$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio0.2.git /var/lib/mock/f41-build-side-1-3129197-39576/root/chroot_tmpdir/scmroot/rust-tokio0.2
Cloning into '/var/lib/mock/f41-build-side-1-3129197-39576/root/chroot_tmpdir/scmroot/rust-tokio0.2'...
$ git fetch origin 82be7407fe446d6346df45a41923f99fa9306a3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio0.2
 * [new ref]         82be7407fe446d6346df45a41923f99fa9306a3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82be740 compat package no longer needed