$ git clone -n https://src.fedoraproject.org/rpms/R-xopen.git /var/lib/mock/f39-build-1544874-36671/root/chroot_tmpdir/scmroot/R-xopen
Cloning into '/var/lib/mock/f39-build-1544874-36671/root/chroot_tmpdir/scmroot/R-xopen'...
$ git fetch origin 8d550e511d661b9cad1a0f0bdf73946fd89cbfe9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-xopen
 * [new ref]         8d550e511d661b9cad1a0f0bdf73946fd89cbfe9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d550e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild