236 lines
8.9 KiB
Python
236 lines
8.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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# Copyright (c) 2010 Citrix Systems, Inc.
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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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"""
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Handling of VM disk images.
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"""
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import os
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import re
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from nova import exception
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from nova.image import glance
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from nova.openstack.common import cfg
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from nova.openstack.common import log as logging
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from nova import utils
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LOG = logging.getLogger(__name__)
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image_opts = [
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cfg.BoolOpt('force_raw_images',
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default=True,
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help='Force backing images to raw format'),
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]
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CONF = cfg.CONF
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CONF.register_opts(image_opts)
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class QemuImgInfo(object):
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BACKING_FILE_RE = re.compile((r"^(.*?)\s*\(actual\s+path\s*:"
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r"\s+(.*?)\)\s*$"), re.I)
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TOP_LEVEL_RE = re.compile(r"^([\w\d\s\_\-]+):(.*)$")
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SIZE_RE = re.compile(r"\(\s*(\d+)\s+bytes\s*\)", re.I)
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def __init__(self, cmd_output):
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details = self._parse(cmd_output)
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self.image = details.get('image')
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self.backing_file = details.get('backing_file')
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self.file_format = details.get('file_format')
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self.virtual_size = details.get('virtual_size')
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self.cluster_size = details.get('cluster_size')
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self.disk_size = details.get('disk_size')
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self.snapshots = details.get('snapshot_list', [])
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self.encryption = details.get('encryption')
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def __str__(self):
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lines = [
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'image: %s' % self.image,
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'file_format: %s' % self.file_format,
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'virtual_size: %s' % self.virtual_size,
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'disk_size: %s' % self.disk_size,
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'cluster_size: %s' % self.cluster_size,
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'backing_file: %s' % self.backing_file,
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]
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if self.snapshots:
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lines.append("snapshots: %s" % self.snapshots)
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return "\n".join(lines)
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def _canonicalize(self, field):
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# Standardize on underscores/lc/no dash and no spaces
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# since qemu seems to have mixed outputs here... and
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# this format allows for better integration with python
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# - ie for usage in kwargs and such...
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field = field.lower().strip()
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for c in (" ", "-"):
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field = field.replace(c, '_')
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return field
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def _extract_bytes(self, details):
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# Replace it with the byte amount
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real_size = self.SIZE_RE.search(details)
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if real_size:
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details = real_size.group(1)
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try:
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details = utils.to_bytes(details)
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except (TypeError, ValueError):
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pass
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return details
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def _extract_details(self, root_cmd, root_details, lines_after):
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consumed_lines = 0
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real_details = root_details
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if root_cmd == 'backing_file':
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# Replace it with the real backing file
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backing_match = self.BACKING_FILE_RE.match(root_details)
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if backing_match:
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real_details = backing_match.group(2).strip()
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elif root_cmd in ['virtual_size', 'cluster_size', 'disk_size']:
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# Replace it with the byte amount (if we can convert it)
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real_details = self._extract_bytes(root_details)
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elif root_cmd == 'file_format':
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real_details = real_details.strip().lower()
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elif root_cmd == 'snapshot_list':
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# Next line should be a header, starting with 'ID'
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if not lines_after or not lines_after[0].startswith("ID"):
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msg = _("Snapshot list encountered but no header found!")
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raise ValueError(msg)
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consumed_lines += 1
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possible_contents = lines_after[1:]
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real_details = []
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# This is the sprintf pattern we will try to match
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# "%-10s%-20s%7s%20s%15s"
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# ID TAG VM SIZE DATE VM CLOCK (current header)
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for line in possible_contents:
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line_pieces = line.split(None)
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if len(line_pieces) != 6:
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break
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else:
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# Check against this pattern occuring in the final position
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# "%02d:%02d:%02d.%03d"
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date_pieces = line_pieces[5].split(":")
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if len(date_pieces) != 3:
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break
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real_details.append({
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'id': line_pieces[0],
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'tag': line_pieces[1],
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'vm_size': line_pieces[2],
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'date': line_pieces[3],
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'vm_clock': line_pieces[4] + " " + line_pieces[5],
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})
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consumed_lines += 1
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return (real_details, consumed_lines)
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def _parse(self, cmd_output):
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# Analysis done of qemu-img.c to figure out what is going on here
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# Find all points start with some chars and then a ':' then a newline
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# and then handle the results of those 'top level' items in a separate
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# function.
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#
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# TODO(harlowja): newer versions might have a json output format
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# we should switch to that whenever possible.
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# see: http://bit.ly/XLJXDX
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if not cmd_output:
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cmd_output = ''
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contents = {}
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lines = cmd_output.splitlines()
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i = 0
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line_am = len(lines)
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while i < line_am:
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line = lines[i]
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if not line.strip():
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i += 1
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continue
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consumed_lines = 0
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top_level = self.TOP_LEVEL_RE.match(line)
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if top_level:
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root = self._canonicalize(top_level.group(1))
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if not root:
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i += 1
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continue
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root_details = top_level.group(2).strip()
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details, consumed_lines = self._extract_details(root,
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root_details,
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lines[i + 1:])
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contents[root] = details
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i += consumed_lines + 1
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return contents
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def qemu_img_info(path):
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"""Return a object containing the parsed output from qemu-img info."""
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out, err = utils.execute('env', 'LC_ALL=C', 'LANG=C',
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'qemu-img', 'info', path)
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return QemuImgInfo(out)
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def convert_image(source, dest, out_format):
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"""Convert image to other format."""
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cmd = ('qemu-img', 'convert', '-O', out_format, source, dest)
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utils.execute(*cmd)
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def fetch(context, image_href, path, _user_id, _project_id):
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# TODO(vish): Improve context handling and add owner and auth data
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# when it is added to glance. Right now there is no
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# auth checking in glance, so we assume that access was
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# checked before we got here.
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(image_service, image_id) = glance.get_remote_image_service(context,
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image_href)
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with utils.remove_path_on_error(path):
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with open(path, "wb") as image_file:
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image_service.download(context, image_id, image_file)
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def fetch_to_raw(context, image_href, path, user_id, project_id):
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path_tmp = "%s.part" % path
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fetch(context, image_href, path_tmp, user_id, project_id)
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with utils.remove_path_on_error(path_tmp):
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data = qemu_img_info(path_tmp)
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fmt = data.file_format
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if fmt is None:
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raise exception.ImageUnacceptable(
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reason=_("'qemu-img info' parsing failed."),
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image_id=image_href)
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backing_file = data.backing_file
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if backing_file is not None:
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raise exception.ImageUnacceptable(image_id=image_href,
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reason=_("fmt=%(fmt)s backed by: %(backing_file)s") % locals())
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if fmt != "raw" and CONF.force_raw_images:
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staged = "%s.converted" % path
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LOG.debug("%s was %s, converting to raw" % (image_href, fmt))
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with utils.remove_path_on_error(staged):
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convert_image(path_tmp, staged, 'raw')
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data = qemu_img_info(staged)
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if data.file_format != "raw":
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raise exception.ImageUnacceptable(image_id=image_href,
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reason=_("Converted to raw, but format is now %s") %
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data.file_format)
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os.rename(staged, path)
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else:
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os.rename(path_tmp, path)
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