Jenkins Pipeline Across Multiple Docker Images - docker

Question

Using a declarative pipeline in Jenkins, how do I run stages across multiple versions of a docker image. I want to execute the following jenkinsfile on python 2.7, 3.5, and 3.6. Below is a pipeline file for building and testing a python project in a docker container
pipeline {
agent {
docker {
image 'python:2.7.14'
}
}
stages {
stage('Build') {
steps {
sh 'pip install pipenv'
sh 'pipenv install --dev'
}
}
stage('Test') {
steps {
sh 'pipenv run pytest --junitxml=TestResults.xml'
}
}
}
post {
always {
junit 'TestResults.xml'
}
}
}
What is minimal amount of code to make sure the same steps succeed across python 3.5 and 3.6? The hope is that if a test fails, it is evident which version(s) the test fails on.
Or is what I'm asking for not possible for declarative pipelines (eg. scripted pipelines may be what would most elegantly solve this problem)
As a comparison, this is how Travis CI let's you specify runs across different python version.

Answer 1

I had to resort to a scripted pipeline and combine all the stages
def pythons = ["2.7.14", "3.5.4", "3.6.2"]
def steps = pythons.collectEntries {
["python $it": job(it)]
}
parallel steps
def job(version) {
return {
docker.image("python:${version}").inside {
checkout scm
sh 'pip install pipenv'
sh 'pipenv install --dev'
sh 'pipenv run pytest --junitxml=TestResults.xml'
junit 'TestResults.xml'
}
}
}
The resulting pipeline looks like
Ideally we'd be able to break up each job into stages (Setup, Build, Test), but
the UI currently doesn't support this (still not supported).