Vary share lock setting UI

app/helpers/groups_helper.rb

@@ -65,6 +65,22 @@ module GroupsHelper
       { group_name: group.name }
   end
 
+  def share_with_group_lock_disabled
+    return false unless @group.has_parent?
+    return false unless @group.parent.share_with_group_lock?
+    return false unless @group.share_with_group_lock?
+    return false if     @group.has_owner?(current_user)
+    return true
+  end
+
+  def share_with_group_lock_help_text
+    return default_help                          unless @group.has_parent?
+    return default_help                          unless @group.parent.share_with_group_lock?
+    return parent_locked_and_has_been_overridden unless @group.share_with_group_lock?
+    return parent_locked_but_you_can_override    if     @group.has_owner?(current_user)
+    return parent_locked_so_ask_the_owner
+  end
+
   private
 
   def group_title_link(group, hidable: false, show_avatar: false)
@@ -80,4 +96,20 @@ module GroupsHelper
       output.html_safe
     end
   end
+
+  def default_help
+    "This setting will be applied to all subgroups unless overridden by a group owner."
+  end
+
+  def parent_locked_but_you_can_override
+    "This setting is applied on #{@group.parent.name}. You can override the setting or remove the share lock from the parent group."
+  end
+
+  def parent_locked_so_ask_the_owner
+    "This setting is applied on #{@group.parent.name}. To share this group with another group, ask the owner to override the setting or remove the share lock from the parent group."
+  end
+
+  def parent_locked_and_has_been_overridden
+    "This setting is applied on #{@group.parent.name} and has been overridden on this subgroup."
+  end
 end

app/views/groups/edit.html.haml

@@ -33,13 +33,13 @@
         .col-sm-10
           .checkbox
             = f.label :share_with_group_lock do
-              = f.check_box :share_with_group_lock
+              = f.check_box :share_with_group_lock, disabled: share_with_group_lock_disabled
               %strong
                 Prevent sharing a project within
                 = @group.name
                 with other groups
               %br/
-              %span.descr This setting will be applied to all subgroups unless overridden by a group owner
+              %span.descr= share_with_group_lock_help_text
 
       = render 'group_admin_settings', f: f
 

spec/views/groups/edit.html.haml_spec.rb

+require 'spec_helper'
+
+describe 'groups/edit.html.haml' do
+  include Devise::Test::ControllerHelpers
+
+  describe 'Share lock option' do
+    let(:root_owner) { create(:user) }
+    let(:root_group) { create(:group) }
+    let(:expected_label) { default_label }
+    let(:expected_help) { default_help }
+
+    before do
+      root_group.add_owner(root_owner)
+    end
+
+    shared_examples_for 'share lock option' do |checkbox_options|
+      it 'should have the correct label, help text, and checkbox options' do
+        assign(:group, test_group)
+        allow(view).to receive(:can?).and_return(true)
+        allow(view).to receive(:can_change_group_visibility_level?).and_return(false)
+        allow(view).to receive(:current_user).and_return(test_user)
+
+        render
+
+        expect(rendered).to have_content(expected_label)
+        expect(rendered).to have_css('.descr', text: expected_help)
+        expect(rendered).to have_field('group_share_with_group_lock', checkbox_options)
+      end
+    end
+
+    context 'for a root group' do
+      let(:test_group) { root_group }
+      let(:test_user) { root_owner }
+
+      it_behaves_like 'share lock option', { disabled: false, checked: false }
+    end
+
+    context 'for a subgroup', :nested_groups do
+      let!(:subgroup) { create(:group, parent: root_group) }
+      let(:sub_owner) { create(:user) }
+      let(:test_group) { subgroup }
+
+      context 'when the root_group has "Share lock" disabled' do
+        context 'when the subgroup has "Share lock" disabled' do
+          context 'as the root_owner' do
+            let(:test_user) { root_owner }
+
+            it_behaves_like 'share lock option', { disabled: false, checked: false }
+          end
+
+          context 'as the sub_owner' do
+            let(:test_user) { sub_owner }
+
+            it_behaves_like 'share lock option', { disabled: false, checked: false }
+          end
+        end
+
+        context 'when the subgroup has "Share lock" enabled' do
+          before do
+            subgroup.update_column(:share_with_group_lock, true)
+          end
+
+          context 'as the root_owner' do
+            let(:test_user) { root_owner }
+
+            it_behaves_like 'share lock option', { disabled: false, checked: true }
+          end
+
+          context 'as the sub_owner' do
+            let(:test_user) { sub_owner }
+
+            it_behaves_like 'share lock option', { disabled: false, checked: true }
+          end
+        end
+      end
+
+      context 'when the root_group has "Share lock" enabled' do
+        before do
+          root_group.update_column(:share_with_group_lock, true)
+        end
+
+        context 'when the subgroup has "Share lock" disabled (parent overridden)' do
+          context 'as the root_owner' do
+            let(:test_user) { root_owner }
+            let(:expected_help) { parent_locked_and_has_been_overridden }
+
+            it_behaves_like 'share lock option', { disabled: false, checked: false }
+          end
+
+          context 'as the sub_owner' do
+            let(:test_user) { sub_owner }
+            let(:expected_help) { parent_locked_and_has_been_overridden }
+
+            it_behaves_like 'share lock option', { disabled: false, checked: false }
+          end
+        end
+
+        context 'when the subgroup has "Share lock" enabled (same as parent)' do
+          before do
+            subgroup.update_column(:share_with_group_lock, true)
+          end
+
+          context 'as the root_owner' do
+            let(:test_user) { root_owner }
+            let(:expected_help) { parent_locked_but_you_can_override }
+
+            it_behaves_like 'share lock option', { disabled: false, checked: true }
+          end
+
+          context 'as the sub_owner' do
+            let(:test_user) { sub_owner }
+            let(:expected_help) { parent_locked_so_ask_the_owner }
+
+            it_behaves_like 'share lock option', { disabled: true, checked: true }
+          end
+        end
+      end
+    end
+
+    def default_label
+      "Prevent sharing a project within #{test_group.name} with other groups"
+    end
+
+    def default_help
+      "This setting will be applied to all subgroups unless overridden by a group owner."
+    end
+
+    def parent_locked_but_you_can_override
+      "This setting is applied on #{test_group.parent.name}. You can override the setting or remove the share lock from the parent group."
+    end
+
+    def parent_locked_so_ask_the_owner
+      "This setting is applied on #{test_group.parent.name}. To share this group with another group, ask the owner to override the setting or remove the share lock from the parent group."
+    end
+
+    def parent_locked_and_has_been_overridden
+      "This setting is applied on #{test_group.parent.name} and has been overridden on this subgroup."
+    end
+  end
+end