add distccd

modules/dynamicism/distccd.nix

@@ -0,0 +1,50 @@
+{ pkgs, lib, config, ... }:
+let
+  cfg = config.services.distccd;
+
+  cliArgs = lib.cli.toCommandLineShellGNU { explicitBool = false; } {
+    no-detach = true;
+    daemon = true;
+    enable-tcp-insecure = true;
+    port = cfg.port;
+
+    # Nulls are handled automatically.
+    job-lifetime = cfg.jobTimeout;
+    log-level = cfg.logLevel;
+    jobs = cfg.maxJobs;
+    nice = cfg.nice;
+    stats = cfg.stats.enable;
+    stats-port = if cfg.stats.enable then cfg.stats.port else null;
+    zeroconf = cfg.zeroconf;
+    allow = cfg.allowedClients;
+  };
+
+  startDistccd = pkgs.writeShellApplication {
+    name = "start-distccd";
+    runtimeInputs = [ pkgs.distccMasquerade ];
+
+    text = ''
+      ${lib.getExe' cfg.package "distccd"} \
+        ${cliArgs}
+    '';
+  };
+in
+{
+  dynamicism.for.distccd = {
+    source-options = [
+      "services.distccd.jobTimeout"
+      "services.distccd.logLevel"
+      "services.distccd.maxJobs"
+      "services.distccd.nice"
+    ];
+    unitDropins."distccd.service" = pkgs.writeTextFile {
+      name = "distccd-override.conf";
+      text = ''
+        [Service]
+        ExecStart=
+        ExecStart=${lib.getExe startDistccd}
+      '';
+      passthru.startScript = startDistccd;
+    };
+  };
+}