Release Helm charts

release-helm.sh

#!/usr/bin/env bash

#
# Script to release Helm charts.
#
# Requires: helm, gsutil, yq.
#
# Usage: release.sh CHART_DIR
#

set -euo pipefail

HELM_REPO=${HELM_REPO:-https://helm-dev.wxyz.co/helm}
GCS_BUCKET=${GCS_BUCKET:-wxyz-helm-charts-dev/helm}
DRY_RUN=${DRY_RUN:-true}

gsutil="echo gsutil"
if [[ "$DRY_RUN" != "true" ]]; then
    gsutil="gsutil"
fi

main() {
    dir=${1:-./deploy}

    cd $dir

    # clean up potential old archives
    find . -name *.tgz | xargs -n1 rm -f

    for chartYaml in $(find . -name Chart.yaml | sort); do
    
        chartDir=$(dirname $chartYaml)
        chartName=$(yq .name $chartYaml)
        chartVersion=$(yq .version $chartYaml)

        echo "~ Release chart $chartDir"
        
        # copy package deps like 'helm dependency update chart'
        for depName in $(yq '.dependencies[] | select(has("repository")) | .name' $chartYaml); do
            cp -f $(find . -name "$depName-*.tgz") $chartDir/charts/
        done
        
        helm package $chartDir --destination $chartDir

        # only allow to overwrite SNAPSHOT
        dstBucket=gs://$GCS_BUCKET/$(basename $chartDir)/$chartName-$chartVersion.tgz
        if [[ $(set +e; gsutil -q stat $dstBucket; set -e) ]]; then
            if [[ ! "$chartVersion" =~ SNAPSHOT ]]; then
                echo "Cannot overwrite $dstBucket"
                exit 1
            fi
        fi

        $gsutil cp $chartDir/*.tgz gs://$GCS_BUCKET/$chartName/
    
    done

    echo "~ Update $HELM_REPO index"

    $gsutil cp gs://$GCS_BUCKET/index.yaml index.yaml.old
    helm repo index . --merge index.yaml.old --url $HELM_REPO
    $gsutil cp index.yaml gs://$GCS_BUCKET/index.yaml
}

main "$@"