Expose can_uninstall in cluster_status.json

Only prometheus can be uninstalled atm, the rest will be dealt with
later.

Presumption is that new application types will have uninstallation
implmemented at the same time.

7 files changed, 49 insertions, 0 deletions

diff --git a/app/models/clusters/applications/cert_manager.rb b/app/models/clusters/applications/cert_manager.rb
index ac0e7eb03bc..d6a7d1d2bdd 100644
--- a/app/models/clusters/applications/cert_manager.rb
+++ b/app/models/clusters/applications/cert_manager.rb
@@ -24,6 +24,12 @@ module Clusters
         'stable/cert-manager'
       end
 
+      # We will implement this in future MRs.
+      # Need to reverse postinstall step
+      def allowed_to_uninstall?
+        false
+      end
+
       def install_command
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: 'certmanager',
diff --git a/app/models/clusters/applications/helm.rb b/app/models/clusters/applications/helm.rb
index 71aff00077d..a83d06c4b00 100644
--- a/app/models/clusters/applications/helm.rb
+++ b/app/models/clusters/applications/helm.rb
@@ -29,6 +29,13 @@ module Clusters
         self.status = 'installable' if cluster&.platform_kubernetes_active?
       end
 
+      # We will implement this in future MRs.
+      # Basically we need to check all other applications are not installed
+      # first.
+      def allowed_to_uninstall?
+        false
+      end
+
       def install_command
         Gitlab::Kubernetes::Helm::InitCommand.new(
           name: name,
diff --git a/app/models/clusters/applications/ingress.rb b/app/models/clusters/applications/ingress.rb
index 376d54aab2c..a1023f44049 100644
--- a/app/models/clusters/applications/ingress.rb
+++ b/app/models/clusters/applications/ingress.rb
@@ -35,6 +35,13 @@ module Clusters
         'stable/nginx-ingress'
       end
 
+      # We will implement this in future MRs.
+      # Basically we need to check all dependent applications are not installed
+      # first.
+      def allowed_to_uninstall?
+        false
+      end
+
       def install_command
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
diff --git a/app/models/clusters/applications/jupyter.rb b/app/models/clusters/applications/jupyter.rb
index f86ff3551a1..987c057ad6d 100644
--- a/app/models/clusters/applications/jupyter.rb
+++ b/app/models/clusters/applications/jupyter.rb
@@ -38,6 +38,12 @@ module Clusters
         content_values.to_yaml
       end
 
+      # Will be addressed in future MRs
+      # We need to investigate and document what will be permenantly deleted.
+      def allowed_to_uninstall?
+        false
+      end
+
       def install_command
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
diff --git a/app/models/clusters/applications/knative.rb b/app/models/clusters/applications/knative.rb
index 38cbc9ce8eb..9fbf5d8af04 100644
--- a/app/models/clusters/applications/knative.rb
+++ b/app/models/clusters/applications/knative.rb
@@ -51,6 +51,12 @@ module Clusters
         { "domain" => hostname }.to_yaml
       end
 
+      # Handled in a new issue:
+      # https://gitlab.com/gitlab-org/gitlab-ce/issues/59369
+      def allowed_to_uninstall?
+        false
+      end
+
       def install_command
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
diff --git a/app/models/clusters/applications/runner.rb b/app/models/clusters/applications/runner.rb
index 3ebf7a5cfba..af648db3708 100644
--- a/app/models/clusters/applications/runner.rb
+++ b/app/models/clusters/applications/runner.rb
@@ -29,6 +29,13 @@ module Clusters
         content_values.to_yaml
       end
 
+      # Need to investigate if pipelines run by this runner will stop upon the
+      # executor pod stopping
+      # I.e.run a pipeline, and uninstall runner while pipeline is running
+      def allowed_to_uninstall?
+        false
+      end
+
       def install_command
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
diff --git a/app/models/clusters/concerns/application_core.rb b/app/models/clusters/concerns/application_core.rb
index ee964fb7c93..4514498b84b 100644
--- a/app/models/clusters/concerns/application_core.rb
+++ b/app/models/clusters/concerns/application_core.rb
@@ -18,6 +18,16 @@ module Clusters
           self.status = 'installable' if cluster&.application_helm_available?
         end
 
+        def can_uninstall?
+          allowed_to_uninstall?
+        end
+
+        # All new applications should uninstall by default
+        # Override if there's dependencies that needs to be uninstalled first
+        def allowed_to_uninstall?
+          true
+        end
+
         def self.application_name
           self.to_s.demodulize.underscore
         end