Function buildWrapperScript

src/node/runtime/backgroundCommands.ts:51–79

(options: WrapperScriptOptions)

 * Pattern: trap 'echo $? > exit_code' EXIT && cd /path && export K=V && script
 */
export function buildWrapperScript(options: WrapperScriptOptions): string {
  const parts: string[] = [];

  // Set up trap first to capture exit code.
  //
  // IMPORTANT: Do NOT inline shellQuote(exitCodePath) inside a double-quoted trap string.
  // If the path contains a single quote (e.g. processId derived from script contains quotes),
  // shellQuote() will emit the POSIX escape pattern '\''"'"'\'', which contains double quotes
  // and will break the surrounding double quotes.
  //
  // Instead, assign the (quoted) path to a variable and reference it from the trap.
  parts.push(`__MUX_EXIT_CODE_PATH=${shellQuote(options.exitCodePath)}`);
  parts.push(`trap 'echo $? > "$__MUX_EXIT_CODE_PATH"' EXIT`);

  // Change to working directory
  parts.push(`cd ${shellQuote(options.cwd)}`);

  // Add environment variable exports
  if (options.env) {
    for (const [key, value] of Object.entries(options.env)) {
      parts.push(buildShellExport(key, value));
    }
  }

  // Add the actual script
  parts.push(options.script);

  return parts.join(" && ");
}

/**
 * Options for building the spawn command.