181 lines
7.5 KiB
Python
181 lines
7.5 KiB
Python
# Copyright 2010 United States Government as represented by the
|
|
# Administrator of the National Aeronautics and Space Administration.
|
|
# All Rights Reserved.
|
|
# Copyright (c) 2010 Citrix Systems, Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""
|
|
Helper methods to deal with images.
|
|
|
|
.. versionadded:: 3.1
|
|
|
|
.. versionchanged:: 3.14.0
|
|
add paramter format.
|
|
|
|
"""
|
|
|
|
import json
|
|
import re
|
|
|
|
from oslo_utils._i18n import _
|
|
from oslo_utils import strutils
|
|
|
|
|
|
class QemuImgInfo(object):
|
|
"""Parse Qemu image information from command `qemu-img info`'s output.
|
|
|
|
The instance of :class:`QemuImgInfo` has properties: `image`,
|
|
`backing_file`, `file_format`, `virtual_size`, `cluster_size`,
|
|
`disk_size`, `snapshots` and `encrypted`.
|
|
The parameter format can be set to 'json' or 'human'. With 'json' format
|
|
output, qemu image information will be parsed more easily and readable.
|
|
"""
|
|
BACKING_FILE_RE = re.compile((r"^(.*?)\s*\(actual\s+path\s*:"
|
|
r"\s+(.*?)\)\s*$"), re.I)
|
|
TOP_LEVEL_RE = re.compile(r"^([\w\d\s\_\-]+):(.*)$")
|
|
SIZE_RE = re.compile(r"(\d*\.?\d+)\s*(\w+)?(\s*\(\s*(\d+)\s+bytes\s*\))?",
|
|
re.I)
|
|
|
|
def __init__(self, cmd_output=None, format='human'):
|
|
if format == 'json':
|
|
details = json.loads(cmd_output or '{}')
|
|
self.image = details.get('filename')
|
|
self.backing_file = details.get('backing-filename')
|
|
self.file_format = details.get('format')
|
|
self.virtual_size = details.get('virtual-size')
|
|
self.cluster_size = details.get('cluster-size')
|
|
self.disk_size = details.get('actual-size')
|
|
self.snapshots = details.get('snapshots', [])
|
|
self.encrypted = details.get('encrypted')
|
|
else:
|
|
details = self._parse(cmd_output or '')
|
|
self.image = details.get('image')
|
|
self.backing_file = details.get('backing_file')
|
|
self.file_format = details.get('file_format')
|
|
self.virtual_size = details.get('virtual_size')
|
|
self.cluster_size = details.get('cluster_size')
|
|
self.disk_size = details.get('disk_size')
|
|
self.snapshots = details.get('snapshot_list', [])
|
|
self.encrypted = details.get('encrypted')
|
|
|
|
def __str__(self):
|
|
lines = [
|
|
'image: %s' % self.image,
|
|
'file_format: %s' % self.file_format,
|
|
'virtual_size: %s' % self.virtual_size,
|
|
'disk_size: %s' % self.disk_size,
|
|
'cluster_size: %s' % self.cluster_size,
|
|
'backing_file: %s' % self.backing_file,
|
|
]
|
|
if self.snapshots:
|
|
lines.append("snapshots: %s" % self.snapshots)
|
|
if self.encrypted:
|
|
lines.append("encrypted: %s" % self.encrypted)
|
|
return "\n".join(lines)
|
|
|
|
def _canonicalize(self, field):
|
|
# Standardize on underscores/lc/no dash and no spaces
|
|
# since qemu seems to have mixed outputs here... and
|
|
# this format allows for better integration with python
|
|
# - i.e. for usage in kwargs and such...
|
|
field = field.lower().strip()
|
|
for c in (" ", "-"):
|
|
field = field.replace(c, '_')
|
|
return field
|
|
|
|
def _extract_bytes(self, details):
|
|
# Replace it with the byte amount
|
|
real_size = self.SIZE_RE.search(details)
|
|
if not real_size:
|
|
raise ValueError(_('Invalid input value "%s".') % details)
|
|
magnitude = real_size.group(1)
|
|
unit_of_measure = real_size.group(2)
|
|
bytes_info = real_size.group(3)
|
|
if bytes_info:
|
|
return int(real_size.group(4))
|
|
elif not unit_of_measure:
|
|
return int(magnitude)
|
|
# Allow abbreviated unit such as K to mean KB for compatibility.
|
|
if len(unit_of_measure) == 1 and unit_of_measure != 'B':
|
|
unit_of_measure += 'B'
|
|
return strutils.string_to_bytes('%s%s' % (magnitude, unit_of_measure),
|
|
return_int=True)
|
|
|
|
def _extract_details(self, root_cmd, root_details, lines_after):
|
|
real_details = root_details
|
|
if root_cmd == 'backing_file':
|
|
# Replace it with the real backing file
|
|
backing_match = self.BACKING_FILE_RE.match(root_details)
|
|
if backing_match:
|
|
real_details = backing_match.group(2).strip()
|
|
elif root_cmd in ['virtual_size', 'cluster_size', 'disk_size']:
|
|
# Replace it with the byte amount (if we can convert it)
|
|
if root_details in ('None', 'unavailable'):
|
|
real_details = 0
|
|
else:
|
|
real_details = self._extract_bytes(root_details)
|
|
elif root_cmd == 'file_format':
|
|
real_details = real_details.strip().lower()
|
|
elif root_cmd == 'snapshot_list':
|
|
# Next line should be a header, starting with 'ID'
|
|
if not lines_after or not lines_after.pop(0).startswith("ID"):
|
|
msg = _("Snapshot list encountered but no header found!")
|
|
raise ValueError(msg)
|
|
real_details = []
|
|
# This is the sprintf pattern we will try to match
|
|
# "%-10s%-20s%7s%20s%15s"
|
|
# ID TAG VM SIZE DATE VM CLOCK (current header)
|
|
while lines_after:
|
|
line = lines_after[0]
|
|
line_pieces = line.split()
|
|
if len(line_pieces) != 6:
|
|
break
|
|
# Check against this pattern in the final position
|
|
# "%02d:%02d:%02d.%03d"
|
|
date_pieces = line_pieces[5].split(":")
|
|
if len(date_pieces) != 3:
|
|
break
|
|
lines_after.pop(0)
|
|
real_details.append({
|
|
'id': line_pieces[0],
|
|
'tag': line_pieces[1],
|
|
'vm_size': line_pieces[2],
|
|
'date': line_pieces[3],
|
|
'vm_clock': line_pieces[4] + " " + line_pieces[5],
|
|
})
|
|
return real_details
|
|
|
|
def _parse(self, cmd_output):
|
|
# Analysis done of qemu-img.c to figure out what is going on here
|
|
# Find all points start with some chars and then a ':' then a newline
|
|
# and then handle the results of those 'top level' items in a separate
|
|
# function.
|
|
#
|
|
# TODO(harlowja): newer versions might have a json output format
|
|
# we should switch to that whenever possible.
|
|
# see: http://bit.ly/XLJXDX
|
|
contents = {}
|
|
lines = [x for x in cmd_output.splitlines() if x.strip()]
|
|
while lines:
|
|
line = lines.pop(0)
|
|
top_level = self.TOP_LEVEL_RE.match(line)
|
|
if top_level:
|
|
root = self._canonicalize(top_level.group(1))
|
|
if not root:
|
|
continue
|
|
root_details = top_level.group(2).strip()
|
|
details = self._extract_details(root, root_details, lines)
|
|
contents[root] = details
|
|
return contents
|