$ git clone -n https://src.fedoraproject.org/rpms/libepubgen.git /var/lib/mock/f45-build-16142-483/root/chroot_tmpdir/scmroot/libepubgen
Cloning into '/var/lib/mock/f45-build-16142-483/root/chroot_tmpdir/scmroot/libepubgen'...
$ git fetch origin 8eac0dd78389eb328ca8561959fcc4b021c6b536:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libepubgen
 * [new ref]         8eac0dd78389eb328ca8561959fcc4b021c6b536 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8eac0dd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild