$ git clone -n https://src.fedoraproject.org/rpms/t4k_common.git /var/lib/mock/f39-build-1496823-34568/root/chroot_tmpdir/scmroot/t4k_common
Cloning into '/var/lib/mock/f39-build-1496823-34568/root/chroot_tmpdir/scmroot/t4k_common'...
$ git fetch origin 3495b04fd69ecc64c8bad5abc5f7df7d208b4e0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/t4k_common
 * [new ref]         3495b04fd69ecc64c8bad5abc5f7df7d208b4e0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3495b04 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild