Implement Tillerless install and uninstall

This removes need to require Helm Tiller to be installed first.

Stop calling TLS flags if using local tiller.

This is all behind a feature flag as FE support is still forthcoming

lib/gitlab/kubernetes/helm/client_command.rb

@@ -5,14 +5,24 @@ module Gitlab
     module Helm
       module ClientCommand
         def init_command
+          if local_tiller_enabled?
+            <<~HEREDOC.chomp
+            export HELM_HOST="localhost:44134"
+            tiller -listen ${HELM_HOST} -alsologtostderr &
+            helm init --client-only
+            HEREDOC
+          else
             # Here we are always upgrading to the latest version of Tiller when
             # installing an app. We ensure the helm version stored in the
             # database is correct by also updating this after transition to
             # :installed,:updated in Clusters::Concerns::ApplicationStatus
             'helm init --upgrade'
           end
+        end
 
         def wait_for_tiller_command
+          return if local_tiller_enabled?
+
           helm_check = ['helm', 'version', *optional_tls_flags].shelljoin
           # This is necessary to give Tiller time to restart after upgrade.
           # Ideally we'd be able to use --wait but cannot because of
@@ -25,6 +35,14 @@ module Gitlab
           ['helm', 'repo', 'add', name, repository].shelljoin if repository
         end
 
+        private
+
+        def tls_flags_if_remote_tiller
+          return [] if local_tiller_enabled?
+
+          optional_tls_flags
+        end
+
         def optional_tls_flags
           return [] unless files.key?(:'ca.pem')
 
@@ -35,6 +53,10 @@ module Gitlab
             '--tls-key', "#{files_dir}/key.pem"
           ]
         end
+
+        def local_tiller_enabled?
+          Feature.enabled?(:managed_apps_local_tiller)
+        end
       end
     end
   end

lib/gitlab/kubernetes/helm/delete_command.rb

@@ -39,7 +39,7 @@ module Gitlab
         private
 
         def delete_command
-          command = ['helm', 'delete', '--purge', name] + optional_tls_flags
+          command = ['helm', 'delete', '--purge', name] + tls_flags_if_remote_tiller
 
           command.shelljoin
         end

lib/gitlab/kubernetes/helm/install_command.rb

@@ -49,7 +49,7 @@ module Gitlab
           command = ['helm', 'upgrade', name, chart] +
             install_flag +
             reset_values_flag +
-            optional_tls_flags +
+            tls_flags_if_remote_tiller +
             optional_version_flag +
             rbac_create_flag +
             namespace_flag +

spec/lib/gitlab/kubernetes/helm/delete_command_spec.rb

@@ -10,6 +10,22 @@ describe Gitlab::Kubernetes::Helm::DeleteCommand do
 
   subject { delete_command }
 
+  it_behaves_like 'helm commands' do
+    let(:commands) do
+      <<~EOS
+      export HELM_HOST="localhost:44134"
+      tiller -listen ${HELM_HOST} -alsologtostderr &
+      helm init --client-only
+      helm delete --purge app-name
+      EOS
+    end
+  end
+
+  context 'tillerless feature disabled' do
+    before do
+      stub_feature_flags(managed_apps_local_tiller: false)
+    end
+
     it_behaves_like 'helm commands' do
       let(:commands) do
         <<~EOS
@@ -20,6 +36,9 @@ describe Gitlab::Kubernetes::Helm::DeleteCommand do
       end
     end
 
+    context 'when there is a ca.pem file' do
+      let(:files) { { 'ca.pem': 'some file content' } }
+
       let(:tls_flags) do
         <<~EOS.squish
         --tls
@@ -29,9 +48,6 @@ describe Gitlab::Kubernetes::Helm::DeleteCommand do
         EOS
       end
 
-  context 'when there is a ca.pem file' do
-    let(:files) { { 'ca.pem': 'some file content' } }
-
       it_behaves_like 'helm commands' do
         let(:commands) do
           <<~EOS
@@ -49,6 +65,7 @@ describe Gitlab::Kubernetes::Helm::DeleteCommand do
         end
       end
     end
+  end
 
   describe '#pod_resource' do
     subject { delete_command.pod_resource }

spec/lib/gitlab/kubernetes/helm/install_command_spec.rb

@@ -23,6 +23,38 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     )
   end
 
+  subject { install_command }
+
+  it_behaves_like 'helm commands' do
+    let(:commands) do
+      <<~EOS
+      export HELM_HOST="localhost:44134"
+      tiller -listen ${HELM_HOST} -alsologtostderr &
+      helm init --client-only
+      helm repo add app-name https://repository.example.com
+      helm repo update
+      #{helm_install_comand}
+      EOS
+    end
+
+    let(:helm_install_comand) do
+      <<~EOS.squish
+      helm upgrade app-name chart-name
+        --install
+        --reset-values
+        --version 1.2.3
+        --set rbac.create\\=false,rbac.enabled\\=false
+        --namespace gitlab-managed-apps
+        -f /data/helm/app-name/config/values.yaml
+      EOS
+    end
+  end
+
+  context 'tillerless feature disabled' do
+    before do
+      stub_feature_flags(managed_apps_local_tiller: false)
+    end
+
     let(:tls_flags) do
       <<~EOS.squish
       --tls
@@ -32,8 +64,6 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
       EOS
     end
 
-  subject { install_command }
-
     it_behaves_like 'helm commands' do
       let(:commands) do
         <<~EOS
@@ -58,6 +88,7 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         EOS
       end
     end
+  end
 
   context 'when rbac is true' do
     let(:rbac) { true }
@@ -65,8 +96,9 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     it_behaves_like 'helm commands' do
       let(:commands) do
         <<~EOS
-        helm init --upgrade
-        for i in $(seq 1 30); do helm version #{tls_flags} && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)
+        export HELM_HOST="localhost:44134"
+        tiller -listen ${HELM_HOST} -alsologtostderr &
+        helm init --client-only
         helm repo add app-name https://repository.example.com
         helm repo update
         #{helm_install_command}
@@ -78,7 +110,6 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         helm upgrade app-name chart-name
           --install
           --reset-values
-          #{tls_flags}
           --version 1.2.3
           --set rbac.create\\=true,rbac.enabled\\=true
           --namespace gitlab-managed-apps
@@ -94,8 +125,9 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     it_behaves_like 'helm commands' do
       let(:commands) do
         <<~EOS
-        helm init --upgrade
-        for i in $(seq 1 30); do helm version #{tls_flags} && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)
+        export HELM_HOST="localhost:44134"
+        tiller -listen ${HELM_HOST} -alsologtostderr &
+        helm init --client-only
         helm repo add app-name https://repository.example.com
         helm repo update
         /bin/date
@@ -109,7 +141,6 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         helm upgrade app-name chart-name
           --install
           --reset-values
-          #{tls_flags}
           --version 1.2.3
           --set rbac.create\\=false,rbac.enabled\\=false
           --namespace gitlab-managed-apps
@@ -125,8 +156,9 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     it_behaves_like 'helm commands' do
       let(:commands) do
         <<~EOS
-        helm init --upgrade
-        for i in $(seq 1 30); do helm version #{tls_flags} && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)
+        export HELM_HOST="localhost:44134"
+        tiller -listen ${HELM_HOST} -alsologtostderr &
+        helm init --client-only
         helm repo add app-name https://repository.example.com
         helm repo update
         #{helm_install_command}
@@ -140,7 +172,6 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         helm upgrade app-name chart-name
           --install
           --reset-values
-          #{tls_flags}
           --version 1.2.3
           --set rbac.create\\=false,rbac.enabled\\=false
           --namespace gitlab-managed-apps
@@ -156,8 +187,9 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     it_behaves_like 'helm commands' do
       let(:commands) do
         <<~EOS
-        helm init --upgrade
-        for i in $(seq 1 30); do helm version && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)
+        export HELM_HOST="localhost:44134"
+        tiller -listen ${HELM_HOST} -alsologtostderr &
+        helm init --client-only
         helm repo add app-name https://repository.example.com
         helm repo update
         #{helm_install_command}
@@ -184,8 +216,9 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     it_behaves_like 'helm commands' do
       let(:commands) do
         <<~EOS
-        helm init --upgrade
-        for i in $(seq 1 30); do helm version #{tls_flags} && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)
+        export HELM_HOST="localhost:44134"
+        tiller -listen ${HELM_HOST} -alsologtostderr &
+        helm init --client-only
         helm repo add app-name https://repository.example.com
         helm repo update
         #{helm_install_command}
@@ -197,7 +230,6 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         helm upgrade app-name chart-name
           --install
           --reset-values
-          #{tls_flags}
           --set rbac.create\\=false,rbac.enabled\\=false
           --namespace gitlab-managed-apps
           -f /data/helm/app-name/config/values.yaml