Fixes #193: Allowing plug overrides

plugos/system.ts

@@ -1,7 +1,8 @@
-import { Hook } from "./types.ts";
+import { Hook, Manifest } from "./types.ts";
 import { EventEmitter } from "./event.ts";
 import type { SandboxFactory } from "./sandbox.ts";
 import { Plug } from "./plug.ts";
+import { deepObjectMerge } from "$sb/lib/json.ts";
 
 export interface SysCallMapping {
   [key: string]: (ctx: SyscallContext, ...args: any) => Promise<any> | any;
@@ -95,11 +96,21 @@ export class System<HookT> extends EventEmitter<SystemEvents<HookT>> {
   async load(
     workerUrl: URL,
     sandboxFactory: SandboxFactory<HookT>,
+    // Mapping plug name -> manifest overrides
+    manifestOverrides?: Record<string, Partial<Manifest<HookT>>>,
   ): Promise<Plug<HookT>> {
     const plug = new Plug(this, workerUrl, sandboxFactory);
 
     // Wait for worker to boot, and pass back its manifest
     await plug.ready;
+
+    if (manifestOverrides && manifestOverrides[plug.manifest!.name]) {
+      plug.manifest = deepObjectMerge(
+        plug.manifest,
+        manifestOverrides[plug.manifest!.name],
+      );
+      console.log("New manifest", plug.manifest);
+    }
     // and there it is!
     const manifest = plug.manifest!;