Background
My team wants to update several linting rules in our project, however, doing so will cause our Jenkins build pipeline which lints, tests and builds each feature branch to break. We don't want to lose the value of linting each feature branch before merging, so we agree that linting only the files that the feature branch changes is a reasonable way to introduce these new lint rules without forcing us to re-lint the whole project up-front. Given that our entire project is already linted, this seems like a reasonable move.
A while ago I wrote a git tool to do exactly this. It determines which files have changed since the feature branch diverged from master and outputs those files so they can be consumed by eslint, pycodestyle and other linters. Here's the source if you're interested in how this is done.
Problem
Jenkins declarative build process and it's GitHub Branch Source Plugin seem to have a brittle checkout behavior that can't be modified to checkout more than just the feature branch that it's called on to build.
If I call git fetch origin stage within a build step, Jenkins complains about missing credentials. I don't feel comfortable sticking in credentials into my pipeline file, I'd MUCH prefer to continue using the Git plugin to manage credentials to our private github repo and pull branches, however, I'm at a loss as to how to specify for it to fetch more than just the feature branch.
For reference, here's the relevant portions of my Jenkinsfile
As you can see, I've tried adding the GitSCM code block to no avail. I've read this medium article which solves a similar problem, but I'm not using SSH credentials and I'd prefer not to given than we're already managing credentials using the Git plugin.
pipeline {
agent any
tools {
nodejs 'node12.7.0'
}
stages {
stage('checkout') {
steps {
checkout([
$class: 'GitSCM',
branches: [[name: '*']],
extensions: scm.extensions,
userRemoteConfigs: [],
doGenerateSubmoduleConfigurations: true
])
}
}
stage('install') {
steps {
script {
sh 'git config --add remote.origin.fetch +refs/heads/master:refs/remotes/origin/master'
sh 'yarn install'
}
}
}
stage('lint & test') {
failFast true
parallel {
stage('lint') {
when {
not {
anyOf {
branch 'stage'; branch 'int'; branch 'prod'
}
}
}
steps {
script {
sh """
git submodule update --init
yarn run lint
"""
}
}
}
...
}
}
stage('deploy') {...}
}
}
post {
failure {
notifySlack()
}
}
}
