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Use remount() to create a clean snapshot

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This commit is contained in:
Anders Ingemann 2013-10-06 14:44:23 +02:00
parent b025f6ed35
commit ceae489210
2 changed files with 11 additions and 8 deletions
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5
common/fs/__init__.py
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@ -28,11 +28,12 @@ def remount(volume, fn):
p_map.root.unmount() p_map.root.unmount()
if not isinstance(p_map, NoPartitions): if not isinstance(p_map, NoPartitions):
p_map.unmap(volume) p_map.unmap(volume)
fn() result = fn()
p_map.map(volume) p_map.map(volume)
else: else:
fn() result = fn()
p_map.root.mount(root_dir) p_map.root.mount(root_dir)
if hasattr(p_map, 'boot'): if hasattr(p_map, 'boot'):
p_map.boot.mount(boot_dir) p_map.boot.mount(boot_dir)
volume.mount_specials() volume.mount_specials()
return result

14
plugins/prebootstrapped/tasks.py
View file

@ -1,9 +1,9 @@
from base import Task from base import Task
from common import phases from common import phases
from providers.ec2.tasks import ebs
from common.tasks import volume from common.tasks import volume
from common.tasks import bootstrap from common.tasks import bootstrap
from common.tasks import filesystem from common.tasks import filesystem
from common.fs import remount
from shutil import copyfile from shutil import copyfile
import os.path import os.path
import time import time
@ -11,14 +11,16 @@ import logging
log = logging.getLogger(__name__) log = logging.getLogger(__name__)
class Snapshot(ebs.Snapshot): class Snapshot(Task):
description = 'Creating a snapshot of the bootstrapped volume' description = 'Creating a snapshot of the bootstrapped volume'
phase = phases.os_installation phase = phases.os_installation
after = [bootstrap.Bootstrap] after = [bootstrap.Bootstrap, filesystem.MountSpecials]
def run(self, info): def run(self, info):
super(Snapshot, self).run(info) def mk_snapshot():
msg = 'A snapshot of the bootstrapped volume was created. ID: {id}'.format(id=info.snapshot.id) return info.volume.snapshot()
snapshot = remount(info.volume, mk_snapshot)
msg = 'A snapshot of the bootstrapped volume was created. ID: {id}'.format(id=snapshot.id)
log.info(msg) log.info(msg)
@ -43,7 +45,7 @@ class CreateFromSnapshot(Task):
class CopyImage(Task): class CopyImage(Task):
description = 'Creating a snapshot of the bootstrapped volume' description = 'Creating a snapshot of the bootstrapped volume'
phase = phases.os_installation phase = phases.os_installation
after = [bootstrap.Bootstrap] after = [bootstrap.Bootstrap, filesystem.MountSpecials]
def run(self, info): def run(self, info):
loopback_backup_name = 'volume-{id:x}.{ext}.backup'.format(id=info.run_id, ext=info.volume.extension) loopback_backup_name = 'volume-{id:x}.{ext}.backup'.format(id=info.run_id, ext=info.volume.extension)