Build performance with Helm charts

[aca]

With more than 10+ helm charts it takes almost 60 seconds to build whole applications with cdk8s.
It may not be an issue of cdk8s but it will be great if there's something we can do for it.

Related issues

• Slow performance for Helm chart pulumi/pulumi#6301
• [feature] cache helm YAML rendered result pulumi/pulumi-kubernetes#935

---

Here's a trick I'm using to fix this. With bkt, we can create wrapper for helm cli and use it to build cdk8s applications.

build.sh

export HELM_BINARY=$(which helm)
export PATH=$(pwd)/hacks:$PATH
npm run build

hacks/helm

#!/usr/bin/env bash
set -euo pipefail
[[ -z $TMPDIR ]] && exit 1; [[ -z $HELM_BINARY ]] && exit 1

FILECACHE_DIR="/tmp/_filecache"
filecache() {
    mkdir -p $FILECACHE_DIR >/dev/null 2>&1 || true
    chksum=$(md5sum < "$1" |  awk '{ print $1 }')
    cp -n "$1" "$FILECACHE_DIR/$chksum" >/dev/null 2>&1 
    echo "$FILECACHE_DIR/$chksum"
}

args=("$@")
for ((i=0; i<"${#args[@]}"; ++i)); do
    case ${args[i]} in
        ${TMPDIR}*.yaml) args[i]=$(filecache "${args[i]}")
    esac
done

bkt --ttl 24h -- "$HELM_BINARY" "${args[@]}"

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