Suggest default_branch_name when available

app/views/projects/empty.html.haml

 - @content_class = "limit-container-width" unless fluid_layout
+- default_branch_name = Gitlab::CurrentSettings.default_branch_name.presence || "master"
 - breadcrumb_title _("Details")
 - page_title _("Details")
 
@@ -47,7 +48,7 @@
               git commit -m "add README"
             - if @project.can_current_user_push_to_default_branch?
               %span><
-                git push -u origin master
+                git push -u origin #{ default_branch_name }
 
         %fieldset
           %h5= _('Push an existing folder')
@@ -60,7 +61,7 @@
               git commit -m "Initial commit"
             - if @project.can_current_user_push_to_default_branch?
               %span><
-                git push -u origin master
+                git push -u origin #{ default_branch_name }
 
         %fieldset
           %h5= _('Push an existing Git repository')

spec/features/projects/show/user_sees_git_instructions_spec.rb

@@ -18,6 +18,8 @@ RSpec.describe 'Projects > Show > User sees Git instructions' do
       page.within '.empty-wrapper' do
         expect(page).to have_content('Command line instructions')
       end
+
+      expect(page).to have_content("git push -u origin master")
     end
   end
 
@@ -59,6 +61,25 @@ RSpec.describe 'Projects > Show > User sees Git instructions' do
       include_examples 'shows details of empty project with no repo'
     end
 
+    context ":default_branch_name is specified" do
+      let_it_be(:project) { create(:project, :public) }
+
+      before do
+        expect(Gitlab::CurrentSettings)
+          .to receive(:default_branch_name)
+          .and_return('example_branch')
+
+        sign_in(project.owner)
+        visit project_path(project)
+      end
+
+      it "recommends default_branch_name instead of master" do
+        click_link 'Create empty repository'
+
+        expect(page).to have_content("git push -u origin example_branch")
+      end
+    end
+
     context 'when project is empty' do
       let_it_be(:project) { create(:project_empty_repo, :public) }