$ git clone -n https://src.fedoraproject.org/rpms/R-pak.git /var/lib/mock/f40-build-2107554-50596/root/chroot_tmpdir/scmroot/R-pak
Cloning into '/var/lib/mock/f40-build-2107554-50596/root/chroot_tmpdir/scmroot/R-pak'...
$ git fetch origin 12b5564127b69691acc59023bcdfcc9e4ac73af2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pak
 * [new ref]         12b5564127b69691acc59023bcdfcc9e4ac73af2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12b5564 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild