$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio-stream.git /var/lib/mock/f45-build-45528-823/root/chroot_tmpdir/scmroot/rust-tokio-stream
Cloning into '/var/lib/mock/f45-build-45528-823/root/chroot_tmpdir/scmroot/rust-tokio-stream'...
$ git fetch origin 3b6911042542b76bc6e89f02dceb8b5c773b2835:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio-stream
 * [new ref]         3b6911042542b76bc6e89f02dceb8b5c773b2835 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b69110 Update to version 0.1.19; Fixes RHBZ#2506040