Print message if update is unavailable

lib/foreman_maintain/cli/update_command.rb

@@ -19,16 +19,38 @@ def update_runner
         update_runner
       end
 
+      def try_update
+        if update_runner.available?
+          yield
+        else
+          instance = ForemanMaintain.detector.feature(:instance)
+          msg = <<~BANNER
+
+            Update is not available.
+            The system appears to be in the middle of an upgrade.
+            The current version of #{instance.product_name} is #{instance.current_major_version}.
+          BANNER
+
+          puts msg
+          ForemanMaintain::UpgradeRunner::WARNING_EXIT_CODE
+        end
+      end
+
       subcommand 'check', 'Run pre-update checks before updating' do
         interactive_option
         disable_self_update_option
 
         def execute
           ForemanMaintain.validate_downstream_packages
           ForemanMaintain.perform_self_upgrade unless disable_self_update?
-          runner = update_runner
-          runner.run_phase(:pre_update_checks)
-          exit runner.exit_code
+
+          exit_code = try_update do
+            runner = update_runner
+            runner.run_phase(:pre_update_checks)
+            runner.exit_code
+          end
+
+          exit exit_code
         end
       end
 
@@ -39,10 +61,15 @@ def execute
         def execute
           ForemanMaintain.validate_downstream_packages
           ForemanMaintain.perform_self_upgrade unless disable_self_update?
-          runner = update_runner
-          runner.run
-          runner.save
-          exit runner.exit_code
+
+          exit_code = try_update do
+            runner = update_runner
+            runner.run
+            runner.save
+            runner.exit_code
+          end
+
+          exit exit_code
         end
       end
     end

lib/foreman_maintain/update_runner.rb

@@ -18,6 +18,12 @@ def initialize(reporter, options = {})
       self.phase = :pre_update_checks
     end
 
+    def available?
+      condition = { :tags => [:update_scenario, :pre_upgrade_checks] }
+      matching_scenarios = find_scenarios(condition)
+      !matching_scenarios.empty?
+    end
+
     def find_scenario(phase)
       return @scenario_cache[phase] if @scenario_cache.key?(phase)
 

test/lib/cli/update_command_test.rb

@@ -76,6 +76,7 @@ def foreman_maintain_update_unavailable
       it 'runs the update checks when update is not available for foreman-maintain' do
         foreman_maintain_update_unavailable
         UpdateRunner.any_instance.expects(:run_phase).with(:pre_update_checks)
+        UpdateRunner.any_instance.expects(:available?).returns(true)
         assert_cmd <<~OUTPUT
           Checking for new version of rubygem-foreman_maintain...
           Nothing to update, can't find new version of rubygem-foreman_maintain.
@@ -86,8 +87,25 @@ def foreman_maintain_update_unavailable
         foreman_maintain_update_available
         command << '--disable-self-update'
         UpdateRunner.any_instance.expects(:run_phase).with(:pre_update_checks)
+        UpdateRunner.any_instance.expects(:available?).returns(true)
         run_cmd
       end
+
+      it 'throws an error message if no update is available' do
+        foreman_maintain_update_unavailable
+        UpdateRunner.any_instance.expects(:available?).twice.returns(false)
+
+        assert_cmd <<~OUTPUT
+          Checking for new version of rubygem-foreman_maintain...
+          Nothing to update, can't find new version of rubygem-foreman_maintain.
+
+          Update is not available.
+          The system appears to be in the middle of an upgrade.
+          The current version of FakeyFakeFake is 3.14.
+        OUTPUT
+
+        run_cmd([])
+      end
     end
 
     describe 'run' do
@@ -109,6 +127,7 @@ def foreman_maintain_update_unavailable
 
       it 'runs the update when update is not available for foreman-maintain' do
         foreman_maintain_update_unavailable
+        UpdateRunner.any_instance.expects(:available?).returns(true)
         UpdateRunner.any_instance.expects(:run)
         assert_cmd <<~OUTPUT
           Checking for new version of rubygem-foreman_maintain...
@@ -119,9 +138,26 @@ def foreman_maintain_update_unavailable
       it 'skip self update and runs the full update for version' do
         command << '--disable-self-update'
         UpdateRunner.any_instance.expects(:run)
+        UpdateRunner.any_instance.expects(:available?).returns(true)
         run_cmd
       end
 
+      it 'throws an error message if no update is available' do
+        foreman_maintain_update_unavailable
+        UpdateRunner.any_instance.expects(:available?).twice.returns(false)
+
+        assert_cmd <<~OUTPUT
+          Checking for new version of rubygem-foreman_maintain...
+          Nothing to update, can't find new version of rubygem-foreman_maintain.
+
+          Update is not available.
+          The system appears to be in the middle of an upgrade.
+          The current version of FakeyFakeFake is 3.14.
+        OUTPUT
+
+        run_cmd([])
+      end
+
       it 'runs the self update when update available for rubygem-foreman_maintain' do
         foreman_maintain_update_available
         assert_cmd <<~OUTPUT