$ git clone -n https://src.fedoraproject.org/rpms/kiwi-boxed-plugin.git /var/lib/mock/f42-build-side-1-3498688-45963/root/chroot_tmpdir/scmroot/kiwi-boxed-plugin
Cloning into '/var/lib/mock/f42-build-side-1-3498688-45963/root/chroot_tmpdir/scmroot/kiwi-boxed-plugin'...
$ git fetch origin e6eaec97f4b60ecd970fce46f78927ec9ffce4bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kiwi-boxed-plugin
 * [new ref]         e6eaec97f4b60ecd970fce46f78927ec9ffce4bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6eaec9 Update to 0.2.52