$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio.git /var/lib/mock/f41-build-side-1-3129189-39576/root/chroot_tmpdir/scmroot/rust-tokio
Cloning into '/var/lib/mock/f41-build-side-1-3129189-39576/root/chroot_tmpdir/scmroot/rust-tokio'...
$ git fetch origin 4e8738bb0de5d7df2dedb965d1fb31faefae6237:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio
 * [new ref]         4e8738bb0de5d7df2dedb965d1fb31faefae6237 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e8738b Update to version 1.41.1; Fixes RHBZ#2324358