Hi Mark,
Nailed it! Thanks for the fast response, using setsid solves the problem! I’d
like to add this to the wiki but due to some ldap-server fallout, I’m currently
unable to login.
About the Java property org.jenkinsci.plugins.gitclient.USE_SETSID you
mentioned some “compatibility” issues that lead to this property not being set
to true by default. Are there any problems to be expected using setsid?
Thanks,
Jannis
From: [email protected]
[mailto:[email protected]] On Behalf Of Mark Waite
Sent: Wednesday, 2 May, 2018 16:02
To: [email protected]
Subject: Re: Nodes via Headless WebStart: Unable to checkout git repository
using credentials
Since you're running `java -jar agent.jar -jnlpUrl
https://MASTER/computer/SLAVENAME/slave-agent.jnlp -secret SECRET` from a
command line, the ssh command invoked by command line git believes there is a
controlling terminal and prompts on that controlling terminal for the
passphrase.
You can probably prevent that prompt on Linux by adding `setsid` before that
command to launch the JNLP agent. The `setsid` command runs the program in a
new session, detached from the controlling terminal.
The new command would be:
setsid java -jar agent.jar -jnlpUrl
https://MASTER/computer/SLAVENAME/slave-agent.jnlp -secret SECRET
There is a Java property that attempts to force that behavior. For
compatibility purposes, that property defaults to false. You should be able to
set it to true with the additional argument:
-Dorg.jenkinsci.plugins.gitclient.USE_SETSID=true
Mark Waite
On Wed, May 2, 2018 at 7:42 AM Jannis Achstetter
<[email protected]<mailto:[email protected]>>
wrote:
Hi,
I'm facing an issue in a master/slave Jenkins setup. Version of master is
2.89.2, slaves are running Linux.
If a node is connected via the "Launch slave agent via SSH" method, everything
is working as expected.
When I use the "Launch agent via Java Web Start" method and use this command to
connect the node to the master:
java -jar agent.jar -jnlpUrl
https://MASTER/computer/SLAVENAME/slave-agent.jnlp -secret SECRET
the node is connected successfully to the master and jobs are being executed.
The problem arises when a second git repository is to be checked out during
build with this step in our build pipelines:
dir('keys') {
git url:
'[email protected]:ORG/REPO.git', credentialsId: 'MyCredentials'
}
‘MyCredentials’ is a private SSH key with username and passphrase to decrypt
the key, stored in the Jenkins master.
The build times out after waiting 10 minutes for the step to finish with no
relevant info (stack trace + exit code for SIGTERM + no stdout + no stderr) in
the build log. However, on the terminal where the agent.jar was started there
is this output:
May 02, 2018 2:25:05 PM hudson.remoting.jnlp.Main$CuiListener
status
INFO: Connected
Enter passphrase for key '/var/lib/jenkins/workspace/PROJECTNAME':
So it seems that when using the WebStart-method, something is wrong with the
stdin/stdout redirection. In the wiki
(https://wiki.jenkins.io/display/JENKINS/Distributed+builds) it says: “execute
the agent program like java -jar agent.jar, on the right computer, and have its
stdin/stdout connect to your script's stdin/stdout”. I’m not sure if I’m doing
something wrong because all examples for headless just run the java command as
shown above.
Any ideas if this is valid bug, I’m doing something wrong or that scenario is
currently just not supported?
Thanks!
Jannis Achstetter
Technical Engineer Mobility
Innovation & Technology Digitization
Industry Business
Schneider Electric Automation GmbH
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