$ git clone -n https://src.fedoraproject.org/rpms/R-crosstalk.git /var/lib/mock/f40-build-2155832-50918/root/chroot_tmpdir/scmroot/R-crosstalk
Cloning into '/var/lib/mock/f40-build-2155832-50918/root/chroot_tmpdir/scmroot/R-crosstalk'...
$ git fetch origin e20ef9967bda5c8e899bdafda25553a0f0d26f92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-crosstalk
 * [new ref]         e20ef9967bda5c8e899bdafda25553a0f0d26f92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e20ef99 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild