# Copyright 2019 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/compiled_action.gni")
import("//build/config.gni")
import("//build/config/fuchsia/zbi.gni")
import("//build/config/fuchsia/zircon.gni")
import("//build/config/fuchsia/zircon_images.gni")
import("//build/images/bootfs_manifest_additions.gni")
import("//build/images/collect_blob_manifest.gni")
import("//build/images/fvm.gni")
import("//build/images/pkgfs.gni")
import("//build/images/shell_commands.gni")
import("//build/images/ta.gni")
import("//build/images/zxcrypt.gni")
import("//build/info/info.gni")
import("//build/package_metadata.gni")
import("//src/sys/pkg/bin/pm/pm.gni")

# Assembles a Fuchsia system.
#
# Given base, cache, and universe packages, assembles a Fuchsia system
# containing those packages.
#
# Parameters
#
#   base_packages (required)
#     [list of labels] The packages to include in the base package set.
#
#   cache_packages (optional)
#     [list of labels] The packages to cache in the images.
#
#   universe_packages (optional)
#     [list of labels] The packages to build in addition to the base and cache
#     sets. These packages do not contribute to the produced images directly,
#     however they may contribute to the config-data and shell-commands meta
#     packages.
#
#   netboot (default: false)
#     [boolean] Whether the generated ZBI should contain the entire system.
#
#   devmgr_config (default: [])
#     [list of strings] List of arguments to add to /boot/config/devmgr.
#     These arguments come after synthesized arguments to configure blobfs and
#     pkgfs.
#
#   ta_uuids (default: [])
#     [list of strings] UUIDs of Trusted Applications to include in the system
#     image.
#
#   cmdline (optional)
#     [list of strings] Kernel command line text.
#
#   cmdline_inputs (optional)
#     [list of files] Input files treated as kernel command line text.
#
#   compress_blobs (default: true)
#     [boolean] Whether the blobs added to the blobfs image should be compressed.
#
#   output_dir (optional; default: target_out_dir)
#     [string] The output directory into which the final system ZBI is written.
template("assemble_system") {
  base_packages = invoker.base_packages
  cache_packages = []
  universe_packages = []
  if (defined(invoker.cache_packages)) {
    cache_packages = invoker.cache_packages
  }
  if (defined(invoker.universe_packages)) {
    universe_packages = invoker.universe_packages
  }

  # Must be unique among assembled systems.
  image_name = target_name

  netboot = false
  if (defined(invoker.netboot)) {
    netboot = invoker.netboot
  }

  compress_blobs = true
  if (defined(invoker.compress_blobs)) {
    compress_blobs = invoker.compress_blobs
  }

  devmgr_config = []
  if (defined(invoker.devmgr_config)) {
    devmgr_config = invoker.devmgr_config
  }

  shell_commands("${target_name}_shell-commands") {
    package_name = "shell-commands"
    testonly = true
    visibility = [ ":*" ]
    deps = base_packages + cache_packages + universe_packages
  }

  config_package("${image_name}_config-data") {
    package_name = "config-data"
    testonly = true
    visibility = [ ":*" ]
    deps = base_packages + cache_packages + universe_packages
  }

  group("${image_name}_base_packages") {
    testonly = true
    visibility = [ ":*" ]
    deps = base_packages + [
             ":${image_name}_config-data",
             ":${image_name}_shell-commands",
             pkgfs_package_label,
           ]
  }

  meta_far_merkle_index = "$target_out_dir/${image_name}_meta_far_merkle_index"
  generate_package_metadata("${image_name}_meta_far_merkle_index") {
    testonly = true
    visibility = [ ":*" ]
    outputs = [ meta_far_merkle_index ]
    data_keys = [ "meta_far_merkle_index_entries" ]
    deps = [ ":${image_name}_base_packages" ]
  }

  action("${image_name}_pkgsvr_index") {
    visibility = [ ":*" ]
    testonly = true
    inputs = [ meta_far_merkle_index ]
    outputs = [ "$target_out_dir/${target_name}" ]
    deps = [ ":${image_name}_meta_far_merkle_index" ]
    script = "//build/images/manifest_content_expand.sh"
    args = rebase_path(inputs, root_build_dir) +
           rebase_path(outputs, root_build_dir)
  }

  system_image_manifest_args =
      "$target_out_dir/${image_name}_system_image.manifest_args"
  generated_file("${image_name}_system_image.manifest_args") {
    visibility = [ ":*" ]
    testonly = true
    outputs = [ system_image_manifest_args ]
    data_keys = [ "system_image_rsps" ]
    walk_keys = [ "system_image_barrier" ]
    deps = [ ":${image_name}_base_packages" ]
  }

  boot_manifest = "$target_out_dir/${image_name}.boot.manifest"

  generate_manifest("${image_name}_system_image.manifest") {
    visibility = [ ":*" ]
    testonly = true

    bootfs_manifest = boot_manifest
    bootfs_zircon_groups = "all"
    bootfs_allowlist = []
    if (defined(invoker.bootfs_allowlist)) {
      bootfs_allowlist = invoker.bootfs_allowlist
    }

    deps = [
      ":${image_name}_pkgsvr_index",
      ":${image_name}_system_image.manifest_args",
    ]
    json = "//build/images/system_meta_package.json"
    pkgsvr_index = get_target_outputs(":${image_name}_pkgsvr_index")

    sources = [
      json,
      pkgsvr_index[0],
      system_image_manifest_args,
    ]
    args = [
      "@" + rebase_path(system_image_manifest_args, root_build_dir),
      "--entry=meta/package=" + rebase_path(json, root_build_dir),
      "--entry=data/static_packages=" +
          rebase_path(pkgsvr_index[0], root_build_dir),
    ]

    # Inject virtcon into the system image.
    # TODO(41410): Remove when unified build exists.
    deps += [ "//src/bringup/virtcon:virtual-console" ]
    args += [ "--entry=bin/virtual-console=" +
              rebase_path("$root_build_dir/virtual-console", root_build_dir) ]
  }

  system_manifest_outputs =
      get_target_outputs(":${image_name}_system_image.manifest")
  assert(boot_manifest == system_manifest_outputs[2])

  pm_build("${image_name}_system_image.meta") {
    visibility = [ ":*" ]
    testonly = true
    manifest = ":${image_name}_system_image.manifest"
    package_name = "system_image"
  }

  blob_manifest = "$target_out_dir/${image_name}_blob.manifest"
  collect_blob_manifest("${image_name}_blob.manifest") {
    testonly = true
    visibility = [ ":*" ]
    outputs = [ blob_manifest ]
    deps = [
      ":${image_name}_base_packages",
      ":${image_name}_system_image.meta",
      pkgfs_package_label,
    ]
  }

  compiled_action("${image_name}_blob.blk") {
    visibility = [ ":*" ]
    testonly = true
    deps = [ ":${image_name}_blob.manifest" ]
    blob_image_path = "$target_out_dir/$target_name"
    blob_size_list = "$target_out_dir/${image_name}_blobs.json"
    outputs = [ blob_image_path ]
    depfile = blob_image_path + ".d"
    inputs = [ blob_manifest ]
    tool = "//zircon/tools/blobfs"
    args = [
      "--depfile",
      "--json-output",
      rebase_path(blob_size_list, root_build_dir),
    ]
    if (compress_blobs) {
      args += [ "--compress" ]
    }
    args += [
      rebase_path(blob_image_path, root_build_dir),
      "create",
      "--manifest",
      rebase_path(blob_manifest, root_build_dir),
    ]
  }

  compiled_action("${image_name}_data.blk") {
    data_image_path = "$target_out_dir/${target_name}"
    visibility = [ ":*" ]
    testonly = true
    outputs = [ data_image_path ]
    tool = "//zircon/tools/minfs"
    args = [
      rebase_path(data_image_path, root_build_dir),
      "create",
    ]
  }

  generate_fvm("${image_name}_fvm.blk") {
    # Referenced by guest_package.
    testonly = true
    output_name = "$target_out_dir/$target_name"
    args = fvm_create_args
    partitions = [
      {
        type = "blob"
        dep = ":${image_name}_blob.blk"
      },
      {
        type = "data"
        dep = ":${image_name}_data.blk"
      },
    ]
  }

  action("${image_name}_devmgr_config.txt") {
    visibility = [ ":*" ]
    testonly = true
    script = "//build/images/manifest.py"
    outputs = [ "$target_out_dir/$target_name" ]
    args = [ "--output=" + rebase_path(outputs[0], root_build_dir) ]
    sources = []
    deps = [ ":${image_name}_system_image.manifest" ]

    pkgfs = "bin/" + pkgfs_binary_name
    pkgfs_label = pkgfs_package_label
    pkgfs_pkg_out_dir = get_label_info(pkgfs_label, "target_out_dir") + "/" +
                        get_label_info(pkgfs_label, "name")
    pkgfs_blob_manifest = "$pkgfs_pkg_out_dir/meta/contents"
    system_image_merkleroot =
        "$target_out_dir/${image_name}_system_image.meta/meta.far.merkle"

    deps += [
      ":${image_name}_system_image.meta",
      pkgfs_label,
    ]

    sources += [
      pkgfs_blob_manifest,
      system_image_merkleroot,
    ]

    args += [
      "--entry=devmgr.require-system=true",

      "--contents",
      "--rewrite=*=zircon.system.pkgfs.cmd={target}+{source}",
      "--entry=${pkgfs}=" +
          rebase_path(system_image_merkleroot, root_build_dir),
      "--no-contents",
      "--reset-rewrite",

      "--rewrite=*=zircon.system.pkgfs.file.{target}={source}",
      "--manifest=" + rebase_path(pkgfs_blob_manifest, root_build_dir),
      "--reset-rewrite",
    ]

    # Add the backstop UTC value from the integration repo latest commit
    args += [
      "--contents",
      "--entry=clock.backstop=" +
          rebase_path(build_info_files.minimum_utc_stamp, root_build_dir),
      "--no-contents",
      "--reset-rewrite",
    ]

    foreach(entry, devmgr_config) {
      args += [ "--entry=$entry" ]
    }

    # If there were any ASan drivers in the build, bin/devhost.asan
    # should have been brought into the boot manifest.  devmgr needs to
    # be told to use it in case there are ASan drivers in /system but
    # none in /boot.  If there were any non-ASan drivers in the build,
    # bin/devhost.asan will load them and needs to know to moderate the
    # checking for interacting with uninstrumented code.
    sources += [ boot_manifest ]
    args += [
      "--include=bin/devhost",
      "--manifest=" + rebase_path(boot_manifest, root_build_dir),
    ]
  }

  generated_file("${image_name}_zxcrypt_config.txt") {
    outputs = [ "$target_out_dir/$target_name" ]
    contents = zxcrypt_key_source
  }

  additional_manifests = []
  foreach(label, bootfs_manifest_additions) {
    target_dir = get_label_info(label, "target_out_dir")
    target_name = get_label_info(label, "name")
    additional_manifests += [ target_dir + "/" + target_name ]
  }

  zbi(image_name) {
    metadata = {
      # We insert a package barrier because the packages inside this ZBI
      # shouldn't leak to targets that depend on the ZBI. For example,
      # suppose we store this ZBI inside a package() that is assembled into
      # another Fuchsia system. We don't want the parent system to incorporate
      # the packages from the ZBI into its own package list.
      package_barrier = []
      config_package_barrier = []

      if (defined(invoker.metadata)) {
        forward_variables_from(invoker.metadata, "*")
      }
    }

    output_dir = target_out_dir
    if (defined(invoker.output_dir)) {
      output_dir = invoker.output_dir
    }

    forward_variables_from(invoker,
                           [
                             "cmdline",
                             "cmdline_inputs",
                           ])

    testonly = true
    deps = [
             ":${image_name}_devmgr_config.txt",
             ":${image_name}_fvm.blk",
             ":${image_name}_system_image.manifest",
             ":${image_name}_zxcrypt_config.txt",
           ] + bootfs_manifest_additions
    inputs = [
               boot_manifest,
               zircon_kernel_zbi,
             ] + additional_manifests
    manifest = [
      {
        outputs = [ "config/devmgr" ]
        sources = get_target_outputs(":${image_name}_devmgr_config.txt")
      },
      {
        outputs = [ "config/zxcrypt" ]
        sources = get_target_outputs(":${image_name}_zxcrypt_config.txt")
      },
    ]

    if (defined(invoker.ta_uuids)) {
      foreach(ta_uuid, invoker.ta_uuids) {
        manifest += [
          {
            outputs = [ "lib/firmware/$ta_uuid$ta_dest_suffix" ]
            sources = [ rebase_path("$ta_path/$ta_uuid$ta_src_suffix") ]
          },
        ]
      }
    }

    if (netboot) {
      ramdisk_inputs = get_target_outputs(":${image_name}_fvm.blk")
    }
  }
}