def _wrap_json_properties_impl(ctx):  content = ctx.read(ctx.attr.src)  bzl = "PROPERTIES = %s" % (content)  ctx.file("BUILD", content = "", executable = False)  ctx.file("properties.bzl", content = bzl, executable = False) wrap_json_properties = repository_rule(  attrs = {    "src": attr.label(mandatory = True),  },  implementation = _wrap_json_properties_impl,)