build(mellinoe): add mellinoe to flake with disko and impermanence

systems/hw-mellinoe.nix

@@ -0,0 +1,39 @@
+# 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,
+  ...
+}:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [
+    "xhci_pci"
+    "nvme"
+    "usb_storage"
+    "usbhid"
+    "sd_mod"
+    "rtsx_pci_sdmmc"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  # 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;
+  # networking.interfaces.eth0.useDHCP = lib.mkDefault true;
+  # networking.interfaces.wlp1s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

systems/mellinoe.nix

@@ -0,0 +1,11 @@
+{
+  imports = [
+    ./hw-mellinoe.nix
+    ./modules/common.nix
+    ./modules/desktop.nix
+    ./modules/bootloaders/systemd-boot.nix
+    ./modules/hardware/bluetooth.nix
+  ];
+  networking.hostName = "mellinoe";
+  system.stateVersion = "24.11";
+}

systems/modules/ephemeral-root.nix

@@ -0,0 +1,104 @@
+{ inputs, lib, ... }:
+{
+  imports = [
+    inputs.disko.nixosModules.disko
+    inputs.impermanence.nixosModules.impermanence
+  ];
+  # Disk Partitioning
+  disko.devices.disk.main = {
+    device = "/dev/disk/by-id/nvme-eui.01000000000000008ce38e04019a68ab";
+    type = "disk";
+    content.type = "gpt";
+    content.partitions = {
+      boot = {
+        name = "boot";
+        type = "EF02";
+        size = "1M";
+        priority = 1;
+      };
+      esp = {
+        name = "ESP";
+        type = "EF00";
+        size = "500M";
+        content = {
+          type = "filesystem";
+          format = "vfat";
+          mountpoint = "/boot";
+          mountOptions = [ "umask=0077" ];
+        };
+      };
+      swap = {
+        size = "4G";
+        content = {
+          type = "swap";
+          resumeDevice = true;
+        };
+      };
+      root = {
+        name = "root";
+        size = "100%";
+        content = {
+          type = "lvm_pv";
+          vg = "root_vg";
+        };
+      };
+    };
+  };
+
+  # Logical Volume Set up
+  disko.devices.lvm_vg.root_vg = {
+    type = "lvm_vg";
+    lvs.root = {
+      size = "100%FREE";
+      content = {
+        type = "btrfs";
+        extraArgs = [ "-f" ];
+        subvolumes = {
+          "/root".mountpoint = "/";
+          "/persist".mountpoint = "/persist";
+          "/persist".mountOptions = [
+            "subvol=persist"
+            "noatime"
+          ];
+          "/nix".mountpoint = "/nix";
+          "/nix".mountOptions = [
+            "subvol=nix"
+            "noatime"
+          ];
+        };
+      };
+    };
+  };
+
+  # Back up old roots and delete older ones
+  boot.initrd.postDeviceCommands = lib.mkAfter ''
+    		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/root)" "+%Y-%M-%D_%H:%M:%S")
+    			mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
+    		fi
+
+    		delete_subvolume_recursively() {
+    			IFS=$'\n'
+    			for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
+    				delete_subvolume_recursively "/btrfs_tmp/$i"
+    			done
+    			btrfs subvolume delete "$1"
+    		}
+
+    		for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+    			delete_subvolume_recursively "$i"
+    		done
+
+    		btrfs subvolume create /btrfs_tmp/root
+    		umount /btrfs_tmp
+    	'';
+
+  # Directories to persist between boots
+  fileSystems."/persist".neededForBoot = true;
+  environment.persistence."/persist" = {
+    hideMounts = true;
+  };
+}