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d03cbac796
Used truncate instead of dd to create wic images for the following reasons: - dd doesn't preserve sparseness - truncate syntax is much more clear - dd requires additional calculations of the image size in blocks - the way dd was used in the code is not always correct. In some cases it was writing one block to the file which makes it not 100% sparse. [YOCTO #9099] (From OE-Core rev: d2d0d18dfd3922411d856b98ab6ba5d64c9c1c9f) Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
#!/usr/bin/env python -tt
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#
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# Copyright (c) 2007, Red Hat, Inc.
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# Copyright (c) 2009, 2010, 2011 Intel, Inc.
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation; version 2 of the License
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc., 59
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# Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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from __future__ import with_statement
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import os
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import errno
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from wic.utils.oe.misc import exec_cmd
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def makedirs(dirname):
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"""A version of os.makedirs() that doesn't throw an
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exception if the leaf directory already exists.
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"""
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try:
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os.makedirs(dirname)
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except OSError, err:
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if err.errno != errno.EEXIST:
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raise
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class Disk:
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"""
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Generic base object for a disk.
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"""
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def __init__(self, size, device=None):
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self._device = device
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self._size = size
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def create(self):
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pass
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def cleanup(self):
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pass
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def get_device(self):
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return self._device
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def set_device(self, path):
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self._device = path
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device = property(get_device, set_device)
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def get_size(self):
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return self._size
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size = property(get_size)
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class DiskImage(Disk):
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"""
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A Disk backed by a file.
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"""
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def __init__(self, image_file, size):
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Disk.__init__(self, size)
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self.image_file = image_file
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def exists(self):
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return os.path.exists(self.image_file)
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def create(self):
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if self.device is not None:
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return
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# create sparse disk image
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cmd = "truncate %s -s %s" % (self.image_file, self.size)
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exec_cmd(cmd)
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self.device = self.image_file
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