$ git clone -n https://src.fedoraproject.org/rpms/libmcrypt.git /var/lib/mock/f45-build-16535-487/root/chroot_tmpdir/scmroot/libmcrypt
Cloning into '/var/lib/mock/f45-build-16535-487/root/chroot_tmpdir/scmroot/libmcrypt'...
$ git fetch origin 018b4a9b74cfd125c1aff1267b25509aa251e23c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmcrypt
 * [new ref]         018b4a9b74cfd125c1aff1267b25509aa251e23c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 018b4a9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild