Original reporter misery
I need to know the current branch in generated job (see conditional step) but there is no $BRANCH variable or something like this I can use. $JOB_NAME does not contain only "branch name".
Please add a $CURRENT_BRANCH or something like this.
As a work-around I used Envinject plugin with the following groovy script.
It's weird that currentJob.getName() works instead of $JOB_NAME.