$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio-fs.git /var/lib/mock/f41-build-side-1-2897327-34638/root/chroot_tmpdir/scmroot/rust-tokio-fs
Cloning into '/var/lib/mock/f41-build-side-1-2897327-34638/root/chroot_tmpdir/scmroot/rust-tokio-fs'...
$ git fetch origin bed8c5682bba43d8e60a11ee79681d6f5e433486:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio-fs
 * [new ref]         bed8c5682bba43d8e60a11ee79681d6f5e433486 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bed8c56 no longer needed