Is it not possible to utilize global variables in the function of a Jenkinsfile?

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Yes, it is possible to utilize global variables in the function of a Jenkinsfile. The Jenkinsfile supports the use of global variables defined in the Jenkins instance, as well as variables defined in the pipeline script itself. The global variables can be accessed using the "env" object, which allows access to environment variables and global variables defined in Jenkins. For example, the following script utilizes a global variable "GLOBAL_VAR" in a pipeline step:

pipeline {
    agent any
    stages {
        stage('Example') {
            steps {
                sh "echo ${env.GLOBAL_VAR}"
            }
        }
    }
}

Alternatively, you can define your own global variables within the script using the "def" keyword. These variables can be then be utilized in the pipeline script just like any other variable.

For example, the following script defines a global variable within the pipeline script:

def GREETER = 'Hello'

pipeline {
    agent any
    stages {
        stage('Example') {
            steps {
                sh "${GREETER} World"
            }
        }
    }
}

Overall, utilizing global variables can save time and increase efficiency while creating a Jenkinsfile.