Re: [JSch-users] Proper way to detect successful termination on ChannelExec

[Orjan A. <aus...@co...>]

Thanks for the answers. I think I got how to do it now.


=D8rjan

Adam Fanello wrote:
> Yes, I use ChannelExec.
> I read the results from the input steam in a loop until a timeout,
> channel.isEOF(), or a read() returns -1.
> Whether or not the program on the other end succeeded is up to you to
> determine based on its output.
>=20
> --
> Adam Fanello
> Sr. Engineer/Architect
> Intelio Technologies, Inc
>=20
> Orjan Austvold babbled on 01/24/2006 09:37 PM thusly:
>=20
>=20
>>Isn't anyone using ChannelExec?
>>
>>Please respond.
>>
>>
>>Thanks in advance for any help :-)
>>
>>
>>=D8rjan
>>
>>
>>Orjan Austvold wrote:
>>
>>
>>>Hi,
>>>
>>>A remote command executed on a channel seems to hang in some cases.
>>>
>>>Before the command is issued an "scp -t foo.zip /somewhere" has been
>>>issued. The command executed after the scp is a command-line like "cd
>>>/somewhere/.; unzip -o foo.zip; rm -f foo.zip".
>>>
>>>When the foo.zip file size goes beyond 1-2 MB the command hangs...
>>>
>>>What is the proper way to detect that a command has completed
>>>(successfully or in errror)?
>>>
>>>A check for a null return on a readLine() on the error stream of
>>>channel is what causes the hang.
>>>
>>>Thanks in advance for any help :-)
>>>
>>>Here's the code
>>>
>>>    public void executeCommand( String command )
>>>        throws CommandExecutionException
>>>    {
>>>        ChannelExec channel =3D null;
>>>
>>>        InputStream in =3D null;
>>>        InputStream err =3D null;
>>>        OutputStream out =3D null;
>>>        try
>>>        {
>>>            fireTransferDebug( "Executing command: " + command );
>>>
>>>            channel =3D (ChannelExec) session.openChannel( EXEC_CHANNE=
L );
>>>
>>>            channel.setCommand( command + "\n" );
>>>
>>>            out =3D channel.getOutputStream();
>>>
>>>            in =3D channel.getInputStream();
>>>
>>>            err =3D channel.getErrStream();
>>>
>>>            channel.connect();
>>>
>>>            BufferedReader r =3D new BufferedReader( new
>>>InputStreamReader( err ) );
>>>
>>>            List output =3D null;
>>>
>>>            while ( true )
>>>            {
>>>                String line =3D r.readLine();
>>>                if ( line =3D=3D null )
>>>                {
>>>                    break;
>>>                }
>>>
>>>                if ( output =3D=3D null )
>>>                {
>>>                    output =3D new ArrayList();
>>>                }
>>>
>>>                // ignore this error. TODO: output a warning
>>>                if ( !line.startsWith( "Could not chdir to home
>>>directory" ) )
>>>                {
>>>                    output.add( line );
>>>                }
>>>            }
>>>
>>>            if ( output !=3D null && !output.isEmpty() )
>>>            {
>>>                throw new CommandExecutionException(
>>>                    "Exit code: " + channel.getExitStatus() + " - " +
>>>StringUtils.join( output.iterator(), "\n" ) );
>>>            }
>>>        }
>>>        catch ( JSchException e )
>>>        {
>>>            throw new CommandExecutionException( "Cannot execute
>>>remote command: " + command, e );
>>>        }
>>>        catch ( IOException e )
>>>        {
>>>            throw new CommandExecutionException( "Cannot execute
>>>remote command: " + command, e );
>>>        }
>>>        finally
>>>        {
>>>            IOUtil.close( out );
>>>            IOUtil.close( in );
>>>            IOUtil.close( err );
>>>            if ( channel !=3D null )
>>>            {
>>>                channel.disconnect();
>>>            }
>>>        }
>>>    }
>>>
>>>
>>
>>
>>
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>=20
>=20
>=20
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