k

#!/usr/bin/env bash

# Kubernetes/Kyma utilities - k

set -o errexit

declare namespace dockerserver user repository
self=$(basename "$0")
namespace=default
dockerserver=https://docker.pkg.github.com
secretname=regcred

# Helper functions -----------------------------------------------------

usage() {
  cat <<EOF
Usage: $self <options> <action>

with options:
-u | --user <GitHub user>
-r | --repository <GitHub repository>

with actions:
- deploy: make deployment (needs -u and -r)
- configmap: create and deploy config map
- secret: create secret for GitHub Package registry access
EOF
}

checkval() {
  while (( $# )); do
    if [[ -z "$1" ]]; then
      usage
      exit 1
    fi
    shift
  done
}

# Action functions -----------------------------------------------------

deploy() {
  checkval "$user" "$repository"
  echo Deploying to k8s
  sed -e "s/OWNER/$user/; s/REPOSITORY/$repository/" deployment.yaml \
    | kubectl apply -n $namespace -f -
}

configmap() {
  local json
  if [ ! -f default-env.json ]; then
    echo No default-env.json file
    exit 1
  fi
  echo Creating and deploying config map to k8s
  json=$(jq -r .VCAP_SERVICES default-env.json | tr '\n' ' ')
  cat <<EOF | kubectl apply -f -
kind: ConfigMap
apiVersion: v1
metadata:
  name: appconfigcap
data:
  VCAP_SERVICES: |
    $json
EOF
}

secret() {
  local email user pass
  echo Setting up docker-registry secret $secretname for access to $dockerserver
  if kubectl get secret $secretname >/dev/null 2>&1; then
    read -rp "Secret $secretname exists - will remove first (hit enter to continue)"
    kubectl delete secret $secretname
  fi
  read -r -p "Enter email: " email
  read -r -p "Enter username: " user
  read -r -s -p "Enter password / token: " pass
  echo
  kubectl create secret docker-registry $secretname \
    --docker-server=$dockerserver \
    --docker-email="$email" \
    --docker-username="$user" \
    --docker-password="$pass"
}

# Main function --------------------------------------------------------

main() {
  local action
  local arg
  if [[ $# -eq 0 ]]; then
    usage
    exit 1
  fi
  while (( $# )); do
    arg=$1
    case $arg in
      -u|--user)
        shift
        user=$1
        ;;
      -r|--repository)
        shift
        repository=$1
        ;;
      deploy|secret|configmap)
        action=$arg
        shift $(( $# - 1 ))
        ;;
      *)
        usage
        exit 1
        ;;
    esac
    shift
  done

  if [[ -z "$action" ]]; then
    usage
    exit 1
  fi

  $action

}

# Execution start ------------------------------------------------------

main "$@"