$ git clone -n https://src.fedoraproject.org/rpms/R-maps.git /var/lib/mock/f40-build-789487-135730/root/chroot_tmpdir/scmroot/R-maps
Cloning into '/var/lib/mock/f40-build-789487-135730/root/chroot_tmpdir/scmroot/R-maps'...
$ git fetch origin 9686e6358939f5a3956c7bf0c7aa10c5bbd49a5d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-maps
 * [new ref]         9686e6358939f5a3956c7bf0c7aa10c5bbd49a5d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9686e63 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild