$ git clone -n https://src.fedoraproject.org/rpms/herbstluftwm.git /var/lib/mock/f39-build-1535818-36251/root/chroot_tmpdir/scmroot/herbstluftwm
Cloning into '/var/lib/mock/f39-build-1535818-36251/root/chroot_tmpdir/scmroot/herbstluftwm'...
$ git fetch origin 86a9d15a5edcae9353f0bac92e97cc79eb0cdfa7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/herbstluftwm
 * [new ref]         86a9d15a5edcae9353f0bac92e97cc79eb0cdfa7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86a9d15 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild