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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-3.0-or-later

# -----------------------------------------------------------------------------

# allow running the jobs by hand
[ -z "${NETDATA_BUILD_WITH_DEBUG}" ] && export NETDATA_BUILD_WITH_DEBUG=0
[ -z "${NETDATA_INSTALL_PATH}" ] && export NETDATA_INSTALL_PATH="${1-/opt/netdata}"
[ -z "${NETDATA_MAKESELF_PATH}" ] && NETDATA_MAKESELF_PATH="$(dirname "${0}")/../.."
[ "${NETDATA_MAKESELF_PATH:0:1}" != "/" ] && NETDATA_MAKESELF_PATH="$(pwd)/${NETDATA_MAKESELF_PATH}"
[ -z "${NETDATA_SOURCE_PATH}" ] && export NETDATA_SOURCE_PATH="${NETDATA_MAKESELF_PATH}/../.."
export NETDATA_MAKESELF_PATH NETDATA_MAKESELF_PATH
export NULL=

# make sure the path does not end with /
if [ "${NETDATA_INSTALL_PATH:$((${#NETDATA_INSTALL_PATH} - 1)):1}" = "/" ]; then
  export NETDATA_INSTALL_PATH="${NETDATA_INSTALL_PATH:0:$((${#NETDATA_INSTALL_PATH} - 1))}"
fi

# find the parent directory
NETDATA_INSTALL_PARENT="$(dirname "${NETDATA_INSTALL_PATH}")"
export NETDATA_INSTALL_PARENT

# -----------------------------------------------------------------------------

# bash strict mode
set -euo pipefail

# -----------------------------------------------------------------------------

fetch() {
  local dir="${1}" url="${2}" sha256="${3}" key="${4}"
  local tar="${dir}.tar.gz"
  local cache="${NETDATA_SOURCE_PATH}/artifacts/cache/${BUILDARCH}/${key}"

  if [ -d "${NETDATA_MAKESELF_PATH}/tmp/${dir}" ]; then
    rm -rf "${NETDATA_MAKESELF_PATH}/tmp/${dir}"
  fi

  if [ -d "${cache}/${dir}" ]; then
    echo "Found cached copy of build directory for ${key}, using it."
    cp -a "${cache}/${dir}" "${NETDATA_MAKESELF_PATH}/tmp/"
    CACHE_HIT=1
  else
    echo "No cached copy of build directory for ${key} found, fetching sources instead."

    if [ ! -f "${NETDATA_MAKESELF_PATH}/tmp/${tar}" ]; then
      run wget -O "${NETDATA_MAKESELF_PATH}/tmp/${tar}" "${url}"
    fi

    # Check SHA256 of gzip'd tar file (apparently alpine's sha256sum requires
    # two empty spaces between the checksum and the file's path)
    set +e
    echo "${sha256}  ${NETDATA_MAKESELF_PATH}/tmp/${tar}" | sha256sum -c -s
    local rc=$?
    if [ ${rc} -ne 0 ]; then
        echo >&2 "SHA256 verification of tar file ${tar} failed (rc=${rc})"
        echo >&2 "expected: ${sha256}, got $(sha256sum "${NETDATA_MAKESELF_PATH}/tmp/${tar}")"
        exit 1
    fi
    set -e

    cd "${NETDATA_MAKESELF_PATH}/tmp"
    run tar -zxpf "${tar}"
    cd -

    CACHE_HIT=0
  fi

  run cd "${NETDATA_MAKESELF_PATH}/tmp/${dir}"
}

store_cache() {
    key="${1}"
    src="${2}"

    cache="${NETDATA_SOURCE_PATH}/artifacts/cache/${BUILDARCH}/${key}"

    if [ "${CACHE_HIT:-0}" -eq 0 ]; then
        if [ -d "${cache}" ]; then
            rm -rf "${cache}"
        fi

        mkdir -p "${cache}"

        cp -a "${src}" "${cache}"
    fi
}

# -----------------------------------------------------------------------------

# load the functions of the netdata-installer.sh
# shellcheck source=packaging/installer/functions.sh
. "${NETDATA_SOURCE_PATH}/packaging/installer/functions.sh"

# -----------------------------------------------------------------------------

# debug
echo "ME=${0}"
echo "NETDATA_INSTALL_PARENT=${NETDATA_INSTALL_PARENT}"
echo "NETDATA_INSTALL_PATH=${NETDATA_INSTALL_PATH}"
echo "NETDATA_MAKESELF_PATH=${NETDATA_MAKESELF_PATH}"
echo "NETDATA_SOURCE_PATH=${NETDATA_SOURCE_PATH}"
echo "PROCESSORS=$(nproc)"