added option to disallow non fast-forward git pushes

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

@@ -51,9 +51,18 @@ public class GitConfig extends SimpleRepositoryConfig {
   @XmlElement(name = "gc-expression")
   private String gcExpression;
 
-  public String getGcExpression()
-  {
+  @XmlElement(name = "disallow-non-fast-forward")
+  private boolean nonFastForwardDisallowed;
+
+  public String getGcExpression() {
     return gcExpression;
   }
-  
+
+  public boolean isNonFastForwardDisallowed() {
+    return nonFastForwardDisallowed;
+  }
+
+  public void setNonFastForwardDisallowed(boolean nonFastForwardDisallowed) {
+    this.nonFastForwardDisallowed = nonFastForwardDisallowed;
+  }
 }

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/web/GitReceivePackFactory.java

@@ -35,79 +35,63 @@ package sonia.scm.web;
 
 //~--- non-JDK imports --------------------------------------------------------
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.inject.Inject;
-
 import org.eclipse.jgit.http.server.resolver.DefaultReceivePackFactory;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.transport.ReceivePack;
 import org.eclipse.jgit.transport.resolver.ReceivePackFactory;
 import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
 import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
-
 import sonia.scm.repository.GitRepositoryHandler;
 import sonia.scm.repository.spi.HookEventFacade;
 
-//~--- JDK imports ------------------------------------------------------------
-
 import javax.servlet.http.HttpServletRequest;
 
+//~--- JDK imports ------------------------------------------------------------
+
 /**
+ * GitReceivePackFactory creates {@link ReceivePack} objects and assigns the required
+ * Hook components.
  *
  * @author Sebastian Sdorra
  */
-public class GitReceivePackFactory
-  implements ReceivePackFactory<HttpServletRequest>
+public class GitReceivePackFactory implements ReceivePackFactory<HttpServletRequest>
 {
 
-  /**
-   * Constructs ...
-   *
-   *
-   *
-   * @param hookEventFacade
-   * @param handler
-   */
+  private final GitRepositoryHandler handler;
+
+  private ReceivePackFactory wrapped;
+
+  private final GitReceiveHook hook;
+
   @Inject
-  public GitReceivePackFactory(HookEventFacade hookEventFacade,
-    GitRepositoryHandler handler)
-  {
-    hook = new GitReceiveHook(hookEventFacade, handler);
+  public GitReceivePackFactory(GitRepositoryHandler handler, HookEventFacade hookEventFacade) {
+    this.handler = handler;
+    this.hook = new GitReceiveHook(hookEventFacade, handler);
+    this.wrapped =  new DefaultReceivePackFactory();
   }
 
-  //~--- methods --------------------------------------------------------------
-
-  /**
-   * Method description
-   *
-   *
-   * @param request
-   * @param repository
-   *
-   * @return
-   *
-   * @throws ServiceNotAuthorizedException
-   * @throws ServiceNotEnabledException
-   */
   @Override
   public ReceivePack create(HttpServletRequest request, Repository repository)
-    throws ServiceNotEnabledException, ServiceNotAuthorizedException
-  {
-    ReceivePack rpack = defaultFactory.create(request, repository);
+    throws ServiceNotEnabledException, ServiceNotAuthorizedException {
+    ReceivePack receivePack = wrapped.create(request, repository);
+    receivePack.setAllowNonFastForwards(isNonFastForwardAllowed());
 
-    rpack.setPreReceiveHook(hook);
-    rpack.setPostReceiveHook(hook);
+    receivePack.setPreReceiveHook(hook);
+    receivePack.setPostReceiveHook(hook);
     // apply collecting listener, to be able to check which commits are new
-    CollectingPackParserListener.set(rpack);
+    CollectingPackParserListener.set(receivePack);
     
-    return rpack;
+    return receivePack;
   }
 
-  //~--- fields ---------------------------------------------------------------
+  private boolean isNonFastForwardAllowed() {
+    return ! handler.getConfig().isNonFastForwardDisallowed();
+  }
 
-  /** Field description */
-  private DefaultReceivePackFactory defaultFactory =
-    new DefaultReceivePackFactory();
-
-  /** Field description */
-  private GitReceiveHook hook;
+  @VisibleForTesting
+  void setWrapped(ReceivePackFactory wrapped) {
+    this.wrapped = wrapped;
+  }
 }