$ git clone -n https://src.fedoraproject.org/rpms/libliftoff.git /var/lib/mock/f45-build-16480-486/root/chroot_tmpdir/scmroot/libliftoff
Cloning into '/var/lib/mock/f45-build-16480-486/root/chroot_tmpdir/scmroot/libliftoff'...
$ git fetch origin 6649ecf3478df686cadcc04755883e6bbfc26e75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libliftoff
 * [new ref]         6649ecf3478df686cadcc04755883e6bbfc26e75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6649ecf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild