Little wizard to install Tetragon using helm

install_tetragon.sh

#!/bin/bash

usage() {
    echo "Usage:
    $0 {flags}

Flags:
    -c   Helm chart to use (default \"cilium/tetragon\")
    -n   Namespace for Tetragon installation (default \"kube-system\")
    -t   Tag for tetragon.image.tag and tetragonOperator.image.tag (default \"latest\")
    -r   Use release repository: quay.io/cilium/tetragon (default \"quay.io/cilium/tetragon-ci\")
    -h   Display this message"
}

REPOSITORY_TETRAGON=quay.io/cilium/tetragon
REPOSITORY_OPERATOR=quay.io/cilium/tetragon-operator
TAG=$(curl --silent "https://api.github.com/repos/cilium/tetragon/releases/latest" | awk -F'"' '/tag_name/ {print $4}')
HELM_CHART=cilium/tetragon
EXPORT_STDOUT_TAG=v1.0.3

while getopts ":n:t:c:rh" opt; do
    case ${opt} in
        n) 
            NAMESPACE="${OPTARG}"
            ;;
        t) 
            TAG="${OPTARG}"
            ;;
        c) 
            HELM_CHART="${OPTARG}"
            ;;
        r) 
            REPOSITORY_TETRAGON=quay.io/cilium/tetragon
            REPOSITORY_OPERATOR=quay.io/cilium/tetragon-operator
            ;;
        h) 
            usage
            exit 0
            ;;
        \?) 
            echo "error: invalid option: -$OPTARG" 1>&2
            usage 1>&2
            exit 1
            ;;
        :) 
            echo "error: option -$OPTARG requires an argument." 1>&2
            usage 1>&2
            exit 1
            ;;
    esac
done

helm install -n kube-system tetragon $HELM_CHART               \
  --set tetragon.image.tag=$TAG                                \
  --set tetragon.image.repository=$REPOSITORY_TETRAGON         \
  --set tetragonOperator.image.tag=$TAG                        \
  --set tetragonOperator.image.repository=$REPOSITORY_OPERATOR \
  --set export.stdout.image.tag=$EXPORT_STDOUT_TAG

if [ $? -ne 0 ]; then
    echo -e "\nFailed to \"helm install\", trying \"helm upgrade\"\n"
    helm upgrade -n kube-system tetragon $HELM_CHART               \
      --set tetragon.image.tag=$TAG                                \
      --set tetragon.image.repository=$REPOSITORY_TETRAGON         \
      --set tetragonOperator.image.tag=$TAG                        \
      --set tetragonOperator.image.repository=$REPOSITORY_OPERATOR \
      --set export.stdout.image.tag=$EXPORT_STDOUT_TAG
fi