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Directory : /lib/python3/dist-packages/uaclient/

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Current File : /lib/python3/dist-packages/uaclient//snap.py

import logging
from typing import List, Optional

from uaclient import apt, status, util

SNAP_CMD = "/usr/bin/snap"
SNAP_INSTALL_RETRIES = [0.5, 1.0, 5.0]
HTTP_PROXY_OPTION = "proxy.http"
HTTPS_PROXY_OPTION = "proxy.https"


def is_installed() -> bool:
    """Returns whether or not snap is installed"""
    return "snapd" in apt.get_installed_packages()


def configure_snap_proxy(
    http_proxy: Optional[str] = None,
    https_proxy: Optional[str] = None,
    retry_sleeps: Optional[List[float]] = None,
) -> None:
    """
    Configure snap to use http and https proxies.

    :param http_proxy: http proxy to be used by snap. If None, it will
                       not be configured
    :param https_proxy: https proxy to be used by snap. If None, it will
                        not be configured
    :param retry_sleeps: Optional list of sleep lengths to apply between
        retries. Specifying a list of [0.5, 1] tells subp to retry twice
        on failure; sleeping half a second before the first retry and 1 second
        before the second retry.
    """
    if not util.which(SNAP_CMD):
        logging.debug(
            "Skipping configure snap proxy. {} does not exist.".format(
                SNAP_CMD
            )
        )
        return

    if http_proxy or https_proxy:
        print(status.MESSAGE_SETTING_SERVICE_PROXY.format(service="snap"))

    if http_proxy:
        util.subp(
            ["snap", "set", "system", "proxy.http={}".format(http_proxy)],
            retry_sleeps=retry_sleeps,
        )

    if https_proxy:
        util.subp(
            ["snap", "set", "system", "proxy.https={}".format(https_proxy)],
            retry_sleeps=retry_sleeps,
        )


def unconfigure_snap_proxy(
    protocol_type: str, retry_sleeps: Optional[List[float]] = None
) -> None:
    """
    Unset snap configuration settings for http and https proxies.

    :param protocol_type: String either http or https
    :param retry_sleeps: Optional list of sleep lengths to apply between
        retries. Specifying a list of [0.5, 1] tells subp to retry twice
        on failure; sleeping half a second before the first retry and 1 second
        before the second retry.
    """
    if not util.which(SNAP_CMD):
        logging.debug(
            "Skipping unconfigure snap proxy. {} does not exist.".format(
                SNAP_CMD
            )
        )
        return
    util.subp(
        ["snap", "unset", "system", "proxy.{}".format(protocol_type)],
        retry_sleeps=retry_sleeps,
    )


def get_config_option_value(key: str) -> Optional[str]:
    """
    Gets the config value from snap.
    :param protocol: can be any valid snap config option
    :return: the value of the snap config option, or None if not set
    """
    try:
        out, _ = util.subp(["snap", "get", "system", key])
        return out.strip()
    except util.ProcessExecutionError:
        return None

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