How to write in Java on stdin ssh?

Question

Everything works fine on the command line, but when I translate what I want in Java, the retrieval process never gets anything to stdin.

Here is what I have:

private void deployWarFile(File warFile, String instanceId) throws IOException, InterruptedException {
    Runtime runtime = Runtime.getRuntime();
    // FIXME(nyap): Use Jsch.
    Process deployWarFile = runtime.exec(new String[]{
            "ssh",
            "gateway",
            "/path/to/count-the-bytes"});

    OutputStream deployWarFileStdin = deployWarFile.getOutputStream();
    InputStream deployWarFileStdout = new BufferedInputStream(deployWarFile.getInputStream());
    InputStream warFileInputStream = new FileInputStream(warFile);

    IOUtils.copy(warFileInputStream, deployWarFileStdin);
    IOUtils.copy(deployWarFileStdout, System.out);

    warFileInputStream.close();
    deployWarFileStdout.close();
    deployWarFileStdin.close();

    int status = deployWarFile.waitFor();
    System.out.println("************ Deployed with status " + status + " file handles. ************");
}

The script 'count-the-bytes' is simple:

#!/bin/bash

echo "************ counting stdin bytes ************"
wc -c
echo "************ counted stdin bytes ************"

The output indicates that the function hangs on the line "wc -c" - it never falls into the line "counted stdin bytes".

What's happening? Does Jsch use help?

Answer 1

You can try to close the output stream before waiting for wc -c to return.

IOUtils.copy(warFileInputStream, deployWarFileStdin);
deployWarFileStdin.close();
IOUtils.copy(deployWarFileStdout, System.out);

warFileInputStream.close();
deployWarFileStdout.close();

Answer 2

Does Jsch use help?

JSch , setInputStream() setOutputStream() IOUtils.copy, .

ChannelExec deployWarFile = (ChannelExec)session.openChannel("exec");

deployWarFile.setCommand("/path/to/count-the-bytes");

deployWarFile.setOutputStream(System.out);
deployWarFile.setInputStream(new BufferedInputStream(new FileInputStream(warFile)));

deployWarFile.connect();

( - , .)

Runtime.exec ChannelExec ( ), , antlersoft, .. :

ChannelExec deployWarFile = (ChannelExec)session.openChannel("exec");

deployWarFile.setCommand("/path/to/count-the-bytes");

OutputStream deployWarFileStdin = deployWarFile.getOutputStream();
InputStream deployWarFileStdout = new BufferedInputStream(deployWarFile.getInputStream());
InputStream warFileInputStream = new FileInputStream(warFile);

deployWarFile.connect();

IOUtils.copy(warFileInputStream, deployWarFileStdin);
deployWarFileStdin.close();
warFileInputStream.close();

IOUtils.copy(deployWarFileStdout, System.out);
deployWarFileStdout.close();

(, , .)

Answer 3

, , , . JavaDoc

io (.. stdin, stdout, stderr) (Process.getOutputStream(), Process.getInputStream(), Process.getErrorStream()). . , , .

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