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# Copyright 2014 Open Source Robotics Foundation, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
try:
import pty
except ImportError:
# to support --cover-inclusive on Windows
if os.name not in ['nt']:
raise
from subprocess import Popen
from subprocess import STDOUT
import time
from .execute_process_nopty import _close_fds
from .execute_process_nopty import _yield_data
def _execute_process_pty(cmd, cwd, env, shell, stderr_to_stdout=True):
stdout_master, stdout_slave = None, None
stderr_master, stderr_slave = None, None
fds_to_close = [stdout_master, stdout_slave, stderr_master, stderr_slave]
try:
stdout_master, stdout_slave = pty.openpty()
if stderr_to_stdout:
stderr_master, stderr_slave = stdout_master, stdout_slave
else:
stderr_master, stderr_slave = pty.openpty()
p = None
while p is None:
try:
p = Popen(
cmd,
stdin=stdout_slave, stdout=stderr_slave, stderr=STDOUT,
cwd=cwd, env=env, shell=shell, close_fds=False)
except OSError as exc:
# This can happen if a file you are trying to execute is being
# written to simultaneously on Linux
# (doesn't appear to happen on OS X)
# It seems like the best strategy is to just try again later
# Worst case is that the file eventually gets deleted, then a
# different OSError would occur.
if 'Text file busy' in '{0}'.format(exc):
# This is a transient error, try again shortly
time.sleep(0.01)
continue
raise
# This causes the below select to exit when the subprocess closes.
# On Linux, this sometimes causes Errno 5 OSError's when os.read
# is called from within _yield_data, so on Linux _yield_data
# catches and passes on that particular OSError.
os.close(stdout_slave)
if not stderr_to_stdout:
os.close(stderr_slave)
left_overs = {stdout_master: b'', stderr_master: b''}
fds = [stdout_master]
if stderr_master != stdout_master:
fds.append(stderr_master)
finally:
# Make sure we don't leak file descriptors
_close_fds(fds_to_close)
# The linesep with pty's always seems to be "\r\n", even on OS X
return _yield_data(p, fds, left_overs, "\r\n", fds_to_close)
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