# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Module containing stages that generate and/or archive artifacts."""

from __future__ import print_function

import glob
import itertools
import json
import logging
import multiprocessing
import os
import shutil

from chromite.cbuildbot import commands
from chromite.cbuildbot import failures_lib
from chromite.cbuildbot import cbuildbot_config
from chromite.cbuildbot import constants
from chromite.cbuildbot import prebuilts
from chromite.cbuildbot.stages import generic_stages
from chromite.lib import cros_build_lib
from chromite.lib import git
from chromite.lib import osutils
from chromite.lib import parallel
from chromite.lib import portage_util


_FULL_BINHOST = 'FULL_BINHOST'
_PORTAGE_BINHOST = 'PORTAGE_BINHOST'


class NothingToArchiveException(Exception):
  """Thrown if ArchiveStage found nothing to archive."""
  def __init__(self, message='No images found to archive.'):
    super(NothingToArchiveException, self).__init__(message)


class ArchiveStage(generic_stages.BoardSpecificBuilderStage,
                   generic_stages.ArchivingStageMixin):
  """Archives build and test artifacts for developer consumption.

  Attributes:
    release_tag: The release tag. E.g. 2981.0.0
    version: The full version string, including the milestone.
        E.g. R26-2981.0.0-b123
  """

  option_name = 'archive'
  config_name = 'archive'

  # This stage is intended to run in the background, in parallel with tests.
  def __init__(self, builder_run, board, chrome_version=None, **kwargs):
    super(ArchiveStage, self).__init__(builder_run, board, **kwargs)
    self.chrome_version = chrome_version

    # TODO(mtennant): Places that use this release_tag attribute should
    # move to use self._run.attrs.release_tag directly.
    self.release_tag = getattr(self._run.attrs, 'release_tag', None)

    self._recovery_image_status_queue = multiprocessing.Queue()
    self._release_upload_queue = multiprocessing.Queue()
    self._upload_queue = multiprocessing.Queue()
    self.artifacts = []

  def WaitForRecoveryImage(self):
    """Wait until artifacts needed by SignerTest stage are created.

    Returns:
      True if artifacts created successfully.
      False otherwise.
    """
    cros_build_lib.Info('Waiting for recovery image...')
    status = self._recovery_image_status_queue.get()
    # Put the status back so other SignerTestStage instances don't starve.
    self._recovery_image_status_queue.put(status)
    return status

  @staticmethod
  def SingleMatchGlob(path_pattern):
    """Returns the last match (after sort) if multiple found."""
    files = glob.glob(path_pattern)
    files.sort()
    if not files:
      raise NothingToArchiveException('No %s found!' % path_pattern)
    elif len(files) > 1:
      cros_build_lib.PrintBuildbotStepWarnings()
      cros_build_lib.Warning('Expecting one result for %s package, but '
                             'found multiple.', path_pattern)
    return files[-1]

  def ArchiveStrippedChrome(self):
    """Generate and upload stripped Chrome package."""

    # If chrome is not installed, skip archiving.
    chroot_path = os.path.join(self._build_root, constants.DEFAULT_CHROOT_DIR)
    board_path = os.path.join(chroot_path, 'build', self._current_board)
    if not portage_util.IsPackageInstalled(constants.CHROME_CP,
                                           board_path):
      return

    cmd = ['strip_package', '--board', self._current_board,
           constants.CHROME_PN]
    cros_build_lib.RunCommand(cmd, cwd=self._build_root, enter_chroot=True)
    pkg_dir = os.path.join(
        self._build_root, constants.DEFAULT_CHROOT_DIR, 'build',
        self._current_board, 'stripped-packages')
    chrome_tarball = self.SingleMatchGlob(
        os.path.join(pkg_dir, constants.CHROME_CP) + '-*')
    filename = os.path.basename(chrome_tarball)
    os.link(chrome_tarball, os.path.join(self.archive_path, filename))
    self._upload_queue.put([filename])

  def BuildAndArchiveDeltaSysroot(self):
    """Generate and upload delta sysroot for initial build_packages."""
    extra_env = {}
    if self._run.config.useflags:
      extra_env['USE'] = ' '.join(self._run.config.useflags)
    in_chroot_path = git.ReinterpretPathForChroot(self.archive_path)
    cmd = ['generate_delta_sysroot', '--out-dir', in_chroot_path,
           '--board', self._current_board]
    # TODO(mtennant): Make this condition into one run param.
    if not self._run.config.build_tests or not self._run.options.tests:
      cmd.append('--skip-tests')
    cros_build_lib.RunCommand(cmd, cwd=self._build_root, enter_chroot=True,
                              extra_env=extra_env)
    self._upload_queue.put([constants.DELTA_SYSROOT_TAR])

  def LoadArtifactsList(self, board, image_dir):
    """Load the list of artifacts to upload for this board.

    It attempts to load a JSON file, scripts/artifacts.json, from the
    overlay directories for this board. This file specifies the artifacts
    to generate, if it can't be found, it will use a default set that
    uploads every .bin file as a .tar.xz file except for
    chromiumos_qemu_image.bin.

    See BuildStandaloneArchive in cbuildbot_commands.py for format docs.
    """
    custom_artifacts_file = portage_util.ReadOverlayFile(
        'scripts/artifacts.json', board=board)
    artifacts = None

    if custom_artifacts_file is not None:
      json_file = json.loads(custom_artifacts_file)
      artifacts = json_file.get('artifacts')

    if artifacts is None:
      artifacts = []
      for image_file in glob.glob(os.path.join(image_dir, '*.bin')):
        basename = os.path.basename(image_file)
        if basename != constants.VM_IMAGE_BIN:
          info = {'input': [basename], 'archive': 'tar', 'compress': 'xz'}
          artifacts.append(info)

    for artifact in artifacts:
      # Resolve the (possible) globs in the input list, and store
      # the actual set of files to use in 'paths'
      paths = []
      for s in artifact['input']:
        glob_paths = glob.glob(os.path.join(image_dir, s))
        if not glob_paths:
          logging.warning('No artifacts generated for input: %s', s)
        else:
          for path in glob_paths:
            paths.append(os.path.relpath(path, image_dir))
      artifact['paths'] = paths
    self.artifacts = artifacts

  def IsArchivedFile(self, filename):
    """Return True if filename is the name of a file being archived."""
    for artifact in self.artifacts:
      for path in itertools.chain(artifact['paths'], artifact['input']):
        if os.path.basename(path) == filename:
          return True
    return False

  def PerformStage(self):
    buildroot = self._build_root
    config = self._run.config
    board = self._current_board
    debug = self._run.debug
    upload_url = self.upload_url
    archive_path = self.archive_path
    image_dir = self.GetImageDirSymlink()

    extra_env = {}
    if config['useflags']:
      extra_env['USE'] = ' '.join(config['useflags'])

    if not archive_path:
      raise NothingToArchiveException()

    # The following functions are run in parallel (except where indicated
    # otherwise)
    # \- BuildAndArchiveArtifacts
    #    \- ArchiveReleaseArtifacts
    #       \- ArchiveFirmwareImages
    #       \- BuildAndArchiveAllImages
    #          (builds recovery image first, then launches functions below)
    #          \- BuildAndArchiveFactoryImages
    #          \- ArchiveStandaloneArtifacts
    #             \- ArchiveStandaloneArtifact
    #          \- ArchiveZipFiles
    #          \- ArchiveHWQual
    #       \- PushImage (blocks on BuildAndArchiveAllImages)
    #    \- ArchiveManifest
    #    \- ArchiveStrippedChrome
    #    \- ArchiveImageScripts

    def ArchiveManifest():
      """Create manifest.xml snapshot of the built code."""
      output_manifest = os.path.join(archive_path, 'manifest.xml')
      cmd = ['repo', 'manifest', '-r', '-o', output_manifest]
      cros_build_lib.RunCommand(cmd, cwd=buildroot, capture_output=True)
      self._upload_queue.put(['manifest.xml'])

    def BuildAndArchiveFactoryImages():
      """Build and archive the factory zip file.

      The factory zip file consists of the factory toolkit and the factory
      install image. Both are built here.
      """
      # Build factory install image and create a symlink to it.
      factory_install_symlink = None
      if 'factory_install' in config['images']:
        alias = commands.BuildFactoryInstallImage(buildroot, board, extra_env)
        factory_install_symlink = self.GetImageDirSymlink(alias)
        if config['factory_install_netboot']:
          commands.MakeNetboot(buildroot, board, factory_install_symlink)

      # Build the factory toolkit.
      chroot_dir = os.path.join(buildroot, constants.DEFAULT_CHROOT_DIR)
      chroot_tmp_dir = os.path.join(chroot_dir, 'tmp')
      with osutils.TempDir(base_dir=chroot_tmp_dir, sudo_rm=True) as tempdir:
        # Build the factory toolkit.
        if config['factory_toolkit']:
          toolkit_dir = os.path.join(tempdir, 'factory_toolkit')
          os.makedirs(toolkit_dir)
          commands.MakeFactoryToolkit(
              buildroot, board, toolkit_dir, self._run.attrs.release_tag)

        # Build and upload factory zip if needed.
        if factory_install_symlink or config['factory_toolkit']:
          filename = commands.BuildFactoryZip(
              buildroot, board, archive_path, factory_install_symlink,
              toolkit_dir, self._run.attrs.release_tag)
          self._release_upload_queue.put([filename])

    def ArchiveStandaloneArtifact(artifact_info):
      """Build and upload a single archive."""
      if artifact_info['paths']:
        for path in commands.BuildStandaloneArchive(archive_path, image_dir,
                                                    artifact_info):
          self._release_upload_queue.put([path])

    def ArchiveStandaloneArtifacts():
      """Build and upload standalone archives for each image."""
      if config['upload_standalone_images']:
        parallel.RunTasksInProcessPool(ArchiveStandaloneArtifact,
                                       [[x] for x in self.artifacts])

    def ArchiveZipFiles():
      """Build and archive zip files.

      This includes:
        - image.zip (all images in one big zip file)
        - the au-generator.zip used for update payload generation.
      """
      # Zip up everything in the image directory.
      image_zip = commands.BuildImageZip(archive_path, image_dir)
      self._release_upload_queue.put([image_zip])

      # Archive au-generator.zip.
      filename = 'au-generator.zip'
      shutil.copy(os.path.join(image_dir, filename), archive_path)
      self._release_upload_queue.put([filename])

    def ArchiveHWQual():
      """Build and archive the HWQual images."""
      # TODO(petermayo): This logic needs to be exported from the BuildTargets
      # stage rather than copied/re-evaluated here.
      # TODO(mtennant): Make this autotest_built concept into a run param.
      autotest_built = (config['build_tests'] and self._run.options.tests and
                        config['upload_hw_test_artifacts'])

      if config['hwqual'] and autotest_built:
        # Build the full autotest tarball for hwqual image. We don't upload it,
        # as it's fairly large and only needed by the hwqual tarball.
        cros_build_lib.Info('Archiving full autotest tarball locally ...')
        tarball = commands.BuildFullAutotestTarball(self._build_root,
                                                    self._current_board,
                                                    image_dir)
        commands.ArchiveFile(tarball, archive_path)

        # Build hwqual image and upload to Google Storage.
        hwqual_name = 'chromeos-hwqual-%s-%s' % (board, self.version)
        filename = commands.ArchiveHWQual(buildroot, hwqual_name, archive_path,
                                          image_dir)
        self._release_upload_queue.put([filename])

    def ArchiveFirmwareImages():
      """Archive firmware images built from source if available."""
      archive = commands.BuildFirmwareArchive(buildroot, board, archive_path)
      if archive:
        self._release_upload_queue.put([archive])

    def BuildAndArchiveAllImages():
      # Generate the recovery image. To conserve loop devices, we try to only
      # run one instance of build_image at a time. TODO(davidjames): Move the
      # image generation out of the archive stage.
      self.LoadArtifactsList(self._current_board, image_dir)

      # For recovery image to be generated correctly, BuildRecoveryImage must
      # run before BuildAndArchiveFactoryImages.
      if self.IsArchivedFile(constants.BASE_IMAGE_BIN):
        commands.BuildRecoveryImage(buildroot, board, image_dir, extra_env)
        self._recovery_image_status_queue.put(True)
        # Re-generate the artifacts list so we include the newly created
        # recovery image.
        self.LoadArtifactsList(self._current_board, image_dir)

      if config['images']:
        parallel.RunParallelSteps([BuildAndArchiveFactoryImages,
                                   ArchiveHWQual,
                                   ArchiveStandaloneArtifacts,
                                   ArchiveZipFiles])

    def ArchiveImageScripts():
      """Archive tarball of generated image manipulation scripts."""
      target = os.path.join(archive_path, constants.IMAGE_SCRIPTS_TAR)
      files = glob.glob(os.path.join(image_dir, '*.sh'))
      files = [os.path.basename(f) for f in files]
      cros_build_lib.CreateTarball(target, image_dir, inputs=files)
      self._upload_queue.put([constants.IMAGE_SCRIPTS_TAR])

    def PushImage():
      # This helper script is only available on internal manifests currently.
      if not config['internal']:
        return

      self.GetParallel('debug_tarball_generated', pretty_name='debug tarball')

      # Now that all data has been generated, we can upload the final result to
      # the image server.
      # TODO: When we support branches fully, the friendly name of the branch
      # needs to be used with PushImages
      sign_types = []
      if config['name'].endswith('-%s' % cbuildbot_config.CONFIG_TYPE_FIRMWARE):
        sign_types += ['firmware']
      urls = commands.PushImages(
          board=board,
          archive_url=upload_url,
          dryrun=debug or not config['push_image'],
          profile=self._run.options.profile or config['profile'],
          sign_types=sign_types)
      self.board_runattrs.SetParallel('instruction_urls_per_channel', urls)

    def ArchiveReleaseArtifacts():
      with self.ArtifactUploader(self._release_upload_queue, archive=False):
        steps = [BuildAndArchiveAllImages, ArchiveFirmwareImages]
        parallel.RunParallelSteps(steps)
      PushImage()

    def BuildAndArchiveArtifacts():
      # Run archiving steps in parallel.
      steps = [ArchiveReleaseArtifacts, ArchiveManifest]
      if config['images']:
        steps.extend([self.ArchiveStrippedChrome, ArchiveImageScripts])
      if config['create_delta_sysroot']:
        steps.append(self.BuildAndArchiveDeltaSysroot)

      with self.ArtifactUploader(self._upload_queue, archive=False):
        parallel.RunParallelSteps(steps)

    if not self._run.config.afdo_generate_min:
      BuildAndArchiveArtifacts()

  def _HandleStageException(self, exc_info):
    # Tell the HWTestStage not to wait for artifacts to be uploaded
    # in case ArchiveStage throws an exception.
    self._recovery_image_status_queue.put(False)
    self.board_runattrs.SetParallel('instruction_urls_per_channel', None)
    return super(ArchiveStage, self)._HandleStageException(exc_info)


class CPEExportStage(generic_stages.BoardSpecificBuilderStage,
                     generic_stages.ArchivingStageMixin):
  """Handles generation & upload of package CPE information."""

  config_name = 'cpe_export'

  @failures_lib.SetFailureType(failures_lib.InfrastructureFailure)
  def PerformStage(self):
    """Generate debug symbols and upload debug.tgz."""
    buildroot = self._build_root
    board = self._current_board
    useflags = self._run.config.useflags

    logging.info('Generating CPE export.')
    result = commands.GenerateCPEExport(buildroot, board, useflags)

    logging.info('Writing CPE export to files for archive.')
    warnings_filename = os.path.join(self.archive_path,
                                     'cpe-warnings-chromeos-%s.txt' % board)
    results_filename = os.path.join(self.archive_path,
                                    'cpe-chromeos-%s.json' % board)

    osutils.WriteFile(warnings_filename, result.error)
    osutils.WriteFile(results_filename, result.output)

    logging.info('Uploading CPE files.')
    self.UploadArtifact(os.path.basename(warnings_filename), archive=False)
    self.UploadArtifact(os.path.basename(results_filename), archive=False)


class DebugSymbolsStage(generic_stages.BoardSpecificBuilderStage,
                        generic_stages.ArchivingStageMixin):
  """Handles generation & upload of debug symbols."""

  config_name = 'debug_symbols'

  @failures_lib.SetFailureType(failures_lib.InfrastructureFailure)
  def PerformStage(self):
    """Generate debug symbols and upload debug.tgz."""
    buildroot = self._build_root
    board = self._current_board

    commands.GenerateBreakpadSymbols(buildroot, board, self._run.debug)
    self.board_runattrs.SetParallel('breakpad_symbols_generated', True)

    steps = [self.UploadDebugTarball]
    failed_list = os.path.join(self.archive_path, 'failed_upload_symbols.list')
    if self._run.config.upload_symbols:
      steps.append(lambda: self.UploadSymbols(buildroot, board, failed_list))

    parallel.RunParallelSteps(steps)

  def UploadDebugTarball(self):
    """Generate and upload the debug tarball."""
    filename = commands.GenerateDebugTarball(
        self._build_root, self._current_board, self.archive_path,
        self._run.config.archive_build_debug)
    self.UploadArtifact(filename, archive=False)
    cros_build_lib.Info('Announcing availability of debug tarball now.')
    self.board_runattrs.SetParallel('debug_tarball_generated', True)

  def UploadSymbols(self, buildroot, board, failed_list):
    """Upload generated debug symbols."""
    if self._run.options.remote_trybot or self._run.debug:
      # For debug builds, limit ourselves to just uploading 1 symbol.
      # This way trybots and such still exercise this code.
      cnt = 1
      official = False
    else:
      cnt = None
      official = self._run.config.chromeos_official

    commands.UploadSymbols(buildroot, board, official, cnt, failed_list)

    if os.path.exists(failed_list):
      self.UploadArtifact(os.path.basename(failed_list), archive=False)

  def _SymbolsNotGenerated(self):
    """Tell other stages that our symbols were not generated."""
    self.board_runattrs.SetParallelDefault('breakpad_symbols_generated', False)
    self.board_runattrs.SetParallelDefault('debug_tarball_generated', False)

  def HandleSkip(self):
    """Tell other stages to not wait on us if we are skipped."""
    self._SymbolsNotGenerated()
    return super(DebugSymbolsStage, self).HandleSkip()

  def _HandleStageException(self, exc_info):
    """Tell other stages to not wait on us if we die for some reason."""
    self._SymbolsNotGenerated()
    return super(DebugSymbolsStage, self)._HandleStageException(exc_info)


class MasterUploadPrebuiltsStage(generic_stages.BuilderStage):
  """Syncs prebuilt binhost files across slaves."""
  # TODO(mtennant): This class represents logic spun out from
  # UploadPrebuiltsStage that is specific to a master builder. This is
  # currently used by the Commit Queue and the Master PFQ builder, but
  # could be used by other master builders that upload prebuilts,
  # e.g., x86-alex-pre-flight-branch. When completed the
  # UploadPrebuiltsStage code can be thinned significantly.
  option_name = 'prebuilts'
  config_name = 'prebuilts'

  def _GenerateCommonArgs(self):
    """Generate common prebuilt arguments."""
    generated_args = []
    if self._run.options.debug:
      generated_args.extend(['--debug', '--dry-run'])

    profile = self._run.options.profile or self._run.config['profile']
    if profile:
      generated_args.extend(['--profile', profile])

    # Generate the version if we are a manifest_version build.
    if self._run.config.manifest_version:
      version = self._run.GetVersion()
      generated_args.extend(['--set-version', version])

    return generated_args

  @staticmethod
  def _AddOptionsForSlave(slave_config):
    """Private helper method to add upload_prebuilts args for a slave builder.

    Args:
      slave_config: The build config of a slave builder.

    Returns:
      An array of options to add to upload_prebuilts array that allow a master
      to submit prebuilt conf modifications on behalf of a slave.
    """
    args = []
    if slave_config['prebuilts']:
      for slave_board in slave_config['boards']:
        args.extend(['--slave-board', slave_board])
        slave_profile = slave_config['profile']
        if slave_profile:
          args.extend(['--slave-profile', slave_profile])

    return args

  @failures_lib.SetFailureType(failures_lib.InfrastructureFailure)
  def PerformStage(self):
    """Syncs prebuilt binhosts for slave builders."""
    # Common args we generate for all types of builds.
    generated_args = self._GenerateCommonArgs()
    # Args we specifically add for public/private build types.
    public_args, private_args = [], []
    # Gather public/private (slave) builders.
    public_builders, private_builders = [], []

    # Distributed builders that use manifest-versions to sync with one another
    # share prebuilt logic by passing around versions.
    assert cbuildbot_config.IsPFQType(self._prebuilt_type)

    # Public pfqs should upload host preflight prebuilts.
    public_args.append('--sync-host')

    # Update all the binhost conf files.
    generated_args.append('--sync-binhost-conf')
    for slave_config in self._GetSlaveConfigs():
      if slave_config['prebuilts'] == constants.PUBLIC:
        public_builders.append(slave_config['name'])
        public_args.extend(self._AddOptionsForSlave(slave_config))
      elif slave_config['prebuilts'] == constants.PRIVATE:
        private_builders.append(slave_config['name'])
        private_args.extend(self._AddOptionsForSlave(slave_config))

    # Upload the public prebuilts, if any.
    if public_builders:
      prebuilts.UploadPrebuilts(
          category=self._prebuilt_type, chrome_rev=self._chrome_rev,
          private_bucket=False, buildroot=self._build_root, board=None,
          extra_args=generated_args + public_args)

    # Upload the private prebuilts, if any.
    if private_builders:
      prebuilts.UploadPrebuilts(
          category=self._prebuilt_type, chrome_rev=self._chrome_rev,
          private_bucket=True, buildroot=self._build_root, board=None,
          extra_args=generated_args + private_args)


class UploadPrebuiltsStage(generic_stages.BoardSpecificBuilderStage):
  """Uploads binaries generated by this build for developer use."""

  option_name = 'prebuilts'
  config_name = 'prebuilts'

  def __init__(self, builder_run, board, version=None, **kwargs):
    self.prebuilts_version = version
    super(UploadPrebuiltsStage, self).__init__(builder_run, board, **kwargs)

  def GenerateCommonArgs(self):
    """Generate common prebuilt arguments."""
    generated_args = []
    if self._run.options.debug:
      generated_args.extend(['--debug', '--dry-run'])

    profile = self._run.options.profile or self._run.config.profile
    if profile:
      generated_args.extend(['--profile', profile])

    # Generate the version if we are a manifest_version build.
    if self._run.config.manifest_version:
      version = self._run.GetVersion()
    else:
      version = self.prebuilts_version
    if version is not None:
      generated_args.extend(['--set-version', version])

    if self._run.config.git_sync:
      # Git sync should never be set for pfq type builds.
      assert not cbuildbot_config.IsPFQType(self._prebuilt_type)
      generated_args.extend(['--git-sync'])

    return generated_args

  @classmethod
  def _AddOptionsForSlave(cls, slave_config, board):
    """Private helper method to add upload_prebuilts args for a slave builder.

    Args:
      slave_config: The build config of a slave builder.
      board: The name of the "master" board on the master builder.

    Returns:
      An array of options to add to upload_prebuilts array that allow a master
      to submit prebuilt conf modifications on behalf of a slave.
    """
    args = []
    if slave_config['prebuilts']:
      for slave_board in slave_config['boards']:
        if slave_config['master'] and slave_board == board:
          # Ignore self.
          continue

        args.extend(['--slave-board', slave_board])
        slave_profile = slave_config['profile']
        if slave_profile:
          args.extend(['--slave-profile', slave_profile])

    return args

  @failures_lib.SetFailureType(failures_lib.InfrastructureFailure)
  def PerformStage(self):
    """Uploads prebuilts for master and slave builders."""
    prebuilt_type = self._prebuilt_type
    board = self._current_board
    binhosts = []

    # Whether we publish public or private prebuilts.
    public = self._run.config.prebuilts == constants.PUBLIC
    # Common args we generate for all types of builds.
    generated_args = self.GenerateCommonArgs()
    # Args we specifically add for public/private build types.
    public_args, private_args = [], []
    # Public / private builders.
    public_builders, private_builders = [], []

    # Distributed builders that use manifest-versions to sync with one another
    # share prebuilt logic by passing around versions.
    if cbuildbot_config.IsPFQType(prebuilt_type):
      # Public pfqs should upload host preflight prebuilts.
      if prebuilt_type != constants.CHROME_PFQ_TYPE:
        public_args.append('--sync-host')

      # Deduplicate against previous binhosts.
      binhosts.extend(self._GetPortageEnvVar(_PORTAGE_BINHOST, board).split())
      binhosts.extend(self._GetPortageEnvVar(_PORTAGE_BINHOST, None).split())
      for binhost in filter(None, binhosts):
        generated_args.extend(['--previous-binhost-url', binhost])

      if self._run.config.master and board == self._boards[-1]:
        # The master builder updates all the binhost conf files, and needs to do
        # so only once so as to ensure it doesn't try to update the same file
        # more than once. As multiple boards can be built on the same builder,
        # we arbitrarily decided to update the binhost conf files when we run
        # upload_prebuilts for the last board. The other boards are treated as
        # slave boards.
        generated_args.append('--sync-binhost-conf')
        for c in self._GetSlaveConfigs():
          if c['prebuilts'] == constants.PUBLIC:
            public_builders.append(c['name'])
            public_args.extend(self._AddOptionsForSlave(c, board))
          elif c['prebuilts'] == constants.PRIVATE:
            private_builders.append(c['name'])
            private_args.extend(self._AddOptionsForSlave(c, board))

    common_kwargs = {
        'buildroot': self._build_root,
        'category': prebuilt_type,
        'chrome_rev': self._chrome_rev,
        'version': self.prebuilts_version,
    }

    # Upload the public prebuilts, if any.
    if public_builders or public:
      public_board = board if public else None
      prebuilts.UploadPrebuilts(
          private_bucket=False, board=public_board,
          extra_args=generated_args + public_args,
          **common_kwargs)

    # Upload the private prebuilts, if any.
    if private_builders or not public:
      private_board = board if not public else None
      prebuilts.UploadPrebuilts(
          private_bucket=True, board=private_board,
          extra_args=generated_args + private_args,
          **common_kwargs)


class DevInstallerPrebuiltsStage(UploadPrebuiltsStage):
  """Stage that uploads DevInstaller prebuilts."""

  config_name = 'dev_installer_prebuilts'

  @failures_lib.SetFailureType(failures_lib.InfrastructureFailure)
  def PerformStage(self):
    generated_args = generated_args = self.GenerateCommonArgs()
    prebuilts.UploadDevInstallerPrebuilts(
        binhost_bucket=self._run.config.binhost_bucket,
        binhost_key=self._run.config.binhost_key,
        binhost_base_url=self._run.config.binhost_base_url,
        buildroot=self._build_root,
        board=self._current_board,
        extra_args=generated_args)


class UploadTestArtifactsStage(generic_stages.BoardSpecificBuilderStage,
                               generic_stages.ArchivingStageMixin):
  """Upload needed hardware test artifacts."""

  def BuildAutotestTarballs(self):
    """Build the autotest tarballs."""
    with osutils.TempDir(prefix='cbuildbot-autotest') as tempdir:
      with self.ArtifactUploader(strict=True) as queue:
        cwd = os.path.abspath(
            os.path.join(self._build_root, 'chroot', 'build',
                         self._current_board, constants.AUTOTEST_BUILD_PATH,
                         '..'))

        control_files_tarball = commands.BuildAutotestControlFilesTarball(
            self._build_root, cwd, tempdir)
        queue.put([control_files_tarball])

        packages_tarball = commands.BuildAutotestPackagesTarball(
            self._build_root, cwd, tempdir)
        queue.put([packages_tarball])

        # Tar up the test suites.
        test_suites_tarball = commands.BuildAutotestTestSuitesTarball(
            self._build_root, cwd, tempdir)
        queue.put([test_suites_tarball])

  def _GeneratePayloads(self, image_name, **kwargs):
    """Generate and upload payloads for |image_name|.

    Args:
      image_name: The image to use.
      **kwargs: Keyword arguments to pass to commands.GeneratePayloads.
    """
    with osutils.TempDir(prefix='cbuildbot-payloads') as tempdir:
      with self.ArtifactUploader() as queue:
        image_path = os.path.join(self.GetImageDirSymlink(), image_name)
        commands.GeneratePayloads(self._build_root, image_path, tempdir,
                                  **kwargs)
        for payload in os.listdir(tempdir):
          queue.put([os.path.join(tempdir, payload)])

  def BuildUpdatePayloads(self):
    """Archives update payloads when they are ready."""
    got_images = self.GetParallel('images_generated', pretty_name='images')
    if not got_images:
      return

    if 'test' in self._run.config.images:
      image_name = 'chromiumos_test_image.bin'
    elif 'dev' in self._run.config.images:
      image_name = 'chromiumos_image.bin'
    else:
      image_name = 'chromiumos_base_image.bin'
    logging.info('Generating payloads to upload for %s', image_name)
    self._GeneratePayloads(image_name, full=True, stateful=True)
    self.board_runattrs.SetParallel('payloads_generated', True)
    self._GeneratePayloads(image_name, delta=True)
    self.board_runattrs.SetParallel('delta_payloads_generated', True)

  @failures_lib.SetFailureType(failures_lib.InfrastructureFailure)
  def PerformStage(self):
    """Upload any needed HWTest artifacts."""
    steps = []
    if (self._run.ShouldBuildAutotest() and
        self._run.config.upload_hw_test_artifacts):
      steps.append(self.BuildAutotestTarballs)

    if self._run.config.upload_hw_test_artifacts:
      steps.append(self.BuildUpdatePayloads)

    parallel.RunParallelSteps(steps)

  def _HandleStageException(self, exc_info):
    # Tell the HWTestStage not to wait for payloads to be uploaded
    # in case UploadHWTestArtifacts throws an exception.
    self.board_runattrs.SetParallelDefault('payloads_generated', False)
    self.board_runattrs.SetParallelDefault('delta_payloads_generated', False)
    return super(UploadTestArtifactsStage, self)._HandleStageException(exc_info)


# TODO(mtennant): This class continues to exist only for subclasses that still
# need self.archive_stage.  Hopefully, we can get rid of that need, eventually.
class ArchivingStage(generic_stages.BoardSpecificBuilderStage,
                     generic_stages.ArchivingStageMixin):
  """Helper for stages that archive files.

  See ArchivingStageMixin for functionality.

  Attributes:
    archive_stage: The ArchiveStage instance for this board.
  """

  def __init__(self, builder_run, board, archive_stage, **kwargs):
    super(ArchivingStage, self).__init__(builder_run, board, **kwargs)
    self.archive_stage = archive_stage