$ git clone -n https://src.fedoraproject.org/rpms/rust-memcached-rs.git /var/lib/mock/f41-build-side-1-3134849-39763/root/chroot_tmpdir/scmroot/rust-memcached-rs
Cloning into '/var/lib/mock/f41-build-side-1-3134849-39763/root/chroot_tmpdir/scmroot/rust-memcached-rs'...
$ git fetch origin c39176ef449435ced08a49f70f7f87985b889437:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-memcached-rs
 * [new ref]         c39176ef449435ced08a49f70f7f87985b889437 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c39176e unused leaf package for more than two release cycles