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# vi: ts=4 expandtab
#
# Copyright (C) 2011 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# 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/>.
from cloudinit.settings import PER_INSTANCE
from cloudinit import util
import errno
import os
import re
import subprocess
import time
frequency = PER_INSTANCE
EXIT_FAIL = 254
def handle(_name, cfg, _cloud, log, _args):
try:
(args, timeout) = load_power_state(cfg)
if args is None:
log.debug("no power_state provided. doing nothing")
return
except Exception as e:
log.warn("%s Not performing power state change!" % str(e))
return
mypid = os.getpid()
cmdline = util.load_file("/proc/%s/cmdline" % mypid)
if not cmdline:
log.warn("power_state: failed to get cmdline of current process")
return
devnull_fp = open(os.devnull, "w")
log.debug("After pid %s ends, will execute: %s" % (mypid, ' '.join(args)))
util.fork_cb(run_after_pid_gone, mypid, cmdline, timeout, log, execmd,
[args, devnull_fp])
def load_power_state(cfg):
# returns a tuple of shutdown_command, timeout
# shutdown_command is None if no config found
pstate = cfg.get('power_state')
if pstate is None:
return (None, None)
if not isinstance(pstate, dict):
raise TypeError("power_state is not a dict.")
opt_map = {'halt': '-H', 'poweroff': '-P', 'reboot': '-r'}
mode = pstate.get("mode")
if mode not in opt_map:
raise TypeError("power_state[mode] required, must be one of: %s." %
','.join(opt_map.keys()))
delay = pstate.get("delay", "now")
if delay != "now" and not re.match(r"\+[0-9]+", delay):
raise TypeError("power_state[delay] must be 'now' or '+m' (minutes).")
args = ["shutdown", opt_map[mode], delay]
if pstate.get("message"):
args.append(pstate.get("message"))
try:
timeout = float(pstate.get('timeout', 30.0))
except ValueError:
raise ValueError("failed to convert timeout '%s' to float." %
pstate['timeout'])
return (args, timeout)
def doexit(sysexit):
os._exit(sysexit) # pylint: disable=W0212
def execmd(exe_args, output=None, data_in=None):
try:
proc = subprocess.Popen(exe_args, stdin=subprocess.PIPE,
stdout=output, stderr=subprocess.STDOUT)
proc.communicate(data_in)
ret = proc.returncode # pylint: disable=E1101
except Exception:
doexit(EXIT_FAIL)
doexit(ret)
def run_after_pid_gone(pid, pidcmdline, timeout, log, func, args):
# wait until pid, with /proc/pid/cmdline contents of pidcmdline
# is no longer alive. After it is gone, or timeout has passed
# execute func(args)
msg = None
end_time = time.time() + timeout
cmdline_f = "/proc/%s/cmdline" % pid
def fatal(msg):
if log:
log.warn(msg)
doexit(EXIT_FAIL)
known_errnos = (errno.ENOENT, errno.ESRCH)
while True:
if time.time() > end_time:
msg = "timeout reached before %s ended" % pid
break
try:
cmdline = ""
with open(cmdline_f) as fp:
cmdline = fp.read()
if cmdline != pidcmdline:
msg = "cmdline changed for %s [now: %s]" % (pid, cmdline)
break
except IOError as ioerr:
if ioerr.errno in known_errnos:
msg = "pidfile '%s' gone [%d]" % (cmdline_f, ioerr.errno)
else:
fatal("IOError during wait: %s" % ioerr)
break
except Exception as e:
fatal("Unexpected Exception: %s" % e)
time.sleep(.25)
if not msg:
fatal("Unexpected error in run_after_pid_gone")
if log:
log.debug(msg)
func(*args)
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