Linux Question

Im trying to use Jsch to execute a .csh script on a remote server. I am able to execute commands like cp, mv and ls. But when I try to execute a script that internally references some environment variables, the script is exiting with status 1. There is an INTERNAL_ENV_VARIABLE referenced inside script.sh that is not accessible when i run using exec. Is there some way I can run the .csh script from exec that will take care of this dependency ?

Using the shell instead of exec is not an option as there are multiple authentication levels when we open a shell and would make the test framework we are developing, dependent on multiple credentials.

Commands I am calling to navigate to the script directory and execute the script.

util.executeCommand(session,"cd " + script directory+";"+"./script.csh");

console output

com.jcraft.jsch.Channel$MyPipedInputStream@4bff64c2
INTERNAL_ENV_VARIABLE: Undefined variable.
exit-status: 1

Method to Execute the Command : executeCommand

public int executeCommand(Session session, String script) throws JSchException, IOException {
    System.out.println("Execute Script " + script);

    ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
    ((ChannelExec)channelExec).setPty(true);
    InputStream in = channelExec.getInputStream();
    channelExec.setInputStream(null);
    channelExec.setErrStream(System.err);
    channelExec.setCommand(script);
    channelExec.connect();

    byte[] tmp = new byte[1024];
    while (true) {
        while (in.available() > 0) {
            int i = in.read(tmp, 0, 1024);
          System.out.println(channelExec.getErrStream());
            if (i < 0)
                break;
           System.out.print(new String(tmp, 0, i));
        }
        if (channelExec.isClosed()) {
            System.out.println("exit-status: " + channelExec.getExitStatus());

            break;
        }
        try {
            Thread.sleep(1000);
        } catch (Exception ee) {
            System.out.println(ee);
        }
    }

    channelExec.disconnect();
    return channelExec.getExitStatus();


}

Method to Create a Session : createSession

public Session createSession(String user, String  host, int Port, String Password) throws JSchException { 
        JSch jsch = new JSch(); 

        Session session = jsch.getSession(user, host, Port); 
        session.setConfig("StrictHostKeyChecking", "no"); 

        session.setPassword(Password);
        session.connect(5000);
        System.out.println(session.isConnected());
        return session; 
      }
}

Answer

util.executeCommand(session,"cd " + script directory);
util.executeCommand(session,"ls "+"script.csh"+" && exit 0 || exit 1" );
util.executeCommand(session,"./script.csh");

Each of these command invocations will run independently of the others. Notably, each command will start with the same working directory–probably the home directory of whatever user you used to log in–and the cd command that you invoke first won’t have any effect on the other commands that you run.

If you want to string together a sequence of commands, you have to run them in one invocation:

util.executeCommand(session, "cd /some/directory && ./script.csh");

Not able to execute a .csh script using jsch library – Exit 1

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Answer