RVM is not a function, selecting rubies with 'rvm use ...' will not work from jenkinsfile

Question

I am trying to use a version of ruby via RVM in my Jenkinsfile like this:

sh 'rvm use ruby 2.3.1'

However, I believe the above command isn't doing what is intended because i get this message after it

+ rvm use ruby 2.3.1
 RVM is not a function, selecting rubies with 'rvm use ...' will not work.

I read other answers that suggest adding #!/bin/bash -xl, however, I am using this from Jenkinsfile and not a bash script.

is there a way to resolve this? I just want to set ruby to 2.3.1 and then run one command.

I've also tried using create default but still the version of ruby being printed is 2.0.0

  sh '''
    #!/bin/bash -xl
    echo $PATH
    rvm install ruby-2.3.1
    rvm alias create default 2.3.1 && ruby --version
    ruby --version
  '''

Answer 1

Put #!/bin/bash -l as the first line of your script. It creates a login shell.

You could also source rvm first before calling rvm use:

source /usr/local/rvm/scripts/rvm