69 lines
2.5 KiB
Python
Executable file
69 lines
2.5 KiB
Python
Executable file
#!/usr/bin/python
|
|
|
|
import common
|
|
import sys, os, signal, time, subprocess, fcntl
|
|
|
|
logdir = sys.argv[1]
|
|
stdout_start = int(sys.argv[2]) # number of bytes we can skip on stdout
|
|
stderr_start = int(sys.argv[3]) # nubmer of bytes we can skip on stderr
|
|
# TODO (crosbug.com/38224)- sbasi: Remove extra logging.
|
|
stderr = open(os.path.join(logdir, 'stderr'), 'a', 0)
|
|
|
|
print >> stderr, 'Entered autotestd_monitor.'
|
|
# if any of our tail processes die, the monitor should die too
|
|
def kill_self(signum, frame):
|
|
os.kill(os.getpid(), signal.SIGTERM)
|
|
signal.signal(signal.SIGCHLD, kill_self)
|
|
|
|
devnull = open(os.devnull, 'w')
|
|
|
|
# launch some tail processes to pump the std* streams
|
|
def launch_tail(filename, outstream, start):
|
|
path = os.path.join(logdir, filename)
|
|
argv = ['tail', '--retry', '--follow=name', '--bytes=+%d' % start, path]
|
|
# stdout=sys.stdout fails on pre-2.5 python (bug in subprocess module)
|
|
if outstream != subprocess.PIPE and outstream.fileno() == 1:
|
|
return subprocess.Popen(argv, stderr=devnull)
|
|
else:
|
|
return subprocess.Popen(argv, stdout=outstream, stderr=devnull)
|
|
stdout_pump = launch_tail('stdout', sys.stdout, stdout_start)
|
|
stderr_pump = launch_tail('stderr', sys.stderr, stderr_start)
|
|
|
|
print >> stderr, 'Finished launching tail subprocesses.'
|
|
|
|
# wait for logdir/started to exist to be sure autotestd is started
|
|
start_time = time.time()
|
|
started_file_path = os.path.join(logdir, 'started')
|
|
while not os.path.exists(started_file_path):
|
|
time.sleep(1)
|
|
if time.time() - start_time >= 30:
|
|
raise Exception("autotestd failed to start in %s" % logdir)
|
|
|
|
print >> stderr, 'Finished waiting on autotestd to start.'
|
|
|
|
# watch the exit code file for an exit
|
|
exit_code_file = open(os.path.join(logdir, 'exit_code'))
|
|
fcntl.flock(exit_code_file, fcntl.LOCK_EX)
|
|
print >> stderr, 'Got lock of exit_code_file.'
|
|
try:
|
|
exit_code = exit_code_file.read()
|
|
if len(exit_code) != 4:
|
|
exit_code = -signal.SIGKILL # autotestd was nuked
|
|
else:
|
|
exit_code = int(exit_code)
|
|
finally:
|
|
fcntl.flock(exit_code_file, fcntl.LOCK_UN)
|
|
exit_code_file.close()
|
|
print >> stderr, 'Released lock of exit_code_file and closed it.'
|
|
|
|
# tail runs in 1s polling loop, so give them a chance to finish
|
|
time.sleep(2)
|
|
|
|
print >> stderr, 'Killing child processes.'
|
|
# clear the SIGCHLD handler so that killing the tails doesn't kill us
|
|
signal.signal(signal.SIGCHLD, signal.SIG_DFL)
|
|
os.kill(stdout_pump.pid, signal.SIGTERM)
|
|
os.kill(stderr_pump.pid, signal.SIGTERM)
|
|
|
|
# exit (with the same code as autotestd)
|
|
sys.exit(exit_code)
|