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Posted to dev@mina.apache.org by "Lyor Goldstein (Jira)" <ji...@apache.org> on 2022/07/07 05:08:00 UTC
[jira] [Commented] (SSHD-1276) How to merge output and error streams of remote process ?
[ https://issues.apache.org/jira/browse/SSHD-1276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563576#comment-17563576 ]
Lyor Goldstein commented on SSHD-1276:
--------------------------------------
You seem to want to read from the combined stream while the command is being executed - that is why I assume you are using the inverted streams. This is not possible due to various reasons. I recommend using the 1st option combined with a {{PipedOutputStream}}:
{code:java}
PipedInputStream mergedInput = new PipedInputStream()
PipedOutputStream mergedOutputStream = new PipedOutputStream(mergedInput);
channelExec.setOut(mergedOutputStream);
channelExec.setErr(mergedOutputStream);
channelExec.open.verify();
...read from mergedInput...
{code}
However, it is much more complicated than this - you need to make sure that you start reading from the input stream +before+ opening the channel otherwise the "pump" thread might block - and that means spawning a thread and killing it once execution is done or there is an exception. This is doable - up to you. However, if all you want is to run a command and then examine its output afterwards I suggest you look into the {{ClientSession#executeRemoteCommand}} method
> How to merge output and error streams of remote process ?
> ---------------------------------------------------------
>
> Key: SSHD-1276
> URL: https://issues.apache.org/jira/browse/SSHD-1276
> Project: MINA SSHD
> Issue Type: Question
> Affects Versions: 2.8.0
> Environment: Java SE 8, Apache NetBeans IDE 8.2
> Reporter: dgü
> Priority: Major
>
> Hello!
> I want to merge output and error streams of remote process as {{java.lang.ProcessBuilder#redirectErrorStream(true)}} does.
> If I set output and error streams;
> {quote}channelExec.setOut(mergedOutputStream);
> channelExec.setErr(mergedOutputStream);
> channelExec.open.verify();
> {quote}
> Then, {{ChannelExec#getInvertedOut()}} and {{ChannelExec#getInvertedErr()}} return {{{}null{}}}.
> If I don't set output and error streams;
> {quote}//channelExec.setOut(mergedOutputStream);
> //channelExec.setErr(mergedOutputStream);
> channelExec.open.verify();
> {quote}
> Then, {{ChannelExec#getInvertedOut()}} and {{ChannelExec#getInvertedErr()}} return not {{{}null{}}}. But, streams are not merged.
> How can I merge output and error streams of remote process ?
> Thanks in advance!
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