Monorepo Jenkinsfile and groovy script that will create a Multi-branch pipeline for each project that has a Jenkinsfile within your repository, put at the top level of your repo and create a job in Jenkins that runs the Jenkinsfile. Useful for when you're using a monorepo and have multiple Jenkinsfiles in multiple sub directories. This can still…

Jenkinsfile

pipeline {
    agent {
        label 'docker'
    }

    stages{
        stage('Create jobs'){
            steps{
                container('docker'){
                    script{
                        def files = findFiles(glob: ' **/Jenkinsfile')
                        for (int i = 1; i < files.size(); i++) {
                            echo files[i].name
                            def filePath = files[i].path
                            def pathWithoutFile = filePath.replace('/Jenkinsfile', '')
                            def jobName = "YourPrefix-" + ( pathWithoutFile =~ /([^\/]+)\/?$/)[0][0]
                            echo filePath
                            echo jobName
                            if(Jenkins.instance.getItemMap()[jobName] == null){
                                echo "Job ${jobName} does not exist, creating..."
                                createJob(filePath, jobName)
                            }else{
                                echo "Job ${jobName} already exists."
                            }
                        }
                    }
                }
            }
        }

    }
}

def createJob(filePath, jobName){
        jobDsl  targets: '*.groovy',
        removedJobAction: 'IGNORE',
        removedViewAction: 'IGNORE',
        lookupStrategy: 'JENKINS_ROOT',
        additionalParameters: [jenkinsfile: filePath, Name: jobName]
    
}

pipelineCreator.groovy

// A new UUID must be generated for the first run and re-used for your Job DSL, the plugin updates jobs based on ID
UUID uuid = UUID.fromString("5f8becfc-e881-4ca7-9e5e-06de8acfa15c") // generate one @ https://www.uuidgenerator.net

multibranchPipelineJob("${Name}") {
    displayName "${Name}"
    description "Builds ${Name}"
    configure {
        it / sources / 'data' / 'jenkins.branch.BranchSource' << {
            source(class: 'jenkins.plugins.git.GitSCMSource') {
                id(uuid)
                remote("<Git repo url>")
                credentialsId("<Credentials ID for Git repo>")
                includes('*')
                excludes('')
                ignoreOnPushNotifications('false')
                traits {
                    'jenkins.plugins.git.traits.BranchDiscoveryTrait'()
                }
            }
        }  
        // customise the branch project factory
        it / factory(class: "org.jenkinsci.plugins.workflow.multibranch.WorkflowBranchProjectFactory") << {
            owner(class:"org.jenkinsci.plugins.workflow.multibranch.WorkflowMultiBranchProject", reference: "../..")
            scriptPath("${jenkinsfile}")
        } 
    }
}

Hello!
There is another way to achieve this https://docs.cloudbees.com/docs/cloudbees-ci-kb/latest/client-and-managed-masters/how-to-build-monorepos-in-cloudbees-ci

@mainameiz not quite. If I follow this example it looks like this creates individual jobs for building within the monorepo. The cloudbees example would look to just build everything if it found a change in say the ‘packages’ folder. Now if that folder had 100’s of npm projects I only want to build the one that had an update. @CSTDev am I following your solution correctly? Do you have some screenshots of your generated jobs associated to the monorepo?