$ git clone -n https://src.fedoraproject.org/rpms/kf5.git /var/lib/mock/f45-build-14747-463/root/chroot_tmpdir/scmroot/kf5
Cloning into '/var/lib/mock/f45-build-14747-463/root/chroot_tmpdir/scmroot/kf5'...
$ git fetch origin 249e170c4968b43afee96b0768c4a335b81dfcbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5
 * [new ref]         249e170c4968b43afee96b0768c4a335b81dfcbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 249e170 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild