$ git clone -n https://src.fedoraproject.org/rpms/librepository.git /var/lib/mock/f45-build-16905-493/root/chroot_tmpdir/scmroot/librepository
Cloning into '/var/lib/mock/f45-build-16905-493/root/chroot_tmpdir/scmroot/librepository'...
$ git fetch origin 4945165ae99d6897b5da6a0032dee06250101b1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librepository
 * [new ref]         4945165ae99d6897b5da6a0032dee06250101b1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4945165 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild