Can I update a Jenkins Global Environment Variable from a pipeline script?

Question

If I define an environment variable (eg. VersionNum) under Jenkins Global Properties, can I update the value within a pipeline script? I was hoping to use it to store version information and update according to script execution results.

What I want to do is write a pipeline script like:

node {
    stage {'Stage1') {
        VersionNum = '5'
    }
}

that will update the global environment variable so the new value that will persist and can be used by other Jenkins jobs.

Answer 1

Rather than try to use the global environment variable, I read a properties file with the Pipeline Utility Steps plugin:

def props = readProperties  file:"${WORKSPACE}\\BuildVersion.properties" 
MajVersion = props['MAJOR_VERSION'].trim()
MinVersion = props['MINOR_VERSION'].trim()

Then if I change a value, I write it back with:

bat "(echo MAJOR_VERSION=${MajVersion} && echo MINOR_VERSION=${MinVersion}) \u003E \"%WORKSPACE%\\BuildVersion.properties\""