src/sys/component_index/component_index.gni

# Copyright 2020 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.

# Generates a list of fuchsia-pkg URLs for component from all packages in the
# transitive closure of declared dependencies.
#
# Parameters
#
#   data_deps (optional)
#   deps (optional)
#   outputs (optional)
#   public_deps (optional)
#   testonly (optional)
#   visibility (optional)
#     Same as for any GN `generated_file()` target.
template("generate_component_index") {
  generated_file(target_name) {
    forward_variables_from(invoker,
                           [
                             "data_deps",
                             "deps",
                             "outputs",
                             "public_deps",
                             "testonly",
                             "visibility",
                           ])
    data_keys = [ "component_index" ]
    walk_keys = [ "component_index_barrier" ]
  }
}

# Adds a component URL to the component index.
#
# The caller should add a dep on the given target name for the metadata to take effect.
#
# Parameters
#
#   package_name (required)
#   manifest (required)
template("add_to_component_index") {
  assert(defined(invoker.package_name), "Missing package_name")
  assert(defined(invoker.manifest), "Missing manifest")

  group(target_name) {
    metadata = {
      component_index = [
        "fuchsia-pkg://fuchsia.com/${invoker.package_name}#${invoker.manifest}",
      ]
    }
  }
}