$ git clone -n https://src.fedoraproject.org/forks/u2fsdgvkx1/rpms/libffi.git /var/lib/mock/f41-build-side-1-3066119-38637/root/chroot_tmpdir/scmroot/libffi
Cloning into '/var/lib/mock/f41-build-side-1-3066119-38637/root/chroot_tmpdir/scmroot/libffi'...
$ git fetch origin e3ef215f0593a797adc68ecf0c9ce15980faed52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/u2fsdgvkx1/rpms/libffi
 * [new ref]         e3ef215f0593a797adc68ecf0c9ce15980faed52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3ef215 Add riscv64 support