Environment variables in builds in Jenkins - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the environment variable named 'BUILD_NUMBER' in a Jenkins pipeline.

Jenkins

echo "Build number is: $[1]"

Drag options to blanks, or click blank then click option'

ABUILD_NUMBER

BJOB_NAME

CBUILD_ID

DWORKSPACE

Attempts:

3 left

💡 Hint

Common Mistakes

Using JOB_NAME instead of BUILD_NUMBER

Using WORKSPACE which is the build directory path

The environment variable BUILD_NUMBER holds the current build number in Jenkins pipelines.

2fill in blank

medium

Complete the code to set a custom environment variable named 'MY_VAR' with value 'hello' in a Jenkins pipeline.

Jenkins

environment {
  MY_VAR = '[1]'
}

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Ahello

Bworld

Cgreetings

Dhi

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect value like 'world' or 'hi'

Not using quotes around the value

To set a custom environment variable, assign the desired string value. Here, MY_VAR is set to hello.

3fill in blank

hard

Fix the error in the code to correctly print the environment variable 'MY_VAR' in a Jenkins pipeline script.

Jenkins

echo "Value is: $[1]"

Drag options to blanks, or click blank then click option'

Aenvironment.MY_VAR

BMY_VAR

Cenv['MY_VAR']

Denv.MY_VAR

Attempts:

3 left

💡 Hint

Common Mistakes

Using just MY_VAR without env prefix

Using environment.MY_VAR which is invalid

In Jenkins scripted pipelines, environment variables are accessed via env.VAR_NAME. So env.MY_VAR is correct.

4fill in blank

hard

Fill both blanks to create a map of environment variables with keys as variable names and values uppercased, filtering only variables starting with 'BUILD'.

Jenkins

def buildVars = env.getEnvironment().findAll { k, v -> k.[1]('BUILD') }
return buildVars.collectEntries { k, v -> [k, v[2]] }

Drag options to blanks, or click blank then click option'

AstartsWith

B.toUpperCase()

C.toLowerCase()

Dcontains

Attempts:

3 left

💡 Hint

Common Mistakes

Using contains instead of startsWith

Using toLowerCase instead of toUpperCase

The startsWith method filters keys starting with 'BUILD'. The toUpperCase() ensures values are uppercase.

5fill in blank

hard

Fill all three blanks to define a Jenkins pipeline stage that prints the value of an environment variable 'DEPLOY_ENV' and fails the build if it is not set.

Jenkins

stage('Check Env') {
  steps {
    script {
      def envVar = env.[1]
      if (envVar == [2]) {
        error('[3]')
      }
      echo "Deploying to: ${envVar}"
    }
  }
}

Drag options to blanks, or click blank then click option'

ADEPLOY_ENV

Bnull

CDEPLOY_ENV is not set!

DBUILD_ENV

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable name like BUILD_ENV

Comparing to empty string instead of null

Not providing an error message

The environment variable DEPLOY_ENV is accessed via env.DEPLOY_ENV. If it is null, the build fails with the error message.