$ git clone -n https://src.fedoraproject.org/rpms/nats-server.git /var/lib/mock/f40-build-774023-127559/root/chroot_tmpdir/scmroot/nats-server
Cloning into '/var/lib/mock/f40-build-774023-127559/root/chroot_tmpdir/scmroot/nats-server'...
$ git fetch origin ea2027ec8f0543b7c3d90af9d8a226d1aef6c50f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nats-server
 * [new ref]         ea2027ec8f0543b7c3d90af9d8a226d1aef6c50f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea2027e update to 2.10.9, close rhbz#2257990