168 lines
5.7 KiB
Python
168 lines
5.7 KiB
Python
# Copyright 2018 Red Hat, Inc.
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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 json
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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 oslo_log import log as logging
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from oslo_utils import encodeutils
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from oslo_utils import excutils
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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.async_ import utils
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from glance.i18n import _
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LOG = logging.getLogger(__name__)
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conversion_plugin_opts = [
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cfg.StrOpt('output_format',
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default='raw',
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choices=('qcow2', 'raw', 'vmdk'),
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help=_("""
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Desired output format for image conversion plugin.
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Provide a valid image format to which the conversion plugin
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will convert the image before storing it to the back-end.
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Note, if the Image Conversion plugin for image import is defined, users
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should only upload disk formats that are supported by `quemu-img` otherwise
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the conversion and import will fail.
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Possible values:
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* qcow2
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* raw
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* vmdk
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Related Options:
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* disk_formats
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""")),
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]
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CONF = cfg.CONF
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CONF.register_opts(conversion_plugin_opts, group='image_conversion')
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class _ConvertImage(task.Task):
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default_provides = 'file_path'
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def __init__(self, context, task_id, task_type,
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image_repo, image_id):
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self.context = context
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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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self.image_id = image_id
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self.dest_path = ""
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self.python = CONF.wsgi.python_interpreter
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super(_ConvertImage, self).__init__(
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name='%s-Convert_Image-%s' % (task_type, task_id))
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def execute(self, file_path, **kwargs):
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target_format = CONF.image_conversion.output_format
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# TODO(jokke): Once we support other schemas we need to take them into
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# account and handle the paths here.
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src_path = file_path.split('file://')[-1]
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dest_path = "%(path)s.%(target)s" % {'path': src_path,
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'target': target_format}
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self.dest_path = dest_path
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try:
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stdout, stderr = putils.trycmd("qemu-img", "info",
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"--output=json",
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src_path,
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prlimit=utils.QEMU_IMG_PROC_LIMITS,
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python_exec=self.python,
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log_errors=putils.LOG_ALL_ERRORS,)
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except OSError as exc:
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with excutils.save_and_reraise_exception():
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exc_message = encodeutils.exception_to_unicode(exc)
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msg = ("Failed to do introspection as part of image "
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"conversion for %(iid)s: %(err)s")
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LOG.error(msg, {'iid': self.image_id, 'err': exc_message})
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if stderr:
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raise RuntimeError(stderr)
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metadata = json.loads(stdout)
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source_format = metadata.get('format')
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virtual_size = metadata.get('virtual-size', 0)
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image = self.image_repo.get(self.image_id)
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image.virtual_size = virtual_size
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if source_format == target_format:
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LOG.debug("Source is already in target format, "
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"not doing conversion for %s", self.image_id)
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self.image_repo.save(image)
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return file_path
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try:
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stdout, stderr = putils.trycmd('qemu-img', 'convert',
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'-f', source_format,
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'-O', target_format,
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src_path, dest_path,
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log_errors=putils.LOG_ALL_ERRORS)
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except OSError as exc:
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with excutils.save_and_reraise_exception():
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exc_message = encodeutils.exception_to_unicode(exc)
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msg = "Failed to do image conversion for %(iid)s: %(err)s"
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LOG.error(msg, {'iid': self.image_id, 'err': exc_message})
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if stderr:
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raise RuntimeError(stderr)
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image.disk_format = target_format
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image.container_format = 'bare'
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self.image_repo.save(image)
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os.remove(src_path)
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return "file://%s" % dest_path
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def revert(self, 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 not None:
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LOG.debug("Image conversion failed.")
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if os.path.exists(self.dest_path):
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os.remove(self.dest_path)
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def get_flow(**kwargs):
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"""Return task flow for no-op.
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:param context: request context
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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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:param image_id: Image ID
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"""
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context = kwargs.get('context')
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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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image_id = kwargs.get('image_id')
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return lf.Flow(task_type).add(
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_ConvertImage(context, task_id, task_type,
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image_repo, image_id),
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)
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