Class: Dev::Tar

Inherits:
Object show all
Defined in:
lib/firespring_dev_commands/tar.rb,
lib/firespring_dev_commands/tar/type_flag.rb,
lib/firespring_dev_commands/tar/pax_header.rb

Overview

Class for natively un-tar’ing a file in ruby

Defined Under Namespace

Modules: PaxHeader, TypeFlag

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data = nil) ⇒ Tar

Returns a new instance of Tar.



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# File 'lib/firespring_dev_commands/tar.rb', line 8

def initialize(data = nil)
  @data = data
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/firespring_dev_commands/tar.rb', line 6

def data
  @data
end

Instance Method Details

#unpack(source_path, dest_path) ⇒ Object

Unpack all data in the given tar into the dest_path



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# File 'lib/firespring_dev_commands/tar.rb', line 13

def unpack(source_path, dest_path)
  data.rewind
  extended_headers = nil
  ::Gem::Package::TarReader.new(data).each do |entry|
    # Using https://github.com/kr/tarutil/blob/master/untar.go as a template
    # Also check out https://go.googlesource.com/go/+/master/src/archive/tar/reader.go?autodive=0%2F%2F%2F
    case entry.header.typeflag
    when TypeFlag::TYPE_DIR
      merge_pax(entry, extended_headers)
      dest_name = calc_dest_name(source_path, dest_path, entry)
      create_directory(entry, dest_name)

    when TypeFlag::TYPE_REG, TypeFlag::TYPE_REG_A
      merge_pax(entry, extended_headers)
      dest_name = calc_dest_name(source_path, dest_path, entry)
      create_file(entry, dest_name)

    when TypeFlag::TYPE_LINK
      raise 'Unimplemented file type: Link'

    when TypeFlag::TYPE_SYMLINK
      merge_pax(entry, extended_headers)
      dest_name = calc_dest_name(source_path, dest_path, entry)
      create_symlink(entry, dest_name)

    when TypeFlag::TYPE_X_HEADER
      extended_headers = parse_pax(entry.read)
      next

    when TypeFlag::TYPE_CONT, TypeFlag::TYPE_X_GLOBAL_HEADER
      raise 'Unimplemented file type Cont/XGlobalHeader'

    when TypeFlag::TYPE_CHAR, TypeFlag::TYPE_BLOCK, TypeFlag::TYPE_FIFO
      raise 'Unimplemented file type: Char/Block/Fifo'

    else
      raise 'Unrecognized file type'

    end

    # If we got here we should be done with any extended headers
    extended_headers = nil
  end
end