minitar

https://github.com/halostatue/minitar

The minitar library is a pure-Ruby library that provides the ability to deal with POSIX tar(1) archive files. This is release 0.9, adding a minor feature to Minitar.unpack and Minitar::Input#extract_entry that when :fsync => false is provided, fsync will be skipped. minitar (previously called Archive::Tar::Minitar) is based heavily on code originally written by Mauricio Julio Fernández Pradier for the rpa-base project.