title: How to retrieve the git branch name that was built by Jenkins when using inverse branch selection strategy?
body: <p>We have one Jenkins job which builds every branch except master when there are new commits. This behavior can be configured via git plugin's 'choosing strategy:inverse' so that it listens to every branch except a specified branch. </p>
  
  <p>This functions very nicely. But the problem is that GIT_BRANCH environment variable always refers to the excluded branch('origin/master' in our case). How to query the actual branch that was built by Jenkins?</p>
  
  <p>Currently I am using a workaround that I grep it from generated changelog.xml. But it happens sometimes that changelog.xml is empty when Jenkins switches between different branches and I cannot find this info. What is the correct way of retrieving/querying from Jenkins the branch that was actually built?</p>