[jira] [Commented] (SSHD-1068) ChannelExec not showing the output

["Lyor Goldstein (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SSHD-1068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17186662#comment-17186662 ] 

Lyor Goldstein commented on SSHD-1068:
--------------------------------------

You are closing the channel immediately after calling {{channel.open().verify()}} which means you are "killing" it while the +background+ channel data pumper is attempting to work. Look at the way {{executeRemoteCommand}} works (even if you don't want to use it) - it  waits for the peer to close the channel:

{code:java}
 try (ClientChannel channel = createExecChannel(command)) {
            channel.setOut(channelOut);
            channel.setErr(channelErr);
            channel.open().await();t

            Collection<ClientChannelEvent> waitMask = channel.waitFor(REMOTE_COMMAND_WAIT_EVENTS, 0L);
            if (waitMask.contains(ClientChannelEvent.TIMEOUT)) {
                throw new SocketTimeoutException("Failed to retrieve command result in time: " + command);
            }
}
{code}

> ChannelExec not showing the output
> ----------------------------------
>
>                 Key: SSHD-1068
>                 URL: https://issues.apache.org/jira/browse/SSHD-1068
>             Project: MINA SSHD
>          Issue Type: Question
>    Affects Versions: 2.5.1
>            Reporter: Arpan
>            Priority: Minor
>
> I have just started using apache-mina ssh client and ran into a issue where the command output is not printing. Here is the sample code - 
> {code:java}
> class LibraryBasicTest {
> 	private static final String USER = "luser";
> 	private static final String HOST = "192.168.0.179";
> 	private static final int PORT = 22;
> 	private static final long DEFAULT_CONNECT_TIMEOUT = 3L;
> 	private static final long DEFAULT_AUTH_TIMEOUT = 3L;
> 	private static final long DEFAULT_EXEC_TIMEOUT = 3L;
> 	@Test
> 	void basic_user_pass_ssh_conn_tests() {
> 		SshClient sshClient = SshClient.setUpDefaultClient();
> 		sshClient.start();
> 		ClientSession session = null;
> 		try {
> 			session = sshClient.connect(USER, HOST, PORT).verify(DEFAULT_CONNECT_TIMEOUT, TimeUnit.SECONDS)
> 					.getClientSession();
> 			session.addPasswordIdentity("P@ssw0rd");
> 			session.auth().verify(DEFAULT_AUTH_TIMEOUT, TimeUnit.SECONDS);
> 			
> 			ChannelExec channel = session.createExecChannel("sleep 2;echo \"Hello World!\" \n");
> 			channel.setUsePty(true);
> 			channel.setOut(System.out);
> 			channel.setErr(System.err);
> 			channel.open().verify(DEFAULT_EXEC_TIMEOUT, TimeUnit.SECONDS);
> 		} catch (IOException e) {
> 			e.printStackTrace();
> 		} finally {
> 			if (null != session) {
> 				try {
> 					session.close();
> 				} catch (IOException e) {
> 					e.printStackTrace();
> 				}
> 			}
> 		}
> 		sshClient.stop();
> 	}
> }
> {code}
> What am I missing here ?
> P.S. The below command works though but not planing to use it until it is the only way.
> {code:java}session.executeRemoteCommand("echo \"Hello World!\"");{code} 



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