This is fedup, the Fedora Upgrade tool. This repo/package has the following contents:

Frontend / pre-upgrade

This is the GUI/CLI frontend. It’s responsible for setting up the system to be upgraded: downloading packages, modifying the bootloader, etc.

• Files: fedup/, fedup.py, fedup-gtk.py (and ui/)

Upgrade services

Part of a distro-neutral framework for performing major system upgrades using systemd and dracut, with a plymouth progress screen. This part lets your system switch back to the upgrade initramfs after setting up your disks.

• Files: systemd/

The actual upgrade is handled inside the initramfs by fedup-dracut, which can be found here: https://github.com/wgwoods/fedup-dracut/

fedup is packaged in Fedora 17 and later; to upgrade to the most recent released version of Fedora 18 over the network, do:

If you want to use upgrade images from a test tree that’s not in the Fedora mirror system, do:

The URL should be the directory that contains .treeinfo (usually the /os/ dir.)

If you want to install from media, make sure it’s mounted and then run

More information for Fedora users and testers can be found on the Fedora wiki.

For you brave pioneers who want to do it all yourselves, you will need at least two systems: one with the new release (to build upgrade images), and then any old systems you want to upgrade.