Executing groovy scripts on Jenkins' slaves

1
votes

I'm trying to execute a simple groovy script on Jenkins' slaves using the Groovy plugin. I'm using the execute groovy script option and not the execute system groovy script option. I'm also using the "install automatically" (install from groovy website) option of the plugin of the latest version(2.4.6) . However, the job fails and I'm getting this:

Building remotely on .... (...) in workspace C:\Jenkins_Slave\workspace\...
Unpacking https://dl.bintray.com/groovy/maven/apache-groovy-binary-2.4.6.zip to C:\Jenkins_Slave\tools\hudson.plugins.groovy.GroovyInstallation\groovy_2_4_6 on ...
[groovy_reset_dead_slave] $ C:\Jenkins_Slave\tools\hudson.plugins.groovy.GroovyInstallation\groovy_2_4_6\bin\groovy.bat C:\Jenkins_Slave\workspace\...\hudson5850644430171226650.groovy
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
C:\Jenkins_Slave\workspace\...\hudson5850644430171226650.groovy: 5: unable to resolve class jenkins.model.Jenkins
 @ line 5, column 1.
   import jenkins.model.Jenkins
   ^

1 error

Build step 'Execute Groovy script' marked build as failure
Finished: FAILURE

How can I overcome this issue and make it work properly?

2
jenkinsgroovy

2 Answers

0
votes

From the Groovy plugin page:

Groovy Script vs System Groovy Script The plain "Groovy Script" is run in a forked JVM, on the slave where the build is run. It's the basically the same as running the "groovy" command and pass in the script. The system groovy script, OTOH, runs inside the Jenkins master's JVM. Thus it will have access to all the internal objects of Jenkins, so you can use this to alter the state of Jenkins. It is similar to the Jenkins Script Console functionality.

When not using the system Groovy, you do not have Jenkins object in your classpath. You need to make sure the required classes are accessible from the job you are running, and pass them in the "Class path" field of the "execute groovy script" step.

0
votes

import hudson.util.RemotingDiagnostics
import jenkins.model.Jenkins


String agent_name = 'your agent name'

groovy_script = '''
println System.getenv("PATH")
println "uname -a".execute().text
'''.trim()

String result
Jenkins.instance.slaves.find { agent ->
    agent.name == agent_name
}.with { agent ->
    result = RemotingDiagnostics.executeGroovy(groovy_script, agent.channel)
}
println result