$ git clone -n https://src.fedoraproject.org/rpms/rust-rav1e.git /var/lib/mock/f45-build-44292-812/root/chroot_tmpdir/scmroot/rust-rav1e
Cloning into '/var/lib/mock/f45-build-44292-812/root/chroot_tmpdir/scmroot/rust-rav1e'...
$ git fetch origin 9aa3aec6b4536da00a925b903c86c96839042933:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rav1e
 * [new ref]         9aa3aec6b4536da00a925b903c86c96839042933 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9aa3aec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild