Add xdg settings, cache, cleanup script

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

hosts/common/configs/zsh/default.nix

@@ -4,5 +4,8 @@
     histFile = "/var/lib/zsh/history";
   };
 
-  environment.persistence."/persist".directories = [ "/var/lib/zsh" ];
+  environment = {
+    persistence."/persist".directories = [ "/var/lib/zsh" ];
+    pathsToLink = [ "/share/zsh" ];
+  };
 }

hosts/common/default.nix

@@ -12,6 +12,7 @@
     ./configs/nix-ld
     ./configs/git
     ./configs/gpg-agent
+    ./scripts/cleanup
   ];
 
   boot = {
@@ -63,8 +64,13 @@
   };
 
   nix = {
-    settings.experimental-features = [ "nix-command" "flakes" ];
+    settings = {
+      use-xdg-base-directories = true;
+      experimental-features = [ "nix-command" "flakes" ];
+    };
+
     gc.automatic = true;
+    optimise.automatic = true;
   };
 
   nixpkgs.config.allowUnfree = true;

hosts/common/scripts/cleanup/cleanup.sh

@@ -0,0 +1,34 @@
+set -e
+
+if [ "$(id -u)" -ne 0 ]; then
+  echo "This script must be run as root or with sudo privileges."
+  exit 1
+fi
+
+delete_subvolume_recursively() {
+  IFS=$'\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"
+}
+
+if [[ -e /mnt/btrfs && $(mountpoint -q /mnt/btrfs) ]]; then
+  echo "/mnt/btrfs is already mounted. Exiting."
+  exit 1
+fi
+
+mkdir -p /mnt/btrfs
+mount /dev/mapper/luks /mnt/btrfs
+
+if [[ -e /mnt/btrfs/root.bak ]]; then
+  for i in /mnt/btrfs/root.bak/*; do
+    delete_subvolume_recursively "$i"
+  done
+fi
+
+umount /mnt/btrfs
+rmdir /mnt/btrfs
+
+nix-collect-garbage -d
+nix-store --gc -v

hosts/common/scripts/cleanup/default.nix

@@ -0,0 +1,5 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = [ (pkgs.writeShellScriptBin "nix-cleanup" (builtins.readFile ./cleanup.sh)) ];
+}

hosts/eirene/base/default.nix

@@ -11,7 +11,6 @@
   networking.hostName = "eirene";
 
   # https://github.com/NixOS/nixos-hardware/tree/master/lenovo/legion/16achg6
-
   hardware = {
     cpu.amd.updateMicrocode = true;
 

hosts/eirene/format.nix

@@ -58,6 +58,10 @@
                     mountpoint = "/nix";
                     mountOptions = ["subvol=nix" "compress=zstd" "noatime"];
                   };
+                  "/cache" = {
+                    mountpoint = "/cache";
+                    mountOptions = ["subvol=cache" "compress=zstd" "noatime"];
+                  };
                 };
               };
             };

users/common/configs/persist/default.nix

@@ -6,25 +6,20 @@ in {
   programs.fuse.userAllowOther = lib.mkIf (users != [ ]) true;
 
   systemd.tmpfiles.rules = lib.mkIf (users != [ ]) (
-    [ "d /persist/home 0755 root root -" ] ++
-    lib.attrsets.mapAttrsToList (user: config: "d /persist${config.home} 0700 ${user} users -") users
+    [
+      "d /persist/home 0755 root root -"
+      "d /cache/home 0755 root root -"
+    ] ++
+    lib.attrsets.mapAttrsToList (user: config: "d /persist${config.home} 0700 ${user} users -") users ++
+    lib.attrsets.mapAttrsToList (user: config: "d /cache${config.home} 0700 ${user} users -") users
   );
 
   home-manager.users = lib.attrsets.mapAttrs (user: config: ({
     imports = [ inputs.impermanence.nixosModules.home-manager.impermanence ];
 
-    home.persistence."/persist${config.home}" = {
-      allowOther = true;
-      directories = [
-        "Documents"
-        "Downloads"
-        "Music"
-        "Pictures"
-        "Videos"
-        "Templates"
-        "VMs"
-        "git"
-      ];
+    home.persistence = {
+      "/persist${config.home}".allowOther = true;
+      "/cache${config.home}".allowOther = true;
     };
   })) users;
 }

users/common/configs/xdg/default.nix

@@ -0,0 +1,44 @@
+{ config, lib, ... }:
+
+let
+  users = lib.attrsets.filterAttrs (name: config: config.isNormalUser) config.users.users;
+in {
+  home-manager.users = lib.attrsets.mapAttrs (user: cfg: (let
+    cacheHome = "${cfg.home}/.cache";
+    configHome = "${cfg.home}/.config";
+    dataHome = "${cfg.home}/.local/share";
+    stateHome = "${cfg.home}/.local/state";
+    xdgVmDir = "${cfg.home}/VMs";
+    xdgGitDir = "${cfg.home}/git";
+  in {
+    xdg = {
+      enable = true;
+      mimeApps.enable = true;
+
+      inherit cacheHome;
+      inherit configHome;
+      inherit dataHome;
+      inherit stateHome;
+
+      userDirs = {
+        enable = true;
+        extraConfig = {
+          XDG_VM_DIR = xdgVmDir;
+          XDG_GIT_DIR = xdgGitDir;
+        };
+      };
+    };
+
+    home.persistence."/persist${cfg.home}".directories = [
+      "Desktop"  # userDirs.desktop
+      "Documents"  # userDirs.documents
+      "Downloads"  # userDirs.download
+      "Music"  # userDirs.music
+      "Pictures"  # userDirs.pictures
+      "Templates"  # userDirs.templates
+      "Videos"  # userDirs.videos
+      "VMs"  # xdgVmDir
+      "git"  # xdgGitDir
+    ];
+  })) users;
+}

users/common/default.nix

@@ -1,4 +1,4 @@
-{ inputs, ... }:
+{ config, inputs, ... }:
 
 {
   imports = [
@@ -6,6 +6,7 @@
     ./options.nix
     ./configs/persist
     ./configs/sops
+    ./configs/xdg
   ];
 
   home-manager = {
@@ -15,6 +16,7 @@
     sharedModules = [{
       home.stateVersion = "24.05";
       systemd.user.startServices = "sd-switch";
+      nix.settings = config.nix.settings;
     }];
   };
 

users/configs/firefox/default.nix

@@ -88,6 +88,9 @@
       };
     };
 
-    home.persistence."/persist${user.home}".directories = [ ".mozilla" ];
+    home.persistence = {
+      "/persist${user.home}".directories = [ ".mozilla" ];
+      "/cache${user.home}".directories = [ ".cache/mozilla" ];
+    };
   };
 }

users/configs/git/default.nix

@@ -1,6 +1,8 @@
-{ user ? throw "user argument is required" }: { pkgs, ... }:
+{ user ? throw "user argument is required" }: { config, pkgs, ... }:
 
-{
+let
+  hmConfig = config.home-manager.users."${user.name}";
+in {
   home-manager.users."${user.name}" = {
     programs.git = {
       enable = true;
@@ -14,7 +16,7 @@
       extraConfig.credential.helper = "store";
       hooks = let
         commit-msg-hook = pkgs.writeShellScriptBin "git-commit-msg" ''
-          git interpret-trailers --if-exists doNothing --trailer \
+          ${pkgs.git}/bin/git interpret-trailers --if-exists doNothing --trailer \
             "Signed-off-by: $(git config user.name) <$(git config user.email)>" \
             --in-place "$1"
         '';
@@ -22,5 +24,7 @@
         commit-msg = "${commit-msg-hook}/bin/git-commit-msg";
       };
     };
+
+    sops.secrets."git".path = "${hmConfig.xdg.configHome}/git/credentials";
   };
 }

users/configs/gpg-agent/default.nix

@@ -1,7 +1,16 @@
-{ user ? throw "user argument is required" }: { pkgs, ... }:
+{ user ? throw "user argument is required" }: { config, lib, pkgs, ... }:
 
+let
+  hmConfig = config.home-manager.users."${user.name}";
+  gpgPath = "${hmConfig.xdg.dataHome}/gnupg";
+in
 {
   home-manager.users."${user.name}" = {
+    programs.gpg = {
+      enable = true;
+      homedir = gpgPath;
+    };
+
     services.gpg-agent = {
       enable = true;
       defaultCacheTtl = 31536000;
@@ -11,22 +20,24 @@
     systemd.user = {
       services.gpg-agent-import = let
         init = pkgs.writeShellScriptBin "import-gpg-keys" ''
+          export GNUPGHOME=${gpgPath}
+
           for keyfile in "${user.home}"/.config/sops-nix/secrets/gpg-agent/*.key; do
             passfile="''${keyfile%.key}.pass"
 
             if [ -f "$passfile" ]; then
-              gpg --batch --yes --pinentry-mode loopback --passphrase-file "$passfile" --import "$keyfile"
+              ${pkgs.gnupg}/bin/gpg2 --batch --yes --pinentry-mode loopback --passphrase-file "$passfile" --import "$keyfile"
             else
-              gpg --batch --yes --import "$keyfile"
+              ${pkgs.gnupg}/bin/gpg2 --batch --yes --import "$keyfile"
             fi
 
-            gpg --with-colons --import-options show-only --import "$keyfile" | grep '^fpr' | cut -d: -f10 | while read -r KEY_ID; do
-              echo "$KEY_ID:6:" >> "${user.home}"/.gnupg/otrust.txt
+            ${pkgs.gnupg}/bin/gpg2 --with-colons --import-options show-only --import "$keyfile" | grep '^fpr' | cut -d: -f10 | while read -r KEY_ID; do
+              echo "$KEY_ID:6:" >> "${gpgPath}"/otrust.txt
             done
           done
 
-          gpg --import-ownertrust "${user.home}"/.gnupg/otrust.txt
-          rm "${user.home}"/.gnupg/otrust.txt
+          ${pkgs.gnupg}/bin/gpg2 --import-ownertrust "${gpgPath}"/otrust.txt
+          rm "${gpgPath}"/otrust.txt
         '';
       in {
         Unit = {
@@ -43,7 +54,12 @@
         Install = { WantedBy = [ "default.target" ]; };
       };
 
-      tmpfiles.rules = [ "d ${user.home}/.gnupg 0700 ${user.name} users -" ];
+      tmpfiles.rules = [ "d ${hmConfig.xdg.dataHome}/gnupg 0700 ${user.name} users -" ];
+    };
+
+    sops.secrets = {
+      "gpg-agent/pgp.key" = { };
+      "gpg-agent/pgp.pass" = { };
     };
   };
 }

users/configs/gtk/default.nix

@@ -0,0 +1,10 @@
+{ user ? throw "user argument is required" }: { config, ... }:
+
+let
+  hmConfig = config.home-manager.users."${user.name}";
+in
+{
+  home-manager.users."${user.name}" = {
+    gtk.gtk2.configLocation = "${hmConfig.xdg.configHome}/gtk-2.0/gtkrc";
+  };
+}

users/configs/hyprland/default.nix

@@ -1,5 +1,8 @@
-{ user ? throw "user argument is required" }: { lib, pkgs, ... }:
+{ user ? throw "user argument is required" }: { config, lib, pkgs, ... }:
 
+let
+  hmConfig = config.home-manager.users."${user.name}";
+in
 {
   programs.hyprland.enable = true;
 
@@ -8,12 +11,12 @@
       enable = true;
       settings = {
         "$mod" = "SUPER";
-        "$term" = "kitty";
+        "$term" = "${pkgs.kitty}/bin/kitty";
 
         bind = [
           "$mod, Return, exec, $term"
-          "$mod, r, exec, rofi -show drun"
-          "$mod, b, exec, firefox"
+          "$mod, r, exec, ${pkgs.rofi-wayland}/bin/rofi -cache-dir ${hmConfig.xdg.cacheHome}/rofi -show drun"
+          "$mod, b, exec, ${pkgs.firefox}/bin/firefox"
 
           "$mod, 1, workspace, 1"
           "$mod, 2, workspace, 2"
@@ -116,9 +119,8 @@
 
     home = {
       sessionVariables.NIXOS_OZONE_WL = "1";
+
       packages = with pkgs; [
-        swww
-        rofi-wayland
         pavucontrol
       ];
     };

users/configs/kitty/default.nix

@@ -8,5 +8,7 @@
         confirm_os_window_close 0
       '';
     };
+
+    home.persistence."/cache${user.home}".directories = [ ".cache/kitty" ];
   };
 }

users/configs/rofi/default.nix

@@ -0,0 +1,10 @@
+{ user ? throw "user argument is required" }: { pkgs, ... }:
+
+{
+  home-manager.users."${user.name}" = {
+    home = {
+      packages = with pkgs; [ rofi-wayland ];
+      persistence."/cache${user.home}".directories = [ ".cache/rofi" ];
+    };
+  };
+}

users/configs/swww/default.nix

@@ -0,0 +1,10 @@
+{ user ? throw "user argument is required" }: { pkgs, ... }:
+
+{
+  home-manager.users."${user.name}" = {
+    home = {
+      packages = with pkgs; [ swww ];
+      persistence."/cache${user.home}".directories = [ ".cache/swww" ];
+    };
+  };
+}

users/configs/vscode/default.nix

@@ -1,6 +1,22 @@
-{ user ? throw "user argument is required" }: { pkgs, ... }:
+{ user ? throw "user argument is required" }: { inputs, lib, pkgs, ... }:
 
-{
+let
+  configDir = ".config/Code";
+  cacheDirs = [
+    ".config/Code/Cache"
+    ".config/Code/CachedConfigurations"
+    ".config/Code/CachedData"
+    ".config/Code/CachedExtensionVSIXs"
+    ".config/Code/CachedExtensions"
+    ".config/Code/CachedProfilesData"
+    ".config/Code/Code Cache"
+    ".config/Code/DawnCache"
+    ".config/Code/GPUCache"
+    ".config/Code/Service Worker/CacheStorage"
+    ".config/Code/Service Worker/ScriptCache"
+  ];
+  inherit (pkgs.callPackage "${inputs.impermanence}/lib.nix" { }) sanitizeName concatPaths;
+in {
   home-manager.users."${user.name}" = {
     programs.vscode = {
       enable = true;
@@ -59,6 +75,28 @@
       ./langs/nix.nix
     ];
 
-    home.persistence."/persist${user.home}".directories = [ ".config/Code" ];
+    home.persistence = {
+      "/persist${user.home}".directories = [ configDir ];
+      # Bastard: https://github.com/microsoft/vscode/issues/3884
+      "/cache${user.home}".directories = cacheDirs;
+    };
+
+    # Some filthy fucking shit below, be warned.
+    # Microsoft stores cache under .config/Code instead of .cache/Code like normal people.
+    # Sometimes a race condition is caused if the cache bind mounts are created before the config one.
+    # So we do this. Sorry.
+    # https://github.com/nix-community/impermanence/blob/27979f1c3a0d3b9617a3563e2839114ba7d48d3f/home-manager.nix#L238
+    systemd.user.services = let
+      configDirService = "bindMount-${sanitizeName (lib.strings.escapeShellArg (concatPaths [ "/persist${user.home}" configDir ]))}.service";
+    in
+    builtins.listToAttrs (builtins.map (dir: {
+      name = "bindMount-${sanitizeName (lib.strings.escapeShellArg (concatPaths [ "/cache${user.home}" dir ]))}";
+      value = {
+        Unit = {
+          Requires = [ configDirService ];
+          After = [ configDirService ];
+        };
+      };
+    }) cacheDirs);
   };
 }

users/configs/x/default.nix

@@ -0,0 +1,10 @@
+{ user ? throw "user argument is required" }: { config, ... }:
+
+let
+  hmConfig = config.home-manager.users."${user.name}";
+in
+{
+  home-manager.users."${user.name}" = {
+    xresources.path = "${hmConfig.xdg.configHome}/X11/xresources";
+  };
+}

users/configs/zsh/default.nix

@@ -4,6 +4,7 @@
   home-manager.users."${user.name}" = {
     programs.zsh = {
       enable = true;
+      dotDir = ".config/zsh";
       autocd = true;
       history = {
         path = "${user.home}/.local/share/zsh/history";

users/nick/default.nix

@@ -8,8 +8,12 @@ in
     ./nogui.nix
     (import ../configs/firefox { inherit user; })
     (import ../configs/hyprland { inherit user; })
+    (import ../configs/rofi { inherit user; })
+    (import ../configs/swww { inherit user; })
     (import ../configs/kitty { inherit user; })
     (import ../configs/vscode { inherit user; })
+    (import ../configs/gtk { inherit user; })
+    (import ../configs/x { inherit user; })
     (import ../configs/stylix { inherit user; })
   ];
 

users/nick/nogui.nix

@@ -2,8 +2,7 @@
 
 let
   user = config.users.users.nick;
-in
-{
+in {
   imports = [
     ../common
     (import ../configs/zsh { inherit user; })
@@ -23,7 +22,7 @@ in
     home = "/home/nick";
     email = "nick@karaolidis.com";
     fullName = "Nikolaos Karaolidis";
-    description = config.users.users.nick.fullName;
+    description = user.fullName;
     hashedPasswordFile = config.sops.secrets.nick-password.path;
     extraGroups = [ "wheel" ];
     linger = true;
@@ -31,14 +30,7 @@ in
   };
 
   home-manager.users.nick = {
-    home.homeDirectory = config.users.users.nick.home;
-    sops = {
-      defaultSopsFile = ./secrets/secrets.yaml;
-      secrets = {
-        "git" = { path = "/home/nick/.git-credentials"; };
-        "gpg-agent/pgp.key" = { };
-        "gpg-agent/pgp.pass" = { };
-      };
-    };
+    home.homeDirectory = user.home;
+    sops.defaultSopsFile = ./secrets/secrets.yaml;
   };
 }