/usr/lib/python3/dist-packages/checkbox/lib/redirect.py is in python3-checkbox 0.17.6-0ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of Checkbox.
#
# Copyright 2008 Canonical Ltd.
#
# Checkbox is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# Checkbox 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 Checkbox. If not, see <http://www.gnu.org/licenses/>.
#
import os
import sys
import tempfile
def _file_write(file):
# file is a filename, a pipe-command, a fileno(), or a file
# returns file.
if not hasattr(file, "write"):
if file[0] == "|":
file = os.popen(file[1:], "w")
else:
file = open(file, "w")
return file
def _file_read(file):
# file is a filename, a pipe-command, or a file
# returns file.
if not hasattr(file, "read"):
if file[-1] == "|":
file = os.popen(file[1:], "r")
else:
file = open(file, "r")
return file
def redirect_to_file(file, func, *args):
# apply func(args), temporarily redirecting stdout to file.
# file can be a file or any writable object, or a filename string.
# a "|cmd" string will pipe output to cmd.
# Returns value of apply(func, *args)
ret = None
file = _file_write(file)
sys.stdout, file = file, sys.stdout
try:
ret = func(*args)
finally:
print(ret)
sys.stdout, file = file, sys.stdout
return ret
def redirect_to_string(func, *args):
# apply func(*args) with stdout redirected to return string.
file = tempfile.TemporaryFile()
redirect_to_file(*(file, func) + args)
file.seek(0)
return file.read()
def redirect_to_lines(func, *args):
# apply func(*args), returning a list of redirected stdout lines.
file = tempfile.TemporaryFile()
redirect_to_file(*(file, func) + args)
file.seek(0)
return file.readlines()
class RedirectTee:
def __init__(self, *optargs):
self._files = []
for arg in optargs:
self.addfile(arg)
def addfile(self, file):
self._files.append(_file_write(file))
def remfile(self, file):
file.flush()
self._files.remove(file)
def files(self):
return self._files
def write(self, what):
for eachfile in self._files:
eachfile.write(what)
def writelines(self, lines):
for eachline in lines: self.write(eachline)
def flush(self):
for eachfile in self._files:
eachfile.flush()
def close(self):
for eachfile in self._files:
self.remfile(eachfile) # Don't CLOSE the real files.
def CLOSE(self):
for eachfile in self._files:
self.remfile(eachfile)
self.eachfile.close()
def isatty(self):
return 0
class RedirectEcho:
def __init__(self, input, *output):
self._infile = _file_read(input)
if output:
self._output = _file_write(output[0])
else:
self._output = None
def read(self, *howmuch):
stuff = self._infile.read(*howmuch)
if self._output:
self._output.write(stuff)
return stuff
def readline(self):
line = self._infile.readline()
self._output.write(line)
return line
def readlines(self):
out = []
while True:
out.append(self.readline())
if not out[-1]:
return out[:-1]
def flush(self):
self._output.flush()
def seek(self, where, how):
self._infile.seek(where, how)
def tell(self):
return self._infile.tell()
def isatty(self):
return self._infile.isatty()
def close(self):
self._infile.close()
self._output.close()
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