$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ox.git /var/lib/mock/f45-build-35047-693/root/chroot_tmpdir/scmroot/rubygem-ox
Cloning into '/var/lib/mock/f45-build-35047-693/root/chroot_tmpdir/scmroot/rubygem-ox'...
$ git fetch origin 43a94e32f9a461519fdb969509d9857292ec3831:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ox
 * [new ref]         43a94e32f9a461519fdb969509d9857292ec3831 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43a94e3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild