$ git clone -n https://src.fedoraproject.org/rpms/R-tkWidgets.git /var/lib/mock/f39-build-1524722-36035/root/chroot_tmpdir/scmroot/R-tkWidgets
Cloning into '/var/lib/mock/f39-build-1524722-36035/root/chroot_tmpdir/scmroot/R-tkWidgets'...
$ git fetch origin b8853894ed233e39543eb31e8039c7e3eeeb3cc2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tkWidgets
 * [new ref]         b8853894ed233e39543eb31e8039c7e3eeeb3cc2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b885389 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild