dump a deployed helm release into individual manifest files

helmdump.sh

#!/usr/bin/env bash

set -euo pipefail

# ./helmdump.sh [target-chart] [output-dir] [namespace]
# $1: the target char
# $2: the output directory, must be a relative path
# $3: optional namespace, if not provided the current namespace is used

targetChart="$1"
outputDir="$PWD/${2%/}"
namespace="${3:-"$(kubectl config view --minify -o jsonpath='{..namespace}')"}"

mkdir -p "$outputDir"

ws="$(mktemp -d)"
trap "rm -rf $ws" EXIT ERR

cd "$ws"

helm status "$targetChart" -o json -n "$namespace" | jq -r '.manifest' >manifests.yaml
kustomize init
kustomize edit add resource manifests.yaml
kustomize edit set namespace "$namespace"
kustomize build . --output "$outputDir/"

cd -