$ git clone -n https://src.fedoraproject.org/rpms/R-R.cache.git /var/lib/mock/f39-build-1524671-36035/root/chroot_tmpdir/scmroot/R-R.cache
Cloning into '/var/lib/mock/f39-build-1524671-36035/root/chroot_tmpdir/scmroot/R-R.cache'...
$ git fetch origin f8ad6e90a1969972a1d3050199a78e7475e6b075:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-R.cache
 * [new ref]         f8ad6e90a1969972a1d3050199a78e7475e6b075 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8ad6e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild