How do I pass variables between stages in a declarative Jenkins pipeline?

Question

How do I pass variables between stages in a declarative pipeline?

In a scripted pipeline, I gather the procedure is to write to a temporary file, then read the file

Answer 1

I had a similar problem as I wanted one specific pipeline to provide variables and many other ones using it to get this variables.

I created a my-set-env-variables pipeline

script
{
    env.my_dev_version = "0.0.4-SNAPSHOT"
    env.my_qa_version  = "0.0.4-SNAPSHOT"
    env.my_pp_version  = "0.0.2"
    env.my_prd_version = "0.0.2"
    echo " My versions  [DEV:${env.my_dev_version}] [QA:${env.my_qa_version}] [PP:${env.my_pp_version}] [PRD:${env.my_prd_version}]"
}

I can reuse these variables in a another pipeline my-set-env-variables-test

script 
{
    env.dev_version = "NOT DEFINED DEV"
    env.qa_version  = "NOT DEFINED QA"
    env.pp_version  = "NOT DEFINED PP"
    env.prd_version = "NOT DEFINED PRD"
}

stage('inject variables') {

    echo "PRE DEV version = ${env.dev_version}"
    script 
    {
       def variables = build job: 'my-set-env-variables'
       def vars = variables.getBuildVariables()
      //println "found variables" + vars
      env.dev_version = vars.my_dev_version
      env.qa_version  = vars.my_qa_version
      env.pp_version  = vars.my_pp_version
      env.prd_version = vars.my_prd_version
    }
}

stage('next job') {
    echo "NEXT JOB DEV version = ${env.dev_version}"
    echo "NEXT JOB QA version = ${env.qa_version}"
    echo "NEXT JOB PP version = ${env.pp_version}"
    echo "NEXT JOB PRD version = ${env.prd_version}"

}