Refactor modules

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/neovim.nix

@@ -0,0 +1,8 @@
+{
+  programs.neovim = {
+    enable = true;
+    defaultEditor = true;
+    viAlias = true;
+    vimAlias = true;
+  };
+}

hosts/common/configs/tmux.nix

@@ -0,0 +1,9 @@
+{
+  programs.tmux = {
+    enable = true;
+    clock24 = true;
+    historyLimit = 10000;
+    keyMode = "vi";
+    newSession = true;
+  };
+}

hosts/common/configs/zsh.nix

@@ -0,0 +1,3 @@
+{
+  programs.zsh.enable = true;
+}

hosts/common/default.nix

@@ -0,0 +1,87 @@
+{ inputs, lib, pkgs, ... }:
+
+{
+  imports = [
+    inputs.impermanence.nixosModules.impermanence
+    ./configs/zsh.nix
+    ./configs/neovim.nix
+    ./configs/tmux.nix
+  ];
+
+  fileSystems."/persist".neededForBoot = true;
+
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      timeout = 0;
+      efi.canTouchEfiVariables = true;
+    };
+
+    initrd = {
+      verbose = false;
+      postDeviceCommands = lib.mkAfter (builtins.readFile ./scripts/impermanence.sh);
+    };
+
+    kernelParams = [ "loglevel=3" "quiet" ];
+    consoleLogLevel = 0;
+  };
+
+  environment = {
+    persistence."/persist" = {
+      hideMounts = true;
+      directories = [
+        "/etc/nixos"
+        "/etc/NetworkManager/system-connections"
+        "/var/lib/nixos"
+        "/var/log"
+        "/var/lib/systemd/coredump"
+      ];
+      files = [
+        "/var/lib/sops-nix/key.txt"
+        "/etc/machine-id"
+        "/root/.zsh_history"
+      ];
+    };
+
+    systemPackages = with pkgs; [
+      nano
+      tree
+      git
+      ranger
+      btop
+      fastfetch
+    ];
+  };
+
+  networking.networkmanager.enable = true;
+  i18n.defaultLocale = "en_US.UTF-8";
+  users.defaultUserShell = pkgs.zsh;
+
+  programs = {
+    nix-ld = {
+      enable = true;
+      libraries = [ ];
+    };
+  };
+
+  security.sudo.extraConfig = ''
+    Defaults lecture = never
+  '';
+
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  system = {
+    autoUpgrade = {
+      enable = true;
+      flake = inputs.self.outPath;
+      flags = [
+        "--update-input"
+        "nixpkgs"
+        "-L"
+      ];
+      dates = "02:00";
+    };
+
+    stateVersion = "24.05";
+  };
+}

hosts/common/scripts/impermanence.sh

@@ -0,0 +1,25 @@
+delete_subvolume_recursively() {
+  IFS=$'\n'
+  for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
+    delete_subvolume_recursively "/mnt/btrfs/$i"
+  done
+  btrfs subvolume delete "$1"
+}
+
+mkdir -p /mnt/btrfs
+mount /dev/mapper/luks /mnt/btrfs
+
+if [[ -e /mnt/btrfs/root ]]; then
+  mkdir -p /mnt/btrfs/root.bak
+  timestamp=$(date --date="@$(stat -c %Y /mnt/btrfs/root)" "+%Y-%m-%-d_%H:%M:%S")
+  mv /mnt/btrfs/root "/mnt/btrfs/root.bak/$timestamp"
+fi
+
+find /mnt/btrfs/root.bak/ -maxdepth 1 -mtime +30 | while IFS= read -r i; do
+  delete_subvolume_recursively "$i"
+done
+
+btrfs subvolume create /mnt/btrfs/root
+
+umount /mnt/btrfs
+rmdir /mnt/btrfs