Branch selection and branch specifier in Jenkins - Mini Project: Build & Apply

Branch selection and branch specifier

📖 Scenario: You are setting up a Jenkins pipeline to build code from a specific branch in a Git repository. You want to practice selecting branches using branch specifiers in your pipeline configuration.

🎯 Goal: Build a Jenkins pipeline script that checks out code from a Git repository using a branch specifier to select the feature/login branch.

📋 What You'll Learn

Create a variable to hold the Git repository URL.

Create a variable to hold the branch specifier for the feature/login branch.

Use the checkout step with the Git plugin to clone the repository using the branch specifier.

Print the branch name being checked out.

💡 Why This Matters

🌍 Real World

In real projects, Jenkins pipelines often need to build code from specific branches like feature branches or release branches. Using branch specifiers helps automate this selection.

💼 Career

Understanding branch selection in Jenkins is essential for DevOps engineers to automate builds and deployments accurately based on branch workflows.

1

Set up Git repository URL

Create a variable called gitRepoUrl and set it to the string https://github.com/example/repo.git.

Jenkins

# Your code here

Need a hint?

Use def to declare the variable and assign the exact URL string.

2

Add branch specifier variable

Create a variable called branchName and set it to the string feature/login.

Jenkins

def gitRepoUrl = 'https://github.com/example/repo.git'
# Your code here

Need a hint?

Use def to declare the variable and assign the exact branch name string.

3

Checkout the Git repository using branch specifier

Use the checkout step to clone the repository from gitRepoUrl using the branch specifier branchName. Use the syntax: branches: [[name: branchName]], userRemoteConfigs: [[url: gitRepoUrl]] with $class: 'GitSCM'.

Jenkins

def gitRepoUrl = 'https://github.com/example/repo.git'
def branchName = 'feature/login'
# Your code here

Need a hint?

Use the checkout step with $class: 'GitSCM' and specify branches and userRemoteConfigs as lists of maps.

4

Print the branch being checked out

Write a println statement to display the text Checking out branch: feature/login using the variable branchName.

Jenkins

def gitRepoUrl = 'https://github.com/example/repo.git'
def branchName = 'feature/login'
checkout([$class: 'GitSCM', branches: [[name: branchName]], userRemoteConfigs: [[url: gitRepoUrl]]])
# Your code here

Need a hint?

Use println with string interpolation to print the branch name.