Filename: //lib/python3//dist-packages///cloudinit//config/cc_power_state_change.py

# Copyright (C) 2011 Canonical Ltd. # # Author: Scott Moser <scott.moser@canonical.com> # # This file is part of cloud-init. See LICENSE file for license information. """ Power State Change ------------------ **Summary:** change power state This module handles shutdown/reboot after all config modules have been run. By default it will take no action, and the system will keep running unless a package installation/upgrade requires a system reboot (e.g. installing a new kernel) and ``package_reboot_if_required`` is true. The ``power_state`` config key accepts a dict of options. If ``mode`` is any value other than ``poweroff``, ``halt``, or ``reboot``, then no action will be taken. The system can be shutdown before cloud-init has finished using the ``timeout`` option. The ``delay`` key specifies a duration to be added onto any shutdown command used. Therefore, if a 5 minute delay and a 120 second shutdown are specified, the maximum amount of time between cloud-init starting and the system shutting down is 7 minutes, and the minimum amount of time is 5 minutes. The ``delay`` key must have an argument in either the form ``'+5'`` for 5 minutes or ``now`` for immediate shutdown. Optionally, a command can be run to determine whether or not the system should shut down. The command to be run should be specified in the ``condition`` key. For command formatting, see the documentation for ``cc_runcmd``. The specified shutdown behavior will only take place if the ``condition`` key is omitted or the command specified by the ``condition`` key returns 0. .. note:: With Alpine Linux any message value specified is ignored as Alpine's halt, poweroff, and reboot commands do not support broadcasting a message. **Internal name:** ``cc_power_state_change`` **Module frequency:** per instance **Supported distros:** all **Config keys**:: power_state: delay: <now/'+minutes'> mode: <poweroff/halt/reboot> message: <shutdown message> timeout: <seconds> condition: <true/false/command> """ import errno import os import re import subprocess import time from cloudinit.settings import PER_INSTANCE from cloudinit import subp from cloudinit import util frequency = PER_INSTANCE EXIT_FAIL = 254 def givecmdline(pid): # Returns the cmdline for the given process id. In Linux we can use procfs # for this but on BSD there is /usr/bin/procstat. try: # Example output from procstat -c 1 # PID COMM ARGS # 1 init /bin/init -- if util.is_FreeBSD(): (output, _err) = subp.subp(['procstat', '-c', str(pid)]) line = output.splitlines()[1] m = re.search(r'\d+ (\w|\.|-)+\s+(/\w.+)', line) return m.group(2) else: return util.load_file("/proc/%s/cmdline" % pid) except IOError: return None def check_condition(cond, log=None): if isinstance(cond, bool): if log: log.debug("Static Condition: %s" % cond) return cond pre = "check_condition command (%s): " % cond try: proc = subprocess.Popen(cond, shell=not isinstance(cond, list)) proc.communicate() ret = proc.returncode if ret == 0: if log: log.debug(pre + "exited 0. condition met.") return True elif ret == 1: if log: log.debug(pre + "exited 1. condition not met.") return False else: if log: log.warning(pre + "unexpected exit %s. " % ret + "do not apply change.") return False except Exception as e: if log: log.warning(pre + "Unexpected error: %s" % e) return False def handle(_name, cfg, cloud, log, _args): try: (args, timeout, condition) = load_power_state(cfg, cloud.distro) if args is None: log.debug("no power_state provided. doing nothing") return except Exception as e: log.warning("%s Not performing power state change!" % str(e)) return if condition is False: log.debug("Condition was false. Will not perform state change.") return mypid = os.getpid() cmdline = givecmdline(mypid) if not cmdline: log.warning("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, condition, execmd, [args, devnull_fp]) def load_power_state(cfg, distro): # 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, None) if not isinstance(pstate, dict): raise TypeError("power_state is not a dict.") modes_ok = ['halt', 'poweroff', 'reboot'] mode = pstate.get("mode") if mode not in distro.shutdown_options_map: raise TypeError( "power_state[mode] required, must be one of: %s. found: '%s'." % (','.join(modes_ok), mode)) args = distro.shutdown_command(mode=mode, delay=pstate.get("delay", "now"), message=pstate.get("message")) try: timeout = float(pstate.get('timeout', 30.0)) except ValueError as e: raise ValueError( "failed to convert timeout '%s' to float." % pstate['timeout'] ) from e condition = pstate.get("condition", True) if not isinstance(condition, (str, list, bool)): raise TypeError("condition type %s invalid. must be list, bool, str") return (args, timeout, condition) def doexit(sysexit): os._exit(sysexit) def execmd(exe_args, output=None, data_in=None): ret = 1 try: proc = subprocess.Popen(exe_args, stdin=subprocess.PIPE, stdout=output, stderr=subprocess.STDOUT) proc.communicate(data_in) ret = proc.returncode except Exception: doexit(EXIT_FAIL) doexit(ret) def run_after_pid_gone(pid, pidcmdline, timeout, log, condition, 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 def fatal(msg): if log: log.warning(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 = givecmdline(pid) 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 gone [%d]" % 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) try: if not check_condition(condition, log): return except Exception as e: fatal("Unexpected Exception when checking condition: %s" % e) func(*args) # vi: ts=4 expandtab

./Ninja\.