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Contents
# encoding: US-ASCII
module VMWareDiskProbe
SPARSE_MAGIC = "KDMV"
SPARSE_MOD = "VMWareSparseDisk"
COWD_MAGIC = "COWD"
COWD_MOD = "VMWareCowdDisk"
DESC_MOD = "VMWareDescriptor"
def self.probe(ostruct)
return nil unless ostruct.fileName
# If not .vmdk then not VMWare.
# Allow .miq also.
ext = File.extname(ostruct.fileName).downcase
return nil if ext != ".vmdk" && ext != ".miq"
size = File.size(ostruct.fileName)
f = File.new(ostruct.fileName, "rb")
magic = f.read(4)
if magic == SPARSE_MAGIC
# get descriptor offset & size.
f.seek(24, IO::SEEK_CUR)
ofs = f.read(8).unpack("Q")[0]
siz = f.read(8).unpack("Q")[0]
end
binary = false
if (magic != SPARSE_MAGIC) && (magic != COWD_MAGIC)
f.rewind
loop do
data = f.read(4096)
break if data.nil?
binary = binary_data?(data)
break if binary
end
end
f.close
return COWD_MOD if magic == COWD_MAGIC
if magic == SPARSE_MAGIC
# If this ostruct already has a descriptor don't bother checking.
# NOTE: If it does have a descriptor, we're coming from VMWareDescriptor.rb
# trying to open a disk - so don't regress infinitely.
if ostruct.Descriptor.nil? && ofs > 0
getDescriptor(ofs, siz, ostruct) if ofs > 0
return DESC_MOD
end
return SPARSE_MOD
end
return false if binary
DESC_MOD
end
def self.getDescriptor(ofs, siz, ostruct)
f = File.open(ostruct.fileName, "rb")
f.seek(ofs * 512, IO::SEEK_SET)
desc = f.read(siz * 512)
f.close
pos = desc.index("\000")
desc = desc[0...pos] unless pos.nil?
ostruct.Descriptor = desc
end
def self.binary_data?(str)
return false if str.nil? || str.empty?
return (str.count("^ -~", "^\r\n") / str.size > 0.3 || str.count("\x00") > 0) unless str.empty?
end
end # module VMWareDiskProbe
Version data entries
66 entries across 66 versions & 1 rubygems