./0000755000175000017500000000000011602667011011035 5ustar henrichhenrich./setup.py0000644000175000017500000000017011602667011012545 0ustar henrichhenrichfrom distutils.core import setup setup(name='VMDKstream', version='0.2', py_modules=['VMDKstream'], ) ./README0000644000175000017500000000110011602667011011705 0ustar henrichhenrichWhile adding support for VMWare ESX/vSphere to the Image Factory project we discovered that we needed to support the "stream-optimized" variant of VMDK. This module is a first draft attempt to do so. It is known to work on ESXi 4.1. This format is only useful if you are attempting to import virtual machines into ESX using the vSphere SOAP API and HTTP POST uploads of image files. (In which case, it is required.) More details about the Image Factory and the rest of the aeolus project can be found here: http://www.aeolusproject.org/ -Ian McLeod ./COPYING0000644000175000017500000004325411602667011012100 0ustar henrichhenrich GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. ./VMDKstream.py0000755000175000017500000002627611602667011013404 0ustar henrichhenrich#!/usr/bin/env python # encoding: utf-8 # Copyright (C) 2011 Red Hat, Inc. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; version 2 of the License. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, # MA 02110-1301, USA. A copy of the GNU General Public License is # also available at http://www.gnu.org/copyleft/gpl.html. # # First cut module to convert raw disk images into stream-optimized VMDK files # # See the "Specification Document" referenced in Wikipedia for more details: # # http://en.wikipedia.org/wiki/VMDK # # Divergence from spec noted below # # The stream-optimized format is required for importing images via the vSphere # SOAP API import struct import sys import os import math import string import zlib class VMDKStreamException(Exception): def __init__(self, msg): self.msg = msg def __str__(self): return self.msg # Header Constants MAGIC_NUMBER = 0x564D444B # 'V' 'M' 'D' 'K' # Marker Constants MARKER_EOS = 0 # end of stream MARKER_GT = 1 # grain table MARKER_GD = 2 # grain directory MARKER_FOOTER = 3 # footer (repeat of header with final info) # Other Constants SECTOR_SIZE = 512 # Descriptor Template image_descriptor_template='''# Description file created by VMDK stream converter version=1 # Believe this is random CID=7e5b80a7 # Indicates no parent parentCID=ffffffff createType="streamOptimized" # Extent description RDONLY #SECTORS# SPARSE "call-me-stream.vmdk" # The Disk Data Base #DDB ddb.adapterType = "lsilogic" # #SECTORS# / 63 / 255 rounded up ddb.geometry.cylinders = "#CYLINDERS#" ddb.geometry.heads = "255" ddb.geometry.sectors = "63" # Believe this is random ddb.longContentID = "8f15b3d0009d9a3f456ff7b28d324d2a" ddb.virtualHWVersion = "7"''' def create_sparse_header(inFileSectors, descriptorSize, gdOffset = 0xFFFFFFFFFFFFFFFF): # While theoretically variable we set these based on current VMWare # convention grainSize = 128 numGTEsPerGT = 512 overHead = 128 formatVersion = 3 # NOTE: Conflicts with VMWare docs - determined by trial/error descriptorOffset = 1 # The following are always fixed in the "stream-optimized" format we are # creating compressAlgorithm = 1 flags = 0x30001 rgdOffset = 0 # We are building from scratch so an unclean shutdown is not possible uncleanShutdown = 0 # Build the struct header_list = [ MAGIC_NUMBER, formatVersion, flags, inFileSectors, grainSize, descriptorOffset, descriptorSize, numGTEsPerGT, rgdOffset, gdOffset, overHead, uncleanShutdown, '\n', ' ', '\r', '\n', compressAlgorithm ] for i in range(433): header_list.append(0) header_struct = "=IIIQQQQIQQQBccccH433B" return struct.pack(header_struct, *header_list) def create_marker(numSectors, size, marker_type): marker_list = [ numSectors, size, marker_type ] for i in range(496): marker_list.append(0) marker_struct = "=QII496B" return struct.pack(marker_struct, *marker_list) def create_grain_marker(location, size): # The grain marker is special in that the data follows immediately after it # without a pad return struct.pack("=QI", location, size) def divro(num, den): # Divide always rounding up and returning an integer # Is there some nicer way to do this? return int(math.ceil((1.0*num)/(1.0*den))) def pad_to_sector(stringlen): # create a pad that, when concated onto a string of stringlen # makes it an integer number of sectors # return pad and length of input_string + pad in sectors pad = "" if stringlen % SECTOR_SIZE: # This does need padding for i in range(SECTOR_SIZE - (stringlen % SECTOR_SIZE)): pad += '\0' finallen = (stringlen + len(pad))/SECTOR_SIZE return pad, finallen def sector_pointer(file_object): # return file point in sectors # raise an exception if not sector aligned file_location = file_object.tell() if file_location % SECTOR_SIZE: raise VMDKStreamException("Asked for a sector pointer on a file whose r/w pointer is not sector aligned") else: return file_location / SECTOR_SIZE def write_grain_table(outfile, grain_table, gtes_per_gt = 512): # Write grain_table to outfile including header # return the sector on which the table starts zero_grain_table = [ ] for i in range(gtes_per_gt): zero_grain_table.append(0) if grain_table == zero_grain_table: # We don't need to write this and can put zeros in the directory return 0 else: grain_table_marker = create_marker(numSectors = (gtes_per_gt * 4) / SECTOR_SIZE, size = 0, marker_type = MARKER_GT) outfile.write(grain_table_marker) table_location = sector_pointer(outfile) outfile.write(struct.pack("%dI" % gtes_per_gt, *grain_table)) return table_location def debug_print(message): #print message pass def convert_to_stream(infilename, outfilename): debug_print("DEBUG: opening %s to write to %s" % (infilename, outfilename)) infileSize = os.path.getsize(infilename) infileSectors = divro(infileSize, 512) debug_print("DEBUG: input file is (%s) bytes - (%s) sectors long" % (infileSize, infileSectors)) # Fixed by convention # TODO: Make variable here and in header fuction grainSectors=128 totalGrains=divro(infileSectors, grainSectors) debug_print("DEBUG: total grains will be (%s)" % (totalGrains)) # Fixed by convention # TODO: Make variable here and in header fuction numGTEsPerGT = 512 totalGrainTables=divro(totalGrains, numGTEsPerGT) debug_print("DEBUG: total Grain Tables needed will be (%s)" % (totalGrainTables)) grainDirectorySectors=divro(totalGrainTables*4, SECTOR_SIZE) debug_print("DEBUG: sectors in Grain Directory will be (%s)" % (grainDirectorySectors)) grainDirectoryEntries=grainDirectorySectors*128 debug_print("DEBUG: Number of entries in Grain Directory - (%s)" % (grainDirectoryEntries)) infileCylinders=divro(infileSectors, (63*255)) debug_print("DEBUG: Cylinders (%s)" % infileCylinders) # Populate descriptor tmpl = image_descriptor_template tmpl = string.replace(tmpl, "#SECTORS#", str(infileSectors)) tmpl = string.replace(tmpl, "#CYLINDERS#", str(infileCylinders)) image_descriptor = tmpl image_descriptor_pad, desc_sectors = pad_to_sector(len(image_descriptor)) debug_print("DEBUG: Descriptor takes up (%s) sectors" % desc_sectors) image_descriptor += image_descriptor_pad image_header = create_sparse_header(inFileSectors = infileSectors, descriptorSize = desc_sectors) outfile = open(outfilename, "wb") outfile.write(image_header) outfile.write(image_descriptor) # Fixed by convention # TODO: Make variable here and in header function overHead = 128 # Pad the output file to fill the overHead for i in range((overHead-sector_pointer(outfile)) * SECTOR_SIZE): outfile.write('\0') # grainDirectory - list of integers representing the global level 0 grain # directory grainDirectory = [ ] # currentGrainTable - list that can grow to numGTEsPerGT integers # representing the active grain table currentGrainTable = [ ] # For slightly more efficient comparison grainSize = grainSectors * SECTOR_SIZE zeroChunk = "" for i in range(grainSize): zeroChunk += '\0' # We are ready to start reading infile = open(infilename, "rb") try: inputSectorPointer = sector_pointer(infile) inChunk = infile.read(grainSize) while inChunk != "": if inChunk == zeroChunk: # All zeros - no need to create a grain - just mark zero in GTE currentGrainTable.append(0) else: # Create a compressed grain currentGrainTable.append(sector_pointer(outfile)) compChunk = zlib.compress(inChunk) grain_marker = create_grain_marker(inputSectorPointer, len(compChunk)) grainPad, writeSectors = pad_to_sector(len(compChunk) + len(grain_marker)) outfile.write(grain_marker) outfile.write(compChunk) outfile.write(grainPad) if len(currentGrainTable) == numGTEsPerGT: # Table is full table_location = write_grain_table(outfile, currentGrainTable, gtes_per_gt = numGTEsPerGT) # function does zero check so we don't have to grainDirectory.append(table_location) currentGrainTable = [ ] # do not update pointer unless we read a full grain last time # incomplete grain read indicates EOF and may result in non-sector # alignment if len(inChunk) == grainSize: inputSectorPointer = sector_pointer(infile) # read the next chunk inChunk = infile.read(grainSize) finally: # Write out the final grain table if needed if len(currentGrainTable): debug_print("Partial grain table present - padding and adding it to dir") for i in range(numGTEsPerGT-len(currentGrainTable)): currentGrainTable.append(0) table_location = write_grain_table(outfile, currentGrainTable, gtes_per_gt = numGTEsPerGT) grainDirectory.append(table_location) else: debug_print("Current grain table is empty so we need not write it out") # pad out grain directory then write it for i in range(grainDirectoryEntries - totalGrainTables): grainDirectory.append(0) grain_directory_marker = create_marker(grainDirectorySectors, 0, MARKER_GD) outfile.write(grain_directory_marker) gdLocation = sector_pointer(outfile) grainDirectoryStruct = "%dI" % grainDirectoryEntries debug_print("Grain directory length (%d)" % (len(grainDirectory))) debug_print("Grain directory: ") debug_print(grainDirectory) outfile.write(struct.pack(grainDirectoryStruct, *grainDirectory)) # footer marker outfile.write(create_marker(1, 0, MARKER_FOOTER)) # footer footer = create_sparse_header(inFileSectors = infileSectors, descriptorSize = desc_sectors, gdOffset = gdLocation) outfile.write(footer) # EOS marker outfile.write(create_marker(0, 0, MARKER_EOS)) outfile.close() infile.close() if __name__ == '__main__': convert_to_stream(sys.argv[1], sys.argv[2])