Function defaultIsPathAccessible

src/node/utils/main/resolveLocalPtyShell.ts:43–74

* Check whether a path-like shell candidate is a real executable file. * - Must be a regular file (rejects directories, symlink-to-dir, etc.) * - On POSIX: must have execute permission for the current user. * - On Windows: must have a recognized executable extension (PATHEXT-aware).

(shellPath: string)

 * - On Windows: must have a recognized executable extension (PATHEXT-aware).
 */
function defaultIsPathAccessible(shellPath: string): boolean {
  try {
    const stat = statSync(shellPath);
    if (!stat.isFile()) {
      return false;
    }

    if (process.platform !== "win32") {
      // X_OK checks execute permission for the current user.
      accessSync(shellPath, constants.X_OK);
      return true;
    }

    // On Windows, executable status is determined by file extension.
    const ext = path.win32.extname(shellPath).toLowerCase();
    if (!ext) {
      return false;
    }

    const pathExtEnv = process.env.PATHEXT ?? ".COM;.EXE;.BAT;.CMD";
    const allowedExts = new Set(
      pathExtEnv
        .split(";")
        .map((candidateExt) => candidateExt.toLowerCase().trim())
        .filter(Boolean)
    );

    return allowedExts.has(ext);
  } catch {
    return false;
  }
}

function isPathLikeShell(command: string): boolean {
  return command.includes("/") || command.includes("\\");