Groovy Function for Jenkins pipelines

get-envvars.groovy

#!/usr/bin/env groovy

/**
 * Reads environment variables from a property file, and loads them into Jenkins ENV
 * @author thabet.amer@gmail.com
 * @since Jenkins 2.204.1
 * @param String path
 * @return String array
 *
 * Example property file:
 *  # Environment variables for Jenkins builds
 *  VAR1=SAMPLE-VAR
 *
 */

def loadEnvvars(String path) {
    try {
        Map envvars = readProperties(interpolate: true, file: path) ?: null
        if (!envvars) { throw new Exception("unable to read properties file " + path) }
        keys = envvars.keySet()
        for(key in keys) {
            value = envvars["${key}"]
            env."${key}" = "${value}"
        }
        return envvars
    }
    catch(err) {
        echo "ERROR: caught in loadEnvvars ${err}"
    }
}