Convert Jenkins Script to Declarative Pipeline

jenkins

I have a scripted pipeline which I need to checkout from a repo rather than have locally. However, when I add it to git the job fails instantly. Here is the working script;

node {
    INSTANCE_ID = ""

    stage('Get Instance Id') {
        INSTANCE_ID = sh (
            script: 'aws ec2 describe-instances --region=$awsRegion --filters Name=tag:Name,Values=\"$instanceName\" --query \'Reservations[0].Instances[0].InstanceId\'',
            returnStdout: true
        ).trim()

        if (INSTANCE_ID == "") {
            error 'No instance with the name ' + $instanceName + ' was found in the ' + $awsRegion + ' region.'
        }
    }

    stage('Start EC2 Instance') {
        sh ('aws ec2 start-instances --region=$awsRegion --instance-ids ' + INSTANCE_ID)
    }

    stage('Wait for instance to be running') {
        INSTANCE_STATE = sh (
            script: 'aws ec2 describe-instances --region=$awsRegion --instance-id ' + INSTANCE_ID + ' --query \'Reservations[0].Instances[0].State.Name\'',
            returnStdout: true
        ).trim()

        numberOfStatusChecksPerformed = 0
        while (INSTANCE_STATE != '"running"') {
            echo INSTANCE_STATE
            sleep 20
            numberOfStatusChecksPerformed = numberOfStatusChecksPerformed + 1

            // Wait 5 minutes
            if (numberOfStatusChecksPerformed > 15) {
                error 'Instance state was not running, it status is: ' + INSTANCE_STATE
            }

            INSTANCE_STATE = sh (
                script: 'aws ec2 describe-instances --region=$awsRegion --instance-id ' + INSTANCE_ID + ' --query \'Reservations[0].Instances[0].State.Name\'',
                returnStdout: true
            ).trim()
        }
    }
}

I try to convert it by changing; node { to;

#!/usr/bin/env groovy

def INSTANCE_ID = ""

pipeline {
    agent any
    stages {

The rest stays the same. I get the following error;

java.io.FileNotFoundException
    at jenkins.plugins.git.GitSCMFile$3.invoke(GitSCMFile.java:167)
    at jenkins.plugins.git.GitSCMFile$3.invoke(GitSCMFile.java:159)
    at jenkins.plugins.git.GitSCMFileSystem$3.invoke(GitSCMFileSystem.java:193)
    at org.jenkinsci.plugins.gitclient.AbstractGitAPIImpl.withRepository(AbstractGitAPIImpl.java:29)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.withRepository(CliGitAPIImpl.java:72)
    at jenkins.plugins.git.GitSCMFileSystem.invoke(GitSCMFileSystem.java:189)
    at jenkins.plugins.git.GitSCMFile.content(GitSCMFile.java:159)
    at jenkins.scm.api.SCMFile.contentAsString(SCMFile.java:338)
    at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:110)
    at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:67)
    at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:303)
    at hudson.model.ResourceController.execute(ResourceController.java:97)
    at hudson.model.Executor.run(Executor.java:429)
Finished: FAILURE

You don't need to convert to a Declarative Pipeline; just stick with Scripted if it works for you. Generally speaking, it's much more difficult to convert Scripted Pipelines to Declarative Pipelines than the other way around. If you have a working Scripted Pipeline, don't change it at all, just put the working Pipeline script into your Jenkinsfile in your Git repository and it should work just fine.

Convert Jenkins Script to Declarative Pipeline

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