Merge branch 'kerberos_access_wikis' into 'master'

Fix Git access panel for Wikis when Kerberos authentication is enabled

When Kerberos authentication is enabled, the `Git Access` panel for project's Wiki return a 500 Error. Details in #1109   
The MR provides the missing code to generate the Kerberos URL for Wiki projects.  
Closes #1109

See merge request !795

CHANGELOG-EE

@@ -3,6 +3,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 v 8.13.0 (unreleased)
   - Fix 500 error updating mirror URLs for projects
   - Fix validations related to mirroring settings form. !773
+  - Fix Git access panel for Wikis when Kerberos authentication is enabled (Borja Aparicio)
 
 v 8.12.5
   - No EE-specific changes

app/models/project_wiki.rb

@@ -45,6 +45,11 @@ class ProjectWiki
     [Gitlab.config.gitlab.url, "/", path_with_namespace, ".git"].join('')
   end
 
+  # No need to have a Kerberos Web url. Kerberos URL will be used only to clone
+  def kerberos_url_to_repo
+    [Gitlab.config.build_gitlab_kerberos_url, "/", path_with_namespace, ".git"].join('')
+  end
+
   def wiki_base_path
     [Gitlab.config.gitlab.relative_url_root, "/", @project.path_with_namespace, "/wikis"].join('')
   end

spec/models/project_wiki_spec.rb

@@ -42,6 +42,14 @@ describe ProjectWiki, models: true do
     end
   end
 
+  describe "#kerberos_url_to_repo" do
+    it 'returns valid kerberos url for this repo' do
+      gitlab_kerberos_url = Gitlab.config.build_gitlab_kerberos_url
+      repo_kerberos_url = "#{gitlab_kerberos_url}/#{subject.path_with_namespace}.git"
+      expect(subject.kerberos_url_to_repo).to eq(repo_kerberos_url)
+    end
+  end
+
   describe "#wiki_base_path" do
     it "returns the wiki base path" do
       wiki_base_path = "#{Gitlab.config.gitlab.relative_url_root}/#{project.path_with_namespace}/wikis"