$ git clone -n https://src.fedoraproject.org/rpms/k2hash.git /var/lib/mock/f45-build-14484-461/root/chroot_tmpdir/scmroot/k2hash
Cloning into '/var/lib/mock/f45-build-14484-461/root/chroot_tmpdir/scmroot/k2hash'...
$ git fetch origin dfa587760b057e38d85f7ff1bd44acd270d19354:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/k2hash
 * [new ref]         dfa587760b057e38d85f7ff1bd44acd270d19354 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfa5877 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild