$ git clone -n https://src.fedoraproject.org/rpms/rust-futures.git /var/lib/mock/f41-build-side-1-2907279-34727/root/chroot_tmpdir/scmroot/rust-futures
Cloning into '/var/lib/mock/f41-build-side-1-2907279-34727/root/chroot_tmpdir/scmroot/rust-futures'...
$ git fetch origin 71244ab09e8fc14fb913c6edd4fbdfb85d3131fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futures
 * [new ref]         71244ab09e8fc14fb913c6edd4fbdfb85d3131fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71244ab Update to version 0.3.31; Fixes RHBZ#2316600