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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 logging
import tempfile
import subprocess
from typing import List, Tuple, Union
from libvirtnbdbackup.qemu.exceptions import (
ProcessError,
)
from libvirtnbdbackup.output import openfile
from libvirtnbdbackup.objects import processInfo
log = logging.getLogger(__name__)
def _readlog(logFile: str, cmd: str) -> str:
try:
with openfile(logFile, "rb") as fh:
return fh.read().decode().strip()
except Exception as errmsg:
log.exception(errmsg)
raise ProcessError(
f"Failed to execute [{cmd}]: Unable to get error message: {errmsg}"
) from errmsg
def _readpipe(p) -> Tuple[str, str]:
out = p.stdout.read().decode().strip()
err = p.stderr.read().decode().strip()
return out, err
def run(cmdLine: List[str], pidFile: str = "", toPipe: bool = False) -> processInfo:
"""Execute passed command"""
logFileName: str = ""
logFile: Union[int, tempfile._TemporaryFileWrapper]
if toPipe is True:
logFile = subprocess.PIPE
else:
# pylint: disable=consider-using-with
logFile = tempfile.NamedTemporaryFile(
delete=False, prefix=cmdLine[0], suffix=".log"
)
logFileName = logFile.name
log.debug("CMD: %s", " ".join(cmdLine))
try:
with subprocess.Popen(
cmdLine,
close_fds=True,
stderr=logFile,
stdout=logFile,
) as p:
p.wait()
log.debug("Return code: %s", p.returncode)
err: str = ""
out: str = ""
if p.returncode != 0:
log.error("CMD: %s", " ".join(cmdLine))
log.debug("Read error messages from logfile")
if toPipe is True:
out, err = _readpipe(p)
else:
err = _readlog(logFileName, cmdLine[0])
raise ProcessError(f"Unable to start [{cmdLine[0]}] error: [{err}]")
if toPipe is True:
out, err = _readpipe(p)
if pidFile != "":
realPid = int(_readlog(pidFile, ""))
else:
realPid = p.pid
process = processInfo(realPid, logFileName, err, out, pidFile)
log.debug("Started [%s] process: [%s]", cmdLine[0], process)
except FileNotFoundError as e:
raise ProcessError(e) from e
return process
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