diff options
| -rw-r--r-- | cloudinit/config/cc_ubuntu_init_switch.py | 120 | ||||
| -rw-r--r-- | config/cloud.cfg | 1 |
2 files changed, 121 insertions, 0 deletions
diff --git a/cloudinit/config/cc_ubuntu_init_switch.py b/cloudinit/config/cc_ubuntu_init_switch.py new file mode 100644 index 00000000..3a2015e5 --- /dev/null +++ b/cloudinit/config/cc_ubuntu_init_switch.py @@ -0,0 +1,120 @@ +# 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))) diff --git a/config/cloud.cfg b/config/cloud.cfg index b746e3db..200050d3 100644 --- a/config/cloud.cfg +++ b/config/cloud.cfg @@ -24,6 +24,7 @@ preserve_hostname: false # The modules that run in the 'init' stage cloud_init_modules: - migrator + - ubuntu-init-switch - seed_random - bootcmd - write-files |