$ git clone -n https://src.fedoraproject.org/rpms/xxhashct.git /var/lib/mock/f45-build-39174-732/root/chroot_tmpdir/scmroot/xxhashct
Cloning into '/var/lib/mock/f45-build-39174-732/root/chroot_tmpdir/scmroot/xxhashct'...
$ git fetch origin 1d4198c6958a3c4130c8fa6e3303e276f4ea5f58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xxhashct
 * [new ref]         1d4198c6958a3c4130c8fa6e3303e276f4ea5f58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d4198c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild