#!/usr/bin/env python
-import losetup
+from image_creator.util import get_command
+from image_creator import FatalError
+from clint.textui import progress
+
import stat
import os
import tempfile
import re
import sys
import guestfs
-
-from pbs import dmsetup
-from pbs import blockdev
-from pbs import dd
+import time
class DiskError(Exception):
pass
+dd = get_command('dd')
+dmsetup = get_command('dmsetup')
+losetup = get_command('losetup')
+blockdev = get_command('blockdev')
+
class Disk(object):
"""This class represents a hard disk hosting an Operating System
self._cleanup_jobs.append((job, args))
def _losetup(self, fname):
- loop = losetup.find_unused_loop_device()
- loop.mount(fname)
- self._add_cleanup(loop.unmount)
- return loop.device
+ loop = losetup('-f', '--show', fname)
+ loop = loop.strip() # remove the new-line char
+ self._add_cleanup(losetup, '-d', loop)
+ return loop
def _dir_to_disk(self):
raise NotImplementedError
# Take a snapshot and return it to the user
size = blockdev('--getsize', sourcedev)
cowfd, cow = tempfile.mkstemp()
+ os.close(cowfd)
self._add_cleanup(os.unlink, cow)
# Create 1G cow sparse file
dd('if=/dev/null', 'of=%s' % cow, 'bs=1k', 'seek=%d' % (1024 * 1024))
self._add_cleanup(dmsetup, 'remove', snapshot)
finally:
os.unlink(table)
-
new_device = DiskDevice("/dev/mapper/%s" % snapshot)
self._devices.append(new_device)
+ new_device.enable()
return new_device
def destroy_device(self, device):
device.destroy()
+def progress_generator(label=''):
+ position = 0;
+ for i in progress.bar(range(100),label):
+ if i < position:
+ continue
+ position = yield
+ yield #suppress the StopIteration exception
+
+
class DiskDevice(object):
"""This class represents a block device hosting an Operating System
as created by the device-mapper.
def __init__(self, device, bootable=True):
"""Create a new DiskDevice."""
+
self.device = device
self.bootable = bootable
+ self.progress_bar = None
self.g = guestfs.GuestFS()
+ self.g.add_drive_opts(self.device, readonly=0)
- self.g.set_trace(1)
+ #self.g.set_trace(1)
+ #self.g.set_verbose(1)
- self.g.add_drive_opts(device, readonly=0)
+ self.guestfs_enabled = False
+
+ def enable(self):
+ """Enable a newly created DiskDevice"""
+
+ self.progressbar = progress_generator("VM lauch: ")
+ self.progressbar.next()
+ eh = self.g.set_event_callback(self.progress_callback, guestfs.EVENT_PROGRESS)
self.g.launch()
+ self.guestfs_enabled = True
+ self.g.delete_event_callback(eh)
+ if self.progressbar is not None:
+ self.progressbar.send(100)
+ self.progressbar = None
+
roots = self.g.inspect_os()
if len(roots) == 0:
- raise DiskError("No operating system found")
+ raise FatalError("No operating system found")
if len(roots) > 1:
- raise DiskError("Multiple operating systems found")
+ raise FatalError("Multiple operating systems found")
self.root = roots[0]
self.ostype = self.g.inspect_get_type(self.root)
def destroy(self):
"""Destroy this DiskDevice instance."""
- self.g.umount_all()
- self.g.sync()
- # Close the guestfs handler
+
+ if self.guestfs_enabled:
+ self.g.umount_all()
+ self.g.sync()
+
+ # Close the guestfs handler if open
self.g.close()
+ def progress_callback(self, ev, eh, buf, array):
+ position = array[2]
+ total = array[3]
+
+ self.progressbar.send((position * 100)//total)
+
+ if position == total:
+ self.progressbar = None
+
def mount(self):
"""Mount all disk partitions in a correct order."""
mps = self.g.inspect_get_mountpoints(self.root)
dev = self.g.part_to_dev(self.root)
parttype = self.g.part_get_parttype(dev)
if parttype != 'msdos':
- raise DiskError("You have a %s partition table. "
+ raise FatalError("You have a %s partition table. "
"Only msdos partitions are supported" % parttype)
last_partition = self.g.part_list(dev)[-1]
if last_partition['part_num'] > 4:
- raise DiskError("This disk contains logical partitions. "
+ raise FatalError("This disk contains logical partitions. "
"Only primary partitions are supported.")
part_dev = "%s%d" % (dev, last_partition['part_num'])