$ git clone -n https://src.fedoraproject.org/rpms/kf6-kwidgetsaddons.git /var/lib/mock/f42-build-side-1-3511699-46059/root/chroot_tmpdir/scmroot/kf6-kwidgetsaddons
Cloning into '/var/lib/mock/f42-build-side-1-3511699-46059/root/chroot_tmpdir/scmroot/kf6-kwidgetsaddons'...
$ git fetch origin e690889b5cc6876e6992e7d0b0df2222e22a1c55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kwidgetsaddons
 * [new ref]         e690889b5cc6876e6992e7d0b0df2222e22a1c55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e690889 Rebuild (python-pyside6)