Jenkins Pipeline - inserting variable in shell creates a new line

Question

I am using Choice param in my jenkins file to select environment as follows:

pipeline {
     agent any
     parameters {
    choice(
        name: 'ENVIRONMENT_URL',
        choices: "https://beta1.xyz.com\nhttps://beta2.xyz.com\nhttps://beta3.xyz.com",
        description: 'interesting stuff' )
  }

in the Stage section, i have the following piece

 stage('execute tests') {
            steps {
                script {
                        sh """URL=${ENVIRONMENT_URL} npm run e2e:tests"""
                        sh 'echo -e "\nTest Run Completed.\n"'   
                }
             }   
            }

However, when i run the pipeline job by selecting the choice parameter i added, the following gets executed (the inserted choice param creates a line break):

+ URL=https://beta1.xyz.com
+ npm run e2e:tests

Using the variable is causing a line break and that's what is causing issue. I have tried different ways to avoid line break. Tried using a variable but that didn't help. tried with different quotations, that didn't either.

What can i do to avoid line break ?

Matthew Schuchard · Accepted Answer · 2020-02-07 18:59:44Z

You can use the trim method on a String class type to remove trailing whitespace and newline:

sh "URL=${params.ENVIRONMENT_URL.trim()} npm run e2e:tests"

Note I also specified your parameter is in the params map and removed the triple quotes as those are for multiline string formatting.

Alternatively, you can specify the choices as an array instead of as a multiline string. The choices argument would then appear like:

choice(
  name:        'ENVIRONMENT_URL',
  choices:     ['https://beta1.xyz.com', 'https://beta2.xyz.com', 'https://beta3.xyz.com'],
  description: 'interesting stuff'
)

Either solution would fix your issue.

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