crashplan: nixos module for backup service

nixos/modules/module-list.nix

@@ -92,6 +92,7 @@
   ./services/audio/mopidy.nix
   ./services/backup/almir.nix
   ./services/backup/bacula.nix
+  ./services/backup/crashplan.nix
   ./services/backup/mysql-backup.nix
   ./services/backup/postgresql-backup.nix
   ./services/backup/rsnapshot.nix

nixos/modules/services/backup/crashplan.nix

@@ -0,0 +1,63 @@
+{ config, pkgs, ... }:
+
+let
+  cfg = config.services.crashplan;
+  crashplan = pkgs.crashplan;
+  varDir = "/var/lib/crashplan";
+in
+
+with pkgs.lib;
+
+{
+  options = {
+    services.crashplan = {
+      enable = mkOption {
+        default = false;
+        type = types.bool;
+        description = ''
+          Starts crashplan background service.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ crashplan ];
+
+    systemd.services.crashplan = {
+      description = "CrashPlan Backup Engine";
+
+      wantedBy = [ "multi-user.target" ];
+      after    = [ "network.target" ];
+
+      preStart = ''
+        ensureDir() {
+          dir=$1
+          mode=$2
+
+          if ! test -e $dir; then
+            ${pkgs.coreutils}/bin/mkdir -m $mode -p $dir
+          elif [ "$(${pkgs.coreutils}/bin/stat -c %a $dir)" != "$mode" ]; then
+            ${pkgs.coreutils}/bin/chmod $mode $dir
+          fi
+        }
+
+        ensureDir ${crashplan.vardir} 755
+        ensureDir ${crashplan.vardir}/conf 700
+        ensureDir ${crashplan.manifestdir} 700
+        ensureDir ${crashplan.vardir}/cache 700
+        ensureDir ${crashplan.vardir}/backupArchives 700
+        ensureDir ${crashplan.vardir}/log 777
+      '';
+
+      serviceConfig = {
+        Type = "forking";
+        EnvironmentFile = "${crashplan}/bin/run.conf";
+        ExecStart = "${crashplan}/bin/CrashPlanEngine start";
+        ExecStop = "${crashplan}/bin/CrashPlanEngine stop";
+        PIDFile = "${crashplan.vardir}/CrashPlanEngine.pid";
+        WorkingDirectory = crashplan;
+      };
+    };
+  };
+}