Refactor: Initial step

- Added library for common functions
- Moved machines/ to hosts/
- Automise adding new hosts to the flake

hosts/workstation/hardware-configuration.nix

@@ -0,0 +1,78 @@
+{ config, lib, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/5cc0482e-ac92-41c7-b2fc-2d9b4a19eeec";
+    fsType = "btrfs";
+    options = [ "subvol=root" "compress=zstd" "noatime" ];
+  };
+
+  fileSystems."/nix" = {
+  device = "/dev/disk/by-uuid/5cc0482e-ac92-41c7-b2fc-2d9b4a19eeec";
+    fsType = "btrfs";
+    options = [ "subvol=nix" "compress=zstd" "noatime" ];
+    neededForBoot = true;
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/3012-B13E";
+    fsType = "vfat";
+  };
+
+  fileSystems."/home/hu/mounts/vault" = {
+    device = "/dev/disk/by-uuid/048d175b-0e3e-4ec7-955b-3d9a45f9f237";
+    fsType = "xfs";
+  };
+
+  fileSystems."/home/hu/mounts/attic" = {
+    device = "/dev/disk/by-uuid/ec32ce36-9f53-4f44-ac8f-2c9163f0b3d7";
+    fsType = "xfs";
+  };
+
+  boot.initrd.availableKernelModules = [ 
+    "nvme" "xhci_pci" "ahci" "usbhid" "usb_storage" "sd_mod"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+  boot.extraModprobeConfig = "options kvm_amd nested=1";
+  boot.kernelParams = [
+    "nvidia_drm.fbdev=1"
+    "nvidia.NVreg_PreserveVideoMemoryAllocations=1"
+  ];
+
+  boot.initrd.postDeviceCommands = lib.mkAfter ''
+    mkdir /btrfs_tmp
+    mount ${config.fileSystems."/".device} /btrfs_tmp
+    if [[ -e /btrfs_tmp/root ]]; then
+        mkdir -p /btrfs_tmp/old_roots
+        timestamp=$(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
+  '';
+
+  networking.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}
+