CODEWITHSUNDEEP
jenkinsjenkins-pipeline
BigGold1310
BigGold1310

Reputation: 13

Can't use env variables in Jenkins Pipeline/Multi-Pipeline

I'm new to Jenkins. Today I tried to create a Multibranche Pipeline. I would like to tag the created docker image with the branch name.

My Jenkins file locks like follows:

node {
    def app

    stage('Clone repository') {
        /* Let's make sure we have the repository cloned to our workspace */

        checkout scm
    }

    stage('Build image') {
        /* This builds the actual image; synonymous to
         * docker build on the command line */

        app = docker.build("brosftw/minecraft")
    }

    stage('Test image') {

        app.inside {
            sh 'echo ${BUILD_BRANCHENAME}'
        }
    }

    stage('Push image') {
        /* Finally, we'll push the image with two tags:
         * First, the incremental build number from Jenkins
         * Second, the 'latest' tag.
         * Pushing multiple tags is cheap, as all the layers are reused. */

        /* Docker credentials from Jenkins ID for BrosFTW Repository */

         docker.withRegistry('https://registry.hub.docker.com', 'e2fd9e87-21a4-4ee0-86d4-da0f7949a984') {
              /* If Branch is master tag it with the latest tag */
              if ("${env.BUILD_BRANCHENAME}" == "master") {
                   app.push("latest")
              } else {
                   /* If it is a normal branch tag it with the branch name */
                   app.push("${env.BUILD_BRANCHENAME}")
              }
         }
    }
}

Edited

docker push request from Jenkins job log:

+ docker tag brosftw/minecraft registry.hub.docker.com/brosftw/minecraft:null
[Pipeline] sh
[Minecraft-Test_master-ATFJUB2KKWARM4FFRXV2PEMHX6QFD24UQ5NGQXBIWT5YQJNXBAIA] Running shell script
+ docker push registry.hub.docker.com/brosftw/minecraft:null
The push refers to a repository [registry.hub.docker.com/brosftw/minecraft]

And the output of the echo command is the following:

[Pipeline] {
[Pipeline] sh
[Minecraft-Test_master-ATFJUB2KKWARM4FFRXV2PEMHX6QFD24UQ5NGQXBIWT5YQJNXBAIA] Running shell script
+ 
[Pipeline]

Can anyone tell me what I'm doing wrong with the env variables?

My second Issue is, that the app.inside doesn't return the branch name.... and I don't understand why.

Thanks for every answer.

Upvotes: 0

Views: 1348

Answers (1)

StephenKing
StephenKing

Reputation: 37650

You can access the branch name using env.BRANCH_NAME. Further, you don't need interpolate variables inside strings.

So the last part should work as follows:

     docker.withRegistry('https://registry.hub.docker.com', 'e2fd9e87-21a4-4ee0-86d4-da0f7949a984') {
          /* If Branch is master tag it with the latest tag */
          if (env.BRANCH_NAME == "master") {
               app.push("latest")
          } else {
               /* If it is a normal branch tag it with the branch name */
               app.push(env.BRANCH_NAME)
          }
     }

Not sure, why you thought the variable is called BUILD_BRANCHENAME. It's BRANCH_NAME. You can see such list of global variables using the Pipeline Syntax link of a pipeline job (and then under Global Variables Reference).

Upvotes: 1

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