shell: Add support for .tbz2/.tgz tarballs
shell: Add support for .tbz2/.tgz tarballs

And raise an exception when it's a format we don't support so yours
truly doesn't have to guess what's going on ...

cee1/cerbero-mac,cee1/cerbero-mac,cee1/cerbero-mac,cee1/cerbero-mac