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import os
import subprocess
import platform
def shell_command(command, cwd=None, enable_stdin=False, enable_stdout=False, enable_stderr=False):
with open(os.devnull, 'w') as devnull_w, open(os.devnull, 'r') as devnull_r:
stdin = None if enable_stdin else devnull_r
stdout = None if enable_stdout else devnull_w
stderr = None if enable_stderr else devnull_w
executable = os.environ.get('SHELL')
if platform.system() == 'Windows':
# We avoid setting the executable kwarg on Windows because it does
# not have the desired effect when combined with shell=True. It
# will result in the correct program being run (e.g. bash), but it
# will be invoked with a '/c' argument instead of a '-c' argument,
# which it won't understand.
#
# See https://github.com/anishathalye/dotbot/issues/219 and
# https://bugs.python.org/issue40467.
#
# This means that complex commands that require Bash's parsing
# won't work; a workaround for this is to write the command as
# `bash -c "..."`.
executable = None
return subprocess.call(
command,
shell=True,
executable=executable,
stdin=stdin,
stdout=stdout,
stderr=stderr,
cwd=cwd
)
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