1 files changed, 74 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/networking/scion/scion-dispatcher.nix b/nixpkgs/nixos/modules/services/networking/scion/scion-dispatcher.nix
new file mode 100644
index 000000000000..bab1ec0a989b
--- /dev/null
+++ b/nixpkgs/nixos/modules/services/networking/scion/scion-dispatcher.nix
@@ -0,0 +1,74 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.scion.scion-dispatcher;
+  toml = pkgs.formats.toml { };
+  defaultConfig = {
+    dispatcher = {
+      id = "dispatcher";
+      socket_file_mode = "0770";
+      application_socket = "/dev/shm/dispatcher/default.sock";
+    };
+    log.console = {
+      level = "info";
+    };
+  };
+  configFile = toml.generate "scion-dispatcher.toml" (defaultConfig // cfg.settings);
+in
+{
+  options.services.scion.scion-dispatcher = {
+    enable = mkEnableOption (lib.mdDoc "the scion-dispatcher service");
+    settings = mkOption {
+      default = { };
+      type = toml.type;
+      example = literalExpression ''
+        {
+          dispatcher = {
+            id = "dispatcher";
+            socket_file_mode = "0770";
+            application_socket = "/dev/shm/dispatcher/default.sock";
+          };
+          log.console = {
+            level = "info";
+          };
+        }
+      '';
+      description = lib.mdDoc ''
+        scion-dispatcher configuration. Refer to
+        <https://docs.scion.org/en/latest/manuals/common.html>
+        for details on supported values.
+      '';
+    };
+  };
+  config = mkIf cfg.enable {
+    # Needed for group ownership of the dispatcher socket
+    users.groups.scion = {};
+
+    # scion programs hardcode path to dispatcher in /run/shm, and is not
+    # configurable at runtime upstream plans to obsolete the dispatcher in
+    # favor of an SCMP daemon, at which point this can be removed.
+    system.activationScripts.scion-dispatcher = ''
+      ln -sf /dev/shm /run/shm
+    '';
+
+    systemd.services.scion-dispatcher = {
+      description = "SCION Dispatcher";
+      after = [ "network-online.target" ];
+      wants = [ "network-online.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        Type = "simple";
+        Group = "scion";
+        DynamicUser = true;
+        BindPaths = [ "/dev/shm:/run/shm" ];
+        ExecStartPre = "${pkgs.coreutils}/bin/rm -rf /run/shm/dispatcher";
+        ExecStart = "${pkgs.scion}/bin/scion-dispatcher --config ${configFile}";
+        Restart = "on-failure";
+        StateDirectory = "scion-dispatcher";
+      };
+    };
+  };
+}
+