Module: VMWareDiskProbe
- Defined in:
- lib/disk/modules/VMWareDiskProbe.rb
Constant Summary collapse
- SPARSE_MAGIC =
"KDMV"
- SPARSE_MOD =
"VMWareSparseDisk"
- COWD_MAGIC =
"COWD"
- COWD_MOD =
"VMWareCowdDisk"
- DESC_MOD =
"VMWareDescriptor"
Class Method Summary collapse
Class Method Details
.binary_data?(str) ⇒ Boolean
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# File 'lib/disk/modules/VMWareDiskProbe.rb', line 70 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 |
.getDescriptor(ofs, siz, ostruct) ⇒ Object
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# File 'lib/disk/modules/VMWareDiskProbe.rb', line 59 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 |
.probe(ostruct) ⇒ Object
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# File 'lib/disk/modules/VMWareDiskProbe.rb', line 10 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 |