From upstream pipeline, how to know on which node has been executed downstream pipeline in parallel job execution

[Vincent SCHMITT]

Hello

I have an upstream scripted pipeline calling in parallel downstream script pipeline.
I would like after the run, that the upstream pipeline know on which slave they have been executed.

Would you know how can we do this?


Upstream pipeline ("pipeline 123"):
import hudson.Util;

node ("master") {
    cleanWs()
    def tc_job_name
    def tc=["tc002","tc003"]
    def branches=[:]  
       
    stage ("phase")   {
        tc_job_name = "subpipeline"   
       
        for (int i = 0; i <= tc.size()-1; i++) {   
            def index = i //if we tried to use i below, it would equal tc.size()-1 in each job execution.
            branches["${tc[index]}"] = {
                    def first_run,job_hudson,build_hudson,build_env
                    first_run = build job: tc_job_name, parameters: [string(name:'dummy', value: "${index}")], description:'${tc[index]}', propagate: false
                   
                    def rawbuild = first_run.getRawBuild()
                    def build_properties = rawbuild.getProperties()
                    def log = build_properties['log']
                   
                    def node = log.tokenize('\n').findAll {it.contains 'Running on'}.each {it}[0].split(" ")[2]
                    echo node
                   
               } // end of branches["${tc[index]}"] definition
        } // for (int i = 0; i <= tc.size()-1; i++)
        parallel branches
    } // stage phase
} // node ("master")

Downstream pipeline ("subpipeline"):

node('only_tc') {
    stage ("test") {
        echo env.NODE_NAME
    }
}

What has been tried:
* In upstream pipeline I have tried to get the owner of the executor launching the downstream pipeline:

tc_job_name ='subpipeline'

first_run=build job: job_name

def build_hudson = first_run.getRawBuild()

def build_properties = build_hudson.getProperties()

def executor = build_properties['executor']

println "Node: "+ executor.getOwner().getCaption()

But it doesn't work with parallelized job execution , it outputs "Master" which is not the jenkins slave executor

* Getting NODE_NAME environment parameter:

tc_job_name ='subpipeline'

first_run=build job: job_name

def build_hudson = first_run.getRawBuild()

 def build_env = build_hudson.getEnvironment()

           println build_env.get("NODE_NAME","no node name")

But the environment variables of a pipeline is not the same as a freestyle job and it has not any NODE_NAME

* Parsing the log environment variable: (see first sample), but it's not the right way to do I guess.

Thanks in advanced !!

Vincent