Setup kubectl once

.travis.yml

@@ -48,12 +48,7 @@ after_failure:
   - ./send.sh failure $WEBHOOK_URL
 
 before_deploy:
-  - openssl aes-256-cbc -K $encrypted_44f54ef0bc46_key -iv $encrypted_44f54ef0bc46_iv -in kubeconfig.yaml.enc -out kubeconfig.yaml -d
+  - ./scripts/setup_kubernetes.sh
-  - curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
-  - chmod +x ./kubectl
-  - sudo mv ./kubectl /usr/local/bin/kubectl
-  - mkdir -p ${HOME}/.kube
-  - cp kubeconfig.yaml ${HOME}/.kube/config
 
 deploy:
   - provider: script

scripts/setup_kubernetes.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+# This script can be called multiple times for each `before_deploy` hook
+# so let's exit successfully if kubectl is already installed:
+command -v kubectl && exit 0
+
+
+openssl aes-256-cbc -K $encrypted_44f54ef0bc46_key -iv $encrypted_44f54ef0bc46_iv -in kubeconfig.yaml.enc -out kubeconfig.yaml -d
+mkdir ${HOME}/.kube
+cp kubeconfig.yaml ${HOME}/.kube/config
+
+curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
+chmod +x ./kubectl
+sudo mv ./kubectl /usr/local/bin/kubectl
+