$ git clone -n https://src.fedoraproject.org/rpms/rust-protobuf-support.git /var/lib/mock/f45-build-44081-810/root/chroot_tmpdir/scmroot/rust-protobuf-support
Cloning into '/var/lib/mock/f45-build-44081-810/root/chroot_tmpdir/scmroot/rust-protobuf-support'...
$ git fetch origin b5ca7a47992de570be158f0cbf198a0f79f25a20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-protobuf-support
 * [new ref]         b5ca7a47992de570be158f0cbf198a0f79f25a20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5ca7a4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild