A plugin for DNF that does fedup-style upgrades using systemd's Offline Updates facility.

make install

To download everything needed to upgrade to Fedora 23:

# dnf system-upgrade download --releasever=23

Once that finishes, you can begin the upgrade process:

# dnf system-upgrade reboot

There's also a fedup-compatible wrapper script, so this works too:

# fedup --network 23
# fedup reboot

Everything printed by dnf during the upgrade is in the system journal. Run dnf system-upgrade log to see a list of boots during which an upgrade was attempted. Use dnf system-upgrade log [NUM], where [NUM] is usually -1, to see the logs for that boot using journalctl.

If you'd like a root shell available during the upgrade, add systemd.debug-shell to your boot arguments.

You can also enable the shell for all system updates/upgrades:

# systemctl add-wants system-update.target debug-shell.service

Switch to the shell with Ctrl-Alt-F9 and back to the upgrade progress with Ctrl-Alt-F1.

If the system gets stuck at system-update.target without starting the upgrade, remove /system-update to make the system boot normally.

If you don't have the debug shell available, you can use the dracut emergency shell; add rd.break to the boot args, then:

# mount -o remount,rw /sysroot
# rm /sysroot/system-update

Exit the shell and your system should start normally.