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"""
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 zlib
import logging
import builtins
from typing import IO, Union, Any
from libvirtnbdbackup.output import exceptions
if sys.version_info >= (3, 8):
from typing import Literal
else:
from typing_extensions import Literal
log = logging.getLogger("directory")
class Directory:
"""Backup to target directory"""
def __init__(self) -> None:
self.fileHandle: IO[Any]
self.chksum: int = 1
def create(self, targetDir) -> None:
"""Create wrapper"""
log.debug("Create: %s", targetDir)
if os.path.exists(targetDir):
if not os.path.isdir(targetDir):
raise exceptions.OutputCreateDirectory(
"Specified target is a file, not a directory"
)
if not os.path.exists(targetDir):
try:
os.makedirs(targetDir)
except OSError as e:
raise exceptions.OutputCreateDirectory(
f"Failed to create target directory: [{e}]"
)
def open(
self,
targetFile: str,
mode: Union[Literal["w"], Literal["wb"], Literal["rb"], Literal["r"]] = "wb",
) -> IO[Any]:
"""Open target file"""
try:
# pylint: disable=unspecified-encoding,consider-using-with
self.fileHandle = builtins.open(targetFile, mode)
return self.fileHandle
except OSError as e:
raise exceptions.OutputOpenException(
f"Opening target file [{targetFile}] failed: {e}"
) from e
def write(self, data: bytes) -> int:
"""Write wrapper"""
self.chksum = zlib.adler32(data, self.chksum)
written = self.fileHandle.write(data)
assert written == len(data)
return written
def read(self, size=-1) -> int:
"""Read wrapper"""
return self.fileHandle.read(size)
def flush(self) -> None:
"""Flush wrapper"""
return self.fileHandle.flush()
def truncate(self, size: int) -> None:
"""Truncate target file"""
try:
self.fileHandle.truncate(size)
self.fileHandle.seek(0)
except OSError as e:
raise exceptions.OutputException(
f"Failed to truncate target file: [{e}]"
) from e
def close(self) -> None:
"""Close wrapper"""
log.debug("Close file")
self.fileHandle.close()
def seek(self, tgt: int, whence: int = 0) -> int:
"""Seek wrapper"""
return self.fileHandle.seek(tgt, whence)
def checksum(self) -> int:
"""Return computed checksum"""
cur = self.chksum
self.chksum = 1
return cur
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