#!/bin/sh
set -eu

if [ "$#" -ne 2 ]; then
  echo "usage: $0 APPLICATION CHART_VERSION" >&2
  exit 2
fi

application=$1
version=$2
case "$application" in
  ''|*[!a-z0-9-]*) echo "invalid application name: $application" >&2; exit 2 ;;
esac
case "$version" in
  ''|*[!0-9A-Za-z.+-]*) echo "invalid chart version: $version" >&2; exit 2 ;;
esac

file="bootstrap/${application}.yaml"
test -f "$file"
tmp=$(mktemp)
trap 'rm -f "$tmp"' EXIT

awk -v version="$version" '
  $1 == "chart:" && !chart { chart=1 }
  chart && $1 == "targetRevision:" && !updated {
    sub(/targetRevision:.*/, "targetRevision: " version)
    updated=1
  }
  { print }
  END { if (!updated) exit 3 }
' "$file" > "$tmp"
mv "$tmp" "$file"
trap - EXIT