$ git clone -n https://src.fedoraproject.org/rpms/box64.git /var/lib/mock/f45-build-6590-349/root/chroot_tmpdir/scmroot/box64
Cloning into '/var/lib/mock/f45-build-6590-349/root/chroot_tmpdir/scmroot/box64'...
$ git fetch origin 37ac45e73c1633587e4a7723fee90aa4bce78f23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/box64
 * [new ref]         37ac45e73c1633587e4a7723fee90aa4bce78f23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37ac45e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild