fix(sync-ui): preserve headless child arguments

src/main/runtime/sync-launcher-client.test.ts

@@ -2,7 +2,11 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import { EventEmitter } from 'node:events';
 import type { SyncProgressEvent } from '../../shared/sync/sync-events';
-import { runSyncLauncher, type SyncLauncherSpawn } from './sync-launcher-client';
+import {
+  runSyncLauncher,
+  sanitizeSyncLauncherEnv,
+  type SyncLauncherSpawn,
+} from './sync-launcher-client';
 
 class FakeChild extends EventEmitter {
   stdout = new EventEmitter();
@@ -214,3 +218,16 @@ test('resolveSyncLauncherCommand self-spawns the app in --sync-cli mode', async
   });
   assert.deepEqual(dev, ['/usr/bin/electron', '/home/u/SubMiner', '--sync-cli']);
 });
+
+test('sanitizeSyncLauncherEnv removes transported parent startup arguments', () => {
+  const parentEnv = {
+    PATH: '/usr/bin',
+    ELECTRON_RUN_AS_NODE: '1',
+    SUBMINER_APP_ARGC: '2',
+    SUBMINER_APP_ARG_0: '--start',
+    SUBMINER_APP_ARG_1: '--background',
+  };
+
+  assert.deepEqual(sanitizeSyncLauncherEnv(parentEnv), { PATH: '/usr/bin' });
+  assert.equal(parentEnv.SUBMINER_APP_ARGC, '2');
+});

src/main/runtime/sync-launcher-client.ts

@@ -26,6 +26,16 @@ export interface SyncLauncherRunHandle {
   done: Promise<SyncLauncherRunResult>;
 }
 
+export function sanitizeSyncLauncherEnv(baseEnv: NodeJS.ProcessEnv): NodeJS.ProcessEnv {
+  const env = { ...baseEnv };
+  delete env.ELECTRON_RUN_AS_NODE;
+  delete env.SUBMINER_APP_ARGC;
+  for (const name of Object.keys(env)) {
+    if (name.startsWith('SUBMINER_APP_ARG_')) delete env[name];
+  }
+  return env;
+}
+
 // Sync runs in a child copy of this app in headless --sync-cli mode: same
 // engine and NDJSON protocol as `subminer sync --json`, with no dependency on
 // bun or an installed command-line launcher. In dev runs process.execPath is
@@ -54,8 +64,7 @@ export function runSyncLauncher(options: {
     ((command, args) => {
       // The child must boot as a full Electron app (its entry handles
       // --sync-cli); a leaked ELECTRON_RUN_AS_NODE would turn it into node.
-      const env = { ...process.env };
-      delete env.ELECTRON_RUN_AS_NODE;
+      const env = sanitizeSyncLauncherEnv(process.env);
       return nodeSpawn(command, args, { stdio: 'pipe', env });
     });
   const [executable, ...prefixArgs] = options.command;