Accessing a downstream parameter using build flow

Question

Assume I have the following downstream job:

// DOWNSTREAM JOB
DYNAMIC_VAR = ""

parallel(
  {
    DYNAMIC_VAR = new Date()    // Some other value determined 
                                // at runtime by this job
  },
  { 
    // Some other stuff...
  }
)

As part of my upstream job (see example below) I want to be able to call the downstream job, and access the variable that was set during the downstream job.

// UPSTREAM JOB 
my_build = build("my-custom-job")

// Would like to beable to do something like
// out.println my_build.build.get_var('DYNAMIC_VAR')
//  or 
// out.println my_build.build.DYNAMIC_VAR

Looking through the output it seems that the variable is not returned, and hence is not accessible. I suspect this is because the variable in question (DYNAMIC_VAR) is only available during the scope of the downstream job, and hence once the job finishes the variable is removed.

My two questions I wanted to ask were:

Is it correct that the variables are removed upon job completion?
Does anyone have an idea how this could (if it can) be achieved (additional plugins are fine if required)?

score 0 · Answer 1 · answered Jul 23 '15 at 10:53

1) Would outputting the variable=value pair to some file be an acceptable solution for you?

2) I haven't used groovy in Jenkins much, but all the job's environment variables are stored under:

${JENKINS_HOME}/jobs/${JOB_NAME}/builds/${BUILD_NUMBER}/injectedEnvWars.txt

This may or may not require EnvInject plugin.

score 0 · Answer 2 · answered Feb 06 '18 at 14:28

According to the comments here: https://issues.jenkins-ci.org/browse/JENKINS-18784

You can do the following:

// – In job First, I am setting the environment variable testKey    
b = build( "First" ) 

// Then, using it in workflow: 
out.println b.build.properties.environment['testKey']
// Or 
b.build.properties.environment.testKey

Accessing a downstream parameter using build flow

2 Answers2