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#!/usr/bin/env python
#
# Execute.py: this file is part of the GRS suite
# Copyright (C) 2015 Anthony G. Basile
#
# 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 os
import signal
import shlex
import subprocess
import sys
import time
from grs.Constants import CONST
class Execute():
""" Execute a shell command """
def __init__(
self, cmd, timeout=1, extra_env={}, failok=False, shell=False, logfile=CONST.LOGFILE
):
""" Execute a shell command.
cmd - Simple string of the command to be execute as a
fork()-ed child.
timeout - The time in seconds to wait() on the child before
sending a SIGTERM. timeout = None means wait indefinitely.
extra_env - Dictionary of extra environment variables for the fork()-ed
child. Note that the child inherits all the env variables
of the grandparent shell in which grsrun/grsup was spawned.
logfile - A file to log output to. If logfile = None, then we log
to sys.stdout.
"""
def signalexit():
pid = os.getpid()
while True:
os.kill(pid, signal.SIGTERM)
time.sleep(2.0)
if shell:
args = cmd
else:
args = shlex.split(cmd)
extra_env = dict(os.environ, **extra_env)
if logfile:
_file = open(logfile, 'a')
proc = subprocess.Popen(args, stdout=_file, stderr=_file, env=extra_env, shell=shell)
else:
_file = sys.stderr
proc = subprocess.Popen(args, env=extra_env, shell=shell)
try:
proc.wait(timeout)
timed_out = False
except subprocess.TimeoutExpired:
proc.kill()
timed_out = True
if not timed_out:
# _rc = None if we had a timeout
_rc = proc.returncode
if _rc:
_file.write('EXIT CODE: %d\n' % _rc)
if not failok:
_file.write('SENDING SIGTERM to pid = %d\n' % pid)
_file.close()
signalexit()
if timed_out:
_file.write('TIMEOUT ERROR: %s\n' % cmd)
if not failok:
_file.write('SENDING SIGTERM to pid = %d\n' % pid)
_file.close()
signalexit()
# Only close a logfile, don't close sys.stderr!
if logfile:
_file.close()
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