$ git clone -n https://src.fedoraproject.org/rpms/google-gson.git /var/lib/mock/f38-build-side-42-init-devel-659774-26626/root/chroot_tmpdir/scmroot/google-gson
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-659774-26626/root/chroot_tmpdir/scmroot/google-gson'...
$ git fetch origin 31527114e6e9227734e4972a8b75e09f0c8a89ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/google-gson
 * [new ref]         31527114e6e9227734e4972a8b75e09f0c8a89ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3152711 Update google-gson to 2.10.1