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
-          # 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'
+          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

@@ -13,40 +13,57 @@ describe Gitlab::Kubernetes::Helm::DeleteCommand 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 delete --purge app-name
       EOS
     end
   end
 
-  let(:tls_flags) do
-    <<~EOS.squish
-    --tls
-    --tls-ca-cert /data/helm/app-name/config/ca.pem
-    --tls-cert /data/helm/app-name/config/cert.pem
-    --tls-key /data/helm/app-name/config/key.pem
-    EOS
-  end
-
-  context 'when there is a ca.pem file' do
-    let(:files) { { 'ca.pem': 'some file content' } }
+  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
         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)
-        #{helm_delete_command}
+        for i in $(seq 1 30); do helm version && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)
+        helm delete --purge app-name
         EOS
       end
+    end
 
-      let(:helm_delete_command) do
+    context 'when there is a ca.pem file' do
+      let(:files) { { 'ca.pem': 'some file content' } }
+
+      let(:tls_flags) do
         <<~EOS.squish
-        helm delete --purge app-name
-        #{tls_flags}
+        --tls
+        --tls-ca-cert /data/helm/app-name/config/ca.pem
+        --tls-cert /data/helm/app-name/config/cert.pem
+        --tls-key /data/helm/app-name/config/key.pem
         EOS
       end
+
+      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)
+          #{helm_delete_command}
+          EOS
+        end
+
+        let(:helm_delete_command) do
+          <<~EOS.squish
+          helm delete --purge app-name
+          #{tls_flags}
+          EOS
+        end
+      end
     end
   end
 

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

@@ -23,22 +23,14 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     )
   end
 
-  let(:tls_flags) do
-    <<~EOS.squish
-    --tls
-    --tls-ca-cert /data/helm/app-name/config/ca.pem
-    --tls-cert /data/helm/app-name/config/cert.pem
-    --tls-key /data/helm/app-name/config/key.pem
-    EOS
-  end
-
   subject { install_command }
 
   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_comand}
@@ -50,7 +42,6 @@ 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
@@ -59,8 +50,19 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     end
   end
 
-  context 'when rbac is true' do
-    let(:rbac) { true }
+  context 'tillerless feature disabled' do
+    before do
+      stub_feature_flags(managed_apps_local_tiller: false)
+    end
+
+    let(:tls_flags) do
+      <<~EOS.squish
+      --tls
+      --tls-ca-cert /data/helm/app-name/config/ca.pem
+      --tls-cert /data/helm/app-name/config/cert.pem
+      --tls-key /data/helm/app-name/config/key.pem
+      EOS
+    end
 
     it_behaves_like 'helm commands' do
       let(:commands) do
@@ -69,6 +71,36 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         for i in $(seq 1 30); do helm version #{tls_flags} && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)
         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
+        #{tls_flags}
+        --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
+  end
+
+  context 'when rbac is true' do
+    let(:rbac) { true }
+
+    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_command}
         EOS
       end
@@ -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