The function comes originally from this question:
https://groups.google.com/forum/#!topic/jenkinsci-users/L9yP2df9Fz4


2017-01-12 14:50 GMT+01:00 Daniel Beck <[email protected]>:
> What are you trying to accomplish? Pipeline is not intended to perform system 
> management tasks.
>
>> On 12.01.2017, at 14:30, Kristian <[email protected]> wrote:
>>
>> Hi all,
>>
>> I am new to Pipeline and Multibranch. I just wrote a small test
>> pipeline script for a project of me and started it in a Multibranch
>> project. Suddenly I got an error message like this:
>>
>>> org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: 
>>> Scripts not permitted to use staticMethod jenkins.model.Jenkins getInstance
>>
>> After a quick look at Google, I found out, that I can whitelist this
>> at "Manage Jenkins -> In-process Script Approval". I had to do this
>> several times, so now I have this white list:
>>
>>> field hudson.model.Slave name
>>> method hudson.model.AbstractCIBase getNodes
>>> method hudson.model.Node getRootPath
>>> staticMethod jenkins.model.Jenkins getInstance
>>
>> The last function is a problem due to Jenkins / Script Security
>> Plugin, because this function "may have introduced a security
>> vulnerability". I am using the getInstance() function in this
>> function:
>>
>> // **********
>> @NonCPS
>> def nodeRootDir(nodeName) {
>>        for (node in Jenkins.instance.nodes) {
>>                println node.name
>>                if (!nodeName.equals('master') &&
>> node.name.compareTo(nodeName) == 0 ) {
>>                        return node.getRootPath()
>>                        break
>>                }
>>        }
>> }
>> // **********
>>
>> The function retrieves the root path of a slave. The question is: Is
>> there another way to get the root path of a slave in a non-problematic
>> way?
>>
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>
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