Add read-only banner to all pages

When the database is in a read-only state, display a banner on each
page informing the user they cannot write to that GitLab instance.

Closes gitlab-org/gitlab-ce#43937.

1 files changed, 25 insertions, 0 deletions

diff --git a/spec/features/read_only_spec.rb b/spec/features/read_only_spec.rb
new file mode 100644
index 00000000000..8bfaf558466
--- /dev/null
+++ b/spec/features/read_only_spec.rb
@@ -0,0 +1,25 @@
+require 'rails_helper'
+
+describe 'read-only message' do
+  set(:user) { create(:user) }
+
+  before do
+    sign_in(user)
+  end
+
+  it 'shows read-only banner when database is read-only' do
+    allow(Gitlab::Database).to receive(:read_only?).and_return(true)
+
+    visit root_dashboard_path
+
+    expect(page).to have_content('You are on a read-only GitLab instance.')
+  end
+
+  it 'does not show read-only banner when database is able to read-write' do
+    allow(Gitlab::Database).to receive(:read_only?).and_return(false)
+
+    visit root_dashboard_path
+
+    expect(page).not_to have_content('You are on a read-only GitLab instance.')
+  end
+end