Choose an environment variable based on the branch name and store its value to another environment variable

Question

I'm trying to send email notifications to specific user whose branch is currently checked out in the Jenkins build process. For accomplishing this, I have used naming conventions in the environment variables.

E.g.

master_MAIL = [email protected]
ABC_MAIL = [email protected]

Where MASTER and ABC are actual branch names.

env.GIT_LOCAL_BRANCH gives me with the current branch name being checked out.

Based on the current branch name, I have to pick the correct environment variable, and store its value (mail ID) to another environment variable.

pipeline {
    agent any

    environment {
        CURRENT_MAIL = "\$${env.GIT_LOCAL_BRANCH}_MAIL"
        // Here I am trying to pick the specific mail id of the branch being
        // check out and store it to new environment variable named 
        // "CURRENT_MAIL".
        // But This gives only the value "$master_MAIL" but not the value
        // stored in master_MAIL environment variable.
    }

    stages {
    }

    post {
        always {
            mail (
            from: ""
            to: "$CURRENT_MAIL"
            // Here I have to use that environment variable to send email to
            // that specific user.
            subject: "")
        }
    }

The expected result is: CURRENT_MAIL environment variable should have the value contained in the {Branchname}_MAIL environment variable.

E.g. Consider I have these two environment variables set in my configuration:

master_MAIL = [email protected]
ABC_MAIL = [email protected]

Then, if the current branch being checked out is master branch, then the environment variable CURRENT_MAIL should have the value [email protected].

When indenting your question's source code I've noticed there is a missing curly bracket closing the pipeline block. Is it also like that in your jenkins configuration, or is it just a copy & paste error to Stack Overlow? — sɐunıɔןɐqɐp

Dibakar Aditya Dibakar Aditya · Accepted Answer · 2019-11-02T16:52:53

You need the groovy evaluate() helper method for dynamic evaluation of groovy expressions.

environment {
    CURRENT_MAIL = evaluate(env.GIT_LOCAL_BRANCH + '_MAIL')
    // OR using Groovy GStrings as
    // CURRENT_MAIL = evaluate("${env.GIT_LOCAL_BRANCH}_MAIL")
}

Choose an environment variable based on the branch name and store its value to another environment variable

1 Answers