how can I get the value of a global variable within a function in a pipeline?

[jesus fernandez]

I have a declarative pipeline with a few steps. at the end I send a message to slack with some statistics of the compilation times and some more information. I want to send in case it fails the stage at which it fails. I have set a global variable but the function does not seem to be able to read its value. This is a simplified version of what I have: 

```

def FAILED_STAGE

def sendSlackNotifcation() 

{

    if ( currentBuild.currentResult == "SUCCESS" ) {

        slackSend message: "${currentBuild.result}", channel: '#jenkins_bot2'

    }

        

    else {

        slackSend color : "#FF0000", message: "${FAILED_STAGE}", channel: '#jenkins_bot2'

    }

}

pipeline {

    agent any

    stages {

        stage('stage1') {

            steps{

                echo "stage1"

            }

        }     

        

        stage('stage2') {

            steps{

                echo "stage2"

            }

        }

        

        stage("Stage 3") {

            steps {

                script {

                    FAILED_STAGE=env.STAGE_NAME

                    echo "${FAILED_STAGE}"

                    error "failed for some reason."

                }

            }

        }

    }

    post {

    failure {

        sendSlackNotifcation()

        }

    }

}

```

And this is the output I get:

```

13:38:53  [Pipeline] {

13:38:53  [Pipeline] stage

13:38:53  [Pipeline] { (stage1)

13:38:53  [Pipeline] echo

13:38:53  stage1

13:38:53  [Pipeline] }

13:38:53  [Pipeline] // stage

13:38:53  [Pipeline] stage

13:38:53  [Pipeline] { (stage2)

13:38:53  [Pipeline] echo

13:38:53  stage2

13:38:53  [Pipeline] }

13:38:53  [Pipeline] // stage

13:38:53  [Pipeline] stage

13:38:53  [Pipeline] { (Stage 3)

13:38:53  [Pipeline] script

13:38:53  [Pipeline] {

13:38:53  [Pipeline] echo

13:38:53  Stage 3

13:38:53  [Pipeline] error

13:38:53  [Pipeline] }

13:38:53  [Pipeline] // script

13:38:53  [Pipeline] }

13:38:53  [Pipeline] // stage

13:38:53  [Pipeline] stage

13:38:53  [Pipeline] { (Declarative: Post Actions)

13:38:53  Error when executing failure post condition:

13:38:53  groovy.lang.MissingPropertyException: No such property: FAILED_STAGE for class: WorkflowScript

```

[Ven H]

Try defining it inside the "environment" stage / step.

Regards,
Venkatesh

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[jesus fernandez]

Thanks for replying, any example or any link where to get information about how to do so? I am a bit new to Jenkins

[Ven H]

https://www.jenkins.io/doc/book/pipeline/jenkinsfile/#using-environment-variables

Regards,
Venkatesh

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[Jesus Fernandez]

[Victor Martinez]

You can simplify it quite a bit with the post stage event https://www.jenkins.io/doc/book/pipeline/syntax/#post

The example pipeline uses the post stages section, you can use the one specific the stage 3

Another example can be found in https://www.jenkins.io/blog/2017/02/15/declarative-notifications/

Environment variables within an environment section are immutable, though you can use the script closure with the env map to set a new env variable that can be override

For instance:

stage(“stage 3”) {

  steps{

     script{

       env.FAILED_STAGE=env.STAGE_NAME

     }

     error ...

  }

}

Cheers

See 

[jesus fernandez]

Thanks a lot Victor, the links provided made it much clear now and the example worked just fine. You are always saving me hehe