CODEWITHSUNDEEP
jenkinsgroovyjenkins-pipeline
vishal
vishal

Reputation: 1874

Jenkins pipeline error in handling json file

I'm newbie to Jenkins pipeline and writing a groovy script to parse a json file. However I'm facing an error which many have faced but none of the solutions worked for me. Below is my Jenkinsfile and error msg.

def envname = readJSON file: '${env.WORKSPACE}/manifest.json'
pipeline {
    agent any
    stages { 
        stage('Build') {
            steps {
                echo WORKSPACE
                sh "ls -a ${WORKSPACE}"
            } 
        }
        }
 }

[Pipeline] Start of Pipeline [Pipeline] readJSON [Pipeline] End of Pipeline org.jenkinsci.plugins.workflow.steps.MissingContextVariableException: Required context class hudson.FilePath is missing Perhaps you forgot to surround the code with a step that provides this, such as: node at org.jenkinsci.plugins.pipeline.utility.steps.AbstractFileOrTextStepExecution.run(AbstractFileOrTextStepExecution.java:30)

I even tried readJSON file: '${WORKSPACE}/manifest.json but that didn't work too. I'm sure the mistake is with the first line since when removing that line, there execution is successful. The docs are pretty helpful but I'm not able to track down where exactly I'm going wrong that is why posted here.

UPDATE:

I tried the following methods def envname = readJSON file: "./manifest.json" and def envname = readJSON file: "${env.WORKSPACE}/manifest.json" and even tried them defining under the steps block. Nothing worked. Below is the error msg I recieved when I defined them under step block

WorkflowScript: 5: Expected a step @ line 7, column 13 def envname = ^

Below is the official syntax doc of readJson and I can see that I'm using the correct syntax only. but still doesn't work as expected. https://www.jenkins.io/doc/pipeline/steps/pipeline-utility-steps/#readjson-read-json-from-files-in-the-workspace

Upvotes: 0

Views: 5753

Answers (2)

vishal
vishal

Reputation: 1874

I've solved this myself with the help of "Matt Schuchard"'s below answer. I'm not sure whether this is the only way to solve but this worked for me.

pipeline {
    agent any
    stages { 
        stage('Json-Build') {
            steps {
                script {
                    def envname = readJSON file: "${env.WORKSPACE}/manifest.json"
                    element1 = "${envname.dev}"
                    echo element1
                }
            } 
        }
        }
 }

Upvotes: 0

Matthew Schuchard
Matthew Schuchard

Reputation: 28749

'${env.WORKSPACE}/manifest.json' is interpolating the Groovy env map as a shell variable. You need to interpolate it as a Groovy variable like "${env.WORKSPACE}/manifest.json".

sh "ls -a ${WORKSPACE}" is interpolating the shell environment variable WORKSPACE as a Groovy variable. You need to interpolate it as a shell variable like sh 'ls -a ${WORKSPACE}'.

echo WORKSPACE is attempting to resolve the shell variable WORKSPACE as a first class Groovy variable expression. You need to use the Groovy env map instead like echo env.WORKSPACE.

As for the global variable indefinite type assignment on the first line: if it still throws the error above after making those fixes, then it may be due to invalid use of scripted syntax in a declarative syntax pipeline. You likely need to place it inside a step block within your pipeline in that case.

Upvotes: 1

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