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# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""
Migrator
--------
**Summary:** migrate old versions of cloud-init data to new
This module handles moving old versions of cloud-init data to newer ones.
Currently, it only handles renaming cloud-init's per-frequency semaphore files
to canonicalized name and renaming legacy semaphore names to newer ones. This
module is enabled by default, but can be disabled by specifying ``migrate:
false`` in config.
**Internal name:** ``cc_migrator``
**Module frequency:** per always
**Supported distros:** all
**Config keys**::
migrate: <true/false>
"""
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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