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# This file is part of ranger, the console file manager.
# License: GNU GPL version 3, see the file "AUTHORS" for details.
from __future__ import (absolute_import, print_function)
from os import devnull
from subprocess import Popen, PIPE, CalledProcessError
ENCODING = 'utf-8'
def check_output(popenargs, **kwargs):
"""Runs a program, waits for its termination and returns its output
This function is functionally identical to python 2.7's subprocess.check_output,
but is favored due to python 2.6 compatibility.
Will be run through a shell if `popenargs` is a string, otherwise the command
is executed directly.
The keyword argument `decode` determines if the output shall be decoded
with the encoding UTF-8.
Further keyword arguments are passed to Popen.
"""
do_decode = kwargs.pop('decode', True)
kwargs.setdefault('stdout', PIPE)
kwargs.setdefault('shell', isinstance(popenargs, str))
if 'stderr' in kwargs:
process = Popen(popenargs, **kwargs)
stdout, _ = process.communicate()
else:
with open(devnull, mode='w') as fd_devnull:
process = Popen(popenargs, stderr=fd_devnull, **kwargs)
stdout, _ = process.communicate()
if process.returncode != 0:
error = CalledProcessError(process.returncode, popenargs)
error.output = stdout
raise error
if do_decode and stdout is not None:
stdout = stdout.decode(ENCODING)
return stdout
def spawn(*popenargs, **kwargs):
"""Runs a program, waits for its termination and returns its stdout
This function is similar to python 2.7's subprocess.check_output,
but is favored due to python 2.6 compatibility.
The arguments may be:
spawn(string)
spawn(command, arg1, arg2...)
spawn([command, arg1, arg2])
Will be run through a shell if `popenargs` is a string, otherwise the command
is executed directly.
The keyword argument `decode` determines if the output shall be decoded
with the encoding UTF-8.
Further keyword arguments are passed to Popen.
"""
if len(popenargs) == 1:
return check_output(popenargs[0], **kwargs)
return check_output(list(popenargs), **kwargs)
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