#!/bin/bash

if [ -z "${DRONE_TAG}" ]; then
  echo "DRONE_TAG not defined" >&2
  exit 1
fi

set -e -x

REPO="rancher/k3s"

# docker can not contain '+' in the tag, so transform '+' to '-'
DOCKER_TAG=$(echo "${DRONE_TAG}" | sed -e 's/+/-/g')

# export variables for drone-manifest
export PLUGIN_TEMPLATE="${REPO}:${DOCKER_TAG}-ARCH"
export PLUGIN_PLATFORMS="linux/amd64,linux/arm64,linux/arm"

# push current version manifest tag to docker hub
PLUGIN_TARGET="${REPO}:${DOCKER_TAG}" drone-manifest

# do not tag in docker as latest if the github tag contains a '-'
if echo "${DRONE_TAG}" | grep -q '-'; then
  exit 0
fi

# get latest released version from github
GITHUB_URL=https://github.com/k3s-io/k3s/releases
VERSION_K3S=$(curl -w '%{url_effective}' -I -L -s -S ${GITHUB_URL}/latest -o /dev/null | sed -e 's|.*/||')

# function for comparing versions
version_ge() {
  [ "$1" = "$2" ] || [ "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1" ]
}

# do not tag in docker as latest if we are not greater than or equal to the latest github tag
if ! version_ge "${DRONE_TAG}" "${VERSION_K3S}"; then
  exit 0
fi

# push latest manifest tag to docker hub
PLUGIN_TARGET="${REPO}:latest" drone-manifest