$ git clone -n https://src.fedoraproject.org/rpms/R-bench.git /var/lib/mock/f39-build-2346303-59957/root/chroot_tmpdir/scmroot/R-bench
Cloning into '/var/lib/mock/f39-build-2346303-59957/root/chroot_tmpdir/scmroot/R-bench'...
$ git fetch origin 325cf7465454e8c2fb62b25982e26c8895a3b645:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-bench
 * [new ref]         325cf7465454e8c2fb62b25982e26c8895a3b645 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 325cf74 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild