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# vi: ts=4 expandtab
#
# Copyright (C) 2014 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 log as logging
from cloudinit import util
from cloudinit.distros import ubuntu
import os
import time
frequency = PER_INSTANCE
REBOOT_CMD = ["/sbin/reboot"]
DEFAULT_CONFIG = {
'init_switch': {'target': None}
}
SWITCH_INIT = """
#!/bin/sh
# switch_init: [upstart | systemd]
is_systemd() {
[ "$(dpkg-divert --listpackage /sbin/init)" = "systemd-sysv" ]
}
debug() { echo "$@" 1>&2; }
fail() { echo "$@" 1>&2; exit 1; }
if [ "$1" = "systemd" ]; then
if is_systemd; then
debug "already systemd, nothing to do"
else
[ -f /lib/systemd/systemd ] || fail "no systemd available";
dpkg-divert --package systemd-sysv --divert /sbin/init.diverted \\
--rename /sbin/init
fi
[ -f /sbin/init ] || ln /lib/systemd/systemd /sbin/init
elif [ "$1" = "upstart" ]; then
if is_systemd; then
rm -f /sbin/init
dpkg-divert --package systemd-sysv --rename --remove /sbin/init
else
debug "already upstart, nothing to do."
fi
else
fail "Error. expect 'upstart' or 'systemd'"
fi
"""
def handle(name, cfg, cloud, log, _args):
if not isinstance(cloud.distro, ubuntu.Distro):
log.debug("%s: distro is '%s', not ubuntu. returning",
name, cloud.distro.__class__)
return
cfg = util.mergemanydict(cfg, DEFAULT_CONFIG)
target = cfg['init_switch']['target']
if not target:
log.debug("%s: target=%s. nothing to do", name, target)
return
supported = ('upstart', 'systemd')
if target not in supported:
log.warn("%s: target set to %s, expected one of: %s",
name, target, str(supported))
if os.path.exists("/run/systemd/systemd"):
current = "systemd"
else:
current = "upstart"
if current == target:
log.debug("%s: current = target = %s. nothing to do", name, target)
return
try:
util.subp(['sh', '-c', SWITCH_INIT, '--', target])
except util.ProcessExecutionError as e:
log.warn("%s: Failed to switch to init '%s'. %s", name, target, e)
return
try:
log.warn("%s: rebooting from '%s' to '%s'", name, current, target)
logging.flushLoggers(log)
_fire_reboot(log, initial_sleep=4)
except Exception as e:
util.logexc(log, "Requested reboot did not happen!")
raise
def _fire_reboot(log, wait_attempts=6, initial_sleep=1, backoff=2):
util.subp(REBOOT_CMD)
start = time.time()
wait_time = initial_sleep
for _i in range(0, wait_attempts):
time.sleep(wait_time)
wait_time *= backoff
elapsed = time.time() - start
log.debug("Rebooted, but still running after %s seconds", int(elapsed))
# If we got here, not good
elapsed = time.time() - start
raise RuntimeError(("Reboot did not happen"
" after %s seconds!") % (int(elapsed)))
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