$ git clone -n https://src.fedoraproject.org/rpms/rust-muldiv.git /var/lib/mock/f45-build-43235-801/root/chroot_tmpdir/scmroot/rust-muldiv
Cloning into '/var/lib/mock/f45-build-43235-801/root/chroot_tmpdir/scmroot/rust-muldiv'...
$ git fetch origin 6fa686a4ddeb655468a5cc076cc96366363c9f40:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-muldiv
 * [new ref]         6fa686a4ddeb655468a5cc076cc96366363c9f40 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fa686a Regenerate with rust2rpm v28