$ git clone -n https://src.fedoraproject.org/rpms/rust-protobuf.git /var/lib/mock/f45-build-44077-810/root/chroot_tmpdir/scmroot/rust-protobuf
Cloning into '/var/lib/mock/f45-build-44077-810/root/chroot_tmpdir/scmroot/rust-protobuf'...
$ git fetch origin d0a3f3922afd3e6bf10f7640b757a8c818de437e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-protobuf
 * [new ref]         d0a3f3922afd3e6bf10f7640b757a8c818de437e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0a3f39 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild