$ git clone -n https://src.fedoraproject.org/rpms/R-nanotime.git /var/lib/mock/f40-build-789579-135920/root/chroot_tmpdir/scmroot/R-nanotime
Cloning into '/var/lib/mock/f40-build-789579-135920/root/chroot_tmpdir/scmroot/R-nanotime'...
$ git fetch origin 5d9dc5369e3a8e72161907d071f3e143194cda31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-nanotime
 * [new ref]         5d9dc5369e3a8e72161907d071f3e143194cda31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d9dc53 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild