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#!/usr/bin/env python
import os
import signal
import shlex
import subprocess
import sys
from grs.Constants import CONST
class Execute():
""" Execute a shell command """
def __init__(self, cmd, timeout = 1, extra_env = {}, failok = 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()
f.write('SENDING SIGTERM to pid = %d\n' % pid)
f.close()
try:
os.kill(pid, signal.SIGTERM)
os.kill(pid, signal.SIGKILL)
except ProcessLookupError:
pass
args = shlex.split(cmd)
extra_env = dict(os.environ, **extra_env)
if logfile:
f = open(logfile, 'a')
proc = subprocess.Popen(args, stdout=f, stderr=f, env=extra_env)
else:
f = sys.stderr
proc = subprocess.Popen(args, env=extra_env)
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:
f.write('EXIT CODE: %d\n' % rc)
if not failok:
signalexit()
if timed_out:
f.write('TIMEOUT ERROR: %s\n' % cmd)
if not failok:
signalexit()
# Only close a logfile, don't close sys.stderr!
if logfile:
f.close()
|
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