How to load bash script in Jenkins pipeline?

Question

We have some complex bash script which is now in our managed files section in Jenkins. We try to migrate the job to a pipeline but we don't know enough to translate the bash script to groovy so we want to keep this in bash. We have a jenkins-shared-library in Git in which we store our pipeline templates. Inside the job we add the right environment variables.

We want to keep our bash script in git instead of in the managed files. What is the right way to load this script in the pipeline and execute it? We tried some stuff with libraryResource, but we didn't manage to make it work. Where do we have to put the test.sh script in git and how can we call it? (or is it completely wrong to run a shell script here)

def call(body) {
    // evaluate the body block, and collect configuration into the object
    def pipelineParams= [:]
    body.resolveStrategy = Closure.DELEGATE_FIRST
    body.delegate = pipelineParams
    body()

    pipeline {
        agent any

        options {
            buildDiscarder(logRotator(numToKeepStr: '3'))
        }

        stages {

            stage ('ExecuteTestScript') {
                steps {
                    def script = libraryResource 'loadtestscript?'

                    script {
                        sh './test.sh'
                    }
                }
            }

        }

        post {
            always {
                cleanWs()
            }

        }

    }
}

Answer 1

In my company we also have complex bash scripts in our CI and libraryResource was a better solution. Following your script, you can perform some changes in order to use a bash script stored into libraryResource:

stages {
    stage ('ExecuteTestScript') {
        steps {
            // Load script from library with package path
            def script_bash = libraryResource 'com/example/loadtestscript'

            // create a file with script_bash content
            writeFile file: './test.sh', text: script_bash

            // Run it!
            sh 'bash ./test.sh'
        }
    }
}