Make the service name available to the service config

doc/manual/default.nix

@@ -61,7 +61,7 @@ let
             declarations = map (d: "src/nix" + (lib.strings.removePrefix (toString ${src}) (toString d))) opt.declarations;
           };
           inherit (pkgs) lib;
-          composition = pkgs.callPackage ${src}/eval-service.nix {} { modules = []; host = {}; };
+          composition = pkgs.callPackage ${src}/eval-service.nix {} { modules = []; host = {}; name = abort "The manual's service options section must not depend on the service name."; };
       in map fixPaths (lib.filter (opt: opt.visible && !opt.internal) (lib.optionAttrSetToDocList composition.options))
     '';
   };

src/nix/eval-service.nix

@@ -1,6 +1,6 @@
 { lib, pkgs, ... }:
 
-{ modules, host }:
+{ modules, host, name }:
 let
   composite = lib.evalModules {
     check = true;
@@ -21,6 +21,7 @@ let
     key = ./docker-compose.nix;
     config._module.args.pkgs = lib.mkForce pkgs;
     config.host = host;
+    config.service.name = name;
   };
 
 in

src/nix/modules/composition/docker-compose.nix

@@ -11,7 +11,7 @@
  */
 { pkgs, lib, config, ... }:
 let
-evalService = name: modules: (pkgs.callPackage ../../eval-service.nix {} { inherit modules; inherit (config) host; }).config.build.service;
+  evalService = name: modules: (pkgs.callPackage ../../eval-service.nix {} { inherit name modules; inherit (config) host; }).config.build.service;
 
 in
 {

src/nix/modules/service/docker-compose-service.nix

@@ -33,6 +33,14 @@ in
       '';
     };
 
+    service.name = mkOption {
+      type = str;
+      description = ''
+        The name of the service - <code>&lt;name></code> in the composition-level <code>docker-compose.services.&lt;name></code>
+      '';
+      readOnly = true;
+    };
+
     service.volumes = mkOption {
       type = listOf types.unspecified;
       default = [];