Support for converting tarballs to ext2

[josch]

Hi,

would you accept a pull request allowing genext2fs to read a tarball (for example by using libarchive) and turn it into an ext2 image?

Even non-root users can easily create, store and manipulate tarballs containing files, directories and device nodes with arbitrary ownership, permissions, timestamps and other attributes. The interface could be as simple as:

$ genext2fs < rootfs.tar > rootfs.img

What do you think?

[bestouff]

I love it.