groovy - Populate choice parameter in jenkinsfile with list of folders in SCM repository

Question

I've got a Jenkinsfile that drives a pipeline which the user must select a specific folder in a bitbucket repo to target. I want that choice parameter dropdown to be dynamically populated.

Currently, I've got the choice param list hardcoded as per this generic example:

choice(name: 'IMAGE', choices: ['workload-x','workload-y','workload-z'])

I wondered if this is possible from within the jenkinsfile itself, or whether I'd have to create a specific groovy script for this then call it. Either way I'm a bit lost as I'm pretty new to jenkins and have only just started working with Jenkinsfiles.

Some trial and error googling has allowed me to create a groovy script which returns an array of folder names in the repository using json slurper:

import groovy.json.JsonSlurper
import jenkins.model.Jenkins

def creds = com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials(
        com.cloudbees.plugins.credentials.Credentials.class,
        Jenkins.instance,
        null,
        null
    );

def credential = creds.find {it.id == "MYBITBUCKETCRED"}

if (!credential) { return "Unable to pickup credential from Jenkins" }
username = credential.username
pass = credential.password.toString()

def urlStr = "https://bitbucket.mydomain.com/rest/api/1.0/projects/MYPROJECT/repos/MYREPO/browse/"

HttpURLConnection conn = (HttpURLConnection) new URL(urlStr).openConnection()
String encoded = Base64.getEncoder().encodeToString((username + ":" + pass).getBytes("UTF-8"));
conn.setRequestProperty("Authorization", "Basic " + encoded);
conn.connect();

def slurper = new JsonSlurper() 
def browseList = slurper.parseText(conn.getInputStream().getText())

def dfList = browseList.children.values.path.name.findAll {it.contains('workload-')}

return dfList

This returns a result as follows:

Result:   [workload-a,workload-b,workload-c,workload-x,workload-y,workload-z]

However I'm unsure how then to call this in my Jenkinsfile in order to populate the dropdown.

Any help would be greatly appreciated.

question from:https://stackoverflow.com/questions/66049517/populate-choice-parameter-in-jenkinsfile-with-list-of-folders-in-scm-repository

Answer 1

you can do it this way (follow my example below) or make use of Active Choice Jenkins Plugins - because It allows some groovy scripting to prepare your choice

Note- The Choice parameter will be available after a first run.

def choiceArray = []
node {
    checkout scm
    def folders = sh(returnStdout: true, script: "ls $WORKSPACE")
    
    folders.split().each {
        //condition to skip files if any
        choiceArray << it
    }
}

pipeline {
    agent any;
    parameters { choice(name: 'CHOICES', choices: choiceArray, description: 'Please Select One') }
    stages {
        stage('debug') {
            steps {
                echo "Selected choice is : ${params.CHOICES}"
            }
        }
    }
}