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# Copyright (C) 2012 Yahoo! Inc.
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#
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# Author: Joshua Harlow <harlowja@yahoo-inc.com>
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#
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# This file is part of cloud-init. See LICENSE file for license information.
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"""
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Migrator
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--------
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**Summary:** migrate old versions of cloud-init data to new
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This module handles moving old versions of cloud-init data to newer ones.
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Currently, it only handles renaming cloud-init's per-frequency semaphore files
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to canonicalized name and renaming legacy semaphore names to newer ones. This
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module is enabled by default, but can be disabled by specifying ``migrate:
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false`` in config.
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**Internal name:** ``cc_migrator``
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**Module frequency:** per always
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**Supported distros:** all
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**Config keys**::
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migrate: <true/false>
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"""
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import os
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import shutil
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from cloudinit import helpers
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from cloudinit import util
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from cloudinit.settings import PER_ALWAYS
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frequency = PER_ALWAYS
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def _migrate_canon_sems(cloud):
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paths = (cloud.paths.get_ipath('sem'), cloud.paths.get_cpath('sem'))
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am_adjusted = 0
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for sem_path in paths:
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if not sem_path or not os.path.exists(sem_path):
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continue
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for p in os.listdir(sem_path):
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full_path = os.path.join(sem_path, p)
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if os.path.isfile(full_path):
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(name, ext) = os.path.splitext(p)
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canon_name = helpers.canon_sem_name(name)
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if canon_name != name:
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new_path = os.path.join(sem_path, canon_name + ext)
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shutil.move(full_path, new_path)
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am_adjusted += 1
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return am_adjusted
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def _migrate_legacy_sems(cloud, log):
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legacy_adjust = {
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'apt-update-upgrade': [
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'apt-configure',
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'package-update-upgrade-install',
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],
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}
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paths = (cloud.paths.get_ipath('sem'), cloud.paths.get_cpath('sem'))
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for sem_path in paths:
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if not sem_path or not os.path.exists(sem_path):
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continue
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sem_helper = helpers.FileSemaphores(sem_path)
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for (mod_name, migrate_to) in legacy_adjust.items():
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possibles = [mod_name, helpers.canon_sem_name(mod_name)]
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old_exists = []
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for p in os.listdir(sem_path):
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(name, _ext) = os.path.splitext(p)
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if name in possibles and os.path.isfile(p):
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old_exists.append(p)
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for p in old_exists:
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util.del_file(os.path.join(sem_path, p))
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(_name, freq) = os.path.splitext(p)
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for m in migrate_to:
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log.debug("Migrating %s => %s with the same frequency",
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p, m)
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with sem_helper.lock(m, freq):
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pass
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def handle(name, cfg, cloud, log, _args):
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do_migrate = util.get_cfg_option_str(cfg, "migrate", True)
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if not util.translate_bool(do_migrate):
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log.debug("Skipping module named %s, migration disabled", name)
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return
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sems_moved = _migrate_canon_sems(cloud)
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log.debug("Migrated %s semaphore files to there canonicalized names",
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sems_moved)
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_migrate_legacy_sems(cloud, log)
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# vi: ts=4 expandtab
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