sr_mod"
-    ];
-    kernelPackages = pkgs.linuxPackages_latest;
+    loader.systemd-boot = {
+      enable = true;
+    };
+    loader.efi.canTouchEfiVariables = true;
+    supportedFilesystems = [ "btrfs" ];
+    initrd = {
+      availableKernelModules = [
+        "ata_piix"
+        "uhci_hcd"
+        "virtio_pci"
+        "sr_mod"
+        "virtio_blk"
+      ];
+      kernelModules = [ ];
+    };
     kernelModules = [ ];
     extraModulePackages = [ ];
-    loader.grub = {
-      enable = true;
-      device = "/dev/sda"; # or "nodev" for efi only
-    };
   };
 
+  fileSystems =
+    let
+      btrfsDev = "13d40c4f-baaa-4a17-9032-b25aad202384";
+    in
+    {
+      "/" = {
+        device = "none";
+        fsType = "tmpfs";
+        neededForBoot = true;
+        options = [
+          "defaults"
+          "size=4G"
+          "mode=755"
+          "noexec"
+        ];
+      };
+
+      "/tmp" = {
+        device = "/dev/disk/by-uuid/${btrfsDev}";
+        fsType = "btrfs";
+        options = [
+          "noexec"
+          "noatime"
+          "compress=zstd"
+          "subvol=tmp"
+        ];
+        neededForBoot = true;
+      };
+
+      "/snapshots" = {
+        device = "/dev/disk/by-uuid/${btrfsDev}";
+        fsType = "btrfs";
+        options = [
+          "noexec"
+          "noatime"
+          "compress=zstd"
+          "subvol=snapshots"
+        ];
+        neededForBoot = false;
+      };
+
+      "/persist" = {
+        device = "/dev/disk/by-uuid/${btrfsDev}";
+        fsType = "btrfs";
+        options = [
+          "noexec"
+          "noatime"
+          "compress=zstd"
+          "subvol=persist"
+        ];
+        neededForBoot = true;
+      };
+
+      "/nix" = {
+        device = "/dev/disk/by-uuid/${btrfsDev}";
+        fsType = "btrfs";
+        options = [
+          "noatime"
+          "compress=zstd"
+          "subvol=nix"
+        ];
+        neededForBoot = true;
+      };
+
+      "/boot" = {
+        device = "/dev/disk/by-uuid/5491-80AC";
+        fsType = "vfat";
+        options = [
+          "fmask=0022"
+          "dmask=0022"
+        ];
+      };
+    };
+
+  # 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
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+
   time.timeZone = "Europe/Berlin";
-
-  fileSystems."/" = {
-    device = "/dev/disk/by-uuid/fa0c2ff3-59f9-4c00-8153-c2c2ef0f0e84";
-    fsType = "ext4";
-  };
-
-  swapDevices = [ ];
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 }