title: Generating Custom GitSCM Changelog in Jenkins Pipeline
body: <p>I have a Jenkins (2.36) pipeline job, where I check out a git project and I want to control what goes into the changelog:</p>
  
  <pre><code>CHANGELOG = ""
  CHECK_SINCE = 1488326400
  
  stage('Fetch') {
      node('docker') {
          checkout([$class: 'GitSCM', branches: [[name: '*/develop']], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'WipeWorkspace'], [$class: 'AuthorInChangelog']], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '...', url: '...']]])
          CHANGELOG = sh(returnStdout: true, script: "git log --after ${CHECK_SINCE} --pretty=fommit %H %ntree %T %nparent %P %nauthor %an &lt;%ae&gt; %ad %ncommiter %cn &lt;%ce&gt; %cd %n %n    %s %n %n %n' --raw --no-abbrev").trim()
          docker.build("pipeline_test", "tools/build").inside {
              sh 'echo HELLO!'
          }
      }
  }
  
  stage('Update') {
      node('master') {
          fileExists "${JENKINS_HOME}/jobs/PipelineTest/jobs/${JOB_BASE_NAME}/builds/${BUILD_ID}/changelog0.xml"
          changelog_file = new File("${JENKINS_HOME}/jobs/PipelineTest/jobs/${JOB_BASE_NAME}/builds/${BUILD_ID}/changelog0.xml")
          changelog_file &lt;&lt; CHANGELOG
      }
  }
  </code></pre>
  
  <p>When I view the file <code>changelog0.xml</code>, the content is exactly as it should be:</p>
  
  <pre><code>commit b2f615ee31bc51922cdd6ca373a90b70d5c95d1b
  tree 9bd57df4c9c85ee1958d7e5b3ba3ab999e18e752
  parent 35c47eb0b3a0cb77574465a8136ad37a294f45ca
  author ssengupta &lt;ssengupta@gmail.com&gt; 2017-03-10 12:53:41 +0100
  committer ssengupta &lt;ssengupta@gmail.com&gt; 2017-03-10 12:53:41 +0100
  
      Some more changes.
  
  
  
  :100644 100644 1ac06d64c274f8e2dbea325a07c15f11d2f5b4d0 6460796ab551fc1b84d25ebadbd369187fdec382 M  ReadMe.md
  commit 35c47eb0b3a0cb77574465a8136ad37a294f45ca
  tree 7a5cdb20288c4f3504117cfede5451e3b94fc465
  parent 5b6d2f65010c0ae758c002d7a7eb0e66677c3193
  author ssengupta &lt;ssengupta@gmail.com&gt; 2017-03-10 12:53:26 +0100
  committer ssengupta &lt;ssengupta@gmail.com&gt; 2017-03-10 12:53:26 +0100
  
      Some changes
  
  
  
  :100644 100644 dd7dbfe9ab082d444c9510f00fc79d7f72121012 1ac06d64c274f8e2dbea325a07c15f11d2f5b4d0 M  ReadMe.md
  </code></pre>
  
  <p>But when I want to view the changelog from my Jenkins web frontend's job page by clicking on the 'Changes' link from the left menu, the changelog is visible there if and only if I remove the <code>docker.build().inside{}</code> block. Otherwise it is empty.</p>
  
  <p>I have tried setting a unique image name for every build. I have tried introducing delays in various places. Does not help.</p>
  
  <p>What is changing that is making the changelog show up empty in the web frontend? How do I fix it?</p>
  
  <h1>Update</h1>
  
  <p>I have also tried a different approach: updating <code>currentBuild.changeSets</code> instead of writing to <code>changelog0.xml</code>. The pipeline script the looks like this:</p>
  
  <pre><code>import hudson.plugins.git.GitChangeSet
  
  CHANGELOG = ""
  CHECK_SINCE = 1488326400
  
  stage('Fetch') {
      node('docker') {
          checkout([$class: 'GitSCM', branches: [[name: '*/develop']], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'WipeWorkspace'], [$class: 'AuthorInChangelog']], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '...', url: '...']]])
          CHANGELOG = sh(returnStdout: true, script: "git log --after ${CHECK_SINCE} --pretty=fommit %H %ntree %T %nparent %P %nauthor %an &lt;%ae&gt; %ad %ncommiter %cn &lt;%ce&gt; %cd %n %n    %s %n %n %n' --raw --no-abbrev").trim()
          docker.build("pipeline_test", "tools/build").inside {
              sh 'echo HELLO!'
          }
          def modified_changes = new GitChangeSet(CHANGELOG.readLines(), true)
          currentBuild.rawBuild.changeSets &lt;&lt; modified_changes
      }
  }
  </code></pre>
  
  <p>Although I am not a Java developer, I expected the above code to do something meaningful, since <a href="https://github.com/jenkinsci/git-plugin/blob/master/src/main/java/hudson/plugins/git/GitChangeSet.java" rel="noreferrer">GitChangeSet</a> has the constructor <code>public GitChangeSet(List&lt;String&gt; lines, boolean authorOrCommitter)</code></p>
  
  <p>The pipeline successfully executed. But when I clicked on the 'Changes' link on the web frontend, I got this:</p>
  
  <pre><code>org.apache.commons.jelly.JellyTagException: jar:file:/var/lib/jenkins/plugins/workflow-job/WEB-INF/lib/workflow-job.jar!/org/jenkinsci/plugins/workflow/job/WorkflowRun/changes.jelly:33:67: &lt;st:include&gt; No page found 'index.jelly' for class hudson.plugins.git.GitChangeSet
      at org.kohsuke.stapler.jelly.IncludeTag.doTag(IncludeTag.java:124)
      at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
      at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:161)
      at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:150)
      at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)
      at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
      at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.apache.commons.jelly.tags.core.CoreTagLibrary$1.run(CoreTagLibrary.java:98)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
      at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)
      at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
      at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
      at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)
      at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
      at org.kohsuke.stapler.jelly.JellyViewScript.run(JellyViewScript.java:95)
      at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:63)
      at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:53)
      at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:97)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.MetaClass$10.dispatch(MetaClass.java:374)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
      at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
      at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
      at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
      at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
      at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)
      at com.smartcodeltd.jenkinsci.plugin.assetbundler.filters.LessCSS.doFilter(LessCSS.java:47)
      at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
      at org.jenkinsci.plugins.modernstatus.ModernStatusFilter.doFilter(ModernStatusFilter.java:52)
      at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
      at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
      at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
      at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
      at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
      at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:553)
      at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
      at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
      at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
      at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
      at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
      at org.eclipse.jetty.server.Server.handle(Server.java:499)
      at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
      at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
      at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
      at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      at java.lang.Thread.run(Thread.java:745)
  Caused: javax.servlet.ServletException
      at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:105)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.MetaClass$10.dispatch(MetaClass.java:374)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
      at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
      at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
      at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
      at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
      at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
      at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
      at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)
      at com.smartcodeltd.jenkinsci.plugin.assetbundler.filters.LessCSS.doFilter(LessCSS.java:47)
      at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
      at org.jenkinsci.plugins.modernstatus.ModernStatusFilter.doFilter(ModernStatusFilter.java:52)
      at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
      at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
      at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
      at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
      at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
      at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
      at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
      at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:553)
      at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
      at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
      at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
      at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
      at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
      at org.eclipse.jetty.server.Server.handle(Server.java:499)
      at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
      at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
      at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
      at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      at java.lang.Thread.run(Thread.java:745)
  </code></pre>