+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.g = guestfs.GuestFS()
+
+ self.g.set_trace(1)
+
+ self.g.add_drive_opts(device, readonly=0)
+ self.g.launch()
+ roots = self.g.inspect_os()
+ if len(roots) == 0:
+ raise DiskError("No operating system found")
+ if len(roots) > 1:
+ raise DiskError("Multiple operating systems found")
+
+ self.root = roots[0]
+ self.ostype = self.g.inspect_get_type(self.root)
+ self.distro = self.g.inspect_get_distro(self.root)
+
+ def destroy(self):
+ """Destroy this DiskDevice instance."""
+ self.g.umount_all()
+ self.g.sync()
+ # Close the guestfs handler
+ self.g.close()
+
+ def mount(self):
+ """Mount all disk partitions in a correct order."""
+ mps = self.g.inspect_get_mountpoints(self.root)
+
+ # Sort the keys to mount the fs in a correct order.
+ # / should be mounted befor /boot, etc
+ def compare(a, b):
+ if len(a[0]) > len(b[0]):
+ return 1
+ elif len(a[0]) == len(b[0]):
+ return 0
+ else:
+ return -1
+ mps.sort(compare)
+ for mp, dev in mps:
+ try:
+ self.g.mount(dev, mp)
+ except RuntimeError as msg:
+ print "%s (ignored)" % msg
+
+ def umount(self):
+ """Umount all mounted filesystems."""
+ self.g.umount_all()
+
+ def shrink(self):
+ """Shrink the disk.
+
+ This is accomplished by shrinking the last filesystem in the
+ disk and then updating the partition table. The new disk size
+ (in bytes) is returned.
+ """
+ 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. "
+ "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. "
+ "Only primary partitions are supported.")
+
+ part_dev = "%s%d" % (dev, last_partition['part_num'])
+ fs_type = self.g.vfs_type(part_dev)
+ if not re.match("ext[234]", fs_type):
+ print "Warning: Don't know how to resize %s partitions." % vfs_type
+ return
+
+ self.g.e2fsck_f(part_dev)
+ self.g.resize2fs_M(part_dev)
+ output = self.g.tune2fs_l(part_dev)
+ block_size = int(filter(lambda x: x[0] == 'Block size', output)[0][1])
+ block_cnt = int(filter(lambda x: x[0] == 'Block count', output)[0][1])
+
+ sector_size = self.g.blockdev_getss(dev)
+
+ start = last_partition['part_start'] / sector_size
+ end = start + (block_size * block_cnt) / sector_size - 1
+
+ return (end + 1) * sector_size