def userInput
pipeline {
    agent any

    options {
        buildDiscarder(logRotator(numToKeepStr: '10'))
    }

    stages {
        stage('Prepare') {
            steps {
                script {
                    userInput = input(id: 'userInput', message: 'What project will be deployed?', parameters: [[$class     : 'ChoiceParameterDefinition',
                                                                                                                choices    : ['project1', 'project2', 'project3'].join('\n'),
                                                                                                                description: 'Description', name: 'project'],
                                                                                                               [$class: 'TextParameterDefinition', defaultValue: 'x.x.x', description: 'Welche Version soll deployed werden?', name: 'version']
                    ])
                    currentBuild.displayName = "${userInput['project']} ${userInput['version']}"
                }
            }
        }

        stage('Deploy on 02-host') {
            steps {
                // deploy using sh
            }
        }

        stage('Decide Continue Deployment') {
            steps {
                script {
                    env.CONTINUE_DEPLOYMENT = input message: 'Continue with deployment on 01?',
                            parameters: [choice(name: 'Continue Deployment', choices: 'yes\nno', description: 'Choose "yes" to proceed.')]
                }
            }
        }

        stage('Deploy on 01-host') {
            when {
                environment name: 'CONTINUE_DEPLOYMENT', value: 'yes'
            }
            steps {
                // deploy using sh
            }
        }
    }
}