helm-wrapper.sh

#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

echo "$@"

THISFILE="$(readlink ${BASH_SOURCE[0]} || echo ${BASH_SOURCE[0]})"
REPO_DIR="$( cd "$( dirname "$(dirname "$THISFILE" )" )" && pwd )"
YQ=$(command -v yq-1.15 || command -v yq)

CHART="$1"
NAMESPACE="$2"
VALUES="$3"

NAME="$(basename "$VALUES" ".yaml")"

SERVER_VALUES="$(mktemp)"
function finish {
    rm "$SERVER_VALUES"
}
trap finish exit

SERVER_YAML="$(helm get values "$NAME" --all || echo "{}")"
function get-val {
    echo "$SERVER_YAML" | "$YQ" read - "$1" | sed 's/^null$//g'
}
function pass-val {
    VALUE="$(get-val "$1")"
    if [[ ! -z "$VALUE" ]]; then
        "$YQ" write -i "$SERVER_VALUES" "$1" "$VALUE"
    fi
}

pass-val 's3.uri'
pass-val 'version'

helm upgrade --install \
    --namespace="$NAMESPACE" \
    --values="$REPO_DIR/charts/values.yaml" \
    --values="$SERVER_VALUES" \
    --values="$VALUES" \
    "${@:4}" "$NAME" "$CHART"