$ git clone -n https://src.fedoraproject.org/rpms/libemu.git /var/lib/mock/f45-build-16140-483/root/chroot_tmpdir/scmroot/libemu
Cloning into '/var/lib/mock/f45-build-16140-483/root/chroot_tmpdir/scmroot/libemu'...
$ git fetch origin df01f1d45becfada11021297588d9d2100b4f1d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libemu
 * [new ref]         df01f1d45becfada11021297588d9d2100b4f1d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df01f1d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild