$ git clone -n https://src.fedoraproject.org/rpms/libev.git /var/lib/mock/f45-build-16143-483/root/chroot_tmpdir/scmroot/libev
Cloning into '/var/lib/mock/f45-build-16143-483/root/chroot_tmpdir/scmroot/libev'...
$ git fetch origin 377e68a1dd5137f90a9c3520995ecd8643cf81df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libev
 * [new ref]         377e68a1dd5137f90a9c3520995ecd8643cf81df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 377e68a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild