package_dep.sh

#! /bin/bash

## Useful for checking local chart dependencies before pushing the dependent
## chart local changes.
##
## Usage:
## ./package_dep.sh [MAIN_CHART_PATH] [DEP_CHART_PATH] <[DEP_PACKAGE_VERSION | 0.1.0]>

package_dep() {
  INSTALLED_GO=false
  which go &> /dev/null
  if [ $? == 1 ]; then
    # We need Go's yaml parser. You might want go in general LOL.
    tar -C /usr/local -xzf go$VERSION.$OS-$ARCH.tar.gz
    export PATH=$PATH:/usr/local/go/bin
    INSTALLED_GO=true
  fi

  INSTALLED_YAML=false
  which yaml &> /dev/null
  if [ $? == 1 ]; then
    # You must have go installed and the go bin in your path.
    GO_YAML_PACKAGE=github.com/mikefarah/yaml
    go get $GO_YAML_PACKAGE
    INSTALLED_YAML=true
  fi

  # Define vars.
  MAIN_CHART_PATH="$1"
  MAIN_CHART_NAME=$(helm inspect $MAIN_CHART_PATH | yaml read - name)
  DEP_CHART_PATH="$2"
  DEP_CHART_NAME=$(helm inspect $DEP_CHART_PATH | yaml read - name)
  DEP_PACKAGE_VERSION=${3:-'0.1.0'}
  DEP_TARBALL_PATH="$MAIN_CHART_PATH/charts"
  DEP_TARBALL_NAME="$DEP_CHART_NAME-$DEP_PACKAGE_VERSION.tgz"

  # Cleanup go package if it wasn't already installed.
  if [ $INSTALLED_YAML = 'true' ];then
    go clean -i $GO_YAML_PACKAGE
  fi

  # Cleanup go if it wasn't already installed. Note that we don't need to clean
  # up path as it won't export outside the function.
  if [ $INSTALLED_GO = 'true' ];then
    rm -rf /usr/local/go
  fi

  # Instantiate the chart dep dir if it doesn't aleady exist.
  # Note helm package --destination flag does not handle this for us.
  ls $DEP_TARBALL_PATH &> /dev/null
  if [ $? == 1 ]; then
    mkdir -p $DEP_TARBALL_PATH
  fi

  echo "Repackaging $DEP_CHART_PATH into $DEP_TARBALL_PATH"
  helm package --version "$DEP_PACKAGE_VERSION" --destination "$DEP_TARBALL_PATH" "$DEP_CHART_PATH"

  ls "$DEP_TARBALL_PATH/$DEP_TARBALL_NAME" &> /dev/null
  if [ $? == 0 ]; then
    echo 'Finished.'
  else
    echo 'Something went wrong. Try to package manually.'
    exit 1
  fi
}

package_dep "$@"