How to wait for user input in a Declarative Pipeline without blocking a heavyweight executor

Question

I\'m rebuilding an existing build pipeline as a jenkins declarative pipeline (multi-branch-pipeline) and have a problem handling build propagation.

After packaging and s

Answer 1

See best practice 7: Don’t: Use input within a node block. In a declarative pipeline, the node selection is done through the agent directive.

The documentation here describes how you can define none for the pipline and then use a stage-level agent directive to run the stages on the required nodes. I tried the opposite too (define a global agent on some node and then define none on stage-level for the input), but that doesn't work. If the pipeline allocated a slave, you can't release the slave for one or more specific stages.

This is the structure of our pipeline:

pipeline {
  agent none
  stages {
    stage('Build') {
      agent { label 'yona' }
      steps {
        ...
      }
    }
    stage('Decide tag on Docker Hub') {
      agent none
      steps {
        script {
          env.TAG_ON_DOCKER_HUB = input message: 'User input required',
              parameters: [choice(name: 'Tag on Docker Hub', choices: 'no\nyes', description: 'Choose "yes" if you want to deploy this build')]
        }
      }
    }
    stage('Tag on Docker Hub') {
      agent { label 'yona' }
      when {
        environment name: 'TAG_ON_DOCKER_HUB', value: 'yes'
      }
      steps {
        ...
      }
    }
  }
}

Generally, the build stages execute on a build slave labeled "yona", but the input stage runs on the master.