$ git clone -n https://src.fedoraproject.org/rpms/golang-google-protobuf.git /var/lib/mock/f45-build-12660-443/root/chroot_tmpdir/scmroot/golang-google-protobuf
Cloning into '/var/lib/mock/f45-build-12660-443/root/chroot_tmpdir/scmroot/golang-google-protobuf'...
$ git fetch origin dfb283d2706636bb6b231884b5b2d20f901634ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-google-protobuf
 * [new ref]         dfb283d2706636bb6b231884b5b2d20f901634ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfb283d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild