Class: FackUp::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/fackup/image.rb

Defined Under Namespace

Classes: File

Constant Summary collapse

PACK_TEMPLATE = 
"LLLIII"
PACK_SIZE = 
[0, 0, 0, 0, 0, 0].pack(PACK_TEMPLATE).bytesize

Instance Method Summary collapse

Constructor Details

#initialize(file, mode = 'r', force = false) ⇒ Image

Returns a new instance of Image.



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# File 'lib/fackup/image.rb', line 36

def initialize (file, mode='r', force=false)
  @files = []

  ::File.open(file, 'a'){} if force

  if mode == 'r'
    raise Errno::ENOENT, "File doesn't exist" unless ::File.exists?(file)

    @fd = ::File.open(file, 'rb')

    load_file

    [:push, :<<, :save].each {|meth|
      (class << self; self; end).class_eval { undef_method(meth) }
    }
  elsif mode == 'w'
    @fd = ::File.open(file, 'wb')
    (class << self; self; end).class_eval { undef_method(:each) }
  else
    raise "Unrecognized mode"
  end

  if block_given?
    yield self
    close
  end
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/fackup/image.rb', line 86

def close
  if self.respond_to?(:save)
    save
  end

  @fd.close
end

#each(&blk) ⇒ Object 



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# File 'lib/fackup/image.rb', line 74

def each(&blk)
  @files.each(&blk)
end

#push(path) ⇒ Object Also known as: << 



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# File 'lib/fackup/image.rb', line 64

def push (path)
  path = ::File.realpath(path)
  io = ::File.open(path, 'rb')
  stat = io.stat

  @files << File.new(path, io, stat.mtime, 0, io.size, stat.uid, stat.gid, stat.mode)
  self
end

#save ⇒ Object 



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# File 'lib/fackup/image.rb', line 78

def save
  @fd.write(header)
  @fd.write("\0")
  @files.each {|file|
    @fd.write(file.content)
  }
end