$ git clone -n https://src.fedoraproject.org/rpms/rust-ring.git /var/lib/mock/f45-build-44374-813/root/chroot_tmpdir/scmroot/rust-ring
Cloning into '/var/lib/mock/f45-build-44374-813/root/chroot_tmpdir/scmroot/rust-ring'...
$ git fetch origin bd9024174c6e248c2ecd202cbecd30d3e350c220:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ring
 * [new ref]         bd9024174c6e248c2ecd202cbecd30d3e350c220 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd90241 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild