Wiki: do not set default branch

app/models/wiki.rb

@@ -87,8 +87,7 @@ class Wiki
   end
 
   def create_wiki_repository
-    repository.create_if_not_exists
-    change_head_to_default_branch
+    repository.create_if_not_exists(default_branch)
 
     raise CouldNotCreateWikiError unless repository_exists?
   rescue StandardError => err
@@ -322,16 +321,6 @@ class Wiki
   def default_message(action, title)
     "#{user.username} #{action} page: #{title}"
   end
-
-  def change_head_to_default_branch
-    # If the wiki has commits in the 'HEAD' branch means that the current
-    # HEAD is pointing to the right branch. If not, it could mean that either
-    # the repo has just been created or that 'HEAD' is pointing
-    # to the wrong branch and we need to rewrite it
-    return if repository.raw_repository.commit_count('HEAD') != 0
-
-    repository.raw_repository.write_ref('HEAD', "refs/heads/#{default_branch}")
-  end
 end
 
 Wiki.prepend_mod_with('Wiki')

ee/spec/models/group_wiki_spec.rb

@@ -12,14 +12,15 @@ RSpec.describe GroupWiki do
     end
 
     describe '#create_wiki_repository' do
+      let(:shard) { 'foo' }
+
       it 'tracks the repository storage in the database' do
-        shard = 'foo'
         # Use a custom storage shard value, to make sure we're not falling back to the default.
         allow(subject).to receive(:repository_storage).and_return(shard)
+        allow(subject).to receive(:default_branch).and_return('bar')
 
         # Don't actually create the repository, because the storage shard doesn't exist.
         expect(subject.repository).to receive(:create_if_not_exists)
-        expect(subject).to receive(:change_head_to_default_branch)
         allow(subject).to receive(:repository_exists?).and_return(true)
 
         expect(subject).to receive(:track_wiki_repository).with(shard)

spec/support/shared_examples/models/wiki_shared_examples.rb

@@ -599,36 +599,13 @@ RSpec.shared_examples 'wiki model' do
     context 'when repository is empty' do
       let(:wiki_container) { wiki_container_without_repo }
 
-      it 'changes the HEAD reference to the default branch' do
-        wiki.repository.create_if_not_exists
-        wiki.repository.raw_repository.write_ref('HEAD', 'refs/heads/bar')
+      it 'creates the repository with the default branch' do
+        wiki.repository.create_if_not_exists(default_branch)
 
         subject
 
         expect(File.read(head_path).squish).to eq "ref: refs/heads/#{default_branch}"
       end
     end
-
-    context 'when repository is not empty' do
-      before do
-        wiki.create_page('index', 'test content')
-      end
-
-      it 'does nothing when HEAD points to the right branch' do
-        expect(wiki.repository.raw_repository).not_to receive(:write_ref)
-
-        subject
-      end
-
-      context 'when HEAD points to the wrong branch' do
-        it 'rewrites HEAD with the right branch' do
-          wiki.repository.raw_repository.write_ref('HEAD', 'refs/heads/bar')
-
-          subject
-
-          expect(File.read(head_path).squish).to eq "ref: refs/heads/#{default_branch}"
-        end
-      end
-    end
   end
 end