nixos/swapspace: add installWrapper option

Signed-off-by: phanirithvij <phanirithvij2000@gmail.com>
Co-authored-by: Luflosi <luflosi@luflosi.de>

nixos/modules/services/system/swapspace.nix

@@ -9,11 +9,27 @@ let
   cfg = config.services.swapspace;
   inherit (lib)
     types
+    mkIf
     mkOption
     mkPackageOption
     mkEnableOption
     ;
-  configFile = pkgs.writeText "swapspace.conf" (lib.generators.toKeyValue { } cfg.settings);
+  inherit (pkgs)
+    makeWrapper
+    runCommand
+    writeText
+    ;
+  configFile = writeText "swapspace.conf" (lib.generators.toKeyValue { } cfg.settings);
+  userWrapper =
+    runCommand "swapspace"
+      {
+        buildInputs = [ makeWrapper ];
+      }
+      ''
+        mkdir -p "$out/bin"
+        makeWrapper '${lib.getExe cfg.package}' "$out/bin/swapspace" \
+          --add-flags "-c '${configFile}'"
+      '';
 in
 {
   options.services.swapspace = {
@@ -28,6 +44,13 @@ in
       ];
       description = "Any extra arguments to pass to swapspace";
     };
+    installWrapper = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        This will add swapspace wrapped with the generated config, to environment.systemPackages
+      '';
+    };
     settings = mkOption {
       type = types.submodule {
         options = {
@@ -92,8 +115,8 @@ in
     };
   };
 
-  config = lib.mkIf cfg.enable {
-    environment.systemPackages = [ cfg.package ];
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ (if cfg.installWrapper then userWrapper else cfg.package) ];
     systemd.packages = [ cfg.package ];
     systemd.services.swapspace = {
       wantedBy = [ "multi-user.target" ];

nixos/tests/swapspace.nix

@@ -1,10 +1,10 @@
 import ./make-test-python.nix (
-  { pkgs, lib, ... }:
+  { lib, ... }:
 
   {
     name = "swapspace";
 
-    meta = with pkgs.lib.maintainers; {
+    meta = with lib.maintainers; {
       maintainers = [
         Luflosi
         phanirithvij
@@ -38,6 +38,9 @@ import ./make-test-python.nix (
       machine.wait_for_unit("swapspace.service")
       machine.wait_for_unit("root-swapfile.swap")
 
+      # ensure swapspace wrapper command runs
+      machine.succeed("swapspace --inspect")
+
       swamp = False
       with subtest("swapspace works"):
         machine.execute("mkdir /root/memfs")