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#!/usr/bin/python3
"""
Copyright (C) 2023 Michael Ablassmeier <abi@grinser.de>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import os
import sys
import shutil
import logging
from argparse import Namespace
from libvirtnbdbackup import common as lib
def executables() -> None:
"""Check if required utils are installed"""
for exe in ("nbdkit", "qemu-nbd"):
if not shutil.which(exe):
logging.error("Please install required [%s] utility.", exe)
def device(args: Namespace) -> None:
"""Check if /dev/nbdX exists, otherwise it is likely
nbd module isn't loaded on the system"""
if not args.device.startswith("/dev/nbd"):
logging.error("Target device [%s] seems not to be an NBD device?", args.device)
if not lib.exists(args, args.device):
logging.error(
"Target device [%s] does not exist, please load nbd module: [modprobe nbd]",
args.device,
)
def plugin(args: Namespace) -> str:
"""Attempt to locate the nbdkit plugin that is passed to the
nbdkit process"""
pluginFileName = "virtnbd-nbdkit-plugin"
installDir = os.path.dirname(sys.argv[0])
nbdkitModule = f"{installDir}/{pluginFileName}"
if not lib.exists(args, nbdkitModule):
logging.error("Failed to locate nbdkit plugin: [%s]", pluginFileName)
return nbdkitModule
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