Jenkins Job DSL: how to build particular node in Configure block?

Question

The particular thing I want is to prevent some steps from execution in Flexible Publish section. I use a condition of strings (not) matching and I don't want something to be executed after check fails.

Being configured manually, expected step looks like this: Expected postbuild step

As I have not found an appropriate method in Jenkins Jobs DSL API I've tried to reproduce it using the Configure block. The reference says that I can use 'project' for root element of the job and 'node' for particular node to append a child to them. It says also that new nodes won't be created again if pointed nodes exist. So here's my config:

job("flexible_condition") {

  publishers {

    flexiblePublish {
      configure { node ->
          node / publishers /
          'org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher' << 'runner'(class:
          'org.jenkins_ci.plugins.run_condition.BuildStepRunner$DontRun')
        }

      condition {
        not { stringsMatch('string_placeholder', '', false) }
      }

      publisher {
        debianPackage('common') {
          commitMessage('new feature')
        }
      }

      publisher {
        git {
          pushOnlyIfSuccess(true)
          branch('origin', 'master')
        }
      }
    }
  }
}

In spite of the reference desirable xml aren't generated in my jenkins neither in the Playground. I've got nodes duplicated instead and it seems that 'node' is interpreted as 'project' and is always put to the root.

<!-- 1. flexible_condition -->
<project>
    <actions></actions>
    <description></description>
    <keepDependencies>false</keepDependencies>
    <properties></properties>
    <scm class='hudson.scm.NullSCM'></scm>
    <canRoam>true</canRoam>
    <disabled>false</disabled>
    <blockBuildWhenDownstreamBuilding>false</blockBuildWhenDownstreamBuilding>
    <blockBuildWhenUpstreamBuilding>false</blockBuildWhenUpstreamBuilding>
    <triggers class='vector'></triggers>
    <concurrentBuild>false</concurrentBuild>
    <builders></builders>
    <publishers>
        <org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher>
            <runner     class='org.jenkins_ci.plugins.run_condition.BuildStepRunner$DontRun'></runner>
        </org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher>
        <org.jenkins__ci.plugins.flexible__publish.FlexiblePublisher>
            <publishers>
                <org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher>
                    <condition     class='org.jenkins_ci.plugins.run_condition.logic.Not'>
                        <condition     class='org.jenkins_ci.plugins.run_condition.core.StringsMatchCondition'>
                            <arg1>string_placeholder</arg1>
                            <arg2></arg2>
                            <ignoreCase>false</ignoreCase>
                        </condition>
                    </condition>
                    <publisherList>
                        <ru.yandex.jenkins.plugins.debuilder.DebianPackagePublisher>
                            <repoId>common</repoId>
                            <commitMessage>new feature</commitMessage>
                            <commitChanges>true</commitChanges>
                            </ru.yandex.jenkins.plugins.debuilder.DebianPackagePublisher>
                        <hudson.plugins.git.GitPublisher>
                            <configVersion>2</configVersion>
                            <pushMerge>false</pushMerge>
                            <pushOnlyIfSuccess>true</pushOnlyIfSuccess>
                            <forcePush>false</forcePush>
                            <tagsToPush></tagsToPush>
                            <branchesToPush>
                                <hudson.plugins.git.GitPublisher_-BranchToPush>
                                        <targetRepoName>origin</targetRepoName>
                                    <branchName>master</branchName>
                                </hudson.plugins.git.GitPublisher_-BranchToPush>
                            </branchesToPush>
                        </hudson.plugins.git.GitPublisher>
                    </publisherList>
                    <runner class='org.jenkins_ci.plugins.run_condition.BuildStepRunner$Fail'></runner>
                </org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher>
            </publishers>
        </org.jenkins__ci.plugins.flexible__publish.FlexiblePublisher>
    </publishers>
    <buildWrappers></buildWrappers>
</project>

I've been checking this example in the Playground via Job DSL version 1.40 but 1.39 in my jenkins gives the same result.

What am doing wrong?

Thank you.

UPD I've put the configure block below as SevenEleven suggested and it almost helped. The runner node is on the right place now but is still duplicated.

<publishers>
    <org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher>
        <condition .../>
        <publisherList>
            ...
        </publisherList>
        <runner class='org.jenkins_ci.plugins.run_condition.BuildStepRunner$Fail'></runner>
        <runner class='org.jenkins_ci.plugins.run_condition.BuildStepRunner$DontRun'></runner>
    </org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher>
</publishers>

UPD 2 Although there are two different lines in the xml, the newer runner replaces the default one in generated job. So I've got the expected result. Thanks.

UPD 3. Yay! Found out that now one can simply use JobDSL syntax and it works.

publishers {

  flexiblePublish {
    conditionalAction {
      condition {
          not { stringsMatch('string_placeholder', '', false) }
      }

      publishers {
        debianPackage('common') {
          commitMessage('Automatic Commit')
        }
        git {
          pushOnlyIfSuccess(true)
          branch('origin', '$GIT_BRANCH')
        }
      }

      runner('DontRun')
    }
  }
}

Answer 1

To edit the configuration, you have to place the configure-block below, not inside the publishers configuration:

job("flexible_condition") {
    publishers {
        flexiblePublish {
        //...
        }
    }

    configure { 
        it / publishers / 'org.jenkins__ci.plugins.flexible__publish.FlexiblePublisher' / publishers / 'org.jenkins__ci.plugins.flexible__publish.ConditionalPublisher' /  'runner'(class:'org.jenkins_ci.plugins.run_condition.BuildStepRunner$DontRun') {
        }
    }
}