$ git clone -n https://src.fedoraproject.org/rpms/golang-github-protobuf.git /var/lib/mock/f45-build-12446-442/root/chroot_tmpdir/scmroot/golang-github-protobuf
Cloning into '/var/lib/mock/f45-build-12446-442/root/chroot_tmpdir/scmroot/golang-github-protobuf'...
$ git fetch origin 6294cc27d2bd38f92211b1fabfea875a6e7a633a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-protobuf
 * [new ref]         6294cc27d2bd38f92211b1fabfea875a6e7a633a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6294cc2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild