$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcoreaddons.git /var/lib/mock/f42-build-side-1-3508092-46013/root/chroot_tmpdir/scmroot/kf6-kcoreaddons
Cloning into '/var/lib/mock/f42-build-side-1-3508092-46013/root/chroot_tmpdir/scmroot/kf6-kcoreaddons'...
$ git fetch origin eb099719e5967f9551418de04d03d7d6176695a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcoreaddons
 * [new ref]         eb099719e5967f9551418de04d03d7d6176695a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb09971 Rebuild (python-pyside6)