# Copyright 2022 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("//build/python/python_action.gni")

# Compares that the Image Assembly Config that's created by Product Assembly
# 'matches' that created by the 'legacy' mechanism, which uses the
# generated_image_assembly_config() template and GN metadata to find all the
# base, cache, and system pkgs, bootfs files, config data, etc.
#
# Arguments:
#
#   legacy_image_assembly_config
#    [path] This is the path to the image assembly config that is to be
#    compared with the generated one.
#
#   generated_image_assembly_config
#    [path] This is the path to the image assembly config that's generated by
#    product assembly.
#
#   product_assembly_config [optional]
#     [path] This is the path to the Product Assembly config that was used to
#     make 'generated_image_assembly_config'.  This is used to confirm that
#     items in 'generated_image_assembly_config' that aren't in
#     'legacy_image_assembly_config' are provided by the Product Assembly
#     config.
#
# GN Usual:
#   deps
#   public_deps
#   testonly
#   visibility

template("compare_image_assembly_configs") {
  python_action(target_name) {
    forward_variables_from(invoker,
                           [
                             "deps",
                             "public_deps",
                             "testonly",
                             "visibility",
                           ])

    assert(defined(invoker.legacy_image_assembly_config),
           "'legacy_image_assembly_config' must be defined")
    assert(defined(invoker.generated_image_assembly_config),
           "'generated_image_assembly_config' must be defined")

    # This reads a LOT of files to validate that the image assembly configs
    # point to manifests for the same package (as they may have different paths
    # but are the same merkles)
    hermetic_deps = false

    binary_label = "//build/assembly/scripts:compare_image_assembly_configs"

    inputs = [
      invoker.legacy_image_assembly_config,
      invoker.generated_image_assembly_config,
    ]
    outputs = [ "$target_out_dir/$target_name" ]
    args = [
      "--stamp",
      rebase_path(outputs[0], root_build_dir),
      "--legacy-image-assembly-config",
      rebase_path(invoker.legacy_image_assembly_config, root_build_dir),
      "--generated-image-assembly-config",
      rebase_path(invoker.generated_image_assembly_config, root_build_dir),
    ]

    if (defined(invoker.product_assembly_config)) {
      inputs += [ invoker.product_assembly_config ]
      args += [
        "--product-assembly-config",
        rebase_path(invoker.product_assembly_config, root_build_dir),
      ]
    }
  }
}