115 lines
3.8 KiB
Python
115 lines
3.8 KiB
Python
# Copyright 2015 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import os
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from oslo_concurrency import processutils as putils
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from oslo_config import cfg
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from taskflow.patterns import linear_flow as lf
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from taskflow import task
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from glance import i18n
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_ = i18n._
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_LI = i18n._LI
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_LE = i18n._LE
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_LW = i18n._LW
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LOG = logging.getLogger(__name__)
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convert_task_opts = [
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cfg.StrOpt('conversion_format',
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choices=('qcow2', 'raw', 'vmdk'),
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help=_("The format to which images will be automatically "
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"converted.")),
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]
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CONF = cfg.CONF
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# NOTE(flaper87): Registering under the taskflow_executor section
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# for now. It seems a waste to have a whole section dedicated to a
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# single task with a single option.
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CONF.register_opts(convert_task_opts, group='taskflow_executor')
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class _Convert(task.Task):
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conversion_missing_warned = False
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def __init__(self, task_id, task_type, image_repo):
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self.task_id = task_id
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self.task_type = task_type
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self.image_repo = image_repo
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super(_Convert, self).__init__(
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name='%s-Convert-%s' % (task_type, task_id))
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def execute(self, image_id, file_path):
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# NOTE(flaper87): A format must be explicitly
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# specified. There's no "sane" default for this
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# because the dest format may work differently depending
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# on the environment OpenStack is running in.
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conversion_format = CONF.taskflow_executor.conversion_format
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if conversion_format is None:
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if not _Convert.conversion_missing_warned:
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msg = (_LW('The conversion format is None, please add a value '
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'for it in the config file for this task to '
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'work: %s') %
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self.task_id)
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LOG.warn(msg)
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_Convert.conversion_missing_warned = True
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return
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# TODO(flaper87): Check whether the image is in the desired
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# format already. Probably using `qemu-img` just like the
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# `Introspection` task.
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dest_path = os.path.join(CONF.task.work_dir, "%s.converted" % image_id)
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stdout, stderr = putils.trycmd('qemu-img', 'convert', '-O',
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conversion_format, file_path, dest_path,
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log_errors=putils.LOG_ALL_ERRORS)
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if stderr:
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raise RuntimeError(stderr)
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os.rename(dest_path, file_path.split("file://")[-1])
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return file_path
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def revert(self, image_id, result=None, **kwargs):
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# NOTE(flaper87): If result is None, it probably
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# means this task failed. Otherwise, we would have
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# a result from its execution.
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if result is None:
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return
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fs_path = result.split("file://")[-1]
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if os.path.exists(fs_path):
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os.path.remove(fs_path)
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def get_flow(**kwargs):
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"""Return task flow for converting images to different formats.
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:param task_id: Task ID.
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:param task_type: Type of the task.
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:param image_repo: Image repository used.
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"""
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task_id = kwargs.get('task_id')
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task_type = kwargs.get('task_type')
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image_repo = kwargs.get('image_repo')
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return lf.Flow(task_type).add(
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_Convert(task_id, task_type, image_repo),
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)
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