create-stack

#!/usr/bin/env bash

set -e

script_dir=$(cd "$(dirname "$0")" ; pwd -P)

source ${script_dir}/fetch-github-registration-token.sh

repo_name=$(fetch-repo-name)

create-update() {
  pushd "${script_dir}" > /dev/null
    project_name="${1}"
    module_name="${2}"
    aws_region="${3}"
    github_username="${4}"

    for i in project_name module_name aws_region github_username; do
      if [ -z "!{i}" ]; then
        echo "${i} not set. Usage <func: create-update> PROJECT_NAME MODULE_NAME AWS_REGION GITHUB_USERNAME"
        exit 1
      fi
    done


    response=$(fetch-github-registration-token ${github_username} ${repo_name})
     token=$(echo $response | jq -r .token)
     if [ "${token}" == null ]; then
       echo "Token is NULL. Are you sure you entered your Personal Access Token correctly?"
       echo $response
       exit 1
     fi
    create-update-ssm-parameter "${project_name}" "${module_name}" "${aws_region}" "${token}"
    create-update-stack "${project_name}" "${module_name}" "${aws_region}"
  popd > /dev/null
}

create-update-ssm-parameter() {
    project_name="${1}"
    module_name="${2}"
    aws_region="${3}"
    token="${4}"
    for i in project_name module_name token; do
      if [ -z "!{i}" ]; then
        echo "${i} not set. Usage <func: create-update-ssm-parameter> PROJECT_NAME MODULE_NAME AWS_REGION TOKEN"
        exit 1
      fi
    done

    parameter="/${project_name}/${module_name}/github-runner-reg-token"
    if [[ ! $(aws ssm get-parameter --name "${parameter}" --region ${aws_region}) ]]; then
      echo "Parameter (${parameter}) does not exist. Creating..."
      aws ssm put-parameter \
        --name "${parameter}" \
        --value "${token}" \
        --type SecureString \
        --region "${aws_region}"
    else
      echo "Parameter (${parameter}) exists. Updating..."
      aws ssm put-parameter \
        --name "${parameter}" \
        --value "${token}" \
        --overwrite \
        --region "${aws_region}"
    fi
}

create-update-stack() {
  project_name="${1}"
  module_name="${2}"
  aws_region="${3}"

  pushd "${script_dir}" > /dev/null
    stack_name="${project_name}-${module_name}-github-runner-stack"
    if [[ ! $(aws cloudformation describe-stacks --stack-name "${stack_name}" --region "${aws_region}") ]]; then
      echo "Stack (${stack_name}) does not exist. Creating..."
      aws cloudformation create-stack --stack-name "${stack_name}" \
        --template-body file://./template.yaml \
        --capabilities CAPABILITY_NAMED_IAM \
        --region "${aws_region}" \
        --parameters ParameterKey=ProjectName,ParameterValue=${project_name} ParameterKey=ModuleName,ParameterValue=${module_name} ParameterKey=InstanceType,ParameterValue=t3.medium ParameterKey=GithubRepoUrl,ParameterValue=https://github.com/${repo_name}
    else
      echo "Stack (${stack_name}) exists. Creating ChangeSet..."
      now=$(date +%s)
      aws cloudformation create-change-set \
        --stack-name "${stack_name}" \
        --change-set-name "update-${now}" \
        --template-body file://./template.yaml \
        --capabilities CAPABILITY_NAMED_IAM \
        --region "${aws_region}" \
        --parameters ParameterKey=ProjectName,ParameterValue=${project_name} ParameterKey=ModuleName,ParameterValue=${module_name} ParameterKey=InstanceType,ParameterValue=t3.medium ParameterKey=GithubRepoUrl,ParameterValue=https://github.com/${repo_name}

      echo "Waiting 20 seconds for the ChangeSet to create..."
      sleep 20
      echo "Executing ChangeSet..."
      aws cloudformation execute-change-set \
        --change-set-name "update-${now}" \
        --stack-name "${stack_name}" \
        --region "${aws_region}"
      echo "ChangeSet execution complete."
    fi
  popd > /dev/null

}

usage() { echo "Usage: $0 [-p <project name: string>] [-m <module name: string>] [-r <aws region: string>] [-u <github username: string>]" 1>&2; exit 1; }

while getopts ":p:m:r:u:" o; do
    case "${o}" in
        p)
            project=${OPTARG}
            ;;
        m)
            module=${OPTARG}
            ;;
        r)
            region=${OPTARG}
            ;;
        u)
            githubuser=${OPTARG}
            ;;
        *)
            usage
            ;;
    esac
done
shift $((OPTIND-1))

if [ -z "${project}" ] || [ -z "${module}" ] || [ -z "${region}" ] || [ -z "${githubuser}" ]; then
    usage
fi

create-update ${project} ${module} ${region} ${githubuser}
echo "View your Cloudformation Stack at https://${region}.console.aws.amazon.com/cloudformation/home?region=${region}#/stacks"