Jenkins Groovy pass variables to parallel runs - jenkins

Question

I am having problems figuring out how to pass some variables into the parallel runs in the Jenkins groovy script below:
#!/usr/bin/env groovy
def call(version, project) {
sh '''#!/bin/bash
[[ ! -e ${WORKSPACE}/target/rpm/${project}/RPMS/ ]] && mkdir -p ${WORKSPACE}/target/rpm/${project}/RPMS/
(( $(ls ${WORKSPACE}/target/rpm/${project}/RPMS/*.rpm | wc -l) != 0 )) && rm ${WORKSPACE}/target/rpm/${project}/RPMS/*.rpm
cd ${WORKSPACE}/scripts/fpm_requirements && bundle install && bundle show fpm
'''
parallel (
"package foo": {
sh '''#!/bin/bash
export PATH=$PATH:~/bin:~/.gem/ruby/gems
cd ${WORKSPACE}/scripts/fpm_requirements
echo Project is ${project}
echo Version is ${version}
echo Iteration is $(echo ${version} | cut -d . -f 3)
'''
},
"package bar": {
sh '''#!/bin/bash
export PATH=$PATH:~/bin:~/.gem/ruby/gems
cd ${WORKSPACE}/scripts/fpm_requirements
echo Project is ${project}
echo Version is ${version}
echo Iteration is $(echo ${version} | cut -d . -f 3)
'''
}
)
}
So the version and project variables are populated in the first shell that is called but when they hit the two parallel runs they are not being pulled in.
I have tried a few different options to pass them in but none have worked.
Does anyone have any relevant ideas that might help?

Answer 1

You should change the ''' to """. In Groovy, string inside single/triple quote won't trigger string interpolation, but string inside single/triple double quote will do that.
So the ${version} and ${project} in your Shell script will be treated as variable from Shell context, but actually they are exist in Groovy context.
More about Groovy String at here, Below option 2 more suitable for your issue.
Option 1) using "" or """
"package foo": {
sh """#!/bin/bash
export PATH=\$PATH:~/bin:~/.gem/ruby/gems
cd \${WORKSPACE}/scripts/fpm_requirements
echo Project is ${project}
echo Version is ${version}
echo Iteration is \$(echo ${version} | cut -d . -f 3)
"""
},
"package bar": {
sh """#!/bin/bash
export PATH=\$PATH:~/bin:~/.gem/ruby/gems
cd \${WORKSPACE}/scripts/fpm_requirements
echo Project is ${project}
echo Version is ${version}
echo Iteration is \$(echo ${version} | cut -d . -f 3)
"""
}
Attention: need to escape the $ ahead of ${WORKSPACE} and $(echo ..), because we hope $ be kept after interpolation.
Option 2) using ' or ''' and inject version and project into Environment Variables of Shell context.
def call(version, project) {
env.version=version
env.project=project
// Groovy env api used to inject groovy value into environment variable
// so that you can refer groovy value later in shell script
// still use ''' in following code, no need to change
...