How can you edit Build Parameters in Jenkins Workflow?

Question

I know that you can access build parameters directly in the Jenkins Workflow. I have a parameter called BRANCH_REVISION which I need to update so that a call to the xml api will show the new value instead of the original value. This is something I was doing in a non-workflow script using the following groovy snippet:

def currentParamActions = build.getAction(ParametersAction.class)
def currentParams = currentParamActions.getParameters()

currentParams.each() {
    if ( it.name.equals("BRANCH_REVISION") ) {
        newParams.add( new StringParameterValue("BRANCH_REVISION", newRevision ) )
    }
    else {
        newParams.add( it )
    }
}

build.actions.remove(currentParamActions)
new_param_actions = currentParamActions.createUpdated(newParams)
build.actions.add(new_param_actions)

However, it appears that this does not work in Workflow since the build object is not accessible. Thanks in advance for any help!

Answer 1

See <Workflow job configuration> → Workflow → ☑ Snippet Generator → Global variables → Variable: currentBuild:

The currentBuild variable may be used to refer to the currently running build. It is an object similar to that documented for the return value of the build step.

Use currentBuild.build() instead of build in the code in your question according to org.jenkinsci.plugins.workflow.support.steps.build.RunWrapper which is the type of currentBuild.