$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio-serde.git /var/lib/mock/f40-build-2269729-54777/root/chroot_tmpdir/scmroot/rust-tokio-serde
Cloning into '/var/lib/mock/f40-build-2269729-54777/root/chroot_tmpdir/scmroot/rust-tokio-serde'...
$ git fetch origin a0448b3b99debaf9dec4ca1992fa54fa88fc150b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio-serde
 * [new ref]         a0448b3b99debaf9dec4ca1992fa54fa88fc150b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0448b3 Initial import