Function ensureDir

src/node/runtime/RemoteRuntime.ts:473–495

* Ensure a directory exists (mkdir -p semantics).

(dirPath: string, abortSignal?: AbortSignal)

   * Ensure a directory exists (mkdir -p semantics).
   */
  async ensureDir(dirPath: string, abortSignal?: AbortSignal): Promise<void> {
    const stream = await this.exec(`mkdir -p ${this.quoteForRemote(dirPath)}`, {
      cwd: "/",
      timeout: 10,
      abortSignal,
    });

    await stream.stdin.close();

    const [stdout, stderr, exitCode] = await Promise.all([
      streamToString(stream.stdout),
      streamToString(stream.stderr),
      stream.exitCode,
    ]);

    if (exitCode !== 0) {
      const extra = stderr.trim() || stdout.trim();
      throw new RuntimeError(
        `Failed to create directory ${dirPath}: exit code ${exitCode}${extra ? `: ${extra}` : ""}`,
        "file_io"
      );
    }
  }

  /**
   * Get file statistics via exec.