diskimage-builder/diskimage_builder/block_device/level0/localloop.py
Andreas Florath ec7f56c1b2 Refactor: block-device handling (partitioning)
During the creation of a disk image (e.g. for a VM), there is the need
to create, setup, configure and afterwards detach some kind of storage
where the newly installed OS can be copied to or directly installed
in.

This patch implements partitioning handling.

Change-Id: I0ca6a4ae3a2684d473b44e5f332ee4225ee30f8c
Signed-off-by: Andreas Florath <andreas@florath.net>
2017-01-24 19:59:10 +00:00

131 lines
4.7 KiB
Python

# Copyright 2016 Andreas Florath (andreas@florath.net)
#
# 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.
from diskimage_builder.block_device.blockdevicesetupexception \
import BlockDeviceSetupException
from diskimage_builder.block_device.utils import parse_abs_size_spec
from diskimage_builder.graph.digraph import Digraph
import logging
import os
import subprocess
logger = logging.getLogger(__name__)
class LocalLoop(Digraph.Node):
"""Level0: Local loop image device handling.
This class handles local loop devices that can be used
for VM image installation.
"""
type_string = "local_loop"
def __init__(self, config, default_config):
logger.debug("Creating LocalLoop object; config [%s] "
"default_config [%s]" % (config, default_config))
if 'size' in config:
self.size = parse_abs_size_spec(config['size'])
logger.debug("Image size [%s]" % self.size)
else:
self.size = parse_abs_size_spec(default_config['image_size'])
logger.debug("Using default image size [%s]" % self.size)
if 'directory' in config:
self.image_dir = config['directory']
else:
self.image_dir = default_config['image_dir']
self.name = config['name']
Digraph.Node.__init__(self, self.name)
self.filename = os.path.join(self.image_dir, self.name + ".raw")
def insert_nodes(self, dg):
dg.add_node(self)
def insert_edges(self, dg):
"""Because this is created without base, there are no edges."""
pass
@staticmethod
def image_create(filename, size):
logger.info("Create image file [%s]" % filename)
with open(filename, "w") as fd:
fd.seek(size - 1)
fd.write("\0")
@staticmethod
def _image_delete(filename):
logger.info("Remove image file [%s]" % filename)
os.remove(filename)
@staticmethod
def _loopdev_attach(filename):
logger.info("loopdev attach")
logger.debug("Calling [sudo losetup --show -f %s]", filename)
subp = subprocess.Popen(["sudo", "losetup", "--show", "-f",
filename], stdout=subprocess.PIPE)
rval = subp.wait()
if rval == 0:
# [:-1]: Cut of the newline
block_device = subp.stdout.read()[:-1].decode("utf-8")
logger.info("New block device [%s]" % block_device)
return block_device
else:
logger.error("losetup failed")
raise BlockDeviceSetupException("losetup failed")
@staticmethod
def _loopdev_detach(loopdev):
logger.info("loopdev detach")
# loopback dev may be tied up a bit by udev events triggered
# by partition events
for try_cnt in range(10, 1, -1):
logger.debug("Calling [sudo losetup -d %s]", loopdev)
subp = subprocess.Popen(["sudo", "losetup", "-d",
loopdev])
rval = subp.wait()
if rval == 0:
logger.info("Successfully detached [%s]" % loopdev)
return 0
else:
logger.error("loopdev detach failed")
# Do not raise an error - maybe other cleanup methods
# can at least do some more work.
logger.debug("Gave up trying to detach [%s]" % loopdev)
return rval
def create(self, result, rollback):
logger.debug("[%s] Creating loop on [%s] with size [%d]" %
(self.name, self.filename, self.size))
rollback.append(lambda: self._image_delete(self.filename))
self.image_create(self.filename, self.size)
block_device = self._loopdev_attach(self.filename)
rollback.append(lambda: self._loopdev_detach(block_device))
result[self.name] = {"device": block_device,
"image": self.filename}
logger.debug("Created loop name [%s] device [%s] image [%s]"
% (self.name, block_device, self.filename))
return
def umount(self, state):
self._loopdev_detach(state[self.name]['device'])
def cleanup(self, state):
pass
def delete(self, state):
self._image_delete(state[self.name]['image'])