# 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.

import("fuchsia_package.gni")

# Defines a Fuchsia package that contains binaries or resources to be
# part of the Fuchsia system image (i.e. copied to /system/...).
#
# Such packages should not contain any component, and should be
# reachable from the //build/input:system_image target, and optionally
# for //build/images:base_packages and //build/images:meta_packages.
#
# System packages should be rare, and can be added to the system image in
# two different ways:
#
#   1) By adding them to the //build/input:system_image dependency tree,
#      which should _only_ list fuchsia_system_package() intances. The
#      build will complain if it finds a non-driver fuchsia_package()
#      there.
#
#   2) By adding them to the //build/images:base_packages or
#      //build/images:meta_packages dependency trees. This is useful when
#      a base package requires the content of a specific extra
#      fuchsia_system_package() to be installed in the system image as well.
#
#      Such a package instance must set the "allowed_in_extra_deps" parameter
#      below. The build system will complain if it finds an unmarked extra
#      fuchsia_system_package() in this set.
#
# Parameters:
#
#   package_name (optional)
#     The name of the package.
#     Type: string
#     Default: target_name
#
#   allowed_in_extra_deps (optional)
#     Set to true to allow this package to be part of extra dependency
#     trees used to build the system image. This is useful when this
#     package is required by another base or meta package, but shouldn't
#     be part of the default system image dependency tree otherwise.
#
#   deps
#   testonly
#   visibility
#
#
template("fuchsia_system_package") {
  fuchsia_package(target_name) {
    forward_variables_from(invoker,
                           "*",
                           [
                             "allowed_in_extra_deps",
                             "disable_elf_binaries_check",
                             "testonly",
                             "visibility",
                           ])
    forward_variables_from(invoker,
                           [
                             "testonly",
                             "visibility",
                           ])

    system_image_package_allowed_in_extra_deps =
        defined(invoker.allowed_in_extra_deps) && invoker.allowed_in_extra_deps
  }
}