/usr/lib/python2.7/dist-packages/cloudinit/config/cc_migrator.py is in cloud-init 0.7.6~bzr976-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.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/>.
import os
import shutil
from cloudinit import helpers
from cloudinit import util
from cloudinit.settings import PER_ALWAYS
frequency = PER_ALWAYS
def _migrate_canon_sems(cloud):
paths = (cloud.paths.get_ipath('sem'), cloud.paths.get_cpath('sem'))
am_adjusted = 0
for sem_path in paths:
if not sem_path or not os.path.exists(sem_path):
continue
for p in os.listdir(sem_path):
full_path = os.path.join(sem_path, p)
if os.path.isfile(full_path):
(name, ext) = os.path.splitext(p)
canon_name = helpers.canon_sem_name(name)
if canon_name != name:
new_path = os.path.join(sem_path, canon_name + ext)
shutil.move(full_path, new_path)
am_adjusted += 1
return am_adjusted
def _migrate_legacy_sems(cloud, log):
legacy_adjust = {
'apt-update-upgrade': [
'apt-configure',
'package-update-upgrade-install',
],
}
paths = (cloud.paths.get_ipath('sem'), cloud.paths.get_cpath('sem'))
for sem_path in paths:
if not sem_path or not os.path.exists(sem_path):
continue
sem_helper = helpers.FileSemaphores(sem_path)
for (mod_name, migrate_to) in legacy_adjust.items():
possibles = [mod_name, helpers.canon_sem_name(mod_name)]
old_exists = []
for p in os.listdir(sem_path):
(name, _ext) = os.path.splitext(p)
if name in possibles and os.path.isfile(p):
old_exists.append(p)
for p in old_exists:
util.del_file(os.path.join(sem_path, p))
(_name, freq) = os.path.splitext(p)
for m in migrate_to:
log.debug("Migrating %s => %s with the same frequency",
p, m)
with sem_helper.lock(m, freq):
pass
def handle(name, cfg, cloud, log, _args):
do_migrate = util.get_cfg_option_str(cfg, "migrate", True)
if not util.translate_bool(do_migrate):
log.debug("Skipping module named %s, migration disabled", name)
return
sems_moved = _migrate_canon_sems(cloud)
log.debug("Migrated %s semaphore files to there canonicalized names",
sems_moved)
_migrate_legacy_sems(cloud, log)
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