Fix error preventing displaying of commit data for a directory with a leading dot

Closes https://github.com/gitlabhq/gitlabhq/issues/8763

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.1.0 (unreleased)
+  - Fix error preventing displaying of commit data for a directory with a leading dot (Stan Hu)
   - Make diff file view easier to use on mobile screens (Stan Hu)
   - Add support for creating directories from Files page (Stan Hu)
   - Allow removing of project without confirmation when JavaScript is disabled (Stan Hu)

app/controllers/projects/refs_controller.rb

@@ -3,6 +3,7 @@ class Projects::RefsController < Projects::ApplicationController
   include TreeHelper
 
   before_action :require_non_empty_project
+  before_action :validate_ref_id
   before_action :assign_ref_vars
   before_action :authorize_download_code!
 
@@ -71,4 +72,10 @@ class Projects::RefsController < Projects::ApplicationController
       format.js
     end
   end
+
+  private
+
+  def validate_ref_id
+    return not_found! if params[:id].present? && params[:id] !~ Gitlab::Regex.git_reference_regex
+  end
 end

config/routes.rb

@@ -543,8 +543,10 @@ Gitlab::Application.routes.draw do
           member do
             # tree viewer logs
             get 'logs_tree', constraints: { id: Gitlab::Regex.git_reference_regex }
+            # Directories with leading dots erroneously get rejected if git
+            # ref regex used in constraints. Regex verification now done in controller.
             get 'logs_tree/*path' => 'refs#logs_tree', as: :logs_file, constraints: {
-              id: Gitlab::Regex.git_reference_regex,
+              id: /.*/,
               path: /.*/
             }
           end

features/project/source/browse_files.feature

@@ -205,3 +205,9 @@ Feature: Project Source Browse Files
     And I see the ref 'test' has been selected
     And I visit the 'test' tree
     Then I see the commit data
+
+  @javascript
+  Scenario: I browse code with a leading dot in the directory
+    Given I switch ref to fix
+    And I visit the fix tree
+    Then I see the commit data for a directory with a leading dot

features/steps/project/source/browse_files.rb

@@ -286,6 +286,10 @@ class Spinach::Features::ProjectSourceBrowseFiles < Spinach::FeatureSteps
     select "'test'", from: 'ref'
   end
 
+  step "I switch ref to fix" do
+    select "fix", from: 'ref'
+  end
+
   step "I see the ref 'test' has been selected" do
     expect(page).to have_selector '.select2-chosen', text: "'test'"
   end
@@ -294,11 +298,20 @@ class Spinach::Features::ProjectSourceBrowseFiles < Spinach::FeatureSteps
     visit namespace_project_tree_path(@project.namespace, @project, "'test'")
   end
 
+  step "I visit the fix tree" do
+    visit namespace_project_tree_path(@project.namespace, @project, "fix/.testdir")
+  end
+
   step 'I see the commit data' do
     expect(page).to have_css('.tree-commit-link', visible: true)
     expect(page).not_to have_content('Loading commit data...')
   end
 
+  step 'I see the commit data for a directory with a leading dot' do
+    expect(page).to have_css('.tree-commit-link', visible: true)
+    expect(page).not_to have_content('Loading commit data...')
+  end
+
   private
 
   def set_new_content

spec/support/test_env.rb

@@ -9,7 +9,7 @@ module TestEnv
     'flatten-dir'      => 'e56497b',
     'feature'          => '0b4bc9a',
     'feature_conflict' => 'bb5206f',
-    'fix'              => '12d65c8',
+    'fix'              => '48f0be4',
     'improve/awesome'  => '5937ac0',
     'markdown'         => '0ed8c6c',
     'master'           => '5937ac0',