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from __future__ import print_function
import common
import os
import re
import sys
from subprocess import Popen, PIPE, check_output
PANIC_DUR = 10
DELAY = 30
DELAY_INTERVAL = 10
def get_cron_data():
try:
return check_output(['crontab', '-l'])
except:
return ""
def wall(message):
'''A wall command with no header'''
return "echo '%s' | wall -n" % message
def sanitize(args, ignored):
ret_args = []
for a in args:
if a in ignored:
continue
if '-' == a[0] and '--' != a[0:2]:
for i in ignored:
a = a.replace(i, '')
ret_args += [a]
return ret_args
def get_outfname():
return "cron-%s.txt" % common.get_cmd()
def get_boot_cron(ignored_params, extra=""):
'''Turn current python script into a crontab reboot entry'''
job_args = sanitize(sys.argv, ignored_params)
job = " ".join(job_args)
out_fname = get_outfname()
short_job = " ".join([common.get_cmd()] + job_args[1:])
msg = "Job '%s' will write output to '%s'" % (short_job, out_fname)
sys.stderr.write("%s %d seconds after reboot.\n" % (msg, DELAY))
# Create sleep and wall commands which will countdown DELAY seconds
# before executing the job
cmds = ["sleep %d" % DELAY_INTERVAL]
delay_rem = DELAY - DELAY_INTERVAL
while delay_rem > 0:
wmsg = "Restarting experiments in %d seconds. %s" % (delay_rem, extra)
cmds += [wall(wmsg)]
cmds += ["sleep %d" % min(DELAY_INTERVAL, delay_rem)]
delay_rem -= DELAY_INTERVAL
delay_cmd = ";".join(cmds)
# Create command which will only execute if the same kernel is running
kern = common.kernel()
fail_wall = wall("Need matching kernel '%s' to run!" % kern)
run_cmd = "echo '%s' | grep -q `uname -r` && %s && %s && %s >> %s 2>>%s || %s" %\
(kern, wall(msg), wall("Starting..."), job, out_fname, out_fname, fail_wall)
return "@reboot cd %s; %s; %s;" % (os.getcwd(), delay_cmd, run_cmd)
def set_panic_restart(bool_val):
'''Enable / disable restart on panics'''
if bool_val:
sys.stderr.write("Kernel will reboot after panic.\n")
dur = PANIC_DUR
else:
sys.stderr.write("Kernel will no longer reboot after panic.\n")
dur = 0
check_output(['sysctl', '-w', "kernel.panic=%d" % dur,
"kernel.panic_on_oops=%d" % dur])
def write_cron_data(data):
'''Write new crontab entry. No blank lines are written'''
# I don't know why "^\s*$" doesn't match, hence this ugly regex
data = re.sub(r"\n\s*\n", "\n", data, re.M)
sp = Popen(["crontab", "-"], stdin=PIPE)
stdout, stderr = sp.communicate(input=data)
def install_path():
'''Place the current path in the crontab entry'''
data = get_cron_data()
curr_line = re.findall(r"PATH=.*", data)
if curr_line:
curr_paths = re.findall(r"((?:\/\w+)+)", curr_line[0])
data = re.sub(curr_line[0], "", data)
else:
curr_paths = []
curr_paths = set(curr_paths)
for path in os.environ["PATH"].split(os.pathsep):
curr_paths.add(path)
data = "PATH=" + os.pathsep.join(curr_paths) + "\n" + data
write_cron_data(data)
def install_boot_job(ignored_params, reboot_message):
'''Re-run the current python script on system reboot using crontab'''
remove_boot_job()
data = get_cron_data()
job = get_boot_cron(ignored_params, reboot_message)
set_panic_restart(True)
write_cron_data(data + job + "\n")
if job not in get_cron_data():
raise IOError("Failed to write %s into cron!" % job)
else:
install_path()
def clean_output():
fname = get_outfname()
if os.path.exists(fname):
os.remove(fname)
def kill_boot_job():
remove_boot_job()
cmd = common.get_cmd()
procs = check_output("ps -eo pid,args".split(" "))
pairs = re.findall("(\d+) (.*)", procs)
for pid, args in pairs:
if re.search(r"/bin/sh -c.*%s"%cmd, args):
sys.stderr.write("Killing job %s\n" % pid)
check_output(("kill -9 %s" % pid).split(" "))
def remove_boot_job():
'''Remove installed reboot job from crontab'''
data = get_cron_data()
regex = re.compile(r".*%s.*" % re.escape(common.get_cmd()), re.M)
if regex.search(data):
new_cron = regex.sub("", data)
write_cron_data(new_cron)
set_panic_restart(False)
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