title: Jenkins GitPlugin - how to find out what failed on a pre-build merge?
body: <p>We have Jenkins installed using GitPlugin to pull branches and merge them, as described in the <a href="https://wiki.jenkins-ci.org/display/JENKINS/Git+Plugin#GitPlugin-AdvancedFeatures" rel="nofollow">GitPlugin Wiki</a>.  However, when the merge fails there's no output saying why it failed, just that it didn't merge cleanly:</p>
  
  <pre><code>&lt;snip&gt;
  Seen branch in repository origin/HEAD
  Seen branch in repository origin/labs/intro
  Seen branch in repository origin/master
  Commencing build of Revision 620c4373792b8cef6a3992b6676892479ed379b0 (origin/REV_4/REV-1234)
  Merging Revision 620c4373792b8cef6a3992b6676892479ed379b0 (origin/REV_4/REV-1234) onto REV_4/integration
  ERROR: Branch not suitable for integration as it does not merge cleanly
  [JaCoCo plugin] Collecting JaCoCo coverage data...
  &lt;snip&gt;
  </code></pre>
  
  <p>I can't duplicate this behavior locally.  It has something to do with the Git line ending settings.</p>
  
  <p>Can anybody tell me how to squeeze more information out of Jenkins and the GitPlugin, so I can tell what files are failing?</p>