diff --git a/models/models.go b/models/models.go
index 35eb4c969..4dcc447b3 100644
--- a/models/models.go
+++ b/models/models.go
@@ -20,7 +20,6 @@ import (
 var (
 	x      *xorm.Engine
 	tables []interface{}
-
 	HasEngine bool
 
 	DbCfg struct {
diff --git a/models/repo.go b/models/repo.go
index 419d034c6..d156621c8 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -177,6 +177,14 @@ func (repo *Repository) GetMirror() (err error) {
 	return err
 }
 
+func (repo *Repository) GetPath() string {
+        return RepoPath(repo.Owner.Name, repo.Name)
+}
+
+func (repo *Repository) IsOwnedBy(u *User) bool {
+        return repo.OwnerId == u.Id
+}
+
 func (repo *Repository) HasAccess(uname string) bool {
 	if err := repo.GetOwner(); err != nil {
 		return false
@@ -939,6 +947,13 @@ func DeleteRepository(uid, repoId int64, userName string) error {
 		sess.Rollback()
 		return err
 	}
+	
+	if repo.IsFork {
+                if _, err = sess.Exec("UPDATE `repository` SET num_forks = num_forks - 1 WHERE id = ?", repo.ForkId); err != nil {
+                    sess.Rollback()
+                    return err
+                }
+	}
 
 	if _, err = sess.Exec("UPDATE `user` SET num_repos = num_repos - 1 WHERE id = ?", uid); err != nil {
 		sess.Rollback()
@@ -1240,6 +1255,137 @@ func IsStaring(uid, repoId int64) bool {
 	return has
 }
 
-func ForkRepository(repoName string, uid int64) {
+func ForkRepository(u *User, oldRepo *Repository) (*Repository, error) {
+        isExist, err := IsRepositoryExist(u, oldRepo.Name)
+        if err != nil {
+            return nil, err
+        } else if isExist {
+            return nil, ErrRepoAlreadyExist
+        }
+    
+        sess := x.NewSession()
+        defer sess.Close()
+        if err = sess.Begin(); err != nil {
+            return nil, err
+        }
+    
+        repo := &Repository{
+            OwnerId:     u.Id,
+            Owner:       u,
+            Name:        oldRepo.Name,
+            LowerName:   oldRepo.LowerName,
+            Description: oldRepo.Description,
+            IsPrivate:   oldRepo.IsPrivate,
+            IsFork:      true,
+            ForkId:      oldRepo.Id,
+        }
+    
+        if _, err = sess.Insert(repo); err != nil {
+            sess.Rollback()
+            return nil, err
+        }
+    
+        var t *Team // Owner team.
+    
+        mode := WRITABLE
+        
+        access := &Access{
+            UserName: u.LowerName,
+            RepoName: path.Join(u.LowerName, repo.LowerName),
+            Mode:     mode,
+        }
+        // Give access to all members in owner team.
+        if u.IsOrganization() {
+            t, err = u.GetOwnerTeam()
+            if err != nil {
+                sess.Rollback()
+                return nil, err
+            }
+            if err = t.GetMembers(); err != nil {
+                sess.Rollback()
+                return nil, err
+            }
+            for _, u := range t.Members {
+                access.Id = 0
+                access.UserName = u.LowerName
+                if _, err = sess.Insert(access); err != nil {
+                    sess.Rollback()
+                    return nil, err
+                }
+            }
+        } else {
+            if _, err = sess.Insert(access); err != nil {
+                sess.Rollback()
+                return nil, err
+            }
+        }
+    
+        if _, err = sess.Exec(
+            "UPDATE `user` SET num_repos = num_repos + 1 WHERE id = ?", u.Id); err != nil {
+            sess.Rollback()
+            return nil, err
+        }
+    
+        // Update owner team info and count.
+        if u.IsOrganization() {
+            t.RepoIds += "$" + com.ToStr(repo.Id) + "|"
+            t.NumRepos++
+            if _, err = sess.Id(t.Id).AllCols().Update(t); err != nil {
+                sess.Rollback()
+                return nil, err
+            }
+        }
+    
+        
+    
+        if u.IsOrganization() {
+            t, err := u.GetOwnerTeam()
+            if err != nil {
+                log.Error(4, "GetOwnerTeam: %v", err)
+            } else {
+                if err = t.GetMembers(); err != nil {
+                    log.Error(4, "GetMembers: %v", err)
+                } else {
+                    for _, u := range t.Members {
+                        if err = WatchRepo(u.Id, repo.Id, true); err != nil {
+                            log.Error(4, "WatchRepo2: %v", err)
+                        }
+                    }
+                }
+            }
+        } else {
+            if err = WatchRepo(u.Id, repo.Id, true); err != nil {
+                log.Error(4, "WatchRepo3: %v", err)
+            }
+        }
+    
+        if err = NewRepoAction(u, repo); err != nil {
+            log.Error(4, "NewRepoAction: %v", err)
+        }
+        
+        if _, err = sess.Exec(
+            "UPDATE `repository` SET num_forks = num_forks + 1 WHERE id = ?", oldRepo.Id); err != nil {
+            sess.Rollback()
+            return nil, err
+        }
+        
+        if err = sess.Commit(); err != nil {
+            return nil, err
+        }
+    
+        repoPath := RepoPath(u.Name, repo.Name)
+        _, stderr, err := process.ExecTimeout(10*time.Minute,
+                fmt.Sprintf("ForkRepository: %s/%s", u.Name, repo.Name),
+                "git", "clone", oldRepo.GetPath(), repoPath)
+    
+        _, stderr, err = process.ExecDir(-1,
+            repoPath, fmt.Sprintf("CreateRepository(git update-server-info): %s", repoPath),
+            "git", "update-server-info")
+        if err != nil {
+            return nil, errors.New("CreateRepository(git update-server-info): " + stderr)
+        }
+    
+        return repo, nil
+   
 
 }
diff --git a/routers/repo/repo.go b/routers/repo/repo.go
index 5562a8400..8b18eb25b 100644
--- a/routers/repo/repo.go
+++ b/routers/repo/repo.go
@@ -217,6 +217,21 @@ func Action(ctx *middleware.Context) {
 		err = models.StarRepo(ctx.User.Id, ctx.Repo.Repository.Id, true)
 	case "unstar":
 		err = models.StarRepo(ctx.User.Id, ctx.Repo.Repository.Id, false)
+        case "fork":
+                repo, error := models.ForkRepository(ctx.User, ctx.Repo.Repository)
+                if error != nil {
+                    log.Error(4, "Action(%s): %v", ctx.Params(":action"), error)
+                    ctx.JSON(200, map[string]interface{}{
+                        "ok":  false,
+                        "err": error.Error(),
+                    })
+                    return
+                }
+                if error == nil {
+                        ctx.Redirect(setting.AppSubUrl + "/" + repo.Owner.Name + "/" + repo.Name)
+                        
+                        return
+                }
 	case "desc":
 		if !ctx.Repo.IsOwner {
 			ctx.Error(404)
diff --git a/templates/repo/diff.tmpl b/templates/repo/diff.tmpl
index 037666466..199324a16 100644
--- a/templates/repo/diff.tmpl
+++ b/templates/repo/diff.tmpl
@@ -101,6 +101,7 @@
                 <table>
                     <tbody>
                         {{range .Sections}}
+                        Test: {{ .NumLines}}
                         {{range .Lines}}
                         <tr class="{{DiffLineTypeToStr .Type}}-code nl-1 ol-1">
                             <td class="lines-num lines-num-old">
@@ -109,6 +110,7 @@
                             <td class="lines-num lines-num-new">
                                 <span rel="L1">{{if .RightIdx}}{{.RightIdx}}{{end}}</span>
                             </td>
+                            
                             <td class="lines-code">
                                 <pre>{{ToUtf8 .Content}}</pre>
                             </td>
diff --git a/templates/repo/header.tmpl b/templates/repo/header.tmpl
index 699e90461..884910d1c 100644
--- a/templates/repo/header.tmpl
+++ b/templates/repo/header.tmpl
@@ -44,14 +44,15 @@
                     </button>
                 </a>
             </li>
-            <!-- <li id="repo-header-fork">
-                <a id="repo-header-fork-btn" href="{{.RepoLink}}/action/fork">
+            <li id="repo-header-fork">
+                <a id="repo-header-fork-btn" {{if not .IsRepositoryOwner}} href="{{.RepoLink}}/action/fork"{{end}}>
                     <button class="btn btn-gray text-bold btn-radius">
                         <i class="octicon octicon-repo-forked"></i>{{.i18n.Tr "repo.fork"}}
                         <span class="num">{{.Repository.NumForks}}</span>
                     </button>
                 </a>
-            </li> -->
+            
+            </li>
         </ul>
     </div>
 </div>
\ No newline at end of file