# Copyright 2018 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/config/fuchsia/zbi.gni")
import("//build/images/boot.gni")
import("//build/images/custom_signing.gni")
import("//build/images/json.gni")
import("//build/images/manifest.gni")

declare_args() {
  # List of kernel command line arguments to bake into the Zedboot image.
  # See //zircon/docs/kernel_cmdline.md and
  # [`zedboot_devmgr_config`](#zedboot_devmgr_config).
  zedboot_cmdline_args = []

  # Files containing additional kernel command line arguments to bake into
  # the Zedboot image.  The contents of these files (in order) come after any
  # arguments directly in [`zedboot_cmdline_args`](#zedboot_cmdline_args).
  # These can be GN `//` source pathnames or absolute system pathnames.
  zedboot_cmdline_files = []

  # List of arguments to populate /boot/config/devmgr in the Zedboot image.
  zedboot_devmgr_config = [ "netsvc.netboot=true" ]
}

# This parallels the `images` list in //build/images/BUILD.gn, which see.
zedboot_images = []

# Construct a minimal manifest containing only the few user binaries
# that constitute zedboot, and the libraries they depend on.
# TODO(mcgrathr): This could be made smaller by constraining the drivers
# included, but we don't currently have a good way to determine the
# subset that is useful to Zedboot.
zedboot_binary_patterns = [
  # These are the core things needed for booting (local and netboot).
  "bin/devmgr",
  "bin/dlog",
  "bin/fshost",
  "bin/netsvc",
  "bin/svchost",
  "bin/virtual-console",
  "driver/*",  # Drivers automagically cause devhost to be brought in.

  # These are needed for installer runs.
  "bin/blobfs",
  "bin/install-disk-image",
  "bin/minfs",
  "bin/mount",

  # These are useful for debugging.
  "bin/dd",
  "bin/driverctl",
  "bin/fsck*",
  "bin/gpt",
  "bin/killall",
  "bin/lsblk",
  "bin/lsdev",
  "bin/lsusb",
  "bin/mkfs*",
  "bin/nand-util",
  "bin/netdump",
  "bin/ping",
  "bin/ps",
  "bin/sh",
  "bin/umount",
]

generate_manifest("zedboot.manifest") {
  visibility = [ ":*" ]
  args = []
  foreach(pattern, zedboot_binary_patterns) {
    args += [ "--binary=" + pattern ]
  }
}
manifest_outputs = get_target_outputs(":zedboot.manifest")
manifest_file = manifest_outputs[0]

action("devmgr_config.txt") {
  visibility = [ ":zbi" ]

  script = "../manifest.py"
  outputs = [
    "$target_out_dir/$target_name",
  ]

  args = [ "--output=" + rebase_path(outputs[0], root_build_dir) ]
  foreach(entry, zedboot_devmgr_config) {
    args += [ "--entry=$entry" ]
  }
}

zbi("zbi") {
  output_name = "zedboot"
  deps = [
    ":devmgr_config.txt",
    ":zedboot.manifest",
  ]
  inputs = [
    "${zircon_build_dir}/kernel.zbi",
    manifest_file,
  ]
  manifest = [
    {
      outputs = [
        "config/devmgr",
      ]
      sources = get_target_outputs(":devmgr_config.txt")
    },
  ]
  cmdline = zedboot_cmdline_args
  cmdline_inputs = zedboot_cmdline_files
}

zedboot_images += [
  {
    deps = [
      ":zbi",
    ]
    public = [
      "IMAGE_ZEDBOOT_ZBI",
      "IMAGE_ZIRCONR_ZBI",
    ]
    json = {
      name = "zircon-r"
      type = "zbi"
      if (custom_signing_script == "") {
        bootserver = [ "--zirconr" ]
      }
    }
  },
]

if (custom_signing_script != "") {
  custom_signed_zbi("signed") {
    output_name = "zedboot.zbi"
    deps = [
      ":zbi",
    ]
    zbi = get_target_outputs(":zbi")
  }

  zedboot_images += [
    {
      deps = [
        ":signed",
      ]
      public = [
        "IMAGE_ZIRCONR_SIGNEDZBI",
      ]
      json = {
        name = "zircon-r.signed"
        type = "zbi.signed"
        bootserver = [
          "--zirconr",

          # TODO(ZX-2625): `dm reboot-recovery` boots from
          # zircon-b instead of zircon-r, so put it there too.
          "--zirconb",
        ]
      }
    },
  ]
}

vboot("vboot") {
  output_name = "zedboot"
  deps = [
    ":zbi",
  ]
}

zedboot_images += [
  {
    deps = [
      ":vboot",
    ]
    public = [
      "IMAGE_ZEDBOOT_VBOOT",
    ]
    json = {
      name = "zedboot"
      type = "vboot"
    }
  },
]

if (target_cpu != "arm64") {
  esp("esp") {
    output_name = "zedboot"
    cmdline = "efi_cmdline.txt"
    deps = [
      ":zbi",
    ]
    zedboot_zbi_outputs = get_target_outputs(":zbi")
    zedboot = zedboot_zbi_outputs[0]
  }
  zedboot_images += [
    {
      deps = [
        ":esp",
      ]
      public = [
        "IMAGE_ZEDBOOT_ESP",
      ]
      json = {
        name = "zedboot-efi"
        type = "blk"
      }
    },
  ]
}

group("zedboot") {
  deps = [
    ":vboot",
    ":zbi",
  ]
  if (target_cpu != "arm64") {
    deps += [ ":esp" ]
  }
  if (custom_signing_script != "") {
    deps += [ ":signed" ]
  }
}

write_images_manifest("zedboot-manifest") {
  images = zedboot_images
  outputs = [
    "$root_build_dir/zedboot_images.json",
    "$root_build_dir/zedboot_image_paths.sh",
  ]
}