Unable to Launch an Agent, getting "received junk text is as follows: stdin: is not a tty"

[Philippe M.]

Hello,

We are facing an issue using Jenkins 2.138.3 and connecting to certain machines (issue occurs with machines in  redhat 7.2, not in 6.4 but not sure it's related).

When we start the agent, we get this error, issue being that ssh gives "stdin: is not a tty"

Full Jenkins log:

SSHLauncher{host='XXX.XXX.X.XXX', port=22, credentialsId='XXXXXXXXXXXXXXXXXXX', jvmOptions='', javaPath='', prefixStartSlaveCmd='', suffixStartSlaveCmd='', launchTimeoutSeconds=210, maxNumRetries=10, retryWaitTime=15, sshHostKeyVerificationStrategy=hudson.plugins.sshslaves.verifiers.KnownHostsFileKeyVerificationStrategy, tcpNoDelay=true, trackCredentials=true}

[12/21/18 16:41:19] [SSH] Opening SSH connection to XXX.XXX.X.XXX:22.

[12/21/18 16:41:19] [SSH] SSH host key matches key in Known Hosts file. Connection will be allowed.

[12/21/18 16:41:19] [SSH] Authentication successful.

SSH connection reports a garbage before a command execution.

Check your .bashrc, .profile, and so on to make sure it is quiet.

The received junk text is as follows:

stdin: is not a tty

 

null

[12/21/18 16:41:20] Launch failed - cleaning up connection

[12/21/18 16:41:20] [SSH] Connection closed.

How can this be fixed, searching for similar issues, I see fixes related to sudoers but we are not sudoing here.

I also found issue could be triggered by Banner , but there is no banner either.

Note that if we try non interactive mode, we have this which explains the issue faced by Jenkins I guess:

ssh -T login@host:

stty: standard input: Inappropriate ioctl for device

stdin: is not a tty

stdin: is not a tty

stdin: is not a tty

I tried to disable in /etc/profile stty if in non interactive mode, it fixed :

stty: standard input: Inappropriate ioctl for device

So I now have:

ssh -T login@host:

stdin: is not a tty

stdin: is not a tty

stdin: is not a tty

But I am stuck here.

Thanks in advance for your help.
Regards

[Mark Waite]

You'll need to remove the entries in the '.profile' and/or '.bashrc' that are doing things which are not allowed in a non-interactive shell.  Either that, or wrap them in conditionals which prevent them from being executed in a non-interactive shell.

Mark Waite

[Philippe M.]

Thanks,

That's what I started to do , but how to find all of them ?

Do you have a tip ?

Thanks

[Mark Waite]

I inserted diagnostic print messages into my bashrc at almost every line so that I could tell exactly which line was causing the problem.  It was a coarse technique that helped me quickly detect the problem commands

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Thanks!

Mark Waite

[Benjamin Primrose]

When you find the interactive statements, you can wrap them in an ‘if [ ! –z “${PS1}” ]’ so they’re only executed when you log in interactively.  Don’t copy/paste that if statement, I’m on microslop so those are wonky quotes.

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[Ivan Fernandez Calvo]

Hi,

Did you check to connect with the user from the command line from the Jenkins instance? try to execute the following command from the Jenkins instance with the same user that you use to run Jenkins

su jenkins

ssh USER@AGENT_HOST ls

ssh -T USER@AGENT_HOST ls

ssh -t USER@AGENT_HOST ls

check the shell used by that user in /etc/passwd

grep USER /etc/passwd

Do you use a key with passphrase or user and password?

Could you try with no host verification strategy?

Could you check the settings in /etc/ssh/sshd_config agent file?

grep -v -e "^#" -e "^$" /etc/ssh/sshd_config