// allow any host ID and search for pw in JavaX-Secret
// doesn't do mkdirs
static void scpUpload(S user, S host, fS remotePath, long length, final InputStream in) ctex {
  final SSHClient client = sshLogin(user, host);
  try {
    SCPFileTransfer fileTransfer = client.newSCPFileTransfer();
    fileTransfer.upload(new InMemorySourceFile {
      public S getName() { ret remotePath; }
      public long getLength() { ret length; }
      public InputStream getInputStream() { ret in; }
    }, remotePath);
  } finally {
    client.disconnect();
  }
}