Add alpine mirrors while operating on k8s cluster

changelogs/unreleased/helm-add-alpine-mirrors.yml

+---
+title: Increase cluster applications installer availability using alpine linux mirrors
+merge_request:
+author:
+type: performance

lib/gitlab/kubernetes/helm/base_command.rb

@@ -15,6 +15,9 @@ module Gitlab
         def generate_script
           <<~HEREDOC
             set -eo pipefail
+            ALPINE_VERSION=$(cat /etc/alpine-release | cut -d '.' -f 1,2)
+            echo http://mirror.clarkson.edu/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
+            echo http://mirror1.hs-esslingen.de/pub/Mirrors/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
             apk add -U ca-certificates openssl >/dev/null
             wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v#{Gitlab::Kubernetes::Helm::HELM_VERSION}-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
             mv /tmp/linux-amd64/helm /usr/bin/

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

@@ -4,22 +4,10 @@ describe Gitlab::Kubernetes::Helm::BaseCommand do
   let(:application) { create(:clusters_applications_helm) }
   let(:base_command) { described_class.new(application.name) }
 
-  describe '#generate_script' do
-    let(:helm_version) { Gitlab::Kubernetes::Helm::HELM_VERSION }
-    let(:command) do
-      <<~HEREDOC
-         set -eo pipefail
-         apk add -U ca-certificates openssl >/dev/null
-         wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v#{helm_version}-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
-         mv /tmp/linux-amd64/helm /usr/bin/
-      HEREDOC
-    end
-
-    subject { base_command.generate_script }
+  subject { base_command }
 
-    it 'should return a command that prepares the environment for helm-cli' do
-      expect(subject).to eq(command)
-    end
+  it_behaves_like 'helm commands' do
+    let(:commands) { '' }
   end
 
   describe '#pod_resource' do

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

@@ -2,23 +2,9 @@ require 'spec_helper'
 
 describe Gitlab::Kubernetes::Helm::InitCommand do
   let(:application) { create(:clusters_applications_helm) }
-  let(:init_command) { described_class.new(application.name) }
+  let(:commands) { 'helm init >/dev/null' }
 
-  describe '#generate_script' do
-    let(:command) do
-      <<~MSG.chomp
-        set -eo pipefail
-        apk add -U ca-certificates openssl >/dev/null
-        wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v2.7.0-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
-        mv /tmp/linux-amd64/helm /usr/bin/
-        helm init >/dev/null
-      MSG
-    end
+  subject { described_class.new(application.name) }
 
-    subject { init_command.generate_script }
-
-    it 'should return the appropriate command' do
-      is_expected.to eq(command)
-    end
-  end
+  it_behaves_like 'helm commands'
 end

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

@@ -12,22 +12,15 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
     )
   end
 
-  describe '#generate_script' do
-    let(:command) do
-      <<~MSG
-      set -eo pipefail
-      apk add -U ca-certificates openssl >/dev/null
-      wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v2.7.0-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
-      mv /tmp/linux-amd64/helm /usr/bin/
+  subject { install_command }
+
+  it_behaves_like 'helm commands' do
+    let(:commands) do
+      <<~EOS
          helm init --client-only >/dev/null
          helm install #{application.chart} --name #{application.name} --namespace #{namespace} -f /data/helm/#{application.name}/config/values.yaml >/dev/null
-      MSG
+      EOS
     end
-
-    subject { install_command.generate_script }
-
-    it 'should return appropriate command' do
-      is_expected.to eq(command)
   end
 
   context 'with an application with a repository' do
@@ -42,20 +35,13 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
       )
     end
 
-      let(:command) do
-        <<~MSG
-        set -eo pipefail
-        apk add -U ca-certificates openssl >/dev/null
-        wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v2.7.0-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
-        mv /tmp/linux-amd64/helm /usr/bin/
+    it_behaves_like 'helm commands' do
+      let(:commands) do
+        <<~EOS
            helm init --client-only >/dev/null
            helm repo add #{application.name} #{application.repository}
            helm install #{application.chart} --name #{application.name} --namespace #{namespace} -f /data/helm/#{application.name}/config/values.yaml >/dev/null
-        MSG
-      end
-
-      it 'should return appropriate command' do
-        is_expected.to eq(command)
+        EOS
       end
     end
   end

spec/support/shared_examples/helm_generated_script.rb

+shared_examples 'helm commands' do
+  describe '#generate_script' do
+    let(:helm_setup) do
+      <<~EOS
+         set -eo pipefail
+         ALPINE_VERSION=$(cat /etc/alpine-release | cut -d '.' -f 1,2)
+         echo http://mirror.clarkson.edu/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
+         echo http://mirror1.hs-esslingen.de/pub/Mirrors/alpine/v$ALPINE_VERSION/main >> /etc/apk/repositories
+         apk add -U ca-certificates openssl >/dev/null
+         wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v2.7.0-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
+         mv /tmp/linux-amd64/helm /usr/bin/
+      EOS
+    end
+
+    it 'should return appropriate command' do
+      expect(subject.generate_script).to eq(helm_setup + commands)
+    end
+  end
+end