Merge branch 'support-utf8-wiki-page-title' into 'master'

Support Wiki with UTF-8 page name

## What does this MR do?

Support Wiki with UTF-8 page name.

See https://github.com/gollum/gollum/pull/929

## Why was this MR needed?

Relax constraints for wiki slug in aac6598482036e12a20b4c75f2a508bd6a017245.

It allows to create a wiki with UTF-8 name, but creating a wiki with UTF-8 name causes 500 error.

Creating a wiki with UTF-8 name once, then creating or updating wiki with ascii name also cause 500 error i.e. no one can create and update any wiki pages in the project.

## Workaround

1. Go to `https://DOMAIN/repo/wikis/git_access` -> this page display the link to git clone
2. Clone the wiki repo
3. Find the page with UTF-8 name
4. Rename or Delete these files
5. Commit and push

## What are the relevant issue numbers?

- #13979
- #13891
- #13698
- #13603
- #13317
- #12906
- #12825
- #10945 

## Todo

- [x] Waiting for 'gollum-rugged_adapter' that support rugged v0.24.0 release

'gollum-rugged_adapter' gem doesn't allow to install rugged v0.24.0 (it's still beta version),
but 'gitlab_git' gem depends on rugged v0.24.0b13.

So it can't install both 'gollum-rugged_adapter' and 'gitlab_git' now.


See merge request !2999

6 files changed, 27 insertions, 7 deletions

diff --git a/CHANGELOG b/CHANGELOG
index dc8c7040386..fcf659c07f9 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -10,6 +10,7 @@ v 8.6.0 (unreleased)
     setup. A password can be provided during setup (see installation docs), or
     GitLab will ask the user to create a new one upon first visit.
   - Fix issue when pushing to projects ending in .wiki
+  - Add support for wiki with UTF-8 page names (Hiroyuki Sato)
   - Don't load all of GitLab in mail_room
   - Update `omniauth-saml` to 1.5.0 to allow for custom response attributes to be set
   - Memoize @group in Admin::GroupsController (Yatish Mehta)
diff --git a/Gemfile b/Gemfile
index a0e8e796627..a849d7493a7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,7 +58,9 @@ gem "gitlab_git", '~> 9.0'
 gem 'gitlab_omniauth-ldap', '~> 1.2.1', require: "omniauth-ldap"
 
 # Git Wiki
-gem 'gollum-lib', '~> 4.1.0'
+# Required manually in config/initializers/gollum.rb to control load order
+gem 'gollum-lib', '~> 4.1.0', require: false
+gem 'gollum-rugged_adapter', '~> 0.4.2', require: false
 
 # Language detection
 gem "github-linguist", "~> 4.7.0", require: "linguist"
diff --git a/Gemfile.lock b/Gemfile.lock
index f4f5649eb75..669bfcf4d6b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -381,6 +381,9 @@ GEM
       rouge (~> 1.9)
       sanitize (~> 2.1.0)
       stringex (~> 2.5.1)
+    gollum-rugged_adapter (0.4.2)
+      mime-types (>= 1.15)
+      rugged (~> 0.24.0, >= 0.21.3)
     gon (6.0.1)
       actionpack (>= 3.0)
       json
@@ -703,7 +706,7 @@ GEM
     rubyntlm (0.5.2)
     rubypants (0.2.0)
     rufus-scheduler (3.1.10)
-    rugged (0.24.0b13)
+    rugged (0.24.0)
     safe_yaml (1.0.4)
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)
@@ -941,6 +944,7 @@ DEPENDENCIES
   gitlab_meta (= 7.0)
   gitlab_omniauth-ldap (~> 1.2.1)
   gollum-lib (~> 4.1.0)
+  gollum-rugged_adapter (~> 0.4.2)
   gon (~> 6.0.1)
   grape (~> 0.13.0)
   grape-entity (~> 0.4.2)
diff --git a/app/models/project_wiki.rb b/app/models/project_wiki.rb
index c96e6f0b8ea..59b1b86d1fb 100644
--- a/app/models/project_wiki.rb
+++ b/app/models/project_wiki.rb
@@ -2,7 +2,7 @@ class ProjectWiki
   include Gitlab::ShellAdapter
 
   MARKUPS = {
-    'Markdown' => :md,
+    'Markdown' => :markdown,
     'RDoc'     => :rdoc,
     'AsciiDoc' => :asciidoc
   } unless defined?(MARKUPS)
@@ -47,7 +47,7 @@ class ProjectWiki
   def wiki
     @wiki ||= begin
       Gollum::Wiki.new(path_to_repo)
-    rescue Gollum::NoSuchPathError
+    rescue Rugged::OSError
       create_repo!
     end
   end
@@ -90,7 +90,7 @@ class ProjectWiki
   def create_page(title, content, format = :markdown, message = nil)
     commit = commit_details(:created, message, title)
 
-    wiki.write_page(title, format, content, commit)
+    wiki.write_page(title, format.to_sym, content, commit)
 
     update_project_activity
   rescue Gollum::DuplicatePageError => e
@@ -101,7 +101,7 @@ class ProjectWiki
   def update_page(page, content, format = :markdown, message = nil)
     commit = commit_details(:updated, message, page.title)
 
-    wiki.update_page(page, page.name, format, content, commit)
+    wiki.update_page(page, page.name, format.to_sym, content, commit)
 
     update_project_activity
   end
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index dbd70dc5a44..526760779a4 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -62,7 +62,7 @@ class WikiPage
   # The raw content of this page.
   def content
     @attributes[:content] ||= if @page
-                                @page.raw_data
+                                @page.text_data
                               end
   end
 
diff --git a/config/initializers/gollum.rb b/config/initializers/gollum.rb
new file mode 100644
index 00000000000..703f24f93b2
--- /dev/null
+++ b/config/initializers/gollum.rb
@@ -0,0 +1,13 @@
+module Gollum
+  GIT_ADAPTER = "rugged"
+end
+require "gollum-lib"
+
+module Gollum
+  class Committer
+    # Patch for UTF-8 path
+    def method_missing(name, *args)
+      index.send(name, *args)
+    end
+  end
+end