$ git clone -n https://src.fedoraproject.org/rpms/R-NISTunits.git /var/lib/mock/f40-build-2321819-58611/root/chroot_tmpdir/scmroot/R-NISTunits
Cloning into '/var/lib/mock/f40-build-2321819-58611/root/chroot_tmpdir/scmroot/R-NISTunits'...
$ git fetch origin 34c7f607cba548c62d60380e32bc50e4110329b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-NISTunits
 * [new ref]         34c7f607cba548c62d60380e32bc50e4110329b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34c7f60 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild