fix(ci): make ci green (#1409)

src/tools/impl/Shell.ts

@@ -1,3 +1,4 @@
+import { existsSync, statSync } from "node:fs";
 import * as path from "node:path";
 import { getShellEnv } from "./shellEnv.js";
 import { buildShellLaunchers } from "./shellLaunchers.js";
@@ -76,11 +77,13 @@ export async function shell(args: ShellArgs): Promise<ShellResult> {
   }
 
   const timeout = timeout_ms ?? DEFAULT_TIMEOUT;
-  const cwd = workdir
+  const defaultCwd = process.env.USER_CWD || process.cwd();
+  const requestedCwd = workdir
     ? path.isAbsolute(workdir)
       ? workdir
-      : path.resolve(process.env.USER_CWD || process.cwd(), workdir)
-    : process.env.USER_CWD || process.cwd();
+      : path.resolve(defaultCwd, workdir)
+    : defaultCwd;
+  const cwd = isUsableDirectory(requestedCwd) ? requestedCwd : defaultCwd;
 
   const context: SpawnContext = {
     command,
@@ -115,10 +118,9 @@ export async function shell(args: ShellArgs): Promise<ShellResult> {
 
 function buildFallbackCommands(command: string[]): string[][] {
   if (!command.length) return [];
-  const first = command[0];
-  if (!first) return [];
-  if (!isShellExecutableName(first)) return [];
-  const script = extractShellScript(command);
+  const shellIndex = findShellExecutableIndex(command);
+  if (shellIndex === null) return [];
+  const script = extractShellScript(command, shellIndex);
   if (!script) return [];
   const launchers = buildShellLaunchers(script);
   return launchers.filter((launcher) => !arraysEqual(launcher, command));
@@ -132,6 +134,14 @@ function arraysEqual(a: string[], b: string[]): boolean {
   return true;
 }
 
+function isUsableDirectory(candidate: string): boolean {
+  try {
+    return existsSync(candidate) && statSync(candidate).isDirectory();
+  } catch {
+    return false;
+  }
+}
+
 function isShellExecutableName(name: string): boolean {
   const normalized = name.replace(/\\/g, "/").toLowerCase();
   if (/(^|\/)(ba|z|a|da)?sh$/.test(normalized)) {
@@ -149,8 +159,33 @@ function isShellExecutableName(name: string): boolean {
   return false;
 }
 
-function extractShellScript(command: string[]): string | null {
+function isEnvExecutableName(name: string): boolean {
+  const normalized = name.replace(/\\/g, "/").toLowerCase();
+  return normalized === "env" || normalized.endsWith("/env");
+}
+
+function findShellExecutableIndex(command: string[]): number | null {
+  const first = command[0];
+  if (!first) return null;
+  if (isShellExecutableName(first)) return 0;
+  if (!isEnvExecutableName(first)) return null;
+
   for (let i = 1; i < command.length; i += 1) {
+    const token = command[i];
+    if (!token) continue;
+    if (token.startsWith("-")) continue;
+    if (/^[A-Za-z_][A-Za-z0-9_]*=.*/.test(token)) continue;
+    return isShellExecutableName(token) ? i : null;
+  }
+
+  return null;
+}
+
+function extractShellScript(
+  command: string[],
+  shellIndex: number,
+): string | null {
+  for (let i = shellIndex + 1; i < command.length; i += 1) {
     const token = command[i];
     if (!token) continue;
     const normalized = token.toLowerCase();