$ git clone -n https://src.fedoraproject.org/rpms/rust-futures.git /var/lib/mock/f39-build-2166516-50991/root/chroot_tmpdir/scmroot/rust-futures
Cloning into '/var/lib/mock/f39-build-2166516-50991/root/chroot_tmpdir/scmroot/rust-futures'...
$ git fetch origin e10807422041d8ee59f82eca2077eb8977a215e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futures
 * [new ref]         e10807422041d8ee59f82eca2077eb8977a215e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e108074 Update to version 0.3.30; Fixes RHBZ#2246397