#998 git: set repository head to default branch

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/repository/GitHeadHandler.java

@@ -0,0 +1,53 @@
+package sonia.scm.repository;
+
+import com.google.common.base.Charsets;
+import com.google.common.base.Throwables;
+import com.google.common.io.Files;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import java.io.File;
+import java.io.IOException;
+
+@Singleton
+public class GitHeadHandler implements GitHeadResolver, GitHeadModifier {
+
+  private final GitRepositoryHandler repositoryHandler;
+
+  @Inject
+  public GitHeadHandler(GitRepositoryHandler repositoryHandler) {
+    this.repositoryHandler = repositoryHandler;
+  }
+
+  @Override
+  public String resolve(Repository repository) {
+    File headFile = findHeadFile(repository);
+    try {
+      String line = Files.readFirstLine(headFile, Charsets.UTF_8);
+      // TODO handle invalid head file
+      int index = line.indexOf(GitUtil.REF_HEAD_PREFIX);
+      return line.substring(index + GitUtil.REF_HEAD_PREFIX.length());
+    } catch (IOException e) {
+      // TODO
+      throw Throwables.propagate(e);
+    }
+  }
+
+  @Override
+  public void modify(Repository repository, String head) {
+    File headFile = findHeadFile(repository);
+    try {
+      String line = "ref: " + GitUtil.REF_HEAD_PREFIX + head + "\n";
+      Files.write(line, headFile, Charsets.UTF_8);
+    } catch (IOException e) {
+      // TODO
+      throw Throwables.propagate(e);
+    }
+  }
+
+  private File findHeadFile(Repository repository) {
+    // TODO handle non bare repositories
+    File directory = repositoryHandler.getDirectory(repository);
+    return new File(directory, "HEAD");
+  }
+}

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/repository/GitHeadModifier.java

@@ -0,0 +1,7 @@
+package sonia.scm.repository;
+
+public interface GitHeadModifier {
+
+  void modify(Repository repository, String head);
+
+}

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/repository/GitHeadResolver.java

@@ -0,0 +1,7 @@
+package sonia.scm.repository;
+
+public interface GitHeadResolver {
+
+  String resolve(Repository repository);
+
+}

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/repository/GitRepositoryModifyListener.java

@@ -32,6 +32,7 @@ package sonia.scm.repository;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Objects;
+import com.google.common.base.Strings;
 import com.google.common.eventbus.Subscribe;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -40,58 +41,74 @@ import sonia.scm.HandlerEvent;
 import sonia.scm.event.ScmEventBus;
 import sonia.scm.plugin.ext.Extension;
 
+import javax.inject.Inject;
+
 /**
  * Repository listener which handles git related repository events.
- * 
+ *
  * @author Sebastian Sdorra
  * @since 1.50
  */
 @Extension
 @EagerSingleton
 public class GitRepositoryModifyListener {
-  
+
   /**
    * the logger for GitRepositoryModifyListener
    */
   private static final Logger logger = LoggerFactory.getLogger(GitRepositoryModifyListener.class);
-  
+
+  private final GitHeadResolver headResolver;
+  private final GitHeadModifier headModifier;
+
+  @Inject
+  public GitRepositoryModifyListener(GitHeadResolver headResolver, GitHeadModifier headModifier) {
+    this.headResolver = headResolver;
+    this.headModifier = headModifier;
+  }
+
   /**
    * Receives {@link RepositoryModificationEvent} and fires a {@link ClearRepositoryCacheEvent} if
    * the default branch of a git repository was modified.
-   * 
+   *
    * @param event repository modification event
    */
   @Subscribe
   public void handleEvent(RepositoryModificationEvent event){
     Repository repository = event.getItem();
-    
-    if ( isModifyEvent(event) && 
-         isGitRepository(event.getItem()) && 
-         hasDefaultBranchChanged(event.getItemBeforeModification(), repository)) 
+
+    if ( isModifyEvent(event) && isGitRepository(event.getItem()) )
     {
-      logger.info("git default branch of repository {} has changed, sending clear cache event", repository.getId());
-      sendClearRepositoryCacheEvent(repository);
+      if (hasDefaultBranchChanged(event.getItemBeforeModification(), repository)) {
+        logger.info("git default branch of repository {} has changed, sending clear cache event", repository.getId());
+        sendClearRepositoryCacheEvent(repository);
+      }
+
+      String defaultBranch = repository.getProperty(GitConstants.PROPERTY_DEFAULT_BRANCH);
+      if (defaultBranch != null && ! defaultBranch.equals(headResolver.resolve(repository))) {
+        headModifier.modify(repository, defaultBranch);
+      }
     }
   }
-  
+
   @VisibleForTesting
   protected void sendClearRepositoryCacheEvent(Repository repository) {
-    ScmEventBus.getInstance().post(new ClearRepositoryCacheEvent(repository));    
+    ScmEventBus.getInstance().post(new ClearRepositoryCacheEvent(repository));
   }
-  
+
   private boolean isModifyEvent(RepositoryEvent event) {
     return event.getEventType() == HandlerEvent.MODIFY;
   }
-  
+
   private boolean isGitRepository(Repository repository) {
     return GitRepositoryHandler.TYPE_NAME.equals(repository.getType());
   }
-  
+
   private boolean hasDefaultBranchChanged(Repository old, Repository current) {
     return !Objects.equal(
-      old.getProperty(GitConstants.PROPERTY_DEFAULT_BRANCH), 
+      old.getProperty(GitConstants.PROPERTY_DEFAULT_BRANCH),
       current.getProperty(GitConstants.PROPERTY_DEFAULT_BRANCH)
     );
   }
-  
+
 }

scm-plugins/scm-git-plugin/src/test/java/sonia/scm/repository/GitHeadHandlerTest.java

@@ -0,0 +1,60 @@
+package sonia.scm.repository;
+
+import com.google.common.base.Charsets;
+import com.google.common.io.Files;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+
+import java.io.File;
+import java.io.IOException;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.when;
+
+@RunWith(MockitoJUnitRunner.class)
+public class GitHeadHandlerTest {
+
+  @Rule
+  public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+  @Mock
+  private GitRepositoryHandler repositoryHandler;
+
+  @InjectMocks
+  private GitHeadHandler headHandler;
+
+  @Test
+  public void testResolve() throws IOException {
+    Repository repository = RepositoryTestData.createHeartOfGold("git");
+    create(repository, "master");
+
+    String head = headHandler.resolve(repository);
+    assertEquals("master", head);
+  }
+
+  @Test
+  public void testModify() throws IOException {
+    Repository repository = RepositoryTestData.createHeartOfGold("git");
+    File file = create(repository, "master");
+
+    headHandler.modify(repository, "develop");
+
+    assertEquals("ref: refs/heads/develop", Files.readFirstLine(file, Charsets.UTF_8));
+  }
+
+  private File create(Repository repository, String head) throws IOException {
+    File directory = temporaryFolder.newFolder();
+    File headFile = new File(directory, "HEAD");
+    Files.write(String.format("ref: refs/heads/%s\n", head), headFile, Charsets.UTF_8);
+
+    when(repositoryHandler.getDirectory(repository)).thenReturn(directory);
+
+    return headFile;
+  }
+
+}

scm-plugins/scm-git-plugin/src/test/java/sonia/scm/repository/GitRepositoryModifyListenerTest.java

@@ -1,10 +1,10 @@
 /**
  * Copyright (c) 2014, Sebastian Sdorra
  * All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
- * 
+ *
  * 1. Redistributions of source code must retain the above copyright notice,
  *    this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
@@ -13,7 +13,7 @@
  * 3. Neither the name of SCM-Manager; nor the names of its
  *    contributors may be used to endorse or promote products derived from this
  *    software without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
@@ -24,34 +24,42 @@
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * 
+ *
  * http://bitbucket.org/sdorra/scm-manager
- * 
+ *
  */
 
 package sonia.scm.repository;
 
 import org.junit.Test;
 import static org.junit.Assert.*;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
 import org.junit.Before;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
 import sonia.scm.HandlerEvent;
 
 /**
  * Unit tests for {@link GitRepositoryModifyListener}.
- * 
+ *
  * @author Sebastian Sdorra
  */
+@RunWith(MockitoJUnitRunner.class)
 public class GitRepositoryModifyListenerTest {
 
+  @Mock
+  private GitHeadResolver headResolver;
+
+  @Mock
+  private GitHeadModifier headModifier;
+
+  @InjectMocks
   private GitRepositoryModifyTestListener repositoryModifyListener;
-  
-  /**
-   * Set up test object.
-   */
-  @Before
-  public void setUpObjectUnderTest(){
-    repositoryModifyListener = new GitRepositoryModifyTestListener();
-  }
 
   /**
    * Tests happy path.
@@ -62,14 +70,14 @@ public class GitRepositoryModifyListenerTest {
     old.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "master");
     Repository current = RepositoryTestData.createHeartOfGold("git");
     current.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "develop");
-    
+
     RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.MODIFY);
     repositoryModifyListener.handleEvent(event);
-    
+
     assertNotNull(repositoryModifyListener.repository);
     assertSame(current, repositoryModifyListener.repository);
   }
-  
+
   /**
    * Tests with new default branch.
    */
@@ -78,14 +86,14 @@ public class GitRepositoryModifyListenerTest {
     Repository old = RepositoryTestData.createHeartOfGold("git");
     Repository current = RepositoryTestData.createHeartOfGold("git");
     current.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "develop");
-    
+
     RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.MODIFY);
     repositoryModifyListener.handleEvent(event);
-    
+
     assertNotNull(repositoryModifyListener.repository);
     assertSame(current, repositoryModifyListener.repository);
   }
-  
+
   /**
    * Tests with non git repositories.
    */
@@ -95,13 +103,13 @@ public class GitRepositoryModifyListenerTest {
     old.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "master");
     Repository current = RepositoryTestData.createHeartOfGold("hg");
     current.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "develop");
-    
+
     RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.MODIFY);
     repositoryModifyListener.handleEvent(event);
-    
+
     assertNull(repositoryModifyListener.repository);
   }
-  
+
   /**
    * Tests without default branch.
    */
@@ -109,13 +117,13 @@ public class GitRepositoryModifyListenerTest {
   public void testWithoutDefaultBranch(){
     Repository old = RepositoryTestData.createHeartOfGold("git");
     Repository current = RepositoryTestData.createHeartOfGold("git");
-    
+
     RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.MODIFY);
     repositoryModifyListener.handleEvent(event);
-    
+
     assertNull(repositoryModifyListener.repository);
   }
-  
+
   /**
    * Tests with non modify event.
    */
@@ -125,13 +133,13 @@ public class GitRepositoryModifyListenerTest {
     old.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "master");
     Repository current = RepositoryTestData.createHeartOfGold("git");
     current.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "develop");
-    
+
     RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.CREATE);
     repositoryModifyListener.handleEvent(event);
-    
+
     assertNull(repositoryModifyListener.repository);
   }
-  
+
   /**
    * Tests with non git repositories.
    */
@@ -144,20 +152,52 @@ public class GitRepositoryModifyListenerTest {
 
     RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.MODIFY);
     repositoryModifyListener.handleEvent(event);
-    
+
     assertNull(repositoryModifyListener.repository);
   }
- 
+
+  @Test
+  public void testModifyRepositoryHead() {
+    Repository old = RepositoryTestData.createHeartOfGold("git");
+    Repository current = RepositoryTestData.createHeartOfGold("git");
+    current.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "develop");
+
+    when(headResolver.resolve(current)).thenReturn("master");
+
+    RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.MODIFY);
+    repositoryModifyListener.handleEvent(event);
+
+    verify(headModifier).modify(current, "develop");
+  }
+
+  @Test
+  public void testWithEqualHeads() {
+    Repository old = RepositoryTestData.createHeartOfGold("git");
+    Repository current = RepositoryTestData.createHeartOfGold("git");
+    current.setProperty(GitConstants.PROPERTY_DEFAULT_BRANCH, "develop");
+
+    when(headResolver.resolve(current)).thenReturn("develop");
+
+    RepositoryModificationEvent event = new RepositoryModificationEvent(current, old, HandlerEvent.MODIFY);
+    repositoryModifyListener.handleEvent(event);
+
+    verify(headModifier, never()).modify(current, "develop");
+  }
+
   private static class GitRepositoryModifyTestListener extends GitRepositoryModifyListener {
-    
+
     private Repository repository;
-    
+
+    public GitRepositoryModifyTestListener(GitHeadResolver headResolver, GitHeadModifier headModifier) {
+      super(headResolver, headModifier);
+    }
+
     @Override
     protected void sendClearRepositoryCacheEvent(Repository repository) {
       this.repository = repository;
-    } 
-    
-  }
-  
+    }
 
-}
+  }
+
+
+}