Module: FileDependencies::Archive

Defined in:
lib/file-dependencies/archive.rb

Overview

:nodoc:

Class Method Summary collapse

Class Method Details

.extract_file?(entry, extract = nil, exclude = nil, prefix) ⇒ Boolean


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# File 'lib/file-dependencies/archive.rb', line 67

def extract_file?(entry, extract=nil, exclude=nil, prefix)
  return true if extract.nil? && exclude.nil?
  return false if tar_header?(entry)

  if extract
    return match?(entry, extract, prefix)
  elsif exclude
    return !match?(entry, exclude, prefix)
  end
end

.match?(entry, list, prefix) ⇒ Boolean


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# File 'lib/file-dependencies/archive.rb', line 79

def match?(entry, list, prefix)
  return false if list.nil?

  if list.is_a?(Array)
    list.each do |pattern|
      if pattern.is_a?(Regexp) or regexp_string?(pattern)
        return true if entry =~ Regexp.new(pattern)
      elsif pattern.is_a?(String)
        return true if pattern == entry.gsub(prefix, '')
      end
    end
  end
  false
end

.regexp_string?(pattern) ⇒ Boolean


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# File 'lib/file-dependencies/archive.rb', line 100

def regexp_string?(pattern)
  pattern.to_s.match('^\(\?-mix:.+\)$')
end

.tar_header?(entry) ⇒ Boolean


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# File 'lib/file-dependencies/archive.rb', line 95

def tar_header?(entry)
  entry =~ /PaxHeaders/
end

.ungzip(file, outdir) ⇒ Object


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# File 'lib/file-dependencies/archive.rb', line 7

def ungzip(file, outdir)
  output = ::File.join(outdir, file.gsub('.gz', '').split(::File::SEPARATOR).last)
  tgz = Zlib::GzipReader.new(::File.open(file))
  begin
    ::File.open(output, "w") do |out|
      IO.copy_stream(tgz, out)
    end
    ::File.unlink(file)
  rescue
    ::File.unlink(output) if ::File.file?(output)
    raise
  end
  tgz.close
end

.untar(tarball, &block) ⇒ Object


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# File 'lib/file-dependencies/archive.rb', line 23

def untar(tarball, &block)
  tgz = Zlib::GzipReader.new(::File.open(tarball))
  tar = ::Archive::Tar::Minitar::Input.open(tgz)
  tar.each do |entry|
    path = block.call(entry)
    next if path.nil?
    parent = ::File.dirname(path)

    FileUtils.mkdir_p(parent) unless ::File.directory?(parent)

    # Skip this file if the output file is the same size
    if entry.directory?
      FileUtils.mkdir_p(path) unless ::File.directory?(path)
    else
      entry_mode = entry.instance_eval { @mode } & 0777
      if ::File.exist?(path)
        stat = ::File.stat(path)
        # TODO(sissel): Submit a patch to archive-tar-minitar upstream to
        # expose headers in the entry.
        entry_size = entry.instance_eval { @size }
        # If file sizes are same, skip writing.
        next if stat.size == entry_size && (stat.mode & 0777) == entry_mode
      end
      puts "Extracting #{entry.full_name} from #{tarball} #{entry_mode.to_s(8)}" if $DEBUG
      ::File.open(path, "w") do |fd|
        # eof? check lets us skip empty files. Necessary because the API provided by
        # Archive::Tar::Minitar::Reader::EntryStream only mostly acts like an
        # IO object. Something about empty files in this EntryStream causes
        # IO.copy_stream to throw "can't convert nil into String" on JRuby
        # TODO(sissel): File a bug about this.
        until entry.eof?
          chunk = entry.read(16_384)
          fd.write(chunk)
        end
        # IO.copy_stream(entry, fd)
      end
      ::File.chmod(entry_mode, path)
    end
  end
  tar.close
  ::File.unlink(tarball) if ::File.file?(tarball)
end