buildbot/cbuildbot_stages.py

# Copyright (c) 2012 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 the various stages that a builder runs."""

import cPickle
import functools
import glob
import json
import logging
import multiprocessing
import os
import Queue
import shutil
import sys
import tempfile

from chromite.buildbot import builderstage as bs
from chromite.buildbot import cbuildbot_commands as commands
from chromite.buildbot import cbuildbot_config
from chromite.buildbot import configure_repo
from chromite.buildbot import cbuildbot_results as results_lib
from chromite.buildbot import constants
from chromite.buildbot import lkgm_manager
from chromite.buildbot import manifest_version
from chromite.buildbot import portage_utilities
from chromite.buildbot import repository
from chromite.buildbot import trybot_patch_pool
from chromite.buildbot import validation_pool
from chromite.lib import commandline
from chromite.lib import cros_build_lib
from chromite.lib import git
from chromite.lib import gs
from chromite.lib import toolchain
from chromite.lib import osutils
from chromite.lib import parallel
from chromite.lib import patch as cros_patch

_FULL_BINHOST = 'FULL_BINHOST'
_PORTAGE_BINHOST = 'PORTAGE_BINHOST'
_CROS_ARCHIVE_URL = 'CROS_ARCHIVE_URL'
_PRINT_INTERVAL = 1
_VM_TEST_ERROR_MSG = """
!!!VMTests failed!!!

Logs are uploaded in the corresponding test_results.tgz. This can be found by
clicking on the artifacts link in the "Report" Stage. Specifically look
for the test_harness/failed for the failing tests. For more
particulars, please refer to which test failed i.e. above see the
individual test that failed -- or if an update failed, check the
corresponding update directory.
"""

class NonHaltingBuilderStage(bs.BuilderStage):
  """Build stage that fails a build but finishes the other steps."""
  def Run(self):
    try:
      super(NonHaltingBuilderStage, self).Run()
    except results_lib.StepFailure:
      name = self.__class__.__name__
      cros_build_lib.Error('Ignoring StepFailure in %s', name)


class ForgivingBuilderStage(bs.BuilderStage):
  """Build stage that turns a build step red but not a build."""
  def _HandleStageException(self, exception):
    """Override and don't set status to FAIL but FORGIVEN instead."""
    return self._HandleExceptionAsWarning(exception)


class BoardSpecificBuilderStage(bs.BuilderStage):

  def __init__(self, options, build_config, board, suffix=None):
    super(BoardSpecificBuilderStage, self).__init__(options, build_config,
                                                    suffix)
    self._current_board = board

    if not isinstance(board, basestring):
      raise TypeError('Expected string, got %r' % (board,))

    # Add a board name suffix to differentiate between various boards (in case
    # more than one board is built on a single builder.)
    if len(self._boards) > 1 or build_config['grouped']:
      self.name = '%s [%s]' % (self.name, board)

  def GetImageDirSymlink(self, pointer='latest-cbuildbot'):
    """Get the location of the current image."""
    buildroot, board = self._options.buildroot, self._current_board
    return os.path.join(buildroot, 'src', 'build', 'images', board, pointer)


class CleanUpStage(bs.BuilderStage):
  """Stages that cleans up build artifacts from previous runs.

  This stage cleans up previous KVM state, temporary git commits,
  clobbers, and wipes tmp inside the chroot.
  """

  option_name = 'clean'

  def _CleanChroot(self):
    commands.CleanupChromeKeywordsFile(self._boards,
                                       self._build_root)
    chroot_tmpdir = os.path.join(self._build_root, constants.DEFAULT_CHROOT_DIR,
                                 'tmp')
    if os.path.exists(chroot_tmpdir):
      cros_build_lib.SudoRunCommand(['rm', '-rf', chroot_tmpdir],
                                    print_cmd=False)
      cros_build_lib.SudoRunCommand(['mkdir', '--mode', '1777', chroot_tmpdir],
                                    print_cmd=False)

  def _DeleteChroot(self):
    chroot = os.path.join(self._build_root, constants.DEFAULT_CHROOT_DIR)
    if os.path.exists(chroot):
      cros_build_lib.RunCommand(['cros_sdk', '--delete', '--chroot', chroot],
                                self._build_root,
                                cwd=self._build_root)

  def _DeleteArchivedTrybotImages(self):
    """For trybots, clear all previus archive images to save space."""
    archive_root = ArchiveStage.GetArchiveRoot(self._build_root, trybot=True)
    shutil.rmtree(archive_root, ignore_errors=True)

  def _DeleteArchivedPerfResults(self):
    """Clear any previously stashed perf results from hw testing."""
    for result in glob.glob(os.path.join(
        self._options.log_dir, '*.%s' % HWTestStage.PERF_RESULTS_EXTENSION)):
      os.remove(result)

  def _PerformStage(self):
    if (not (self._options.buildbot or self._options.remote_trybot)
        and self._options.clobber):
      if not commands.ValidateClobber(self._build_root):
        cros_build_lib.Die("--clobber in local mode must be approved.")

    # If we can't get a manifest out of it, then it's not usable and must be
    # clobbered.
    manifest = None
    if not self._options.clobber:
      try:
        manifest = git.ManifestCheckout.Cached(self._build_root, search=False)
      except (KeyboardInterrupt, MemoryError, SystemExit):
        raise
      except Exception, e:
        # Either there is no repo there, or the manifest isn't usable.  If the
        # directory exists, log the exception for debugging reasons.  Either
        # way, the checkout needs to be wiped since it's in an unknown
        # state.
        if os.path.exists(self._build_root):
          cros_build_lib.Warning("ManifestCheckout at %s is unusable: %s",
                                 self._build_root, e)

    if manifest is None:
      self._DeleteChroot()
      repository.ClearBuildRoot(self._build_root, self._options.preserve_paths)
    else:
      # Clean mount points first to be safe about deleting.
      commands.CleanUpMountPoints(self._build_root)

      commands.BuildRootGitCleanup(self._build_root, self._options.debug)
      tasks = [functools.partial(commands.BuildRootGitCleanup,
                                 self._build_root, self._options.debug),
               functools.partial(commands.WipeOldOutput, self._build_root),
               self._DeleteArchivedTrybotImages,
               self._DeleteArchivedPerfResults]
      if self._build_config['chroot_replace'] and self._options.build:
        tasks.append(self._DeleteChroot)
      else:
        tasks.append(self._CleanChroot)
      parallel.RunParallelSteps(tasks)


class PatchChangesStage(bs.BuilderStage):
  """Stage that patches a set of Gerrit changes to the buildroot source tree."""
  def __init__(self, options, build_config, patch_pool):
    """Construct a PatchChangesStage.

    Args:
      options, build_config: See arguments to bs.BuilderStage.__init__()
      patch_pool: A TrybotPatchPool object containing the different types of
                  patches to apply.
    """
    bs.BuilderStage.__init__(self, options, build_config)
    self.patch_pool = patch_pool

  @staticmethod
  def _CheckForDuplicatePatches(_series, changes):
    conflicts = {}
    duplicates = []
    for change in changes:
      if change.id is None:
        cros_build_lib.Warning(
            "Change %s lacks a usable ChangeId; duplicate checking cannot "
            "be done for this change.  If cherry-picking fails, this is a "
            "potential cause.", change)
        continue
      conflicts.setdefault(change.id, []).append(change)

    duplicates = [x for x in conflicts.itervalues() if len(x) > 1]
    if not duplicates:
      return changes

    for conflict in duplicates:
      cros_build_lib.Error(
          "Changes %s conflict with each other- they have same id %s.",
          ', '.join(map(str, conflict)), conflict[0].id)

    cros_build_lib.Die("Duplicate patches were encountered: %s", duplicates)

  @staticmethod
  def _FixIncompleteRemotePatches(series, changes):
    """Identify missing remote patches from older cbuildbot instances.

    Cbuildbot, prior to I8ab6790de801900c115a437b5f4ebb9a24db542f, uploaded
    a single patch per project- despite if there may have been a hundred
    patches actually pulled in by that patch.  This method detects when
    we're dealing w/ the old incomplete version, and fills in those gaps."""
    broken = [x for x in changes
              if isinstance(x, cros_patch.UploadedLocalPatch)]
    if not broken:
      return changes

    changes = list(changes)
    known = cros_patch.PatchCache(changes)

    for change in broken:
      git_repo = series.GetGitRepoForChange(change)
      tracking = series.GetTrackingBranchForChange(change)
      branch = getattr(change, 'original_branch', tracking)

      for target in cros_patch.GeneratePatchesFromRepo(
          git_repo, change.project, tracking, branch, change.internal,
          allow_empty=True, starting_ref='%s^' % change.sha1):

        if target in known:
          continue

        known.Inject(target)
        changes.append(target)

    return changes

  def _PatchSeriesFilter(self, series, changes):
    if self._options.remote_version == 3:
      changes = self._FixIncompleteRemotePatches(series, changes)
    return self._CheckForDuplicatePatches(series, changes)

  def _ApplyPatchSeries(self, series, patch_pool, **kwargs):
    """Applies a patch pool using a patch series."""
    kwargs.setdefault('frozen', False)
    # Honor the given ordering, so that if a gerrit/remote patch
    # conflicts w/ a local patch, the gerrit/remote patch are
    # blamed rather than local (patch ordering is typically
    # local, gerrit, then remote).
    kwargs.setdefault('honor_ordering', True)
    kwargs['changes_filter'] = self._PatchSeriesFilter

    _applied, failed_tot, failed_inflight = series.Apply(
        list(patch_pool), **kwargs)

    failures = failed_tot + failed_inflight
    if failures:
      cros_build_lib.Die("Failed applying patches: %s",
                         "\n".join(map(str, failures)))

  def _PerformStage(self):
    class NoisyPatchSeries(validation_pool.PatchSeries):
      """Custom PatchSeries that adds links to buildbot logs for remote trys."""

      def ApplyChange(self, change, dryrun=False):
        if isinstance(change, cros_patch.GerritPatch):
          cros_build_lib.PrintBuildbotLink(str(change), change.url)
        elif isinstance(change, cros_patch.UploadedLocalPatch):
          cros_build_lib.PrintBuildbotStepText(str(change))

        return validation_pool.PatchSeries.ApplyChange(self, change,
                                                       dryrun=dryrun)

    # Limit our resolution to non-manifest patches.
    patch_series = NoisyPatchSeries(
        self._build_root,
        force_content_merging=True,
        deps_filter_fn=lambda p: not trybot_patch_pool.ManifestFilter(p))

    self._ApplyPatchSeries(patch_series, self.patch_pool)


class BootstrapStage(PatchChangesStage):
  """Stage that patches a chromite repo and re-executes inside it.

  Attributes:
    returncode - the returncode of the cbuildbot re-execution.  Valid after
                 calling stage.Run().
  """
  option_name = 'bootstrap'

  def __init__(self, options, build_config, chromite_patch_pool,
               manifest_patch_pool=None):
    super(BootstrapStage, self).__init__(
        options, build_config, trybot_patch_pool.TrybotPatchPool())
    self.chromite_patch_pool = chromite_patch_pool
    self.manifest_patch_pool = manifest_patch_pool
    self.returncode = None

  def _ApplyManifestPatches(self, patch_pool):
    """Apply a pool of manifest patches to a temp manifest checkout.

    Arguments:
      filter_fn: Used to filter changes during dependency resolution.

    Returns:
      The path to the patched manifest checkout.

    Raises:
      Exception, if the new patched manifest cannot be parsed.
    """
    checkout_dir = os.path.join(self.tempdir, 'manfest-checkout')
    repository.CloneGitRepo(checkout_dir,
                            self._build_config['manifest_repo_url'])

    patch_series = validation_pool.PatchSeries.WorkOnSingleRepo(
        checkout_dir, deps_filter_fn=trybot_patch_pool.ManifestFilter,
        tracking_branch=self._target_manifest_branch)

    self._ApplyPatchSeries(patch_series, patch_pool)
    # Create the branch that 'repo init -b <target_branch> -u <patched_repo>'
    # will look for.
    cmd = ['branch', '-f', self._target_manifest_branch, constants.PATCH_BRANCH]
    git.RunGit(checkout_dir, cmd)

    # Verify that the patched manifest loads properly. Propagate any errors as
    # exceptions.
    # TODO(rcui): Do validation on other manifests if we start relying on them.
    git.Manifest.Cached(
        os.path.join(checkout_dir, constants.DEFAULT_MANIFEST),
        manifest_include_dir=checkout_dir)
    return checkout_dir

  @staticmethod
  def _FilterArgsForApi(parsed_args, api_minor):
    """Remove arguments that are introduced after an api version."""
    def filter_fn(passed_arg):
      return passed_arg.opt_inst.api_version <= api_minor

    accepted, removed = commandline.FilteringParser.FilterArgs(
        parsed_args, filter_fn)

    if removed:
      cros_build_lib.Warning('The following arguments were removed due to api: '
                             "'%s'" % ' '.join(removed))
    return accepted

  @classmethod
  def FilterArgsForTargetCbuildbot(cls, buildroot, cbuildbot_path, options):
    _, minor = cros_build_lib.GetTargetChromiteApiVersion(buildroot)
    args = [cbuildbot_path]
    args.extend(options.build_targets)
    args.extend(cls._FilterArgsForApi(options.parsed_args, minor))

    # Only pass down --cache-dir if it was specified. By default, we want
    # the cache dir to live in the root of each checkout, so this means that
    # each instance of cbuildbot needs to calculate the default separately.
    if minor >= 2 and options.cache_dir_specified:
      args += ['--cache-dir', options.cache_dir]

    return args

  #pylint: disable=E1101
  @osutils.TempDirDecorator
  def _PerformStage(self):
    # The plan for the builders is to use master branch to bootstrap other
    # branches. Now, if we wanted to test patches for both the bootstrap code
    # (on master) and the branched chromite (say, R20), we need to filter the
    # patches by branch.
    filter_branch = self._target_manifest_branch
    if self._options.test_bootstrap:
      filter_branch = 'master'

    chromite_dir = os.path.join(self.tempdir, 'chromite')
    reference_repo = os.path.join(constants.SOURCE_ROOT, 'chromite', '.git')
    repository.CloneGitRepo(chromite_dir, constants.CHROMITE_URL,
                            reference=reference_repo)
    git.RunGit(chromite_dir, ['checkout', filter_branch])

    def BranchAndChromiteFilter(patch):
      return (trybot_patch_pool.BranchFilter(filter_branch, patch) and
              trybot_patch_pool.ChromiteFilter(patch))

    patch_series = validation_pool.PatchSeries.WorkOnSingleRepo(
        chromite_dir, filter_branch,
        deps_filter_fn=BranchAndChromiteFilter)

    filtered_pool = self.chromite_patch_pool.FilterBranch(filter_branch)
    if filtered_pool:
      self._ApplyPatchSeries(patch_series, filtered_pool)

    cbuildbot_path = constants.PATH_TO_CBUILDBOT
    if not os.path.exists(os.path.join(self.tempdir, cbuildbot_path)):
      cbuildbot_path = 'chromite/buildbot/cbuildbot'
    cmd = self.FilterArgsForTargetCbuildbot(self.tempdir, cbuildbot_path,
                                       self._options)

    extra_params = ['--sourceroot=%s' % self._options.sourceroot]
    extra_params.extend(self._options.bootstrap_args)
    if self._options.test_bootstrap:
      # We don't want re-executed instance to see this.
      cmd = [a for a in cmd if a != '--test-bootstrap']
    else:
      # If we've already done the desired number of bootstraps, disable
      # bootstrapping for the next execution.  Also pass in the patched manifest
      # repository.
      extra_params.append('--nobootstrap')
      if self.manifest_patch_pool:
        manifest_dir = self._ApplyManifestPatches(self.manifest_patch_pool)
        extra_params.extend(['--manifest-repo-url', manifest_dir])

    cmd += extra_params
    result_obj = cros_build_lib.RunCommand(
        cmd, cwd=self.tempdir, kill_timeout=30, error_code_ok=True)
    self.returncode = result_obj.returncode


class SyncStage(bs.BuilderStage):
  """Stage that performs syncing for the builder."""

  option_name = 'sync'
  output_manifest_sha1 = True

  def __init__(self, options, build_config):
    super(SyncStage, self).__init__(options, build_config)
    self.repo = None
    self.skip_sync = False
    self.internal = self._build_config['internal']

  def _GetManifestVersionsRepoUrl(self, read_only=False):
    return cbuildbot_config.GetManifestVersionsRepoUrl(
        self.internal,
        read_only=read_only)

  def Initialize(self):
    self._InitializeRepo()

  def _InitializeRepo(self, build_root=None, **kwds):
    if build_root is None:
      build_root = self._build_root

    manifest_url = self._options.manifest_repo_url
    if manifest_url is None:
      manifest_url = self._build_config['manifest_repo_url']

    kwds.setdefault('referenced_repo', self._options.reference_repo)
    kwds.setdefault('branch', self._target_manifest_branch)

    self.repo = repository.RepoRepository(manifest_url, build_root, **kwds)

  def GetNextManifest(self):
    """Returns the manifest to use."""
    return repository.RepoRepository.DEFAULT_MANIFEST

  def ManifestCheckout(self, next_manifest):
    """Checks out the repository to the given manifest."""
    self._Print('\n'.join(['BUILDROOT: %s' % self.repo.directory,
                           'TRACKING BRANCH: %s' % self.repo.branch,
                           'NEXT MANIFEST: %s' % next_manifest]))

    if not self.skip_sync:
      self.repo.Sync(next_manifest)
    print >> sys.stderr, self.repo.ExportManifest(
        mark_revision=self.output_manifest_sha1)

  def _PerformStage(self):
    self.Initialize()
    with osutils.TempDirContextManager() as tempdir:
      # Save off the last manifest.
      fresh_sync = True
      if os.path.exists(self.repo.directory) and not self._options.clobber:
        old_filename = os.path.join(tempdir, 'old.xml')
        try:
          old_contents = self.repo.ExportManifest()
        except cros_build_lib.RunCommandError as e:
          cros_build_lib.Warning(str(e))
        else:
          osutils.WriteFile(old_filename, old_contents)
          fresh_sync = False

      # Sync.
      self.ManifestCheckout(self.GetNextManifest())

      # Print the blamelist.
      if fresh_sync:
        cros_build_lib.PrintBuildbotStepText('(From scratch)')
      elif self._options.buildbot:
        lkgm_manager.GenerateBlameList(self.repo, old_filename)

  def HandleSkip(self):
    super(SyncStage, self).HandleSkip()
    # Ensure the gerrit remote is present for backwards compatibility.
    # TODO(davidjames): Remove this.
    configure_repo.SetupGerritRemote(self._build_root)


class LKGMSyncStage(SyncStage):
  """Stage that syncs to the last known good manifest blessed by builders."""

  output_manifest_sha1 = False

  def GetNextManifest(self):
    """Override: Gets the LKGM."""
    # TODO(sosa):  Should really use an initialized manager here.
    if self.internal:
      mv_dir = 'manifest-versions-internal'
    else:
      mv_dir = 'manifest-versions'

    manifest_path = os.path.join(self._build_root, mv_dir)
    manifest_repo = self._GetManifestVersionsRepoUrl(read_only=True)
    manifest_version.RefreshManifestCheckout(manifest_path, manifest_repo)
    return os.path.join(manifest_path, lkgm_manager.LKGMManager.LKGM_PATH)


class ChromeLKGMSyncStage(SyncStage):
  """Stage that syncs to the last known good manifest for Chrome."""

  output_manifest_sha1 = False

  def GetNextManifest(self):
    """Override: Gets the LKGM from the Chrome tree."""
    chrome_lkgm = commands.GetChromeLKGM(self._options.chrome_version)

    # We need a full buildspecs manager here as we need an initialized manifest
    # manager with paths to the spec.
    manifest_manager = manifest_version.BuildSpecsManager(
      source_repo=self.repo,
      manifest_repo=self._GetManifestVersionsRepoUrl(read_only=False),
      build_name=self._bot_id,
      incr_type='build',
      force=False,
      branch=self._target_manifest_branch)

    manifest_manager.BootstrapFromVersion(chrome_lkgm)
    return manifest_manager.GetLocalManifest(chrome_lkgm)


class ManifestVersionedSyncStage(SyncStage):
  """Stage that generates a unique manifest file, and sync's to it."""

  manifest_manager = None
  output_manifest_sha1 = False

  def __init__(self, options, build_config):
    # Perform the sync at the end of the stage to the given manifest.
    super(ManifestVersionedSyncStage, self).__init__(options, build_config)
    self.repo = None

    # If a builder pushes changes (even with dryrun mode), we need a writable
    # repository. Otherwise, the push will be rejected by the server.
    self.manifest_repo = self._GetManifestVersionsRepoUrl(read_only=False)

    # 1. If we're uprevving Chrome, Chrome might have changed even if the
    #    manifest has not, so we should force a build to double check. This
    #    means that we'll create a new manifest, even if there are no changes.
    # 2. If we're running with --debug, we should always run through to
    #    completion, so as to ensure a complete test.
    self._force = self._chrome_rev or options.debug

  def HandleSkip(self):
    """Initializes a manifest manager to the specified version if skipped."""
    super(ManifestVersionedSyncStage, self).HandleSkip()
    if self._options.force_version:
      self.Initialize()
      self.ForceVersion(self._options.force_version)

  def ForceVersion(self, version):
    """Creates a manifest manager from given version and returns manifest."""
    return ManifestVersionedSyncStage.manifest_manager.BootstrapFromVersion(
        version)

  def Initialize(self):
    """Initializes a manager that manages manifests for associated stages."""
    increment = ('build' if self._target_manifest_branch == 'master'
                 else 'branch')

    dry_run = self._options.debug

    self._InitializeRepo()

    # If chrome_rev is somehow set, fail.
    assert not self._chrome_rev, \
        'chrome_rev is unsupported on release builders.'

    ManifestVersionedSyncStage.manifest_manager = \
        manifest_version.BuildSpecsManager(
            source_repo=self.repo,
            manifest_repo=self.manifest_repo,
            build_name=self._bot_id,
            incr_type=increment,
            force=self._force,
            branch=self._target_manifest_branch,
            dry_run=dry_run,
            master=self._build_config['master'])

  def GetNextManifest(self):
    """Uses the initialized manifest manager to get the next manifest."""
    assert self.manifest_manager, \
        'Must run GetStageManager before checkout out build.'

    to_return = self.manifest_manager.GetNextBuildSpec()
    previous_version = self.manifest_manager.GetLatestPassingSpec()
    target_version = self.manifest_manager.current_version

    # Print the Blamelist here.
    url_prefix = 'http://chromeos-images.corp.google.com/diff/report?'
    url = url_prefix + 'from=%s&to=%s' % (previous_version, target_version)
    cros_build_lib.PrintBuildbotLink('Blamelist', url)

    return to_return

  def _PerformStage(self):
    self.Initialize()
    if self._options.force_version:
      next_manifest = self.ForceVersion(self._options.force_version)
    else:
      next_manifest = self.GetNextManifest()

    if not next_manifest:
      cros_build_lib.Info('Found no work to do.')
      if ManifestVersionedSyncStage.manifest_manager.DidLastBuildFail():
        raise results_lib.StepFailure('The previous build failed.')
      else:
        sys.exit(0)

    # Log this early on for the release team to grep out before we finish.
    if ManifestVersionedSyncStage.manifest_manager:
      self._Print('\nRELEASETAG: %s\n' % (
          ManifestVersionedSyncStage.manifest_manager.current_version))

    self.ManifestCheckout(next_manifest)


class LKGMCandidateSyncStage(ManifestVersionedSyncStage):
  """Stage that generates a unique manifest file candidate, and sync's to it."""

  sub_manager = None

  def __init__(self, options, build_config):
    super(LKGMCandidateSyncStage, self).__init__(options, build_config)
    # lkgm_manager deals with making sure we're synced to whatever manifest
    # we get back in GetNextManifest so syncing again is redundant.
    self.skip_sync = True

  def _GetInitializedManager(self, internal):
    """Returns an initialized lkgm manager."""
    increment = ('build' if self._target_manifest_branch == 'master'
                 else 'branch')
    return lkgm_manager.LKGMManager(
        source_repo=self.repo,
        manifest_repo=cbuildbot_config.GetManifestVersionsRepoUrl(
            internal, read_only=False),
        build_name=self._bot_id,
        build_type=self._build_config['build_type'],
        incr_type=increment,
        force=self._force,
        branch=self._target_manifest_branch,
        dry_run=self._options.debug,
        master=self._build_config['master'])

  def Initialize(self):
    """Override: Creates an LKGMManager rather than a ManifestManager."""
    self._InitializeRepo()
    ManifestVersionedSyncStage.manifest_manager = self._GetInitializedManager(
        self.internal)
    if (self._build_config['unified_manifest_version'] and
        self._build_config['master']):
      assert self.internal, 'Unified masters must use an internal checkout.'
      LKGMCandidateSyncStage.sub_manager = self._GetInitializedManager(False)

  def ForceVersion(self, version):
    manifest = super(LKGMCandidateSyncStage, self).ForceVersion(version)
    if LKGMCandidateSyncStage.sub_manager:
      LKGMCandidateSyncStage.sub_manager.BootstrapFromVersion(version)

    return manifest

  def GetNextManifest(self):
    """Gets the next manifest using LKGM logic."""
    assert self.manifest_manager, \
        'Must run Initialize before we can get a manifest.'
    assert isinstance(self.manifest_manager, lkgm_manager.LKGMManager), \
        'Manifest manager instantiated with wrong class.'

    if self._build_config['master']:
      manifest = self.manifest_manager.CreateNewCandidate()
      if LKGMCandidateSyncStage.sub_manager:
        LKGMCandidateSyncStage.sub_manager.CreateFromManifest(manifest)

      return manifest

    else:
      return self.manifest_manager.GetLatestCandidate()


class CommitQueueSyncStage(LKGMCandidateSyncStage):
  """Commit Queue Sync stage that handles syncing and applying patches.

  This stage handles syncing to a manifest, passing around that manifest to
  other builders and finding the Gerrit Reviews ready to be committed and
  applying them into its out checkout.
  """

  # Path relative to the buildroot of where to store the pickled validation
  # pool.
  PICKLED_POOL_FILE = 'validation_pool.dump'

  pool = None

  def __init__(self, options, build_config):
    super(CommitQueueSyncStage, self).__init__(options, build_config)
    CommitQueueSyncStage.pool = None
    # Figure out the builder's name from the buildbot waterfall.
    builder_name = build_config['paladin_builder_name']
    self.builder_name = builder_name if builder_name else build_config['name']

  def SaveValidationPool(self):
    """Serializes the validation pool.

    Returns: returns a path to the serialized form of the validation pool.
    """
    path_to_file = os.path.join(self._build_root, self.PICKLED_POOL_FILE)
    with open(path_to_file, 'wb') as p_file:
      cPickle.dump(self.pool, p_file, protocol=cPickle.HIGHEST_PROTOCOL)

    return path_to_file

  def LoadValidationPool(self, path_to_file):
    """Loads the validation pool from the file."""
    with open(path_to_file, 'rb') as p_file:
      CommitQueueSyncStage.pool = cPickle.load(p_file)

  def HandleSkip(self):
    """Handles skip and initializes validation pool from manifest."""
    super(CommitQueueSyncStage, self).HandleSkip()
    if self._options.validation_pool:
      self.LoadValidationPool(self._options.validation_pool)
    else:
      self.SetPoolFromManifest(self.manifest_manager.GetLocalManifest())

  def SetPoolFromManifest(self, manifest):
    """Sets validation pool based on manifest path passed in."""
    CommitQueueSyncStage.pool = \
        validation_pool.ValidationPool.AcquirePoolFromManifest(
            manifest, self._build_config['overlays'],
            self._build_root, self._options.buildnumber, self.builder_name,
            self._build_config['master'], self._options.debug)

  def GetNextManifest(self):
    """Gets the next manifest using LKGM logic."""
    assert self.manifest_manager, \
        'Must run Initialize before we can get a manifest.'
    assert isinstance(self.manifest_manager, lkgm_manager.LKGMManager), \
        'Manifest manager instantiated with wrong class.'

    if self._build_config['master']:
      try:
        # In order to acquire a pool, we need an initialized buildroot.
        if not repository.InARepoRepository(self.repo.directory):
          self.repo.Initialize()

        pool = validation_pool.ValidationPool.AcquirePool(
            self._build_config['overlays'], self._build_root,
            self._options.buildnumber, self.builder_name,
            self._options.debug,
            changes_query=self._options.cq_gerrit_override)

        # We only have work to do if there are changes to try.
        try:
          # Try our best to submit these but may have been overridden and won't
          # let that stop us from continuing the build.
          pool.SubmitNonManifestChanges()
        except validation_pool.FailedToSubmitAllChangesException as e:
          cros_build_lib.Warning(str(e))

        CommitQueueSyncStage.pool = pool

      except validation_pool.TreeIsClosedException as e:
        cros_build_lib.Warning(str(e))
        return None

      manifest = self.manifest_manager.CreateNewCandidate(validation_pool=pool)
      if LKGMCandidateSyncStage.sub_manager:
        LKGMCandidateSyncStage.sub_manager.CreateFromManifest(manifest)

      return manifest
    else:
      manifest = self.manifest_manager.GetLatestCandidate()
      if manifest:
        self.SetPoolFromManifest(manifest)
        self.pool.ApplyPoolIntoRepo()

      return manifest

  # Accessing a protected member.  TODO(sosa): Refactor PerformStage to not be
  # a protected member as children override it.
  # pylint: disable=W0212
  def _PerformStage(self):
    """Performs normal stage and prints blamelist at end."""
    if self._options.force_version:
      self.HandleSkip()
    else:
      ManifestVersionedSyncStage._PerformStage(self)


class ManifestVersionedSyncCompletionStage(ForgivingBuilderStage):
  """Stage that records board specific results for a unique manifest file."""

  option_name = 'sync'

  def __init__(self, options, build_config, success):
    super(ManifestVersionedSyncCompletionStage, self).__init__(
        options, build_config)
    self.success = success
    # Message that can be set that well be sent along with the status in
    # UpdateStatus.
    self.message = None

  def _PerformStage(self):
    if ManifestVersionedSyncStage.manifest_manager:
      ManifestVersionedSyncStage.manifest_manager.UpdateStatus(
         success=self.success, message=self.message)


class ImportantBuilderFailedException(Exception):
  """Exception thrown when an important build fails to build."""
  pass


class LKGMCandidateSyncCompletionStage(ManifestVersionedSyncCompletionStage):
  """Stage that records whether we passed or failed to build/test manifest."""

  def _GetSlavesStatus(self):
    if self._options.debug:
      # In debug mode, nothing is uploaded to Google Storage, so we bypass
      # the extra hop and just look at what we have locally.
      status = manifest_version.BuilderStatus.GetCompletedStatus(self.success)
      status_obj = manifest_version.BuilderStatus(status, self.message)
      return {self._bot_id: status_obj}
    elif not self._build_config['master']:
      # Slaves only need to look at their own status.
      return ManifestVersionedSyncStage.manifest_manager.GetBuildersStatus(
          [self._bot_id])
    elif not LKGMCandidateSyncStage.sub_manager:
      return ManifestVersionedSyncStage.manifest_manager.GetBuildersStatus(
          self._GetSlavesForMaster())
    else:
      public_builders, private_builders = self._GetSlavesForUnifiedMaster()
      statuses = {}
      if public_builders:
        statuses.update(
          LKGMCandidateSyncStage.sub_manager.GetBuildersStatus(
              public_builders))
      if private_builders:
        statuses.update(
            ManifestVersionedSyncStage.manifest_manager.GetBuildersStatus(
                private_builders))
      return statuses

  def HandleSuccess(self):
    # We only promote for the pfq, not chrome pfq.
    # TODO(build): Run this logic in debug mode too.
    if (not self._options.debug and
        cbuildbot_config.IsPFQType(self._build_config['build_type']) and
        self._build_config['master'] and
        self._target_manifest_branch == 'master' and
        ManifestVersionedSyncStage.manifest_manager != None and
        self._build_config['build_type'] != constants.CHROME_PFQ_TYPE):
      ManifestVersionedSyncStage.manifest_manager.PromoteCandidate()
      if LKGMCandidateSyncStage.sub_manager:
        LKGMCandidateSyncStage.sub_manager.PromoteCandidate()

  def HandleValidationFailure(self, failing_statuses):
    cros_build_lib.PrintBuildbotStepWarnings()
    cros_build_lib.Warning('\n'.join([
        'The following builders failed with this manifest:',
        ', '.join(sorted(failing_statuses.keys())),
        'Please check the logs of the failing builders for details.']))

  def HandleValidationTimeout(self, inflight_statuses):
    cros_build_lib.PrintBuildbotStepWarnings()
    cros_build_lib.Warning('\n'.join([
        'The following builders took too long to finish:',
        ', '.join(sorted(inflight_statuses.keys())),
        'Please check the logs of these builders for details.']))

  def _PerformStage(self):
    if ManifestVersionedSyncStage.manifest_manager:
      ManifestVersionedSyncStage.manifest_manager.UploadStatus(
         success=self.success, message=self.message)

      statuses = self._GetSlavesStatus()
      failing_build_dict, inflight_build_dict = {}, {}
      for builder, status in statuses.iteritems():
        if status.Failed():
          failing_build_dict[builder] = status
        elif status.Inflight():
          inflight_build_dict[builder] = status

      if failing_build_dict or inflight_build_dict:
        if failing_build_dict:
          self.HandleValidationFailure(failing_build_dict)

        if inflight_build_dict:
          self.HandleValidationTimeout(inflight_build_dict)

      if failing_build_dict or inflight_build_dict:
        raise results_lib.StepFailure()
      else:
        self.HandleSuccess()


class CommitQueueCompletionStage(LKGMCandidateSyncCompletionStage):
  """Commits or reports errors to CL's that failed to be validated."""
  def HandleSuccess(self):
    if self._build_config['master']:
      CommitQueueSyncStage.pool.SubmitPool()
      # After submitting the pool, update the commit hashes for uprevved
      # ebuilds.
      portage_utilities.EBuild.UpdateCommitHashesForChanges(
          CommitQueueSyncStage.pool.changes, self._build_root)
      if cbuildbot_config.IsPFQType(self._build_config['build_type']):
        super(CommitQueueCompletionStage, self).HandleSuccess()

  def HandleValidationFailure(self, failing_statuses):
    """Sends the failure message of all failing builds in one go."""
    super(CommitQueueCompletionStage, self).HandleValidationFailure(
        failing_statuses)

    if self._build_config['master']:
      failing_messages = [x.message for x in failing_statuses.itervalues()]
      CommitQueueSyncStage.pool.HandleValidationFailure(failing_messages)

  def HandleValidationTimeout(self, inflight_builders):
    super(CommitQueueCompletionStage, self).HandleValidationTimeout(
        inflight_builders)
    CommitQueueSyncStage.pool.HandleValidationTimeout()

  def _PerformStage(self):
    if not self.success and self._build_config['important']:
      # This message is sent along with the failed status to the master to
      # indicate a failure.
      self.message = CommitQueueSyncStage.pool.GetValidationFailedMessage()

    super(CommitQueueCompletionStage, self)._PerformStage()


class RefreshPackageStatusStage(bs.BuilderStage):
  """Stage for refreshing Portage package status in online spreadsheet."""
  def _PerformStage(self):
    commands.RefreshPackageStatus(buildroot=self._build_root,
                                  boards=self._boards,
                                  debug=self._options.debug)


class BuildBoardStage(bs.BuilderStage):
  """Stage that is responsible for building host pkgs and setting up a board."""

  option_name = 'build'

  def __init__(self, options, build_config, boards=None):
    super(BuildBoardStage, self).__init__(options, build_config)
    if boards is not None:
      self._boards = boards

  def _PerformStage(self):
    chroot_upgrade = True

    env = {}
    if self._options.clobber:
      env['IGNORE_PREFLIGHT_BINHOST'] = '1'

    latest_toolchain = self._build_config['latest_toolchain']
    if latest_toolchain and self._build_config['gcc_githash']:
      env['USE'] = 'git_gcc'
      env['GCC_GITHASH'] = self._build_config['gcc_githash']

    chroot_path = os.path.join(self._build_root, constants.DEFAULT_CHROOT_DIR)
    if not os.path.isdir(chroot_path) or self._build_config['chroot_replace']:
      commands.MakeChroot(
          buildroot=self._build_root,
          replace=self._build_config['chroot_replace'],
          use_sdk=self._build_config['use_sdk'],
          chrome_root=self._options.chrome_root,
          extra_env=env)
      chroot_upgrade = False
    else:
      commands.RunChrootUpgradeHooks(self._build_root)

    # Iterate through boards to setup.
    for board_to_build in self._boards:
      # Only build the board if the directory does not exist.
      board_path = os.path.join(chroot_path, 'build', board_to_build)
      if os.path.isdir(board_path):
        continue

      commands.SetupBoard(self._build_root,
                          board=board_to_build,
                          usepkg=self._build_config['usepkg_setup_board'],
                          latest_toolchain=latest_toolchain,
                          extra_env=env,
                          profile=self._options.profile or
                            self._build_config['profile'],
                          chroot_upgrade=chroot_upgrade)

      chroot_upgrade = False


class UprevStage(bs.BuilderStage):
  """Stage that uprevs Chromium OS packages that the builder intends to
  validate.
  """

  option_name = 'uprev'

  def __init__(self, options, build_config, boards=None, enter_chroot=True):
    super(UprevStage, self).__init__(options, build_config)
    self._enter_chroot = enter_chroot
    if boards is not None:
      self._boards = boards

  def _PerformStage(self):
    # Perform chrome uprev.
    chrome_atom_to_build = None
    if self._chrome_rev:
      # TODO(build): If anyone wants this to run outside of the chroot, we'll
      # need to update a few things first.  But no one does, so we'll leave it.
      chrome_atom_to_build = commands.MarkChromeAsStable(
          self._build_root, self._target_manifest_branch,
          self._chrome_rev, self._boards,
          chrome_version=self._options.chrome_version)

    useflags = self._build_config['useflags'] or []
    pgo_generate = constants.USE_PGO_GENERATE in useflags

    # Perform other uprevs.
    if self._build_config['uprev']:
      overlays, _ = self._ExtractOverlays()
      commands.UprevPackages(self._build_root,
                             self._boards,
                             overlays,
                             enter_chroot=self._enter_chroot)
    elif self._chrome_rev and not chrome_atom_to_build and not pgo_generate:
      # TODO(sosa): Do this in a better way.
      sys.exit(0)


class SyncChromeStage(bs.BuilderStage):
  """Stage that syncs Chrome sources if needed."""

  option_name = 'managed_chrome'

  def _GetArchitectures(self):
    """Get the list of architectures built by this builder."""
    return set(self._GetPortageEnvVar('ARCH', b) for b in self._boards)

  def _PerformStage(self):
    kwargs = {}
    if self._chrome_rev == constants.CHROME_REV_SPEC:
      kwargs['revision'] = self._options.chrome_version
      cpv = None
      cros_build_lib.PrintBuildbotStepText('revision %s' % kwargs['revision'])
    else:
      cpv = portage_utilities.BestVisible(constants.CHROME_CP,
                                          buildroot=self._build_root)
      kwargs['tag'] = cpv.version_no_rev.partition('_')[0]
      cros_build_lib.PrintBuildbotStepText('tag %s' % kwargs['tag'])
    useflags = self._build_config['useflags'] or []
    commands.SyncChrome(self._build_root, self._options.chrome_root, useflags,
                        **kwargs)
    if constants.USE_PGO_USE in useflags and cpv is not None:
      commands.WaitForPGOData(self._GetArchitectures(), cpv)
    if (constants.USE_PGO_GENERATE in useflags and cpv is not None and
        commands.CheckPGOData(self._GetArchitectures(), cpv)):
      cros_build_lib.Info('PGO data already generated')
      sys.exit(0)


class PatchChromeStage(bs.BuilderStage):
  """Stage that applies Chrome patches if needed."""

  option_name = 'rietveld_patches'

  def _PerformStage(self):
    for patch in ' '.join(self._options.rietveld_patches).split():
      patch, colon, subdir = patch.partition(':')
      if not colon:
        subdir = 'src'
      commands.PatchChrome(self._options.chrome_root, patch, subdir)


class BuildTargetStage(BoardSpecificBuilderStage):
  """This stage builds Chromium OS for a target.

  Specifically, we build Chromium OS packages and perform imaging to get
  the images we want per the build spec."""

  option_name = 'build'

  def __init__(self, options, build_config, board, archive_stage):
    super(BuildTargetStage, self).__init__(options, build_config, board)
    self._env = {}
    if self._build_config.get('useflags'):
      self._env['USE'] = ' '.join(self._build_config['useflags'])

    if self._options.chrome_root:
      self._env['CHROME_ORIGIN'] = 'LOCAL_SOURCE'

    if self._options.clobber:
      self._env['IGNORE_PREFLIGHT_BINHOST'] = '1'

    self._archive_stage = archive_stage
    self._tarball_dir = None

  def _BuildImages(self):
    # We only build base, dev, and test images from this stage.
    images_can_build = set(['base', 'dev', 'test'])
    images_to_build = set(self._build_config['images']).intersection(
        images_can_build)

    rootfs_verification = self._build_config['rootfs_verification']
    commands.BuildImage(self._build_root,
                        self._current_board,
                        list(images_to_build),
                        rootfs_verification=rootfs_verification,
                        version=self._archive_stage.GetReleaseTag(),
                        disk_layout=self._build_config['disk_layout'],
                        extra_env=self._env)

    if self._build_config['vm_tests']:
      commands.BuildVMImageForTesting(
          self._build_root,
          self._current_board,
          disk_layout=self._build_config['disk_vm_layout'],
          extra_env=self._env)

    # Update link to latest image.
    latest_image = os.readlink(self.GetImageDirSymlink('latest'))
    cbuildbot_image_link = self.GetImageDirSymlink()
    if os.path.lexists(cbuildbot_image_link):
      os.remove(cbuildbot_image_link)

    os.symlink(latest_image, cbuildbot_image_link)

  def _BuildAutotestTarballs(self):
    # Build autotest tarball, which is used in archive step. This is generated
    # here because the test directory is modified during the test phase, and we
    # don't want to include the modifications in the tarball.
    tarballs = commands.BuildAutotestTarballs(
        self._build_root, self._current_board, self._tarball_dir)
    self._archive_stage.AutotestTarballsReady(tarballs)

  def _BuildFullAutotestTarball(self):
    # Build a full autotest tarball for hwqual image. This tarball is to be
    # archived locally.
    tarball = commands.BuildFullAutotestTarball(self._build_root,
                                                self._current_board,
                                                self._tarball_dir)
    self._archive_stage.FullAutotestTarballReady(tarball)

  def _PerformStage(self):
    build_autotest = (self._build_config['build_tests'] and
                      self._options.tests)

    # If we are using ToT toolchain, don't attempt to update
    # the toolchain during build_packages.
    skip_toolchain_update = self._build_config['latest_toolchain']

    commands.Build(self._build_root,
                   self._current_board,
                   build_autotest=build_autotest,
                   skip_toolchain_update=skip_toolchain_update,
                   usepkg=self._build_config['usepkg_build_packages'],
                   nowithdebug=self._build_config['nowithdebug'],
                   packages=self._build_config['packages'],
                   chrome_root=self._options.chrome_root,
                   extra_env=self._env)

    # Build images and autotest tarball in parallel.
    steps = []
    if build_autotest and (self._build_config['upload_hw_test_artifacts'] or
                           self._build_config['archive_build_debug']):
      self._tarball_dir = tempfile.mkdtemp(prefix='autotest')
      steps.append(self._BuildAutotestTarballs)
      # Build a full autotest tarball only for chromeos_offical builds
      if self._build_config['chromeos_official']:
        steps.append(self._BuildFullAutotestTarball)
    else:
      self._archive_stage.AutotestTarballsReady(None)

    if self._build_config['images']:
      steps.append(self._BuildImages)
    parallel.RunParallelSteps(steps)

    # TODO(yjhong): Remove this and instruct archive_hwqual to copy the tarball
    # directly.
    if self._tarball_dir and self._build_config['chromeos_official']:
      shutil.copyfile(os.path.join(self._tarball_dir, 'autotest.tar.bz2'),
                      os.path.join(self.GetImageDirSymlink(),
                                   'autotest.tar.bz2'))

  def _HandleStageException(self, exception):
    # In case of an exception, this prevents any consumer from starving.
    self._archive_stage.AutotestTarballsReady(None)
    return super(BuildTargetStage, self)._HandleStageException(exception)


class SignerTestStage(BoardSpecificBuilderStage):
  """Run signer related tests."""

  option_name = 'tests'
  config_name = 'signer_tests'

  # If the signer tests take longer than 30 minutes, abort. They usually take
  # five minutes to run.
  SIGNER_TEST_TIMEOUT = 1800

  def __init__(self, options, build_config, board, archive_stage):
    super(SignerTestStage, self).__init__(options, build_config, board)
    self._archive_stage = archive_stage

  def _PerformStage(self):
    if not self._archive_stage.WaitForRecoveryImage():
      raise InvalidTestConditionException('Missing recovery image.')
    with cros_build_lib.SubCommandTimeout(self.SIGNER_TEST_TIMEOUT):
      commands.RunSignerTests(self._build_root,
                              self._current_board)


class UnitTestStage(BoardSpecificBuilderStage):
  """Run unit tests."""

  option_name = 'tests'
  config_name = 'unittests'

  # If the unit tests take longer than 70 minutes, abort. They usually take
  # ten minutes to run.
  #
  # If the processes hang, parallel_emerge will print a status report after 60
  # minutes, so we picked 70 minutes because it gives us a little buffer time.
  UNIT_TEST_TIMEOUT = 70 * 60

  def _PerformStage(self):
    with cros_build_lib.SubCommandTimeout(self.UNIT_TEST_TIMEOUT):
      commands.RunUnitTests(self._build_root,
                            self._current_board,
                            full=(not self._build_config['quick_unit']),
                            nowithdebug=self._build_config['nowithdebug'])


class VMTestStage(BoardSpecificBuilderStage):
  """Run autotests in a virtual machine."""

  option_name = 'tests'
  config_name = 'vm_tests'

  def __init__(self, options, build_config, board, archive_stage):
    super(VMTestStage, self).__init__(options, build_config, board)
    self._archive_stage = archive_stage

  def PrintBuildbotLink(self, download_url, filename):
    """Print a link to an artifact in Google Storage.

    Args:
      download_url: The directory this file can be downloaded from.
      filename: The filename of the uploaded file.
    """
    url = '%s/%s' % (download_url.rstrip('/'), filename)
    text = filename
    if filename.endswith('.dmp.txt'):
      text = 'crash: %s' % filename
    cros_build_lib.PrintBuildbotLink(text, url)

  def _ArchiveTestResults(self, test_results_dir):
    """Archives test results to Google Storage."""
    test_tarball = commands.ArchiveTestResults(
        self._build_root, test_results_dir, prefix='')
    # Wait for breakpad symbols. The archive path will be ready by the time
    # the breakpad symbols are ready.
    got_symbols = self._archive_stage.WaitForBreakpadSymbols()
    archive_path = self._archive_stage.GetArchivePath()
    upload_url = self._archive_stage.GetGSUploadLocation()
    filenames = commands.GenerateStackTraces(
        self._build_root, self._current_board, test_tarball, archive_path,
        got_symbols)
    filenames.append(commands.ArchiveFile(test_tarball, archive_path))

    cros_build_lib.Info('Uploading artifacts to Google Storage...')
    download_url = self._archive_stage.GetDownloadUrl()
    for filename in filenames:
      try:
        commands.UploadArchivedFile(archive_path, upload_url, filename,
                                    self._archive_stage.debug, update_list=True)
        self.PrintBuildbotLink(download_url, filename)
      except cros_build_lib.RunCommandError as e:
        # Treat gsutil flake as a warning if it's the only problem.
        self._HandleExceptionAsWarning(e)

  def _PerformStage(self):
    # These directories are used later to archive test artifacts.
    test_results_dir = commands.CreateTestRoot(self._build_root)
    try:
      test_type = self._build_config['vm_tests']
      commands.RunTestSuite(self._build_root,
                            self._current_board,
                            self.GetImageDirSymlink(),
                            os.path.join(test_results_dir,
                                         'test_harness'),
                            test_type=test_type,
                            whitelist_chrome_crashes=self._chrome_rev is None,
                            archive_dir=self._archive_stage.bot_archive_root)

      if test_type == constants.FULL_AU_TEST_TYPE:
        commands.RunDevModeTest(
            self._build_root, self._current_board, self.GetImageDirSymlink())

    except Exception:
      cros_build_lib.Error(_VM_TEST_ERROR_MSG)
      raise
    finally:
      self._ArchiveTestResults(test_results_dir)


class TestTimeoutException(Exception):
  """Raised when a critical test times out."""
  pass


class InvalidTestConditionException(Exception):
  """Raised when pre-conditions for a test aren't met."""
  pass


class HWTestStage(BoardSpecificBuilderStage):
  """Stage that runs tests in the Autotest lab."""

  option_name = 'tests'
  config_name = 'hw_tests'

  PERF_RESULTS_EXTENSION = 'results'

  def __init__(self, options, build_config, board, archive_stage, suite):
    super(HWTestStage, self).__init__(options, build_config, board,
                                      suffix=' [%s]' % suite)
    self._archive_stage = archive_stage
    self._suite = suite
    # Bind this early so derived classes can override it.
    self._timeout = build_config['hw_tests_timeout']
    self.wait_for_results = True

  def _PrintFile(self, filename):
    with open(filename) as f:
      print f.read()

  def _SendPerfResults(self):
    """Sends the perf results from the test to the perf dashboard."""
    result_file_name = '%s.%s' % (self._suite,
                                  HWTestStage.PERF_RESULTS_EXTENSION)
    gs_results_file = '/'.join([self._archive_stage.GetGSUploadLocation(),
                                result_file_name])
    gs_context = gs.GSContext()
    gs_context.Copy(gs_results_file, self._options.log_dir)
    # Prints out the actual result from gs_context.Copy.
    logging.info('Copy of %s completed. Printing below:', result_file_name)
    self._PrintFile(os.path.join(self._options.log_dir, result_file_name))

  # Disable use of calling parents HandleStageException class.
  # pylint: disable=W0212
  def _HandleStageException(self, exception):
    """Override and don't set status to FAIL but FORGIVEN instead."""
    if (isinstance(exception, cros_build_lib.RunCommandError) and
        exception.result.returncode == 2 and
        not self._build_config['hw_tests_critical']):
      return self._HandleExceptionAsWarning(exception)
    else:
      return super(HWTestStage, self)._HandleStageException(exception)

  def DealWithTimeout(self, exception):
    if not self._build_config['hw_tests_critical']:
      return self._HandleExceptionAsWarning(exception)

    return super(HWTestStage, self)._HandleStageException(exception)


  def WaitForPreconditions(self):
    """Waits for preconditions for this test. Run before rest of stage"""
    if not self._archive_stage.WaitForHWTestUploads():
      raise InvalidTestConditionException('Missing uploads.')

  def _PerformStage(self):
    self.WaitForPreconditions()

    build = '/'.join([self._bot_id, self._archive_stage.GetVersion()])
    if self._options.remote_trybot and self._options.hwtest:
      debug = self._options.debug_forced
    else:
      debug = self._options.debug
    try:
      with cros_build_lib.SubCommandTimeout(self._timeout):
        commands.RunHWTestSuite(build, self._suite, self._current_board,
                                self._build_config['hw_tests_pool'],
                                self._build_config['hw_tests_num'],
                                self._build_config['hw_tests_file_bugs'],
                                self.wait_for_results,
                                debug)

        if self._build_config['hw_copy_perf_results']:
          self._SendPerfResults()

    except cros_build_lib.TimeoutError as exception:
      return self.DealWithTimeout(exception)


class AUTestStage(HWTestStage):
  """Stage for au hw test suites that requires special pre-processing."""

  def WaitForPreconditions(self):
    """Wait for payloads to be staged and uploads its au control files."""
    super(AUTestStage, self).WaitForPreconditions()
    local_archive_path = self._archive_stage.GetArchivePath()
    remote_archive_path = self._archive_stage.GetGSUploadLocation()

    with osutils.TempDirContextManager() as tempdir:
      tarball = commands.BuildAUTestTarball(
          self._build_root, self._current_board, tempdir,
          self._archive_stage.GetVersion(),
          remote_archive_path)
      tarball_name = commands.ArchiveFile(tarball, local_archive_path)
      commands.UploadArchivedFile(local_archive_path, remote_archive_path,
                                  tarball_name, self._archive_stage.debug,
                                  update_list=True)


class ASyncHWTestStage(HWTestStage, ForgivingBuilderStage):
  """Stage that fires and forgets hw test suites to the Autotest lab."""

  def __init__(self, options, build_config, board, archive_stage, suite):
    super(ASyncHWTestStage, self).__init__(self, options, build_config, board,
                                           archive_stage, suite)
    self.wait_for_results = False


class SDKPackageStage(bs.BuilderStage):
  """Stage that performs preparing and packaging SDK files"""

  # Version of the Manifest file being generated. Should be incremented for
  # Major format changes.
  MANIFEST_VERSION = '1'
  _EXCLUDED_PATHS = ('usr/lib/debug', 'usr/local/autotest', 'packages', 'tmp')

  def _PerformStage(self):
    tarball_name = 'built-sdk.tar.xz'
    tarball_location = os.path.join(self._build_root, tarball_name)
    chroot_location = os.path.join(self._build_root,
                                   constants.DEFAULT_CHROOT_DIR)
    board_location = os.path.join(chroot_location, 'build/amd64-host')
    manifest_location = os.path.join(self._build_root,
                                     '%s.Manifest' % tarball_name)

    # Create a tarball of the latest SDK.
    self.CreateSDKTarball(chroot_location, board_location, tarball_location)

    # Create a package manifest for the tarball.
    self.CreateManifestFromSDK(board_location, manifest_location)

    # Create toolchain packages.
    self.CreateRedistributableToolchains(chroot_location)

    # Make sure the regular user has the permission to read.
    cmd = ['chmod', 'a+r', tarball_location]
    cros_build_lib.SudoRunCommand(cmd, cwd=board_location)

  def CreateRedistributableToolchains(self, chroot_location):
    osutils.RmDir(os.path.join(chroot_location,
                               constants.SDK_TOOLCHAINS_OUTPUT),
                  ignore_missing=True)
    cros_build_lib.RunCommand(
        ['cros_setup_toolchains', '--create-packages',
         '--output-dir', os.path.join('/', constants.SDK_TOOLCHAINS_OUTPUT)],
        enter_chroot=True)

  def CreateSDKTarball(self, _chroot, sdk_path, dest_tarball):
    """Creates an SDK tarball from a given source chroot.

    Args:
      chroot: A chroot used for finding compression tool.
      sdk_path: Path to the root of newly generated SDK image.
      dest_tarball: Path of the tarball that should be created.
    """
    # TODO(zbehan): We cannot use xz from the chroot unless it's
    # statically linked.
    extra_args = ['--exclude=%s/*' % path for path in self._EXCLUDED_PATHS]
    # Options for maximum compression.
    extra_env = { 'XZ_OPT' : '-e9' }
    cros_build_lib.CreateTarball(
        dest_tarball, sdk_path, sudo=True, extra_args=extra_args,
        extra_env=extra_env)

  def CreateManifestFromSDK(self, sdk_path, dest_manifest):
    """Creates a manifest from a given source chroot.

    Args:
      sdk_path: Path to the root of the SDK to describe.
      dest_manifest: Path to the manifest that should be generated.
    """
    package_data = {}
    for key, version in portage_utilities.ListInstalledPackages(sdk_path):
      package_data.setdefault(key, []).append((version, {}))
    self._WriteManifest(package_data, dest_manifest)

  def _WriteManifest(self, data, manifest):
    """Encode manifest into a json file."""
    json_input = dict(version=self.MANIFEST_VERSION, packages=data)
    osutils.WriteFile(manifest, json.dumps(json_input))


class SDKTestStage(bs.BuilderStage):
  """Stage that performs testing an SDK created in a previous stage"""

  option_name = 'tests'

  def _PerformStage(self):
    tarball_location = os.path.join(self._build_root, 'built-sdk.tar.xz')
    new_chroot_cmd = ['cros_sdk', '--chroot', 'new-sdk-chroot']
    # Build a new SDK using the provided tarball.
    cmd = new_chroot_cmd + ['--download', '--replace', '--nousepkg',
        '--url', 'file://' + tarball_location]
    cros_build_lib.RunCommand(cmd, cwd=self._build_root)

    for board in self._boards:
      cros_build_lib.PrintBuildbotStepText(board)
      cmd = new_chroot_cmd + ['--', './setup_board',
          '--board', board, '--skip_chroot_upgrade']
      cros_build_lib.RunCommand(cmd, cwd=self._build_root)
      cmd = new_chroot_cmd + ['--', './build_packages',
          '--board', board, '--nousepkg', '--skip_chroot_upgrade']
      cros_build_lib.RunCommand(cmd, cwd=self._build_root)


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(BoardSpecificBuilderStage):
  """Archives build and test artifacts for developer consumption."""

  option_name = 'archive'
  _BUILDBOT_ARCHIVE = 'buildbot_archive'
  _TRYBOT_ARCHIVE = 'trybot_archive'

  @classmethod
  def GetArchiveRoot(cls, buildroot, trybot=False):
    """Return the location where trybot archive images are kept."""
    archive_base = cls._TRYBOT_ARCHIVE if trybot else cls._BUILDBOT_ARCHIVE
    return os.path.join(buildroot, archive_base)

  # This stage is intended to run in the background, in parallel with tests.
  def __init__(self, options, build_config, board, release_tag):
    super(ArchiveStage, self).__init__(options, build_config, board)
    self._release_tag = release_tag or ''
    self.prod_archive = self._options.buildbot and not self._options.debug
    self._archive_root = self.GetArchiveRoot(
        self._build_root, trybot=not self.prod_archive)
    self.bot_archive_root = os.path.join(self._archive_root, self._bot_id)

    if self._options.remote_trybot:
      self.debug = self._options.debug_forced
    else:
      self.debug = self._options.debug

    # Queues that are populated during the Archive stage.
    self._breakpad_symbols_queue = multiprocessing.Queue()
    self._hw_test_uploads_status_queue = multiprocessing.Queue()
    self._recovery_image_status_queue = multiprocessing.Queue()

    self._release_upload_queue = multiprocessing.Queue()
    self._upload_queue = multiprocessing.Queue()
    self._upload_symbols_queue = multiprocessing.Queue()
    self._hw_test_upload_queue = multiprocessing.Queue()

    # Queues that are populated by other stages.
    self._autotest_tarballs_queue = multiprocessing.Queue()
    self._full_autotest_tarball_queue = multiprocessing.Queue()

    # These variables will be initialized when the stage is run.
    self._archive_path = None
    self._pkg_dir = None

    # Precalculate the version number and save it in the cache. This ensures
    # that the function is only called once, even if we fork new processes.
    self.GetVersion()

  def AutotestTarballsReady(self, autotest_tarballs):
    """Tell Archive Stage that autotest tarball is ready.

    This must be called in order for archive stage to finish.

    Args:
      autotest_tarballs: The paths of the autotest tarballs.
    """
    self._autotest_tarballs_queue.put(autotest_tarballs)

  def FullAutotestTarballReady(self, full_autotest_tarball):
    """Tell Archive Stage that full autotest tarball is ready.

    This must be called in order for archive stage to finish when
    chromeos_offcial is true.

    Args:
      full_autotest_tarball: The paths of the full autotest tarball.
    """
    self._full_autotest_tarball_queue.put(full_autotest_tarball)

  @cros_build_lib.MemoizedSingleCall
  def GetVersion(self):
    """Calculate the full version string, including the milestone.

    If a release tag is present, we use it. Otherwise, we look it up from the
    checkout.

    Returns: The full version number. E.g. R26-2981.0.0-b123
    """
    verinfo = manifest_version.VersionInfo.from_repo(self._build_root)
    calc_version = self._release_tag or verinfo.VersionString()
    calc_version = 'R%s-%s' % (verinfo.chrome_branch, calc_version)

    # Non-versioned builds need the build number to uniquify the image.
    if not self._release_tag:
      calc_version += '-b%s' % self._options.buildnumber

    return calc_version

  def GetReleaseTag(self):
    """Gets the release tag for the archive stage.

    Returns: The unadorned version number. E.g. 2981.0.0
    """
    return self._release_tag

  def WaitForHWTestUploads(self):
    """Waits until artifacts needed for HWTest stage are uploaded.

    Returns:
      True if artifacts uploaded successfully.
      False otherwise.
    """
    cros_build_lib.Info('Waiting for uploads...')
    status = self._hw_test_uploads_status_queue.get()
    # Put the status back so other HWTestStage instances don't starve.
    self._hw_test_uploads_status_queue.put(status)
    return status

  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

  def _BreakpadSymbolsGenerated(self, success):
    """Signal that breakpad symbols have been generated.

    Arguments:
      success: True to indicate the symbols were generated, else False.
    """
    self._breakpad_symbols_queue.put(success)

  def WaitForBreakpadSymbols(self):
    """Wait for the breakpad symbols to be generated.

    Returns:
      True if the breakpad symbols were generated.
      False if the breakpad symbols were not generated within 20 mins.
    """
    success = False
    cros_build_lib.Info('Waiting for breakpad symbols...')
    try:
      # TODO: Clean this up so that we no longer rely on a timeout
      success = self._breakpad_symbols_queue.get(True, 1200)
    except Queue.Empty:
      cros_build_lib.Warning(
          'Breakpad symbols were not generated within timeout period.')
    return success

  def GetDownloadUrl(self):
    """Get the URL where we can download artifacts."""
    if self._options.buildbot or self._options.remote_trybot:
      upload_location = self.GetGSUploadLocation()
      return upload_location.replace('gs://', gs.PRIVATE_BASE_HTTPS_URL)
    else:
      return self.GetArchivePath()

  def _GetGSUtilArchiveDir(self):
    if self._options.archive_base:
      gs_base = self._options.archive_base
    elif (self._options.remote_trybot or
          self._build_config['gs_path'] == cbuildbot_config.GS_PATH_DEFAULT):
      gs_base = constants.DEFAULT_ARCHIVE_BUCKET
    else:
      return self._build_config['gs_path']

    return '%s/%s' % (gs_base, self._bot_id)

  def GetGSUploadLocation(self):
    """Get the Google Storage location where we should upload artifacts."""
    gsutil_archive = self._GetGSUtilArchiveDir()
    version = self.GetVersion()
    return '%s/%s' % (gsutil_archive, version)

  def GetArchivePath(self):
    return os.path.join(self.bot_archive_root, self.GetVersion())

  def _GetAutotestTarballs(self):
    """Get the paths of the autotest tarballs."""
    autotest_tarballs = None
    if self._options.build:
      cros_build_lib.Info('Waiting for autotest tarballs ...')
      autotest_tarballs = self._autotest_tarballs_queue.get()
      if autotest_tarballs:
        cros_build_lib.Info('Found autotest tarballs %r ...'
                            % autotest_tarballs)
      else:
        cros_build_lib.Info('No autotest tarballs found.')

    return autotest_tarballs

  def _GetFullAutotestTarball(self):
    """Get the paths of the full autotest tarball."""
    full_autotest_tarball = None
    if self._options.build:
      cros_build_lib.Info('Waiting for the full autotest tarball ...')
      full_autotest_tarball = self._full_autotest_tarball_queue.get()
      if full_autotest_tarball:
        cros_build_lib.Info('Found full autotest tarball %s ...'
                            % full_autotest_tarball)
      else:
        cros_build_lib.Info('No full autotest tarball found.')

    return full_autotest_tarball

  def _SetupArchivePath(self):
    """Create a fresh directory for archiving a build."""
    archive_path = self.GetArchivePath()

    if not archive_path:
      return None

    if self._options.buildbot:
      # Buildbot: Clear out any leftover build artifacts, if present.
      shutil.rmtree(archive_path, ignore_errors=True)
    else:
      # Clear the list of uploaded file if it exists
      osutils.SafeUnlink(os.path.join(archive_path,
                                      commands.UPLOADED_LIST_FILENAME))

    os.makedirs(archive_path)

    return archive_path

  def ArchiveMetadataJson(self):
    """Create a JSON of various metadata describing this build."""
    config = self._build_config

    target = os.path.join(self._archive_path, constants.METADATA_JSON)
    sdk_verinfo = cros_build_lib.LoadKeyValueFile(
        os.path.join(constants.SOURCE_ROOT, constants.SDK_VERSION_FILE),
        ignore_missing=True)
    json_input = {
        # Version of the metadata format.
        'metadata-version': '1',
        # Data for this build.
        'bot-config': config['name'],
        'bot-hostname': cros_build_lib.GetHostName(fully_qualified=True),
        'boards': config['boards'],
        'build-number': self._options.buildnumber,
        'builder-name': os.environ.get('BUILDBOT_BUILDERNAME'),
        'cros-version': self.GetVersion(),
        # Data for the toolchain used.
        'sdk-version': sdk_verinfo.get('SDK_LATEST_VERSION', '<unknown>'),
        'toolchain-url': sdk_verinfo.get('TC_PATH', '<unknown>'),
    }
    if len(config['boards']) == 1:
      toolchains = toolchain.GetToolchainsForBoard(config['boards'][0])
      json_input['toolchain-tuple'] = (
          toolchain.FilterToolchains(toolchains, 'default', True).keys() +
          toolchain.FilterToolchains(toolchains, 'default', False).keys())
    osutils.WriteFile(target, json.dumps(json_input))
    self._upload_queue.put([constants.METADATA_JSON])

  @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."""
    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 BuildAndArchiveChromeSysroot(self):
    """Generate and upload sysroot for building Chrome."""
    assert self._archive_path.startswith(self._build_root)
    in_chroot_path = git.ReinterpretPathForChroot(self._archive_path)
    cmd = ['cros_generate_sysroot', '--out-dir', in_chroot_path, '--board',
           self._current_board, '--package', constants.CHROME_CP]
    cros_build_lib.RunCommand(cmd, cwd=self._build_root, enter_chroot=True)
    self._upload_queue.put([constants.CHROME_SYSROOT_TAR])

  def ArchiveChromeEbuildEnv(self):
    """Generate and upload Chrome ebuild environment."""
    chrome_dir = self._SingleMatchGlob(
        os.path.join(self._pkg_dir, constants.CHROME_CP) + '-*')
    env_bzip = os.path.join(chrome_dir, 'environment.bz2')
    with osutils.TempDirContextManager() as tempdir:
      # Convert from bzip2 to tar format.
      bzip2 = cros_build_lib.FindCompressor(cros_build_lib.COMP_BZIP2)
      cros_build_lib.RunCommand(
          [bzip2, '-d', env_bzip, '-c'],
          log_stdout_to_file=os.path.join(tempdir, constants.CHROME_ENV_FILE))
      env_tar = os.path.join(self._archive_path, constants.CHROME_ENV_TAR)
      cros_build_lib.CreateTarball(env_tar, tempdir)
      self._upload_queue.put([os.path.basename(env_tar)])

  def _Initialize(self):
    """Do lazy initialization.  Called during _PerformStage()"""
    self._archive_path = self._SetupArchivePath()
    self._pkg_dir = os.path.join(
        self._build_root, constants.DEFAULT_CHROOT_DIR,
        'build', self._current_board, 'var', 'db', 'pkg')

  def _PerformStage(self):
    self._Initialize()

    buildroot = self._build_root
    config = self._build_config
    board = self._current_board
    debug = self.debug
    upload_url = self.GetGSUploadLocation()
    archive_path = self._archive_path
    image_dir = self.GetImageDirSymlink()
    release_upload_queue = self._release_upload_queue
    upload_queue = self._upload_queue
    upload_symbols_queue = self._upload_symbols_queue
    hw_test_upload_queue = self._hw_test_upload_queue
    bg_task_runner = parallel.BackgroundTaskRunner

    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
    #    \- ArchiveArtifactsForHWTesting
    #       \- ArchiveAutotestTarballs
    #       \- ArchivePayloads
    #       \- ArchiveMetadataJson
    #    \- ArchiveImageScripts
    #    \- ArchiveReleaseArtifacts
    #       \- ArchiveDebugSymbols
    #       \- ArchiveFirmwareImages
    #       \- BuildAndArchiveAllImages
    #          (builds recovery image first, then launches functions below)
    #          \- BuildAndArchiveFactoryImages
    #          \- ArchiveStandaloneTarballs
    #             \- ArchiveStandaloneTarball
    #          \- ArchiveZipFiles
    #          \- ArchiveHWQual
    #       \- PushImage (blocks on BuildAndArchiveAllImages)
    #    \- ArchiveStrippedChrome
    #    \- BuildAndArchiveChromeSysroot
    #    \- ArchiveChromeEbuildEnv

    def ArchiveAutotestTarballs():
      """Archives the autotest tarballs produced in BuildTarget."""
      autotest_tarballs = self._GetAutotestTarballs()
      if autotest_tarballs:
        for tarball in autotest_tarballs:
          hw_test_upload_queue.put([commands.ArchiveFile(tarball,
                                                         archive_path)])

    def ArchivePayloads():
      """Archives update payloads when they are ready."""
      if self._build_config['upload_hw_test_artifacts']:
        update_payloads_dir = tempfile.mkdtemp(prefix='cbuildbot')
        target_image_path = os.path.join(self.GetImageDirSymlink(),
                                         'chromiumos_test_image.bin')
        # For non release builds, we are only interested in generating payloads
        # for the purpose of imaging machines. This means we shouldn't generate
        # delta payloads for n-1->n testing.
        if self._build_config['build_type'] != constants.CANARY_TYPE:
          commands.GenerateFullPayload(
              buildroot, target_image_path, update_payloads_dir)
        else:
          commands.GenerateNPlus1Payloads(
              buildroot, self.bot_archive_root, target_image_path,
              update_payloads_dir)

        for payload in os.listdir(update_payloads_dir):
          full_path = os.path.join(update_payloads_dir, payload)
          hw_test_upload_queue.put([commands.ArchiveFile(full_path,
                                                         archive_path)])

    def ArchiveDebugSymbols():
      """Generate debug symbols and upload debug.tgz."""
      if config['archive_build_debug'] or config['vm_tests']:
        success = False
        try:
          commands.GenerateBreakpadSymbols(buildroot, board)
          success = True
        finally:
          self._BreakpadSymbolsGenerated(success)

        # Kick off the symbol upload process in the background.
        if config['upload_symbols']:
          upload_symbols_queue.put([])

        # Generate and upload tarball.
        filename = commands.GenerateDebugTarball(
            buildroot, board, archive_path, config['archive_build_debug'])
        release_upload_queue.put([filename])
      else:
        self._BreakpadSymbolsGenerated(False)

    def UploadSymbols():
      """Upload generated debug symbols."""
      if not debug:
        commands.UploadSymbols(buildroot, board, config['chromeos_official'])

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

      The factory zip file consists of the factory test image and the factory
      install image. Both are built here.
      """

      # Build factory test image and create symlink to it.
      factory_test_symlink = None
      if 'factory_test' in config['images']:
        alias = commands.BuildFactoryTestImage(buildroot, board, extra_env)
        factory_test_symlink = self.GetImageDirSymlink(alias)

      # 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 and upload factory zip.
      if factory_install_symlink and factory_test_symlink:
        image_root = os.path.dirname(factory_install_symlink)
        filename = commands.BuildFactoryZip(
            buildroot, board, archive_path, image_root)
        release_upload_queue.put([filename])

    def ArchiveStandaloneTarball(image_file):
      """Build and upload a single tarball."""
      release_upload_queue.put([commands.BuildStandaloneImageTarball(
          archive_path, image_file)])

    def ArchiveStandaloneTarballs():
      """Build and upload standalone tarballs for each image."""
      if config['upload_standalone_images']:
        inputs = []
        for image_file in glob.glob(os.path.join(image_dir, '*.bin')):
          if os.path.basename(image_file) != 'chromiumos_qemu_image.bin':
            inputs.append([image_file])
        parallel.RunTasksInProcessPool(ArchiveStandaloneTarball, inputs)

    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)
      release_upload_queue.put([image_zip])

      # Archive au-generator.zip.
      filename = 'au-generator.zip'
      shutil.copy(os.path.join(image_dir, filename), archive_path)
      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.
      autotest_built = config['build_tests'] and self._options.tests and (
          config['upload_hw_test_artifacts'] or config['archive_build_debug'])

      if config['chromeos_official'] and autotest_built:
        # Archive the full autotest tarball
        full_autotest_tarball = self._GetFullAutotestTarball()
        filename = commands.ArchiveFile(full_autotest_tarball, archive_path)
        cros_build_lib.Info('Archiving full autotest tarball locally ...')

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

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

      # For recovery image to be generated correctly, BuildRecoveryImage must
      # run before BuildAndArchiveFactoryImages.
      if 'base' in config['images']:
        commands.BuildRecoveryImage(buildroot, board, image_dir, extra_env)
        self._recovery_image_status_queue.put(True)

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

    def UploadArtifact(filename):
      """Upload generated artifact to Google Storage."""
      acl = None if config['internal'] else 'public-read'
      commands.UploadArchivedFile(archive_path, upload_url, filename, debug,
                                  update_list=True, acl=acl)

    def ArchiveArtifactsForHWTesting(num_upload_processes=6):
      """Archives artifacts required for HWTest stage."""
      success = False
      try:
        with bg_task_runner(UploadArtifact, queue=hw_test_upload_queue,
                            processes=num_upload_processes):

          # The metadata.json file created in ArchiveMetadataJson holds build
          # number and builder name, information needed by the HWTest stage to
          # report test failures.
          steps = [ArchiveAutotestTarballs, ArchivePayloads,
                   self.ArchiveMetadataJson]
          parallel.RunParallelSteps(steps)
        success = True
      finally:
        self._hw_test_uploads_status_queue.put(success)

    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)
      upload_queue.put([constants.IMAGE_SCRIPTS_TAR])

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

      # 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']
      commands.PushImages(buildroot,
                          board=board,
                          branch_name='master',
                          archive_url=upload_url,
                          dryrun=debug or not config['push_image'],
                          profile=self._options.profile or config['profile'],
                          sign_types=sign_types)

    def ArchiveReleaseArtifacts(num_upload_processes=10):
      with bg_task_runner(UploadArtifact, queue=release_upload_queue,
                          processes=num_upload_processes):
        steps = [ArchiveDebugSymbols, BuildAndArchiveAllImages,
                 ArchiveFirmwareImages]
        parallel.RunParallelSteps(steps)
      PushImage()

    def BuildAndArchiveArtifacts(num_upload_processes=10):
      # Run archiving steps in parallel.
      steps = [ArchiveReleaseArtifacts, ArchiveArtifactsForHWTesting]
      if config['images']:
        steps.extend(
            [self.ArchiveStrippedChrome, self.BuildAndArchiveChromeSysroot,
             self.ArchiveChromeEbuildEnv, ArchiveImageScripts])

      with bg_task_runner(UploadSymbols, queue=upload_symbols_queue,
                          processes=1):
        with bg_task_runner(UploadArtifact, queue=upload_queue,
                            processes=num_upload_processes):
          parallel.RunParallelSteps(steps)

    def MarkAsLatest():
      # Update and upload LATEST file.
      version = self.GetVersion()
      filename = 'LATEST-%s' % self._target_manifest_branch
      latest_path = os.path.join(self.bot_archive_root, filename)
      osutils.WriteFile(latest_path, version, mode='w')
      commands.UploadArchivedFile(
          self.bot_archive_root, self._GetGSUtilArchiveDir(), filename, debug)

    try:
      BuildAndArchiveArtifacts()
      MarkAsLatest()
    finally:
      commands.RemoveOldArchives(self.bot_archive_root,
                                 self._options.max_archive_builds)

  def _HandleStageException(self, exception):
    # Tell the HWTestStage not to wait for artifacts to be uploaded
    # in case ArchiveStage throws an exception.
    self._hw_test_uploads_status_queue.put(False)
    self._recovery_image_status_queue.put(False)
    return super(ArchiveStage, self)._HandleStageException(exception)


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

  option_name = 'prebuilts'
  config_name = 'prebuilts'

  def __init__(self, options, build_config, board, archive_stage, suffix=None):
    super(UploadPrebuiltsStage, self).__init__(options, build_config,
                                               board, suffix)
    self._archive_stage = archive_stage

  def GenerateCommonArgs(self):
    """Generate common prebuilt arguments."""
    generated_args = []
    if self._options.debug:
      generated_args.append('--debug')

    profile = self._options.profile or self._build_config['profile']
    if profile:
      generated_args.extend(['--profile', profile])

    # Generate the version if we are a manifest_version build.
    if self._build_config['manifest_version']:
      assert self._archive_stage, 'Archive stage missing for versioned build.'
      version = self._archive_stage.GetVersion()
      generated_args.extend(['--set-version', version])

    if self._build_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, builder, board):
    """Inner helper method to add upload_prebuilts args for 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 = []
    builder_config = cbuildbot_config.config[builder]
    if builder_config['prebuilts']:
      for slave_board in builder_config['boards']:
        if builder_config['master'] and slave_board == board:
          # Ignore self.
          continue

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

    return args

  def _PerformStage(self):
    """Uploads prebuilts for master and slave builders."""
    prebuilt_type = self._prebuilt_type
    board = self._current_board
    binhosts = []

    # Common args we generate for all types of builds.
    generated_args = self.GenerateCommonArgs()
    # Args we specifically add for public build types.
    public_args = []
    # Args we specifically add for private build types.
    private_args = []

    private_bucket = self._build_config['overlays'] in (
        constants.PRIVATE_OVERLAYS, constants.BOTH_OVERLAYS)

    # Distributed builders that use manifest-versions to sync with one another
    # share prebuilt logic by passing around versions.
    unified_master = False
    if cbuildbot_config.IsPFQType(prebuilt_type):
      # 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.
      if self._build_config['master'] and board == self._boards[-1]:
        unified_master = self._build_config['unified_manifest_version']
        generated_args.append('--sync-binhost-conf')
        # Difference here is that unified masters upload for both
        # public/private builders which have slightly different rules.
        if not unified_master:
          for builder in self._GetSlavesForMaster():
            generated_args.extend(self._AddOptionsForSlave(builder, board))
        else:
          public_builders, private_builders = \
              self._GetSlavesForUnifiedMaster()
          for builder in public_builders:
            public_args.extend(self._AddOptionsForSlave(builder, board))

          for builder in private_builders:
            private_args.extend(self._AddOptionsForSlave(builder, board))

      # Public pfqs should upload host preflight prebuilts.
      if (cbuildbot_config.IsPFQType(prebuilt_type)
          and 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 binhosts:
        if binhost:
          generated_args.extend(['--previous-binhost-url', binhost])

    if unified_master:
      # Upload the public/private prebuilts sequentially for unified master.
      # We set board to None as the unified master is always internal.
      commands.UploadPrebuilts(
          category=prebuilt_type, chrome_rev=self._chrome_rev,
          private_bucket=False, buildroot=self._build_root, board=None,
          extra_args=generated_args + public_args)
      commands.UploadPrebuilts(
          category=prebuilt_type, chrome_rev=self._chrome_rev,
          private_bucket=True, buildroot=self._build_root, board=board,
          extra_args=generated_args + private_args)
    else:
      # Upload prebuilts for all other types of builders.
      extra_args = private_args if private_bucket else public_args
      commands.UploadPrebuilts(
          category=prebuilt_type, chrome_rev=self._chrome_rev,
          private_bucket=private_bucket,
          buildroot=self._build_root, board=board,
          extra_args=generated_args + extra_args)


class DevInstallerPrebuiltsStage(UploadPrebuiltsStage):
  config_name = 'dev_installer_prebuilts'

  def _PerformStage(self):
    generated_args = generated_args = self.GenerateCommonArgs()
    commands.UploadDevInstallerPrebuilts(
        binhost_bucket=self._build_config['binhost_bucket'],
        binhost_key=self._build_config['binhost_key'],
        binhost_base_url=self._build_config['binhost_base_url'],
        buildroot=self._build_root,
        board=self._current_board,
        extra_args=generated_args)


class PublishUprevChangesStage(NonHaltingBuilderStage):
  """Makes uprev changes from pfq live for developers."""
  def _PerformStage(self):
    _, push_overlays = self._ExtractOverlays()
    if push_overlays:
      commands.UprevPush(self._build_root, push_overlays, self._options.debug)


class ReportStage(bs.BuilderStage):
  """Summarize all the builds."""

  _HTML_HEAD = """<html>
<head>
 <title>Archive Index: %(board)s / %(version)s</title>
</head>
<body>
<h2>Artifacts Index: %(board)s / %(version)s (%(config)s config)</h2>"""

  def __init__(self, options, build_config, archive_stages, version):
    bs.BuilderStage.__init__(self, options, build_config)
    self._archive_stages = archive_stages
    self._version = version if version else ''

  def _PerformStage(self):
    acl = None if self._build_config['internal'] else 'public-read'
    archive_urls = {}

    for board, archive_stage in sorted(self._archive_stages.iteritems()):
      head_data = {
          'board': board,
          'config': self._build_config['name'],
          'version': archive_stage.GetVersion(),
      }
      head = self._HTML_HEAD % head_data

      url = archive_stage.GetDownloadUrl()
      path = archive_stage.GetArchivePath()
      upload_url = archive_stage.GetGSUploadLocation()

      # Generate the index page needed for public reading.
      uploaded = os.path.join(path, commands.UPLOADED_LIST_FILENAME)
      if not os.path.exists(uploaded):
        # UPLOADED doesn't exist.  Normal if buildboard failed.
        logging.warning('board %s did not make it to the archive stage; '
                        'skipping', board)
        continue

      files = osutils.ReadFile(uploaded).splitlines() + [
          '.|Google Storage Index',
          '..|',
      ]
      index = os.path.join(path, 'index.html')
      commands.GenerateHtmlIndex(index, files, url_base=url, head=head)
      commands.UploadArchivedFile(path, upload_url, os.path.basename(index),
                                  debug=archive_stage.debug, acl=acl)

      archive_urls[board] = archive_stage.GetDownloadUrl() + '/index.html'

    results_lib.Results.Report(sys.stdout, archive_urls=archive_urls,
                               current_version=self._version)