Mirror repository should not allow fork

templates/repo/header.tmpl

@@ -29,7 +29,7 @@
 					    {{.NumStars}}
 					  </a>
 					</div>
-					{{if not .IsBare}}
+					{{if .CanBeForked}}
 					<div class="ui labeled button" tabindex="0">
 					  <a class="ui grey button {{if eq .OwnerID $.SignedUserID}}poping up{{end}}" {{if not (eq .OwnerID $.SignedUserID)}}href="{{AppSubUrl}}/repo/fork/{{.ID}}"{{else}} data-content="{{$.i18n.Tr "repo.fork_from_self"}}" data-position="top center" data-variation="tiny"{{end}}>
 					    <i class="icon octicon octicon-repo-forked"></i>{{$.i18n.Tr "repo.fork"}}

templates/repo/header_old.tmpl

@@ -48,7 +48,7 @@
                     </button>
                 </a>
             </li>
-            {{if not .IsBare}}
+            {{if .CanBeForked}}
             <li id="repo-header-fork">
                 <a id="repo-header-fork-btn" {{if or (not $.IsRepositoryAdmin) $.Owner.IsOrganization}}href="{{AppSubUrl}}/repo/fork/{{.ID}}"{{end}}>
                     <button class="btn btn-gray text-bold btn-radius">