$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio-mock-task.git /var/lib/mock/f41-build-side-1-2897321-34638/root/chroot_tmpdir/scmroot/rust-tokio-mock-task
Cloning into '/var/lib/mock/f41-build-side-1-2897321-34638/root/chroot_tmpdir/scmroot/rust-tokio-mock-task'...
$ git fetch origin 77725eb9fa24c4158eec8224b8cebcb724c3692e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio-mock-task
 * [new ref]         77725eb9fa24c4158eec8224b8cebcb724c3692e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77725eb no longer needed