src/lib/fuchsia_nix/nix_visibility.gni

# Copyright 2021 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This build definition exists in order to define an allow-list of users of
# the nix third-party crate.  Currently and for the foreseeable future, the
# allow-list is limited to the fuchsia_nix in-tree crate, which selectively
# reexports (and provides test coverage for) those nix interfaces which:
#
# * have a concrete fuchsia use-case
# * have been shown to work on fuchsia
#
# In-tree users of the nix crate must do so indirectly through re-exported
# interfaces in fuchsia_nix. fuchsia_nix exists so that nix interfaces can be
# vetted as appropriate to Fuchsia OS principles, and validated as working on
# Fuchsia. For example, we do not want nix interfaces to POSIX signals to be
# available in-tree because signals do not exist on Fuchsia.

if (is_fuchsia) {
  nix_visibility = [ "//src/lib/fuchsia_nix:*" ]
} else {
  nix_visibility = [ "*" ]
}