fix(windows): add shell:true to spawn calls and EPERM fallback for rename

- plugin-loader.js: add shell:true to 3 npm spawn calls (ENOENT on Windows)

- taskmaster.js: add shell:true to 6 npx/task-master spawn calls

- CronTaskStore.ts: catch EPERM/EACCES on rename, fallback to copyFile+unlink

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Kaguya-19

src/cron/storage/CronTaskStore.ts

@@ -1,4 +1,4 @@
-import { appendFile, mkdir, readFile, rename, writeFile } from "node:fs/promises";
+import { appendFile, copyFile, mkdir, readFile, rename, unlink, writeFile } from "node:fs/promises";
 import { dirname } from "node:path";
 import type { GatewayEvent } from "../../gateway/index.js";
 import type { CronRunRecord, CronTask } from "../protocol/types.js";
@@ -120,7 +120,17 @@ export class CronTaskStore {
     await mkdir(dirname(this.paths.tasksFile), { recursive: true });
     const tempPath = `${this.paths.tasksFile}.${process.pid}.${Date.now()}.tmp`;
     await writeFile(tempPath, JSON.stringify(file, null, 2), "utf-8");
-    await rename(tempPath, this.paths.tasksFile);
+    try {
+      await rename(tempPath, this.paths.tasksFile);
+    } catch (err: unknown) {
+      const code = (err as NodeJS.ErrnoException).code;
+      if (code === "EPERM" || code === "EACCES") {
+        await copyFile(tempPath, this.paths.tasksFile);
+        await unlink(tempPath).catch(() => {});
+      } else {
+        throw err;
+      }
+    }
   }
 }
 

ui/server/routes/taskmaster.js

@@ -478,7 +478,8 @@ router.get('/next/:projectName', async (req, res) => {
 
             const nextTaskCommand = spawn('task-master', ['next'], {
                 cwd: projectPath,
-                stdio: ['pipe', 'pipe', 'pipe']
+                stdio: ['pipe', 'pipe', 'pipe'],
+                shell: true
             });
 
             let stdout = '';
@@ -998,7 +999,8 @@ router.post('/init/:projectName', async (req, res) => {
         // Run taskmaster init command
         const initProcess = spawn('npx', ['task-master', 'init'], {
             cwd: projectPath,
-            stdio: ['pipe', 'pipe', 'pipe']
+            stdio: ['pipe', 'pipe', 'pipe'],
+            shell: true
         });
 
         let stdout = '';
@@ -1101,7 +1103,8 @@ router.post('/add-task/:projectName', async (req, res) => {
         // Run task-master add-task command
         const addTaskProcess = spawn('npx', args, {
             cwd: projectPath,
-            stdio: ['pipe', 'pipe', 'pipe']
+            stdio: ['pipe', 'pipe', 'pipe'],
+            shell: true
         });
 
         let stdout = '';
@@ -1181,7 +1184,8 @@ router.put('/update-task/:projectName/:taskId', async (req, res) => {
         if (status && Object.keys(req.body).length === 1) {
             const setStatusProcess = spawn('npx', ['task-master-ai', 'set-status', `--id=${taskId}`, `--status=${status}`], {
                 cwd: projectPath,
-                stdio: ['pipe', 'pipe', 'pipe']
+                stdio: ['pipe', 'pipe', 'pipe'],
+                shell: true
             });
 
             let stdout = '';
@@ -1233,7 +1237,8 @@ router.put('/update-task/:projectName/:taskId', async (req, res) => {
 
             const updateProcess = spawn('npx', ['task-master-ai', 'update-task', `--id=${taskId}`, `--prompt=${prompt}`], {
                 cwd: projectPath,
-                stdio: ['pipe', 'pipe', 'pipe']
+                stdio: ['pipe', 'pipe', 'pipe'],
+                shell: true
             });
 
             let stdout = '';
@@ -1332,7 +1337,8 @@ router.post('/parse-prd/:projectName', async (req, res) => {
         // Run task-master parse-prd command
         const parsePRDProcess = spawn('npx', args, {
             cwd: projectPath,
-            stdio: ['pipe', 'pipe', 'pipe']
+            stdio: ['pipe', 'pipe', 'pipe'],
+            shell: true
         });
 
         let stdout = '';

ui/server/utils/plugin-loader.js

@@ -109,6 +109,7 @@ function runBuildIfNeeded(dir, packageJsonPath, onSuccess, onError) {
   const buildProcess = spawn('npm', ['run', 'build'], {
     cwd: dir,
     stdio: ['ignore', 'pipe', 'pipe'],
+    shell: true,
   });
 
   let stderr = '';
@@ -341,6 +342,7 @@ export function installPluginFromGit(url) {
         const npmProcess = spawn('npm', ['install', '--ignore-scripts'], {
           cwd: tempDir,
           stdio: ['ignore', 'pipe', 'pipe'],
+          shell: true,
         });
 
         npmProcess.on('close', (npmCode) => {
@@ -408,6 +410,7 @@ export function updatePluginFromGit(name) {
         const npmProcess = spawn('npm', ['install', '--ignore-scripts'], {
           cwd: pluginDir,
           stdio: ['ignore', 'pipe', 'pipe'],
+          shell: true,
         });
         npmProcess.on('close', (npmCode) => {
           if (npmCode !== 0) {