Get all images in helm chart and copy to internal registry

copy-helm-images.sh

#!/bin/bash

set -e

function usage(){
    echo "$(basename $0) --registry registry.gitlab.com/images --platform linux/amd64 --chart fluent/fluent-bit --version 0.19.10" >&2
}

function teardown {
  rm -rf "./tmp"
}

function copy() {
    local registry=$1
    local platform=$2
    local chart=$3
    local version=$4

    command -v helm     >/dev/null 2>&1 || { echo >&2 "I require 'helm' but it's not installed! Aborting.";     exit 1; }
    command -v crane    >/dev/null 2>&1 || { echo >&2 "I require 'crane' but it's not installed! Aborting.";    exit 1; }

    helm pull "$3" --version "$4" --untar --untardir tmp
    pushd tmp
    pushd */
    
    # https://github.com/helm-lab/helm-images/blob/master/images.sh
    images=$(helm install --generate-name --dry-run "." | grep "image:" | awk -F" " '{print $2}' | sed 's/^"//g' | sed 's/\"//g' | sort | awk '!seen[$0]++')

    # traverse all the images
    # image format: foo/bar:baz
    for src in $images; do
        dst="$registry/$src"
        echo "[+] Copying image from SRC: $src to DST: $dst"

        # what if image tag already in the registry?
        # TODO: prompt [y/N] to override if digest matched
        crane copy --platform $platform $src $dst
    done

    popd
    popd
}

# https://stackoverflow.com/a/14203146/5685796
POSITIONAL=()
while [[ $# -gt 0 ]]; do
  key="$1"

  case $key in
    -r|--registry)
      REGISTRY="$2"
      shift
      shift
      ;;
    -p|--platform)
      PLATFORM="$2"
      shift
      shift
      ;;
    -c|--chart)
      CHART="$2"
      shift
      shift
      ;;
    -v|--version)
      VERSION="$2"
      shift
      shift
      ;;
    *)
      POSITIONAL+=("$1")
      shift
      ;;
  esac
done

set -- "${POSITIONAL[@]}"

trap teardown EXIT

copy $REGISTRY $PLATFORM $CHART $VERSION