Generator of dockerconfig json for using in the helm.

dockerconfig_generator.sh

#!/bin/bash

REGISTRY_URI="registry.gitlab.com"
USERNAME=""
PASSWORD=""
OUTPUT="raw"

ME_FILENAME="./$(basename "$(test -L "$0" && readlink "$0" || echo "$0")")"
HELP_USAGE="${ME_FILENAME} -u {username} -p {password} [-o raw/json/base64/bs64] registry.example.co"

POSITIONAL=()

while [[ $# -gt 0 ]]; do
  key="$1"

  case $key in
  -u | --username)
    USERNAME="$2"
    shift
    shift
    ;;
  -p | --password)
    PASSWORD="$2"
    shift
    shift
    ;;
  -o | --output)
    OUTPUT="$2"
    if [[ "base64" -ne "$OUTPUT" || "bs64" -ne "$OUTPUT" ||  "json" -ne "$OUTPUT" || "raw" -ne "$OUTPUT" ]]; then
      echo -e "\n[ERROR] Output should be one of the [bs64/base64, raw/json]\n"
      exit
    fi
    shift
    shift
    ;;
  -h | --help)
    echo -e "\nUse ${HELP_USAGE}\n"
    exit 
    ;;
  *)
    POSITIONAL+=("$1")
    shift
    ;;
  esac
done

set -- "${POSITIONAL[@]}"

if [[ -z "${USERNAME}" || -z "${PASSWORD}" ]]; then
  echo -e "\nUse ${HELP_USAGE}\n"
  exit
fi

TEMPLATE='{
    "auths": {
        "{REGISTRY_URI}": {
            "username":"{REGISTRY_USERNAME}",
            "password":"{REGISTRY_PASSWORD}",
            "auth":"{REGISTRY_AUTH}"
    	}
    }
}'

AUTH=$(echo "${USERNAME}:${PASSWORD}" | base64 -w 0)
DOCKERCONFIG=${TEMPLATE/"{REGISTRY_USERNAME}"/"$USERNAME"}
DOCKERCONFIG=${DOCKERCONFIG/"{REGISTRY_PASSWORD}"/"$PASSWORD"}
DOCKERCONFIG=${DOCKERCONFIG/"{REGISTRY_AUTH}"/"$AUTH"}
DOCKERCONFIG=${DOCKERCONFIG/"{REGISTRY_URI}"/"$REGISTRY_URI"}


case $OUTPUT in
base64 | bs64) 
  echo -e $(echo "$DOCKERCONFIG" | base64 -w 0)
  ;;
raw | json)
  echo -e "$DOCKERCONFIG"
  ;;
*) 
  echo "[FATAL] Invalid Output type."
  ;;
esac