$ git clone -n https://src.fedoraproject.org/rpms/rust-kurbu5-derive.git /var/lib/mock/f45-build-42794-796/root/chroot_tmpdir/scmroot/rust-kurbu5-derive
Cloning into '/var/lib/mock/f45-build-42794-796/root/chroot_tmpdir/scmroot/rust-kurbu5-derive'...
$ git fetch origin 5a889a76816dc7494d6ce3a2fec154122c8106f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-kurbu5-derive
 * [new ref]         5a889a76816dc7494d6ce3a2fec154122c8106f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a889a7 Update to version 0.1.4