Revision f5174d2c image_creator/disk.py
b/image_creator/disk.py | ||
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# or implied, of GRNET S.A. |
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|
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from image_creator.util import get_command |
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from image_creator.util import FatalError |
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from image_creator.util import try_fail_repeat |
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from image_creator.util import free_space |
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from image_creator.gpt import GPTPartitionTable
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from image_creator.util import FatalError
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from image_creator.bundle_volume import BundleVolume |
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from image_creator.image import Image |
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import stat |
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import os |
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import tempfile |
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import uuid |
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import re |
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import guestfs |
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import shutil |
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from sendfile import sendfile |
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dd = get_command('dd') |
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dmsetup = get_command('dmsetup') |
... | ... | |
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media can be an image file, a block device or a directory. |
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""" |
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self._cleanup_jobs = [] |
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self._devices = []
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self._images = []
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self.source = source |
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self.out = output |
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self.meta = {} |
... | ... | |
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program ends. |
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""" |
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try: |
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while len(self._devices):
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device = self._devices.pop()
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device.destroy()
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while len(self._images):
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image = self._images.pop()
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image.destroy()
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finally: |
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# Make sure those are executed even if one of the device.destroy |
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# methods throws exeptions. |
... | ... | |
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self.out.success('done') |
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return "/dev/mapper/%s" % snapshot |
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def get_device(self, media):
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"""Returns a newly created DiskDevice instance."""
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def get_image(self, media):
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"""Returns a newly created ImageCreator instance."""
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new_device = DiskDevice(media, self.out)
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self._devices.append(new_device)
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new_device.enable()
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return new_device
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image = Image(media, self.out)
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self._images.append(image)
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image.enable()
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return image
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def destroy_device(self, device):
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"""Destroys a DiskDevice instance previously created by
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get_device method.
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def destroy_image(self, image):
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"""Destroys an ImageCreator instance previously created by
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get_image_creator method.
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""" |
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self._devices.remove(device) |
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device.destroy() |
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class DiskDevice(object): |
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"""This class represents a block device hosting an Operating System |
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as created by the device-mapper. |
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""" |
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def __init__(self, device, output, bootable=True, meta={}): |
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"""Create a new DiskDevice.""" |
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self.real_device = device |
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self.out = output |
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self.bootable = bootable |
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self.meta = meta |
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self.progress_bar = None |
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self.guestfs_device = None |
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self.size = 0 |
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self.g = guestfs.GuestFS() |
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self.g.add_drive_opts(self.real_device, readonly=0, format="raw") |
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# Before version 1.17.14 the recovery process, which is a fork of the |
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# original process that called libguestfs, did not close its inherited |
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# file descriptors. This can cause problems especially if the parent |
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# process has opened pipes. Since the recovery process is an optional |
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# feature of libguestfs, it's better to disable it. |
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self.g.set_recovery_proc(0) |
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version = self.g.version() |
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if version['major'] > 1 or \ |
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(version['major'] == 1 and (version['minor'] >= 18 or |
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(version['minor'] == 17 and |
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version['release'] >= 14))): |
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self.g.set_recovery_proc(1) |
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self.out.output("Enabling recovery proc") |
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#self.g.set_trace(1) |
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#self.g.set_verbose(1) |
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self.guestfs_enabled = False |
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def enable(self): |
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"""Enable a newly created DiskDevice""" |
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self.out.output('Launching helper VM (may take a while) ...', False) |
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# self.progressbar = self.out.Progress(100, "Launching helper VM", |
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# "percent") |
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# eh = self.g.set_event_callback(self.progress_callback, |
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# guestfs.EVENT_PROGRESS) |
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self.g.launch() |
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self.guestfs_enabled = True |
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# self.g.delete_event_callback(eh) |
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# self.progressbar.success('done') |
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# self.progressbar = None |
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self.out.success('done') |
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self.out.output('Inspecting Operating System ...', False) |
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roots = self.g.inspect_os() |
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if len(roots) == 0: |
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raise FatalError("No operating system found") |
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if len(roots) > 1: |
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raise FatalError("Multiple operating systems found." |
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"We only support images with one OS.") |
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self.root = roots[0] |
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self.guestfs_device = self.g.part_to_dev(self.root) |
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self.size = self.g.blockdev_getsize64(self.guestfs_device) |
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self.meta['PARTITION_TABLE'] = \ |
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self.g.part_get_parttype(self.guestfs_device) |
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self.ostype = self.g.inspect_get_type(self.root) |
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self.distro = self.g.inspect_get_distro(self.root) |
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self.out.success('found a(n) %s system' % self.distro) |
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def destroy(self): |
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"""Destroy this DiskDevice instance.""" |
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# In new guestfs versions, there is a handy shutdown method for this |
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try: |
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if self.guestfs_enabled: |
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self.g.umount_all() |
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self.g.sync() |
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finally: |
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# Close the guestfs handler if open |
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self.g.close() |
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# def progress_callback(self, ev, eh, buf, array): |
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# position = array[2] |
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# total = array[3] |
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# |
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# self.progressbar.goto((position * 100) // total) |
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def mount(self, readonly=False): |
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"""Mount all disk partitions in a correct order.""" |
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mount = self.g.mount_ro if readonly else self.g.mount |
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msg = " read-only" if readonly else "" |
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self.out.output("Mounting the media%s ..." % msg, False) |
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mps = self.g.inspect_get_mountpoints(self.root) |
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# Sort the keys to mount the fs in a correct order. |
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# / should be mounted befor /boot, etc |
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def compare(a, b): |
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if len(a[0]) > len(b[0]): |
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return 1 |
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elif len(a[0]) == len(b[0]): |
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return 0 |
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else: |
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return -1 |
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mps.sort(compare) |
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for mp, dev in mps: |
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try: |
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mount(dev, mp) |
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except RuntimeError as msg: |
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self.out.warn("%s (ignored)" % msg) |
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self.out.success("done") |
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def umount(self): |
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"""Umount all mounted filesystems.""" |
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self.g.umount_all() |
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def _last_partition(self): |
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if self.meta['PARTITION_TABLE'] not in 'msdos' 'gpt': |
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msg = "Unsupported partition table: %s. Only msdos and gpt " \ |
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"partition tables are supported" % self.meta['PARTITION_TABLE'] |
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raise FatalError(msg) |
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is_extended = lambda p: \ |
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self.g.part_get_mbr_id(self.guestfs_device, p['part_num']) \ |
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in (0x5, 0xf) |
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is_logical = lambda p: \ |
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self.meta['PARTITION_TABLE'] == 'msdos' and p['part_num'] > 4 |
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partitions = self.g.part_list(self.guestfs_device) |
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last_partition = partitions[-1] |
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if is_logical(last_partition): |
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# The disk contains extended and logical partitions.... |
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extended = filter(is_extended, partitions)[0] |
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last_primary = [p for p in partitions if p['part_num'] <= 4][-1] |
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# check if extended is the last primary partition |
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if last_primary['part_num'] > extended['part_num']: |
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last_partition = last_primary |
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return last_partition |
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def shrink(self): |
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"""Shrink the disk. |
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This is accomplished by shrinking the last filesystem in the |
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disk and then updating the partition table. The new disk size |
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(in bytes) is returned. |
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ATTENTION: make sure unmount is called before shrink |
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""" |
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get_fstype = lambda p: \ |
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self.g.vfs_type("%s%d" % (self.guestfs_device, p['part_num'])) |
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is_logical = lambda p: \ |
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self.meta['PARTITION_TABLE'] == 'msdos' and p['part_num'] > 4 |
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is_extended = lambda p: \ |
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self.meta['PARTITION_TABLE'] == 'msdos' and \ |
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self.g.part_get_mbr_id(self.guestfs_device, p['part_num']) \ |
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in (0x5, 0xf) |
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part_add = lambda ptype, start, stop: \ |
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self.g.part_add(self.guestfs_device, ptype, start, stop) |
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part_del = lambda p: self.g.part_del(self.guestfs_device, p) |
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part_get_id = lambda p: self.g.part_get_mbr_id(self.guestfs_device, p) |
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part_set_id = lambda p, id: \ |
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self.g.part_set_mbr_id(self.guestfs_device, p, id) |
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part_get_bootable = lambda p: \ |
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self.g.part_get_bootable(self.guestfs_device, p) |
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part_set_bootable = lambda p, bootable: \ |
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self.g.part_set_bootable(self.guestfs_device, p, bootable) |
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MB = 2 ** 20 |
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self.out.output("Shrinking image (this may take a while) ...", False) |
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sector_size = self.g.blockdev_getss(self.guestfs_device) |
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last_part = None |
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fstype = None |
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while True: |
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last_part = self._last_partition() |
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fstype = get_fstype(last_part) |
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if fstype == 'swap': |
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self.meta['SWAP'] = "%d:%s" % \ |
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(last_part['part_num'], |
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(last_part['part_size'] + MB - 1) // MB) |
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part_del(last_part['part_num']) |
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continue |
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elif is_extended(last_part): |
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part_del(last_part['part_num']) |
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continue |
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|
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# Most disk manipulation programs leave 2048 sectors after the last |
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# partition |
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new_size = last_part['part_end'] + 1 + 2048 * sector_size |
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self.size = min(self.size, new_size) |
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break |
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|
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if not re.match("ext[234]", fstype): |
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self.out.warn("Don't know how to resize %s partitions." % fstype) |
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return self.size |
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part_dev = "%s%d" % (self.guestfs_device, last_part['part_num']) |
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self.g.e2fsck_f(part_dev) |
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self.g.resize2fs_M(part_dev) |
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out = self.g.tune2fs_l(part_dev) |
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block_size = int(filter(lambda x: x[0] == 'Block size', out)[0][1]) |
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block_cnt = int(filter(lambda x: x[0] == 'Block count', out)[0][1]) |
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start = last_part['part_start'] / sector_size |
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end = start + (block_size * block_cnt) / sector_size - 1 |
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if is_logical(last_part): |
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partitions = self.g.part_list(self.guestfs_device) |
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logical = [] # logical partitions |
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for partition in partitions: |
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if partition['part_num'] < 4: |
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continue |
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logical.append({ |
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'num': partition['part_num'], |
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'start': partition['part_start'] / sector_size, |
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'end': partition['part_end'] / sector_size, |
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'id': part_get_id(partition['part_num']), |
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'bootable': part_get_bootable(partition['part_num']) |
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}) |
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|
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logical[-1]['end'] = end # new end after resize |
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|
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# Recreate the extended partition |
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extended = filter(is_extended, partitions)[0] |
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part_del(extended['part_num']) |
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part_add('e', extended['part_start'] / sector_size, end) |
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|
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# Create all the logical partitions back |
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for l in logical: |
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part_add('l', l['start'], l['end']) |
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part_set_id(l['num'], l['id']) |
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part_set_bootable(l['num'], l['bootable']) |
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else: |
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# Recreate the last partition |
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if self.meta['PARTITION_TABLE'] == 'msdos': |
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last_part['id'] = part_get_id(last_part['part_num']) |
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|
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last_part['bootable'] = part_get_bootable(last_part['part_num']) |
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part_del(last_part['part_num']) |
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part_add('p', start, end) |
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part_set_bootable(last_part['part_num'], last_part['bootable']) |
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|
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if self.meta['PARTITION_TABLE'] == 'msdos': |
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part_set_id(last_part['part_num'], last_part['id']) |
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|
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new_size = (end + 1) * sector_size |
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assert (new_size <= self.size) |
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if self.meta['PARTITION_TABLE'] == 'gpt': |
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ptable = GPTPartitionTable(self.real_device) |
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self.size = ptable.shrink(new_size, self.size) |
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else: |
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self.size = min(new_size + 2048 * sector_size, self.size) |
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459 |
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self.out.success("new size is %dMB" % ((self.size + MB - 1) // MB)) |
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|
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return self.size |
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|
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def dump(self, outfile): |
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"""Dumps the content of device into a file. |
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|
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This method will only dump the actual payload, found by reading the |
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partition table. Empty space in the end of the device will be ignored. |
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""" |
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MB = 2 ** 20 |
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blocksize = 4 * MB # 4MB |
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size = self.size |
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progr_size = (size + MB - 1) // MB # in MB |
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progressbar = self.out.Progress(progr_size, "Dumping image file", 'mb') |
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475 |
|
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with open(self.real_device, 'r') as src: |
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with open(outfile, "w") as dst: |
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left = size |
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offset = 0 |
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progressbar.next() |
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481 |
while left > 0: |
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482 |
length = min(left, blocksize) |
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483 |
sent = sendfile(dst.fileno(), src.fileno(), offset, length) |
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484 |
|
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485 |
# Workaround for python-sendfile API change. In |
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486 |
# python-sendfile 1.2.x (py-sendfile) the returning value |
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487 |
# of sendfile is a tuple, where in version 2.x (pysendfile) |
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488 |
# it is just a sigle integer. |
|
489 |
if isinstance(sent, tuple): |
|
490 |
sent = sent[1] |
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491 |
|
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492 |
offset += sent |
|
493 |
left -= sent |
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494 |
progressbar.goto((size - left) // MB) |
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495 |
progressbar.success('image file %s was successfully created' % outfile) |
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187 |
self._images.remove(image) |
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188 |
image.destroy() |
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496 | 189 |
|
497 | 190 |
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |
Also available in: Unified diff