makeself.sh is a shell script that generates a self-extractable tar.gz archive from a directory. The resulting file appears as a shell script, and can be launched as is. The archive will then uncompress itself to a temporary directory and an arbitrary command will be executed (for example an installation script). This is pretty similar to archives generated with WinZip Self-Extractor in the Windows world.
acquired package info from repodata DB: repodata/f0b2606f1dc0294014b17bb8ea9231f0129611b4c9610b9db40f82da2b1f63da-primary.sqlite.bz2