$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio-tar.git /var/lib/mock/f42-build-side-1-3588308-46944/root/chroot_tmpdir/scmroot/rust-tokio-tar
Cloning into '/var/lib/mock/f42-build-side-1-3588308-46944/root/chroot_tmpdir/scmroot/rust-tokio-tar'...
$ git fetch origin dc7833cb621d2ce96526e3e4b90387c27407ac74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio-tar
 * [new ref]         dc7833cb621d2ce96526e3e4b90387c27407ac74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc7833c Orphaned for 6+ weeks