$ git clone -n https://src.fedoraproject.org/rpms/kf6-kguiaddons.git /var/lib/mock/f42-build-side-1-3546345-46601/root/chroot_tmpdir/scmroot/kf6-kguiaddons
Cloning into '/var/lib/mock/f42-build-side-1-3546345-46601/root/chroot_tmpdir/scmroot/kf6-kguiaddons'...
$ git fetch origin ad97aa56f7660cf981498f450fe35da5530296c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kguiaddons
 * [new ref]         ad97aa56f7660cf981498f450fe35da5530296c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad97aa5 6.15.0