$ git clone -n https://src.fedoraproject.org/rpms/rust-futures-cpupool.git /var/lib/mock/f41-build-side-1-3124896-39482/root/chroot_tmpdir/scmroot/rust-futures-cpupool
Cloning into '/var/lib/mock/f41-build-side-1-3124896-39482/root/chroot_tmpdir/scmroot/rust-futures-cpupool'...
$ git fetch origin a133966fe1ac8e9ec5e6c84ee4f5a0d65cc62bea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futures-cpupool
 * [new ref]         a133966fe1ac8e9ec5e6c84ee4f5a0d65cc62bea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a133966 no longer needed