how to execute jenkins pipeline from config file - jenkins

Question

I have a generic multibranch project that I use on about 100 different git repos. The jenkins jobs are automatically generated and the only difference is the git repo.
Since they all build in the same way and I don't want to copy the same jenkins groovy file in all repos, I use "Build configuration -> mode -> by default jenkinsfile".
It breaks the rule to put the jenkinsfile in SCM as I would prefer to do. To minimize the impact, I would like that groovy file to only checkout the "real" jenkinsfile and execute it.
I use that script:
pipeline {
agent {label 'docker'}
stages {
stage('jenkinsfile checkout') {
steps {
checkout([$class: 'GitSCM',
branches: [[name: 'master']],
doGenerateSubmoduleConfigurations: false,
extensions: [[$class: 'RelativeTargetDirectory',
relativeTargetDir: 'gipc_synthesis']],
submoduleCfg: [],
userRemoteConfigs: [[url: 'ssh://git#camtl1bitmirror.gad.local:7999/mtlstash/mvt/gipc_synthesis.git']]]
)
}
}
stage('Load user Jenkinsfile') {
//agent any
steps {
load 'gipc_synthesis/jenkins/synthesis_job.groovy'
}
}
}
}
The problem I have with that is I can't have another pipeline in the groovy file I am loading. I don't want to define only functions but really the whole pipeline in that file. Any solution to that problem? I am also interested in solution that would completely avoid the whole issue.
Thank you.

Answer 1

You can have a shared library with your pipeline inside:
// my-shared.git: vars/build.groovy
def call(String pathToGit) // and maybe additional params
{
pipeline {
agent { ... }
stages {
stage('jenkinsfile checkout') {
steps {
checkout([$class: 'GitSCM',
branches: [[name: 'master']],
doGenerateSubmoduleConfigurations: false,
extensions: [[$class: 'RelativeTargetDirectory',
relativeTargetDir: 'gipc_synthesis']],
submoduleCfg: [],
userRemoteConfigs: [[url: pathToGit]]]
)
}
}
}
}
}
and use it in your Jenkinsfile e.g. like this:
#!groovy
#Library('my-shared') _
def pathToGit = 'ssh://git#camtl1bitmirror.gad.local:7999/mtlstash/mvt/gipc_synthesis.git'
build(pathToGit)