title: Jenkins: conditional trigger on the build step
body: <p>We have a project with couple of subprojects in the same SVN repository.
  For example:</p>
  
  <pre><code>svn://ip/svn/ trunk/subproject1
  svn://ip/svn/ trunk/subproject2
  </code></pre>
  
  <p>Is it possible in Jenkins to create conditional trigger on the build step?</p>
  
  <p>I will clarify: I want to execute the Maven build step only if its SVN tree was changed.</p>
  
  <p>For example, svn://ip/svn/ trunk/subproject1 tree was changed. In this case the whole build should be triggered.</p>
  
  <p>Then, (since svn://ip/svn/ trunk/subproject1 tree was changed) the Maven build step for subproject1 will be executed.</p>
  
  <p>But the Maven build step for subproject2 will NOT be executed, since svn://ip/svn/ trunk/subproject2 was not changed.</p>
  
  <p>Any help will be appreciated!</p>
  
  <p>Best regards,
  Michael</p>