nixos/dspam: add module

nixos/modules/misc/ids.nix

@@ -243,6 +243,7 @@
       ejabberd = 219;
       postsrsd = 220;
       opendkim = 221;
+      dspam = 222;
 
       # When adding a uid, make sure it doesn't match an existing gid. And don't use uids above 399!
 
@@ -463,6 +464,7 @@
       ejabberd = 219;
       postsrsd = 220;
       opendkim = 221;
+      dspam = 222;
 
       # When adding a gid, make sure it doesn't match an existing
       # uid. Users and groups with the same name should have equal

nixos/modules/module-list.nix

@@ -183,6 +183,7 @@
   ./services/logging/syslogd.nix
   ./services/logging/syslog-ng.nix
   ./services/mail/dovecot.nix
+  ./services/mail/dspam.nix
   ./services/mail/exim.nix
   ./services/mail/freepops.nix
   ./services/mail/mail.nix

nixos/modules/services/mail/dspam.nix

@@ -0,0 +1,147 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.dspam;
+
+  dspam = pkgs.dspam;
+
+  defaultSock = "/run/dspam/dspam.sock";
+
+  cfgfile = pkgs.writeText "dspam.conf" ''
+    Home /var/lib/dspam
+    StorageDriver ${dspam}/lib/dspam/lib${cfg.storageDriver}_drv.so
+
+    Trust root
+    Trust ${cfg.user}
+    SystemLog on
+    UserLog on
+
+    ${optionalString (cfg.domainSocket != null) ''ServerDomainSocketPath "${cfg.domainSocket}"''}
+
+    ${cfg.extraConfig}
+  '';
+
+in {
+
+  ###### interface
+
+  options = {
+
+    services.dspam = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable the dspam spam filter.";
+      };
+
+      user = mkOption {
+        type = types.str;
+        default = "dspam";
+        description = "User for the dspam daemon.";
+      };
+
+      group = mkOption {
+        type = types.str;
+        default = "dspam";
+        description = "Group for the dspam daemon.";
+      };
+
+      storageDriver = mkOption {
+        type = types.str;
+        default = "hash";
+        description =  "Storage driver backend to use for dspam.";
+      };
+
+      domainSocket = mkOption {
+        type = types.nullOr types.path;
+        default = defaultSock;
+        description = "Path to local domain socket which is used for communication with the daemon. Set to null to disable UNIX socket.";
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Additional dspam configuration.";
+      };
+
+      maintenanceInterval = mkOption {
+        type = types.nullOr types.str;
+        default = null;
+        description = "If set, maintenance script will be run at specified (in systemd.timer format) interval";
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable (mkMerge [
+    {
+      users.extraUsers = optionalAttrs (cfg.user == "dspam") (singleton
+        { name = "dspam";
+          group = cfg.group;
+          uid = config.ids.uids.dspam;
+        });
+
+      users.extraGroups = optionalAttrs (cfg.group == "dspam") (singleton
+        { name = "dspam";
+          gid = config.ids.gids.dspam;
+        });
+
+      environment.systemPackages = [ dspam ];
+
+      environment.etc."dspam/dspam.conf".source = cfgfile;
+
+      systemd.services.dspam = {
+        description = "dspam spam filtering daemon";
+        wantedBy = [ "multi-user.target" ];
+        restartTriggers = [ cfgfile ];
+
+        serviceConfig = {
+          ExecStart = "${dspam}/bin/dspam --daemon --nofork";
+          User = cfg.user;
+          Group = cfg.group;
+          RuntimeDirectory = optional (cfg.domainSocket == defaultSock) "dspam";
+          PermissionsStartOnly = true;
+        };
+
+        preStart = ''
+          mkdir -m750 -p /var/lib/dspam
+          chown -R "${cfg.user}:${cfg.group}" /var/lib/dspam
+
+          mkdir -m750 -p /var/log/dspam
+          chown -R "${cfg.user}:${cfg.group}" /var/log/dspam
+        '';
+      };
+    }
+
+    (mkIf (cfg.maintenanceInterval != null) {
+      systemd.timers.dspam-maintenance = {
+        description = "Timer for dspam maintenance script";
+        wantedBy = [ "timers.target" ];
+        timerConfig = {
+          OnCalendar = cfg.maintenanceInterval;
+          Unit = "dspam-maintenance.service";
+        };
+      };
+
+      systemd.services.dspam-maintenance = {
+        description = "dspam maintenance script";
+        restartTriggers = [ cfgfile ];
+
+        serviceConfig = {
+          ExecStart = "${dspam}/bin/dspam_maintenance";
+          Type = "oneshot";
+          User = cfg.user;
+          Group = cfg.group;
+        };
+      };
+    })
+  ]);
+}