$ git clone -n https://src.fedoraproject.org/rpms/rust-version-track.git /var/lib/mock/f45-build-46070-830/root/chroot_tmpdir/scmroot/rust-version-track
Cloning into '/var/lib/mock/f45-build-46070-830/root/chroot_tmpdir/scmroot/rust-version-track'...
$ git fetch origin b4f03db82d194fab52de46b8143cd094a1653531:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-version-track
 * [new ref]         b4f03db82d194fab52de46b8143cd094a1653531 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4f03db Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild