Package a Helm chart

package-chart.sh

# Locally package a Helm chart by using a custom values file.

usage() {
  echo -e "USAGE\n  $(basename $0) chart-dir [values-file] [templates-dir]"
}
[[ ! ( "$#" -eq 1 || "$#" -eq 2 || "$#" -eq 3 ) ]] && { usage; exit 1; }

chart=${1%/}
values=$2
templates=$3

if [[ ! -d "$chart" ]]; then
  echo -e "Directory '$chart' does not exist.\n\nIf it's in a submodule, you might need to run the following first:\n\n    git submodule update --init"
  exit 1
elif [[ -n "$values" && ! -f "$values" ]]; then
  echo "File '$values' does not exist."
  exit 1
elif [[ -n "$templates" && ! -d "$templates" ]]; then
  echo "Directory '$templates' does not exist."
  exit 1
fi


tmp=$(mktemp -d)
cp -r "$chart/" "$tmp"
[[ -n "$values" ]] && cp "$values" "$tmp"/values.yaml
[[ -n "$templates" ]] && cp -r "$templates" "$tmp"/templates
file=$(helm package "$tmp" --dependency-update | awk '{print $NF}')
tar xzf "$file" && rm "$file"