cje-crash-course/exercises/12-basic-jenkinsfile/instructions.md

Exercise 12

In this exercise, you'll create a declarative pipeline for a Go-based project. The Jenkinsfile will use some of the basic features of the pipeline DSL.

Writing a Basic Jenkinsfile

1. Create a new GitHub repository named go-on-jenkins.
2. Create a new Jenkinsfile in the root directory of the repository as well as a simple main.go file. The main function just prints "Hello World!". The repository https://github.com/bmuschko/go-helloworld-template shows an example.
3. Commit the files and push them to the remote repository.
4. Set up a new pipeline job for this repository in Jenkins.
5. Install the Jenkins Go plugin.
6. Configure the latest Go runtime as global tool. Use a name that reflects the Go version. Remember the name for the next step.
7. Enhance the Jenkinsfile based on the following requirements. The Jenkinsfile should use the declarative syntax.
   • The job can run on all agents.
   • The job sets the environment variable GO111MODULES=on.
   • The job uses the Go runtime from the global tool definition (see previous step).
   • The job specifies one build stage named "Build". The build stage executes the shell command go build.