$ git clone -n https://src.fedoraproject.org/rpms/golang-github-nats-io.git /var/lib/mock/f39-build-1815682-41837/root/chroot_tmpdir/scmroot/golang-github-nats-io
Cloning into '/var/lib/mock/f39-build-1815682-41837/root/chroot_tmpdir/scmroot/golang-github-nats-io'...
$ git fetch origin 09579c53770e3d52dac25973ec7e91e0b509903f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-nats-io
 * [new ref]         09579c53770e3d52dac25973ec7e91e0b509903f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09579c5 update to 1.3.1, close rhbz#2244379