Without this fix SR files fetched via slapos.recipe.build:download and
slapos.recipe.build:download-unpacked produce leat to error e.g. like

urlpath = '/SR-BASE/stack/erp5/instance-mariadb-resiliency-after-import-script.sh.in', kind = '', version = None

    def addbom(urlpath, kind, version=None):
        name, ver = namever(urlpath)
        if version is not None:
            assert ver is None
            ver = version
        ver = removeprefix(ver, name+'-')   # wendelin.core-2.0.alpha3-0-g6315384  -> 2.0.alpha3-0-g6315384
        if '//' in urlpath:
            url = urlpath
        else:
            if kind == 'egg':
                # XXX not strictly correct -> better retrieve the actual URL, but buildout does not save it in installed.cfg
                url = 'https://pypi.org/project/%s/%s/' % (name, ver)
            else:
>               raise NotImplementedError('TODO url for kind %r  (urlpath: %r)' % (kind, urlpath))
E               NotImplementedError: TODO url for kind ''  (urlpath: '/SR-BASE/stack/erp5/instance-mariadb-resiliency-after-import-script.sh.in')

nxdbom/__init__.py:64: NotImplementedError