Class: Archive::Tar::Minitar::Input

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/folio/minitar.rb

Overview

Wraps a Archive::Tar::Minitar::Reader with convenience methods and wrapped stream management; Input only works with random access data streams. See Input::new for details.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Input

Creates a new Input object. If input is a stream object that responds to #read), then it will simply be wrapped. Otherwise, one will be created and opened using Kernel#open. When Input#close is called, the stream object wrapped will be closed.



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# File 'lib/folio/minitar.rb', line 749

def initialize(input)
  if input.respond_to?(:read)
    @io = input
  else
    @io = open(input, "rb")
  end
  @tarreader = Archive::Tar::Minitar::Reader.new(@io)
end

Class Method Details

.open(input) ⇒ Object

With no associated block, Input::open is a synonym for Input::new. If the optional code block is given, it will be passed the new writer as an argument and the Input object will automatically be closed when the block terminates. In this instance, Input::open returns the value of the block.



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# File 'lib/folio/minitar.rb', line 732

def self.open(input)
  stream = Input.new(input)
  return stream unless block_given?

  begin
    res = yield stream
  ensure
    stream.close
  end

  res
end

Instance Method Details

#close ⇒ Object

Closes the Reader object and the wrapped data stream.



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# File 'lib/folio/minitar.rb', line 847

def close
  @io.close
  @tarreader.close
end

#each(&block) ⇒ Object

Iterates through each entry and rewinds to the beginning of the stream when finished.



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# File 'lib/folio/minitar.rb', line 760

def each(&block)
  @tarreader.each { |entry| yield entry }
ensure
  @tarreader.rewind
end

#extract_entry(destdir, entry) ⇒ Object

Extracts the current entry to destdir. If a block is provided, it yields an action Symbol, the full name of the file being extracted (name), and a Hash of statistical information (stats).

The action will be one of:

:dir

The entry is a directory.

:file_start

The entry is a file; the extract of the file is just beginning.

:file_progress

Yielded every 4096 bytes during the extract of the entry.

:file_done

Yielded when the entry is completed.

The stats hash contains the following keys:

:current

The current total number of bytes read in the entry.

:currinc

The current number of bytes read in this read cycle.

:entry

The entry being extracted; this is a Reader::EntryStream, with all methods thereof.



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# File 'lib/folio/minitar.rb', line 785

def extract_entry(destdir, entry) # :yields action, name, stats:
  stats = {
    :current  => 0,
    :currinc  => 0,
    :entry    => entry
  }

  if entry.directory?
    dest = File.join(destdir, entry.full_name)

    yield :dir, entry.full_name, stats if block_given?

    if Archive::Tar::Minitar.dir?(dest)
      begin
        FileUtils.chmod(entry.mode, dest)
      rescue Exception
        nil
      end
    else
      FileUtils.mkdir_p(dest, :mode => entry.mode)
      FileUtils.chmod(entry.mode, dest)
    end

    fsync_dir(dest)
    fsync_dir(File.join(dest, ".."))
    return
  else # it's a file
    destdir = File.join(destdir, File.dirname(entry.full_name))
    FileUtils.mkdir_p(destdir, :mode => 0755)

    destfile = File.join(destdir, File.basename(entry.full_name))
    FileUtils.chmod(0600, destfile) rescue nil  # Errno::ENOENT

    yield :file_start, entry.full_name, stats if block_given?

    File.open(destfile, "wb", entry.mode) do |os|
      loop do
        data = entry.read(4096)
        break unless data

        stats[:currinc] = os.write(data)
        stats[:current] += stats[:currinc]

        yield :file_progress, entry.full_name, stats if block_given?
      end
      os.fsync
    end

    FileUtils.chmod(entry.mode, destfile)
    fsync_dir(File.dirname(destfile))
    fsync_dir(File.join(File.dirname(destfile), ".."))

    yield :file_done, entry.full_name, stats if block_given?
  end
end

#tar ⇒ Object

Returns the Reader object for direct access.



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# File 'lib/folio/minitar.rb', line 842

def tar
  @tarreader
end