$ git clone -n https://src.fedoraproject.org/rpms/kf6-kwidgetsaddons.git /var/lib/mock/f40-build-2542636-61881/root/chroot_tmpdir/scmroot/kf6-kwidgetsaddons
Cloning into '/var/lib/mock/f40-build-2542636-61881/root/chroot_tmpdir/scmroot/kf6-kwidgetsaddons'...
$ git fetch origin 99b8ef8ffad650325695a7ef057687a664aaaa43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kwidgetsaddons
 * [new ref]         99b8ef8ffad650325695a7ef057687a664aaaa43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99b8ef8 6.0.0