$ git clone -n https://src.fedoraproject.org/rpms/kf5-kwindowsystem.git /var/lib/mock/f45-build-14928-465/root/chroot_tmpdir/scmroot/kf5-kwindowsystem
Cloning into '/var/lib/mock/f45-build-14928-465/root/chroot_tmpdir/scmroot/kf5-kwindowsystem'...
$ git fetch origin f79b82d90706f017dfbe35385268917c6f872fec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kwindowsystem
 * [new ref]         f79b82d90706f017dfbe35385268917c6f872fec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f79b82d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild