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calibre-web/cps/subproc_wrapper.py

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# -*- coding: utf-8 -*-
# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
# Copyright (C) 2018-2019 OzzieIsaacs
#
# 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 <http://www.gnu.org/licenses/>.
import sys
import os
import subprocess
import re
def process_open(command, quotes=(), env=None, sout=subprocess.PIPE, serr=subprocess.PIPE, newlines=True):
# Linux py2.7 encode as list without quotes no empty element for parameters
# linux py3.x no encode and as list without quotes no empty element for parameters
# windows py2.7 encode as string with quotes empty element for parameters is okay
# windows py 3.x no encode and as string with quotes empty element for parameters is okay
# separate handling for windows and linux
if os.name == 'nt':
for key, element in enumerate(command):
if key in quotes:
command[key] = '"' + element + '"'
exc_command = " ".join(command)
else:
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exc_command = [x for x in command]
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return subprocess.Popen(exc_command, shell=False, stdout=sout, stderr=serr, universal_newlines=newlines, env=env) # nosec
def process_wait(command, serr=subprocess.PIPE, pattern=""):
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# Run command, wait for process to terminate, and return an iterator over lines of its output.
newlines = os.name != 'nt'
ret_val = ""
p = process_open(command, serr=serr, newlines=newlines)
p.wait()
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for line in p.stdout.readlines():
if isinstance(line, bytes):
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line = line.decode('utf-8', errors="ignore")
match = re.search(pattern, line, re.IGNORECASE)
if match and ret_val == "":
ret_val = match
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break
p.stdout.close()
p.stderr.close()
return ret_val