Add the Profile Sync Daemon Package & NixOS Module

nixos/modules/module-list.nix

@@ -137,6 +137,7 @@
   ./services/desktops/gnome3/seahorse.nix
   ./services/desktops/gnome3/sushi.nix
   ./services/desktops/gnome3/tracker.nix
+  ./services/desktops/profile-sync-daemon.nix
   ./services/desktops/telepathy.nix
   ./services/games/ghost-one.nix
   ./services/games/minecraft-server.nix

nixos/modules/services/desktops/profile-sync-daemon.nix

@@ -0,0 +1,139 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.services.psd;
+
+  configFile = ''
+    ${if cfg.users != [ ] then ''
+      USERS="${concatStringsSep " " cfg.users}"
+    '' else ""}
+
+    ${if cfg.browsers != [ ] then ''
+      BROWSERS="${concatStringsSep " " cfg.browsers}"
+    '' else ""}
+
+    ${optionalString (cfg.volatile != "") "VOLATILE=${cfg.volatile}"}
+    ${optionalString (cfg.daemonFile != "") "DAEMON_FILE=${cfg.daemonFile}"}
+  '';
+in {
+  options.services.psd = with types; {
+    enable = mkOption {
+      type = bool;
+      default = false;
+      description = ''
+        Whether to enable the Profile Sync daemon.
+      '';
+    };
+
+    users = mkOption {
+      type = listOf str;
+      default = [ ];
+      example = [ "demo" ];
+      description = ''
+        A list of users whose browser profiles should be sync'd to tmpfs.
+      '';
+    };
+
+    browsers = mkOption {
+      type = listOf str;
+      default = [ ];
+      example = [ "chromium" "firefox" ];
+      description = ''
+        A list of browsers to sync. Available choices are:
+
+        chromium chromium-dev conkeror.mozdev.org epiphany firefox
+        firefox-trunk google-chrome google-chrome-beta google-chrome-unstable
+        heftig-aurora icecat luakit midori opera opera-developer opera-beta
+        qupzilla palemoon rekonq seamonkey
+
+        An empty list will enable all browsers.
+      '';
+    };
+
+    resyncTimer = mkOption {
+      type = str;
+      default = "1h";
+      example = "1h 30min";
+      description = ''
+        The amount of time to wait before syncing browser profiles back to the
+        disk.
+
+        Takes a systemd.unit time span. The time unit defaults to seconds if
+        omitted.
+      '';
+    };
+
+    volatile = mkOption {
+      type = str;
+      default = "/run/psd-profiles";
+      description = ''
+        The directory where browser profiles should reside(this should be
+        mounted as a tmpfs). Do not include a trailing backslash.
+      '';
+    };
+
+    daemonFile = mkOption {
+      type = str;
+      default = "/run/psd";
+      description = ''
+        Where the pid and backup configuration files will be stored.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    systemd = {
+      services = {
+        psd = {
+          description = "Profile Sync daemon";
+          wants = [ "psd-resync.service" "local-fs.target" ];
+          wantedBy = [ "multi-user.target" ];
+          preStart = "mkdir -p ${cfg.volatile}";
+
+          path = with pkgs; [ glibc rsync gawk ];
+
+          unitConfig = {
+            RequiresMountsFor = [ "/home/" ];
+          };
+
+          serviceConfig = {
+            Type = "oneshot";
+            RemainAfterExit = "yes";
+            ExecStart = "${pkgs.profile-sync-daemon}/bin/profile-sync-daemon sync";
+
+            ExecStop = "${pkgs.profile-sync-daemon}/bin/profile-sync-daemon unsync";
+          };
+        };
+
+        psd-resync = {
+          description = "Timed profile resync";
+          after = [ "psd.service" ];
+          wants = [ "psd-resync.timer" ];
+          partOf = [ "psd.service" ];
+
+          path = with pkgs; [ glibc rsync gawk ];
+
+          serviceConfig = {
+            Type = "oneshot";
+            ExecStart = "${pkgs.profile-sync-daemon}/bin/profile-sync-daemon resync";
+          };
+        };
+      };
+
+      timers.psd-resync = {
+        description = "Timer for profile sync daemon - 1 Hour";
+        partOf = [ "psd-resync.service" "psd.service" ];
+
+        timerConfig = {
+          OnUnitActiveSec = "${cfg.resyncTimer}";
+        };
+      };
+    };
+
+    environment.etc."psd.conf".text = configFile;
+
+  };
+}

pkgs/tools/misc/profile-sync-daemon/default.nix

@@ -0,0 +1,32 @@
+{ stdenv, fetchurl, rsync, glibc, gawk }:
+
+stdenv.mkDerivation rec {
+  version = "v5.53";
+  name = "profile-sync-daemon-${version}";
+
+  src = fetchurl {
+    url = "http://github.com/graysky2/profile-sync-daemon/archive/${version}.tar.gz";
+    sha256 = "0m7h9l7dndqgb5k3grpc00f6dpg73p6h4q5sgkf8bvyzvcbdafwx";
+  };
+
+  installPhase = "PREFIX=\"\" DESTDIR=$out make install-systemd-all";
+
+  preferLocalBuild = true;
+
+  meta = with stdenv.lib; {
+    description = "Syncs browser profile dirs to RAM";
+    longDescription = ''
+      Profile-sync-daemon (psd) is a tiny pseudo-daemon designed to manage your
+      browser's profile in tmpfs and to periodically sync it back to your
+      physical disc (HDD/SSD). This is accomplished via a symlinking step and
+      an innovative use of rsync to maintain back-up and synchronization
+      between the two. One of the major design goals of psd is a completely
+      transparent user experience.
+    '';
+    homepage = https://github.com/graysky2/profile-sync-daemon;
+    downloadPage = https://github.com/graysky2/profile-sync-daemon/releases;
+    license = licenses.mit;
+    maintainers = [ maintainers.prikhi ];
+    platforms = platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -2171,6 +2171,8 @@ let
 
   prey-bash-client = callPackage ../tools/security/prey { };
 
+  profile-sync-daemon = callPackage ../tools/misc/profile-sync-daemon { };
+
   projectm = callPackage ../applications/audio/projectm { };
 
   proot = callPackage ../tools/system/proot { };