自定义shell工具函数之pull

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这是一个名为pull_image的Shell脚本函数。让我来解释一下这个函数的功能：

function pull_image() {
  image=$1
  DOCKER_IMAGE_MIRROR=$(get_config_or_env 'DOCKER_IMAGE_MIRROR')
  if [[ "${DOCKER_IMAGE_MIRROR}" == "1" ]]; then
    if [[ "$(uname -m)" == "x86_64" ]]; then
      DOCKER_IMAGE_PREFIX="swr.cn-north-1.myhuaweicloud.com"
    fi
    if [[ "$(uname -m)" == "aarch64" ]]; then
      DOCKER_IMAGE_PREFIX="swr.cn-north-4.myhuaweicloud.com"
    fi
    if [[ "$(uname -m)" == "loongarch64" ]]; then
      DOCKER_IMAGE_PREFIX="swr.cn-southwest-2.myhuaweicloud.com"
    fi
  else
    DOCKER_IMAGE_PREFIX=$(get_config_or_env 'DOCKER_IMAGE_PREFIX')
  fi

  IMAGE_PULL_POLICY=$(get_config_or_env 'IMAGE_PULL_POLICY')

  if docker image inspect -f '{{ .Id }}' "$image" &> /dev/null; then
    exits=0
  else
    exits=1
  fi

  if [[ "$exits" == "0" && "$IMAGE_PULL_POLICY" != "Always" ]]; then
    echo "[${image}] exist, pass"
    return
  fi

  echo "[${image}] pulling"
  if [[ -n "${DOCKER_IMAGE_PREFIX}" && $(image_has_prefix "${image}") == "0" ]]; then
    docker pull "${DOCKER_IMAGE_PREFIX}/${image}"
    docker tag "${DOCKER_IMAGE_PREFIX}/${image}" "${image}"
    docker rmi -f "${DOCKER_IMAGE_PREFIX}/${image}"
  else
    docker pull "${image}"
  fi
  echo ""
}