lock beforeAgent of main pipeline agent

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      Hello,
       
      My Jenkins is running in a Kubernetes cluster and all pipelines run in pod.
      I'd like to limit the number of pipelines running in parallel: I'd like an executor limitation like we have when we were running all pipelines in master.
       
      I'm using lockable resources plugin.
      My expecting implementation was something like:
       

      pipeline {
    agent {
        kubernetes {
            label 'test-lock'
            yaml libraryResource('my-pod.yaml')
        }
    }
    options {
        lock(label: 'forge-executor', quantity: 1, variable: 'forgeExecutor')
    }

    stages {
        stage('echo') {
            steps {
                echo "OK"
                script {
                    def outcome = input message: 'Please select', parameters: [
                        [name: 'myChoice', description: 'My choice', choices: 'Choice 1\nChoice 2\nChoice 3', $class: 'ChoiceParameterDefinition']
                    ]
                }
            }
        }
    }
}

       
      OK, the pipeline doesn't execute any stages if it cannot lock, but Kubernetes resources are used.
       
      I try to add when block with beforeAgent option in, but when block is only allowed at stage level.
      So I found a workaround: don't set any main agent and have one top stage with when condition:

      pipeline {
    agent none
    stages {
        stage('lock') {
            agent {
                kubernetes {
                    label 'test-lock'
                    yaml libraryResource('my-pod.yaml')
                }
            }
            when {
                beforeAgent true
                equals(expected: true, actual:true)
            }
            options {
                lock(label: 'forge-executor', quantity: 1, variable: 'forgeExecutor')
            }
            stages {
                stage('echo') {
                    steps {
                        echo "OK"
                        script {
                            def outcome = input message: 'Please select', parameters: [
                                [name: 'myChoice', description: 'My choice', choices: 'Choice 1\nChoice 2\nChoice 3', $class: 'ChoiceParameterDefinition']
                            ]
                        }
                    }
                }
            }
        }
    }
}

      Or more simple

       

      pipeline {
    agent none
    options {
        lock(label: 'forge-executor', quantity: 1, variable: 'forgeExecutor')
    }
    stages {
        stage('lock') {
            agent {
                kubernetes {
                    label 'test-lock'
                    yaml libraryResource('my-pod.yaml')
                }
            }
            stages {
                stage('echo') {
                    steps {
                        echo "OK"
                        script {
                            def outcome = input message: 'Please select', parameters: [
                                [name: 'myChoice', description: 'My choice', choices: 'Choice 1\nChoice 2\nChoice 3', $class: 'ChoiceParameterDefinition']
                            ]
                        }
                    }
                }
            }
        }
    }
}

      IMO, the pipeline should not take any resources if it can lock expected resource and should stay in queue.
       
      Regards,
       
      Arnaud

       

            Assignee:
            Tobias Gruetzmacher
            Reporter:
            Arnaud Bourree
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              Created:
              Updated:
              Resolved: