kdep-merge-inherited-values

#!/bin/bash
# This script is used internally to combines the various values yaml files into one
# Input to this script is one argument: the path to the top-most values file, the most specific one
# the script breaks up the filename by dashes and fills in values from less specific files if they exist
# no files, even the original argument have to exist
set -euo pipefail

pathToValues=$1
cd $(dirname "$pathToValues")
topMostValuesFile=$(basename "$pathToValues")

if [ ! -f "Chart.yaml" ]; then
	echo "Error: The directory provided does not seem to be a chart directory."
	exit 1
fi

root=$(echo "$topMostValuesFile"|rev|cut -d- -f1|rev)
environment=$(echo "$topMostValuesFile"|rev|cut -d- -f2|rev)
region=$(echo "$topMostValuesFile"|rev|cut -d- -f3|rev)
custom=$(echo "$topMostValuesFile"|rev|cut -d- -f4-|rev)

values="{}"
if [ -f "$root" ]; then
	echo >&2 "Parsed $root"
	values=$(echo "$values" "$(yq r -j $root)" | jq -s '.[0] * .[1]' - -)
fi
if [ -f "$environment-$root" ]; then
	echo >&2 "Parsed $environment-$root"
	values=$(echo "$values" "$(yq r -j $environment-$root)" | jq -s '.[0] * .[1]' - -)
fi
if [ -f "$region-$environment-$root" ]; then
	echo >&2 "Parsed $region-$environment-$root"
	values=$(echo "$values" "$(yq r -j $region-$environment-$root)" | jq -s '.[0] * .[1]' - -)
fi
if [ -f "$custom-$region-$environment-$root" ]; then
	echo >&2 "Parsed $custom-$region-$environment-$root"
	values=$(echo "$values" "$(yq r -j $custom-$region-$environment-$root)" | jq -s '.[0] * .[1]' - -)
fi

echo "$values"