$ git clone -n https://src.fedoraproject.org/rpms/kf6-kguiaddons.git /var/lib/mock/f42-build-3513410-46031/root/chroot_tmpdir/scmroot/kf6-kguiaddons
Cloning into '/var/lib/mock/f42-build-3513410-46031/root/chroot_tmpdir/scmroot/kf6-kguiaddons'...
$ git fetch origin 1f6f268e6c1729a6246d9cadaa5ab46dd0d1ca75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kguiaddons
 * [new ref]         1f6f268e6c1729a6246d9cadaa5ab46dd0d1ca75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f6f268 Rebuild (qt6)