Method ext_openssh_lsetstat

lib/protocol/SFTP.js:1502–1562

(path, attrs, cb)

    );
  }
  ext_openssh_lsetstat(path, attrs, cb) {
    if (this.server)
      throw new Error('Client-only method called in server mode');

    const ext = this._extensions['lsetstat@openssh.com'];
    if (ext !== '1')
      throw new Error('Server does not support this extended request');

    let flags = 0;
    let attrsLen = 0;

    if (typeof attrs === 'object' && attrs !== null) {
      attrs = attrsToBytes(attrs);
      flags = attrs.flags;
      attrsLen = attrs.nb;
    } else if (typeof attrs === 'function') {
      cb = attrs;
    }

    /*
      uint32    id
      string    "lsetstat@openssh.com"
      string    path
      ATTRS     attrs
    */
    const pathLen = Buffer.byteLength(path);
    let p = 9;
    const buf =
      Buffer.allocUnsafe(4 + 1 + 4 + 4 + 20 + 4 + pathLen + 4 + attrsLen);

    writeUInt32BE(buf, buf.length - 4, 0);
    buf[4] = REQUEST.EXTENDED;
    const reqid = this._writeReqid = (this._writeReqid + 1) & MAX_REQID;
    writeUInt32BE(buf, reqid, 5);

    writeUInt32BE(buf, 20, p);
    buf.utf8Write('lsetstat@openssh.com', p += 4, 20);

    writeUInt32BE(buf, pathLen, p += 20);
    buf.utf8Write(path, p += 4, pathLen);

    writeUInt32BE(buf, flags, p += pathLen);
    if (attrsLen) {
      p += 4;

      if (attrsLen === ATTRS_BUF.length)
        buf.set(ATTRS_BUF, p);
      else
        bufferCopy(ATTRS_BUF, buf, 0, attrsLen, p);

      p += attrsLen;
    }

    this._requests[reqid] = { cb };

    const isBuffered = sendOrBuffer(this, buf);
    if (this._debug) {
      const status = (isBuffered ? 'Buffered' : 'Sending');