Declarative Jenkins Pipeline: Passing Variables Between Stages

Introduction

Jenkins Pipeline is a powerful tool for automating software delivery pipelines. The Declarative Pipeline syntax provides a simplified and more opinionated syntax for defining your pipeline. However, passing variables between stages can be a bit tricky. In this article, we will explore how to pass variables between stages in a Declarative Jenkins Pipeline.

Passing Variables Between Stages

In a Declarative Pipeline, variables can be defined using the `environment` directive. These variables can be accessed within the same stage, but cannot be passed between stages directly. To pass variables between stages, we can use the `stash` and `unstash` steps.

The `stash` step allows us to store files or variables in a shared location, which can be accessed by other stages. The `unstash` step allows us to retrieve the stored files or variables.

Here is an example of passing a variable between stages using `stash` and `unstash`:

pipeline {
    agent any
    stages {
        stage('Stage 1') {
            steps {
                script {
                    def myVariable = 'Hello World'
                    stash name: 'myStash', includes: 'myVariable'
                }
            }
        }
        stage('Stage 2') {
            steps {
                script {
                    unstash 'myStash'
                    echo myVariable
                }
            }
        }
    }
}

In this example, we define a variable `myVariable` in Stage 1 and store it in a stash named `myStash`. In Stage 2, we retrieve the stash using `unstash` and echo the value of `myVariable`.

Conclusion

Passing variables between stages in a Declarative Jenkins Pipeline can be achieved using the `stash` and `unstash` steps. By using this approach, we can ensure that our pipeline is more flexible and easier to maintain.