import net.schmizz.sshj.xfer.InMemorySourceFile;
import net.schmizz.sshj.xfer.scp.SCPFileTransfer;

// allow any host ID and search for pw in JavaX-Secret
static void scpUploadWithMkdirs(S user, S host, fS remotePath, final long length, final InputStream in) ctex {
  final SSHClient client = sshLogin(user, host);
  print("Logged in to SSH server " + user + "@" + host);
  try {
    S remoteDir = dropAfterLastSlash(remotePath);
    if (nempty(remoteDir))
      client.newSFTPClient().mkdirs(remoteDir);
    print("Uploading to on " + user + "@" + host + ": " + remotePath);
    SCPFileTransfer fileTransfer = client.newSCPFileTransfer();
    fileTransfer.upload(new InMemorySourceFile {
      public S getName() { ret "dummy"; }
      public long getLength() { ret length; }
      public InputStream getInputStream() { ret in; }
    }, remotePath);
  } finally {
    sshDisconnect(client);
  }
}

Began life as a copy of #1009981