Fix auto-update bun install cwd (#254)

src/hooks/auto-update-checker/index.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, mock, test } from 'bun:test';
+
+mock.module('./constants', () => ({
+  CACHE_DIR: '/mock/cache/opencode',
+  PACKAGE_NAME: 'oh-my-opencode-slim',
+}));
+
+mock.module('./checker', () => ({
+  extractChannel: mock(() => 'latest'),
+  findPluginEntry: mock(() => null),
+  getCachedVersion: mock(() => null),
+  getLatestVersion: mock(async () => null),
+  getLocalDevVersion: mock(() => null),
+}));
+
+mock.module('./cache', () => ({
+  invalidatePackage: mock(() => false),
+}));
+
+mock.module('../../utils/logger', () => ({
+  log: mock(() => {}),
+}));
+
+import { getAutoUpdateInstallDir } from './index';
+
+describe('auto-update-checker/index', () => {
+  test('uses OpenCode cache dir for auto-update installs', () => {
+    expect(getAutoUpdateInstallDir()).toBe('/mock/cache/opencode');
+  });
+});

src/hooks/auto-update-checker/index.ts

@@ -1,6 +1,7 @@
 import type { PluginInput } from '@opencode-ai/plugin';
 import { log } from '../../utils/logger';
 import { invalidatePackage } from './cache';
+import { CACHE_DIR, PACKAGE_NAME } from './constants';
 import {
   extractChannel,
   findPluginEntry,
@@ -8,7 +9,6 @@ import {
   getLatestVersion,
   getLocalDevVersion,
 } from './checker';
-import { PACKAGE_NAME } from './constants';
 import type { AutoUpdateCheckerOptions } from './types';
 
 /**
@@ -142,7 +142,7 @@ async function runBackgroundUpdateCheck(
 
   invalidatePackage(PACKAGE_NAME);
 
-  const installSuccess = await runBunInstallSafe(ctx);
+  const installSuccess = await runBunInstallSafe();
 
   if (installSuccess) {
     showToast(
@@ -167,16 +167,21 @@ async function runBackgroundUpdateCheck(
   }
 }
 
+export function getAutoUpdateInstallDir(): string {
+  return CACHE_DIR;
+}
+
 /**
  * Spawns a background process to run 'bun install'.
  * Includes a 60-second timeout to prevent stalling OpenCode.
  * @param ctx The plugin input context.
  * @returns True if the installation succeeded within the timeout.
  */
-async function runBunInstallSafe(ctx: PluginInput): Promise<boolean> {
+async function runBunInstallSafe(): Promise<boolean> {
   try {
+    const installDir = getAutoUpdateInstallDir();
     const proc = Bun.spawn(['bun', 'install'], {
-      cwd: ctx.directory,
+      cwd: installDir,
       stdout: 'pipe',
       stderr: 'pipe',
     });