$ git clone -n https://src.fedoraproject.org/rpms/rust-sized-chunks.git /var/lib/mock/f45-build-44992-820/root/chroot_tmpdir/scmroot/rust-sized-chunks
Cloning into '/var/lib/mock/f45-build-44992-820/root/chroot_tmpdir/scmroot/rust-sized-chunks'...
$ git fetch origin d3198589f6f934ac833d3f9dff2cae04c58c8034:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sized-chunks
 * [new ref]         d3198589f6f934ac833d3f9dff2cae04c58c8034 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d319858 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild