$ git clone -n https://src.fedoraproject.org/rpms/rust-toml_datetime.git /var/lib/mock/f42-build-side-1-3586642-46924/root/chroot_tmpdir/scmroot/rust-toml_datetime
Cloning into '/var/lib/mock/f42-build-side-1-3586642-46924/root/chroot_tmpdir/scmroot/rust-toml_datetime'...
$ git fetch origin ff3802b9955c4c1e9b42610cbc6c4227f27353bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-toml_datetime
 * [new ref]         ff3802b9955c4c1e9b42610cbc6c4227f27353bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff3802b Update to version 0.6.11