1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
# 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 signal
import subprocess
import time
frequency = PER_INSTANCE
EXIT_FAIL = 254
#
# Returns the cmdline for the given process id. In Linux we can use procfs for
# this but on BSD there is /usr/bin/procstat.
#
def givecmdline(pid):
try:
# Example output from procstat -c 1
# PID COMM ARGS
# 1 init /bin/init --
if util.system_info()["platform"].startswith('FreeBSD'):
(output, _err) = util.subp(['procstat', '-c', str(pid)])
line = output.splitlines()[1]
m = re.search('\d+ (\w|\.|-)+\s+(/\w.+)', line)
return m.group(2)
else:
return util.load_file("/proc/%s/cmdline" % pid)
except IOError:
return None
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 = givecmdline(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")
# convert integer 30 or string '30' to '+30'
try:
delay = "+%s" % int(delay)
except ValueError:
pass
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
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 = 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)
func(*args)
|
