Jenkins Copy Artifacts from Upstream Job to Downstream and back - jenkins

Question

I have Job A that call to another Job B
Job B know copy from Job A the artifact.
How I can do copy back of another artifact from Job B to Job A?
Job A
//////////
stage('Validation'){
'Binary Scan':{
build job: 'JOB_B'
},
)
}
Job B
/////////
stage('Copy Artifacts from Job A'){
copyArtifacts filter: 'testz.zip',
fingerprintArtifacts: true,
projectName: currentBuild.upstreamBuilds[0].fullProjectName,
selector: upstream()
}
stage('Do something'){
}
stage('Copy Artifacts back to Job A'){
/////?????????
}

Answer 1

From within a project, you can't normally execute arbitrary code into a different project.
What you can do is for the Job B to use archiveArtifacts, and when it completes, the calling job (Job A) can retrieve the artifacts from the instance of Job B it triggered.
The build command will return a job 'handle' that has enough information to let you build a copyArtifacts command.
job A
//////////
stage('Produce artifacts'){
// First, produce some artifacts for Job B and archive them so that they are available to Job B
archiveArtifacts artifacts: "testz.zip"
}
stage('Validation'){
// Invoke Job B (blocks until job B completes)
def jobB = build job: "JOB_B"
// Retrieve artifacts from Job B after it completes
final String artifactsFilter = "build/*.csv"
copyArtifacts filter: artifactsFilter, projectName: "JOB_B", selector: specific("${jobB.number}")
// re-attach the same artifacts to Job A (now that they have been copied back into Job A workspace)
archiveArtifacts artifacts: artifactsFilter
}
Job B
/////////
stage('Copy Artifacts from Job A'){
copyArtifacts filter: 'testz.zip', fingerprintArtifacts: true,
projectName: currentBuild.upstreamBuilds[0].fullProjectName,
selector: upstream()
}
stage('Do something'){
}
stage('Archive Artifacts for Job A'){
// Archive desired artifacts
archiveArtifacts artifacts: "build/**.csv"
}