convert helm repo to oci repo

convert-helm-to-oci.sh

#!/bin/bash
#
# convert helm repo to oci registry
#

set -e

HELM_REPO="prometheus-community"
HELM_REPO_URL="https://prometheus-community.github.io/helm-charts"
HELM_REPO_OCI_URL="oci://ghcr.io/prometheus-community/charts"
CHART_DIR="charts"

mkdir -p $CHART_DIR
helm repo add $HELM_REPO $HELM_REPO_URL

# pull

for CHART in $(helm search repo $HELM_REPO --max-col-width 1000 | awk '{print $1}' | grep -v 'NAME'); do 
    for VERSION in $(helm search repo $CHART -l | awk '{print $2}' | grep -v 'CHART' ); do
        echo "$CHART $VERSION"
        helm pull $CHART --version $VERSION -d $CHART_DIR
    done
done

# push

for CHART in $(ls $CHART_DIR | sort -V); do
    echo "$CHART"
    helm push "$CHART_DIR/$CHART" "$HELM_REPO_OCI_URL"
done