message: build: not refer at all
diff: @@ -10,12 +10,12 @@ def _default_envoy_api_impl(ctx):
  "tools",
  ]
  for d in api_dirs:
  - ctx.symlink(ctx.path(ctx.attr.api).dirname.get_child(d), d)
  + ctx.symlink(ctx.path(ctx.attr.envoy_root).dirname.get_child("api").get_child(d), d)
  _default_envoy_api = repository_rule(
  implementation = _default_envoy_api_impl,
  attrs = {
  - "api": attr.label(default = "@envoy//api:BUILD"),
  + "envoy_root": attr.label(default = "@envoy//:BUILD"),
  },
  )
  