Is it possible to update a variable in a dynamically created stage?

['Eric Boehm' via Jenkins Users]

I am having a problem updating a variable based on the result of a shell
script when I create stages dynamically. I think that this is because the
dynamically created stage is a closure and its view of the variable is as
of the time of the closure.

Is there a way to solve this problem?

Here's the sample Jenkinsfile if the stages are run sequentially and not
created dynamically.
It behaves as expected.

node {
    label 'master'
    def needsBuild = []
    myexit = 0
    myscript = """
    echo "Desired exit $myexit"
    exit $myexit
    """
    stage("Status $myexit") {
        status = sh script: myscript, returnStatus: true
        if (status) {
            echo "Changes needed"
            needsBuild.add(myexit)
        }
    }
    myexit = 1
    myscript = """
    echo "Desired exit $myexit"
    exit $myexit
    """
    stage("Status $myexit") {
        status = sh script: myscript, returnStatus: true
        if (status) {
            echo "Changes needed"
            needsBuild.add(myexit)
        }
    }
}

This Jenkinsfile has a traceback when it tries 'needsBuild.add(myexit)

  def createStage(mystatus) {
    def myexit = mystatus
    def myscript = """
    echo "Desired exit $myexit"
    exit $myexit
    """
    return {
        stage("job $myexit") {
            status = sh script: myscript, returnStatus: true
            if (status) {
                echo "Changes needed"
                needsBuild.add(myexit)
            }
        }
    }
}
node {
    label 'master'
    def needsBuild = []
    def stages = [:]
    for (index in [0, 1]) {
        stages["Exit value $index"] = createStage(index)
    }
    parallel stages
}


Here's the traceback:


+ exit 1[Pipeline] echo
<https://bca-bld-013.lvn.broadcom.net:9443/view/all/job/dynamic_stage/9/console#>Changes
needed[Pipeline] }[Pipeline] // stage[Pipeline] }[Pipeline] //
node[Pipeline] End of Pipelinegroovy.lang.MissingPropertyException: No
such property: needsBuild for class: groovy.lang.Binding
        at groovy.lang.Binding.getVariable(Binding.java:63)
        at 
org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetProperty(SandboxInterceptor.java:271)


Any suggestions or guidance on what I am missing would be appreciated.

--
Eric Boehm

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