fix npe when GitHookBranchProvider tries to collect a tag as branch, see issue #865

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

@@ -33,6 +33,7 @@ package sonia.scm.repository.api;
 
 //~--- non-JDK imports --------------------------------------------------------
 
+import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableList.Builder;
 
@@ -45,18 +46,24 @@ import sonia.scm.repository.GitUtil;
 
 import java.util.List;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
- *
+ * Collects created, modified and deleted git branches during a hook.
+ * 
  * @author Sebastian Sdorra
  */
 public class GitHookBranchProvider implements HookBranchProvider
 {
+    
+  private static final Logger logger = LoggerFactory.getLogger(GitHookBranchProvider.class);
 
   /**
-   * Constructs ...
+   * Constructs a new instance.
    *
    *
-   * @param commands
+   * @param commands received git commands
    */
   public GitHookBranchProvider(List<ReceiveCommand> commands)
   {
@@ -66,10 +73,14 @@ public class GitHookBranchProvider implements HookBranchProvider
     for (ReceiveCommand command : commands)
     {
       Type type = command.getType();
-      String branch = GitUtil.getBranch(command.getRefName());
+      String ref = command.getRefName();
+      String branch = GitUtil.getBranch(ref);
 
-      if ((type == Type.CREATE) || (type == Type.UPDATE)
-        || (type == Type.UPDATE_NONFASTFORWARD))
+      if (Strings.isNullOrEmpty(branch))
+      {
+        logger.debug("ref {} is not a branch", ref);
+      }
+      else if (isCreateOrUpdate(type))
       {
         createdOrModifiedBuilder.add(branch);
       }
@@ -82,27 +93,19 @@ public class GitHookBranchProvider implements HookBranchProvider
     createdOrModified = createdOrModifiedBuilder.build();
     deletedOrClosed = deletedOrClosedBuilder.build();
   }
+  
+  private boolean isCreateOrUpdate(Type type){
+    return type == Type.CREATE || type == Type.UPDATE || type == Type.UPDATE_NONFASTFORWARD;
+  }
 
   //~--- get methods ----------------------------------------------------------
 
-  /**
-   * Method description
-   *
-   *
-   * @return
-   */
   @Override
   public List<String> getCreatedOrModified()
   {
     return createdOrModified;
   }
 
-  /**
-   * Method description
-   *
-   *
-   * @return
-   */
   @Override
   public List<String> getDeletedOrClosed()
   {
@@ -111,9 +114,7 @@ public class GitHookBranchProvider implements HookBranchProvider
 
   //~--- fields ---------------------------------------------------------------
 
-  /** Field description */
   private final List<String> createdOrModified;
 
-  /** Field description */
   private final List<String> deletedOrClosed;
 }

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

@@ -0,0 +1,115 @@
+/***
+ * Copyright (c) 2015, 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,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 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
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * 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.
+ * 
+ * https://bitbucket.org/sdorra/scm-manager
+ * 
+ */
+
+package sonia.scm.repository.api;
+
+import com.google.common.collect.Lists;
+import java.util.Arrays;
+import java.util.List;
+import org.eclipse.jgit.transport.ReceiveCommand;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+import static org.hamcrest.Matchers.*;
+import org.junit.Before;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+
+/**
+ * Unit tests for {@link GitHookBranchProvider}.
+ * 
+ * @author Sebastian Sdorra
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class GitHookBranchProviderTest {
+
+  @Mock
+  private ReceiveCommand command;
+  
+  private List<ReceiveCommand> commands;
+  
+  /**
+   * Prepare mocks for upcoming test.
+   */
+  @Before
+  public void setUpMocks(){
+    commands = Lists.newArrayList(command);
+  }
+  
+  /**
+   * Tests {@link GitHookBranchProvider#getCreatedOrModified()}.
+   */
+  @Test
+  public void testGetCreatedOrModified(){
+    List<ReceiveCommand.Type> types = Arrays.asList( 
+      ReceiveCommand.Type.CREATE, ReceiveCommand.Type.UPDATE, ReceiveCommand.Type.UPDATE_NONFASTFORWARD 
+    );
+    for ( ReceiveCommand.Type type : types ){
+      checkCreatedOrModified(type);
+    }
+  }
+  
+  private void checkCreatedOrModified(ReceiveCommand.Type type){
+    GitHookBranchProvider provider = createGitHookBranchProvider(type, "refs/heads/hello");
+    assertThat(provider.getCreatedOrModified(), Matchers.contains("hello"));
+    assertThat(provider.getDeletedOrClosed(), empty());    
+  }
+
+  
+  /**
+   * Tests {@link GitHookBranchProvider#getDeletedOrClosed()}.
+   */  
+  @Test
+  public void testGetDeletedOrClosed(){
+    GitHookBranchProvider provider = createGitHookBranchProvider(ReceiveCommand.Type.DELETE, "refs/heads/hello");
+    assertThat(provider.getDeletedOrClosed(), Matchers.contains("hello"));
+    assertThat(provider.getCreatedOrModified(), empty());
+  }
+  
+  /**
+   * Tests {@link GitHookBranchProvider} with a tag instead of a branch.
+   */
+  @Test
+  public void testWithTag(){
+    GitHookBranchProvider provider = createGitHookBranchProvider(ReceiveCommand.Type.CREATE, "refs/tags/1.0.0");
+    assertThat(provider.getCreatedOrModified(), empty());
+    assertThat(provider.getDeletedOrClosed(), empty());
+  }
+  
+  private GitHookBranchProvider createGitHookBranchProvider(ReceiveCommand.Type type, String refName){
+    when(command.getType()).thenReturn(type);
+    when(command.getRefName()).thenReturn(refName);
+    return new GitHookBranchProvider(commands);
+  }
+
+}