$ git clone -n https://src.fedoraproject.org/rpms/rust-futures0.1.git /var/lib/mock/f41-build-side-1-2954351-35544/root/chroot_tmpdir/scmroot/rust-futures0.1
Cloning into '/var/lib/mock/f41-build-side-1-2954351-35544/root/chroot_tmpdir/scmroot/rust-futures0.1'...
$ git fetch origin 883032a2bd49b5f2fb2057b0adca6eb3f9c7880a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futures0.1
 * [new ref]         883032a2bd49b5f2fb2057b0adca6eb3f9c7880a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 883032a compat package no longer needed