$ git clone -n https://src.fedoraproject.org/rpms/kf6-purpose.git /var/lib/mock/f40-build-2316056-57994/root/chroot_tmpdir/scmroot/kf6-purpose
Cloning into '/var/lib/mock/f40-build-2316056-57994/root/chroot_tmpdir/scmroot/kf6-purpose'...
$ git fetch origin 2c04b9f970de0a17e7343d258285db70494087a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-purpose
 * [new ref]         2c04b9f970de0a17e7343d258285db70494087a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c04b9f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild