$ git clone -n https://src.fedoraproject.org/rpms/R-maps.git /var/lib/mock/f40-build-2270148-54793/root/chroot_tmpdir/scmroot/R-maps
Cloning into '/var/lib/mock/f40-build-2270148-54793/root/chroot_tmpdir/scmroot/R-maps'...
$ git fetch origin ebeb5bef326869a11bf1a5e9bd3704a0d803f8b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-maps
 * [new ref]         ebeb5bef326869a11bf1a5e9bd3704a0d803f8b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebeb5be Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild