#!/usr/bin/env bash

# This script will install EKS prerequisites on Amazon Linux or Amazon Linux 2

# * kubectl

# * aws-iam-authenticator

# * AWS CLI

set -e

mkdir -p $HOME/bin

echo 'export PATH=$HOME/bin:$PATH' >>~/.bashrc

# Install kubectl, if absent

if ! type kubectl >/dev/null 2>&1; then

curl -o "kubectl https://amazon-eks.s3-us-west-2.amazonaws.com/1.10.3/2018-07-26/bin/$(uname -s)/amd64/kubectl"

chmod +x ./kubectl

cp ./kubectl $HOME/bin/kubectl && export PATH=$HOME/bin:$PATH

echo 'kubectl installed'

else

echo 'kubectl already installed'

fi

# aws-iam-authenticator

if ! type aws-iam-authenticator >/dev/null 2>&1; then

curl -o aws-iam-authenticator "https://amazon-eks.s3-us-west-2.amazonaws.com/1.10.3/2018-07-26/bin/$(uname -s)/amd64/aws-iam-authenticator"

chmod +x ./aws-iam-authenticator

cp ./aws-iam-authenticator $HOME/bin/aws-iam-authenticator && export PATH=$HOME/bin:$PATH

echo 'aws-iam-authenticator installed'

else

echo 'aws-iam-authenticator already installed'

fi

# AWS CLI

if ! type aws >/dev/null 2>&1; then

curl -o awscli-bundle.zip https://s3.amazonaws.com/aws-cli/awscli-bundle.zip

unzip awscli-bundle.zip

./awscli-bundle/install -b $HOME/bin/aws

echo 'AWS CLI installed'

else

echo 'AWS CLI already installed'

fi

# eksctl

if ! type eksctl >/dev/null 2>&1; then

curl --silent --location "https://github.com/weaveworks/eksctl/releases/download/latest_release/eksctl_$(uname -s)_amd64.tar.gz" | tar xz -C /tmp

mv /tmp/eksctl $HOME/bin

echo 'eksctl installed'

else

echo 'eksctl already installed'

fi

# kubectx/kubens

if ! type kubectx >/dev/null 2>&1; then

git clone https://github.com/ahmetb/kubectx /opt/kubectx

ln -s /opt/kubectx/kubectx /usr/local/bin/kubectx

ln -s /opt/kubectx/kubens /usr/local/bin/kubens

echo 'kubectx installed'

else

echo 'kubectx already installed'

fi

# Test if AWS credentials exist

aws sts get-caller-identity