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

"""Module containing the Chrome stages."""

from __future__ import print_function

import glob
import multiprocessing
import platform
import os

from chromite.cbuildbot import commands
from chromite.lib import constants
from chromite.lib import failures_lib
from chromite.cbuildbot import manifest_version
from chromite.lib import results_lib
from chromite.cbuildbot.stages import artifact_stages
from chromite.cbuildbot.stages import generic_stages
from chromite.cbuildbot.stages import sync_stages
from chromite.lib import cros_build_lib
from chromite.lib import cros_logging as logging
from chromite.lib import osutils
from chromite.lib import parallel
from chromite.lib import path_util

MASK_CHANGES_ERROR_SNIPPET = 'The following mask changes are necessary'
CHROMEPIN_MASK_PATH = os.path.join(constants.SOURCE_ROOT,
                                   constants.CHROMIUMOS_OVERLAY_DIR,
                                   'profiles', 'default', 'linux',
                                   'package.mask', 'chromepin')

class SyncChromeStage(generic_stages.BuilderStage,
                      generic_stages.ArchivingStageMixin):
  """Stage that syncs Chrome sources if needed."""

  option_name = 'managed_chrome'

  def __init__(self, builder_run, **kwargs):
    super(SyncChromeStage, self).__init__(builder_run, **kwargs)
    # PerformStage() will fill this out for us.
    # TODO(mtennant): Replace with a run param.
    self.chrome_version = None

  def HandleSkip(self):
    """Set run.attrs.chrome_version to chrome version in buildroot now."""
    self._run.attrs.chrome_version = self._run.DetermineChromeVersion()
    logging.debug('Existing chrome version is %s.',
                  self._run.attrs.chrome_version)
    self._WriteChromeVersionToMetadata()
    super(SyncChromeStage, self).HandleSkip()

  def _GetChromeVersionFromMetadata(self):
    """Return the Chrome version from metadata; None if is does not exist."""
    version_dict = self._run.attrs.metadata.GetDict().get('version')
    return None if not version_dict else version_dict.get('chrome')

  @failures_lib.SetFailureType(failures_lib.InfrastructureFailure)
  def PerformStage(self):
    chrome_atom_to_build = None
    if self._chrome_rev:
      if (self._chrome_rev == constants.CHROME_REV_SPEC and
          self._run.options.chrome_version):
        self.chrome_version = self._run.options.chrome_version
        logging.info('Using chrome version from options.chrome_version: %s',
                     self.chrome_version)
      else:
        self.chrome_version = self._GetChromeVersionFromMetadata()
        if self.chrome_version:
          logging.info('Using chrome version from the metadata dictionary: %s',
                       self.chrome_version)

      # Perform chrome uprev.
      try:
        chrome_atom_to_build = commands.MarkChromeAsStable(
            self._build_root, self._run.manifest_branch,
            self._chrome_rev, self._boards,
            chrome_version=self.chrome_version)
      except commands.ChromeIsPinnedUprevError as e:
        # If uprev failed due to a chrome pin, record that failure (so that the
        # build ultimately fails) but try again without the pin, to allow the
        # slave to test the newer chrome anyway).
        chrome_atom_to_build = e.new_chrome_atom
        if chrome_atom_to_build:
          results_lib.Results.Record(self.name, e)
          logging.PrintBuildbotStepFailure()
          logging.error('Chrome is pinned. Attempting to continue build for '
                        'chrome atom %s anyway but build will ultimately fail.',
                        chrome_atom_to_build)
          logging.info('Deleting pin file at %s and proceeding.',
                       CHROMEPIN_MASK_PATH)
          osutils.SafeUnlink(CHROMEPIN_MASK_PATH)
        else:
          raise

    kwargs = {}
    if self._chrome_rev == constants.CHROME_REV_SPEC:
      kwargs['revision'] = self.chrome_version
      logging.PrintBuildbotStepText('revision %s' % kwargs['revision'])
    else:
      if not self.chrome_version:
        self.chrome_version = self._run.DetermineChromeVersion()

      kwargs['tag'] = self.chrome_version
      logging.PrintBuildbotStepText('tag %s' % kwargs['tag'])

    useflags = self._run.config.useflags
    commands.SyncChrome(self._build_root, self._run.options.chrome_root,
                        useflags, **kwargs)
    if (self._chrome_rev and not chrome_atom_to_build and
        self._run.options.buildbot and
        self._run.config.build_type == constants.CHROME_PFQ_TYPE):
      logging.info('Chrome already uprevved. Nothing else to do.')
      raise failures_lib.ExitEarlyException(
          'SyncChromeStage finished and exited early.')

  def _WriteChromeVersionToMetadata(self):
    """Write chrome version to metadata and upload partial json file."""
    self._run.attrs.metadata.UpdateKeyDictWithDict(
        'version',
        {'chrome': self._run.attrs.chrome_version})
    self.UploadMetadata(filename=constants.PARTIAL_METADATA_JSON)

  def _Finish(self):
    """Provide chrome_version to the rest of the run."""
    # Even if the stage failed, a None value for chrome_version still
    # means something.  In other words, this stage tried to run.
    self._run.attrs.chrome_version = self.chrome_version
    self._WriteChromeVersionToMetadata()
    super(SyncChromeStage, self)._Finish()


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

  option_name = 'rietveld_patches'

  URL_BASE = 'https://codereview.chromium.org/%(id)s'

  def PerformStage(self):
    for spatch in ' '.join(self._run.options.rietveld_patches).split():
      patch, colon, subdir = spatch.partition(':')
      if not colon:
        subdir = 'src'
      url = self.URL_BASE % {'id': patch}
      logging.PrintBuildbotLink(spatch, url)
      commands.PatchChrome(self._run.options.chrome_root, patch, subdir)


class SimpleChromeWorkflowStage(generic_stages.BoardSpecificBuilderStage,
                                generic_stages.ArchivingStageMixin):
  """Run through the simple chrome workflow."""

  option_name = 'chrome_sdk'
  config_name = 'chrome_sdk'

  def __init__(self, *args, **kwargs):
    super(SimpleChromeWorkflowStage, self).__init__(*args, **kwargs)
    self._upload_queue = multiprocessing.Queue()
    self._pkg_dir = os.path.join(
        self._build_root, constants.DEFAULT_CHROOT_DIR,
        'build', self._current_board, 'var', 'db', 'pkg')
    if self._run.options.chrome_root:
      self.chrome_src = os.path.join(self._run.options.chrome_root, 'src')
      board_dir = 'out_%s' % self._current_board
      self.out_board_dir = os.path.join(
          self.chrome_src, board_dir, 'Release')

  def _BuildAndArchiveChromeSysroot(self):
    """Generate and upload sysroot for building Chrome."""
    assert self.archive_path.startswith(self._build_root)
    extra_env = {}
    if self._run.config.useflags:
      extra_env['USE'] = ' '.join(self._run.config.useflags)
    in_chroot_path = path_util.ToChrootPath(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,
                              extra_env=extra_env)
    self._upload_queue.put([constants.CHROME_SYSROOT_TAR])

  def _ArchiveChromeEbuildEnv(self):
    """Generate and upload Chrome ebuild environment."""
    files = glob.glob(os.path.join(self._pkg_dir, constants.CHROME_CP) + '-*')
    if not files:
      raise artifact_stages.NothingToArchiveException(
          'Failed to find package %s' % constants.CHROME_CP)
    if len(files) > 1:
      logging.PrintBuildbotStepWarnings()
      logging.warning('Expected one package for %s, found %d',
                      constants.CHROME_CP, len(files))

    chrome_dir = sorted(files)[-1]
    env_bzip = os.path.join(chrome_dir, 'environment.bz2')
    with osutils.TempDir(prefix='chrome-sdk-stage') 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 _VerifyChromeDeployed(self, tempdir):
    """Check to make sure deploy_chrome ran correctly."""
    if not os.path.exists(os.path.join(tempdir, 'chrome')):
      raise AssertionError('deploy_chrome did not run successfully!')

  def _VerifySDKEnvironment(self):
    """Make sure the SDK environment is set up properly."""
    # If the environment wasn't set up, then the output directory wouldn't be
    # created after 'gn gen'.
    # TODO: Make this check actually look at the environment.
    if not os.path.exists(self.out_board_dir):
      raise AssertionError('%s not created!' % self.out_board_dir)
    # Log args.gn for debugging.
    logging.info('ARGS.GN=\n%s',
                 osutils.ReadFile(os.path.join(self.out_board_dir, 'args.gn')))

  def _BuildChrome(self, sdk_cmd):
    """Use the generated SDK to build Chrome."""

    # Validate fetching of the SDK and setting everything up.
    sdk_cmd.Run(['true'])

    sdk_cmd.Run(['gclient', 'runhooks'])

    # Generate args.gn and ninja files.
    gn_cmd = os.path.join(self.chrome_src, 'buildtools', 'linux64', 'gn')
    gn_gen_cmd = '%s gen "%s" --args="$GN_ARGS"' % (gn_cmd, self.out_board_dir)
    sdk_cmd.Run(['bash', '-c', gn_gen_cmd])

    self._VerifySDKEnvironment()

    # Build chromium.
    sdk_cmd.Ninja()

  def _TestDeploy(self, sdk_cmd):
    """Test SDK deployment."""
    with osutils.TempDir(prefix='chrome-sdk-stage') as tempdir:
      # Use the TOT deploy_chrome.
      script_path = os.path.join(
          self._build_root, constants.CHROMITE_BIN_SUBDIR, 'deploy_chrome')
      sdk_cmd.Run([script_path, '--build-dir', self.out_board_dir,
                   '--staging-only', '--staging-dir', tempdir])
      self._VerifyChromeDeployed(tempdir)

  def _GenerateAndUploadMetadata(self):
    self.UploadMetadata(upload_queue=self._upload_queue,
                        filename=constants.PARTIAL_METADATA_JSON)

  def PerformStage(self):
    if platform.dist()[-1] == 'lucid':
      # Chrome no longer builds on Lucid. See crbug.com/276311
      print('Ubuntu lucid is no longer supported.')
      print('Please upgrade to Ubuntu Precise.')
      logging.PrintBuildbotStepWarnings()
      return

    steps = [self._BuildAndArchiveChromeSysroot, self._ArchiveChromeEbuildEnv,
             self._GenerateAndUploadMetadata]
    with self.ArtifactUploader(self._upload_queue, archive=False):
      parallel.RunParallelSteps(steps)

      if self._run.config.chrome_sdk_build_chrome:
        with osutils.TempDir(prefix='chrome-sdk-cache') as tempdir:
          cache_dir = os.path.join(tempdir, 'cache')
          extra_args = ['--cwd', self.chrome_src, '--sdk-path',
                        self.archive_path]
          sdk_cmd = commands.ChromeSDK(
              self._build_root, self._current_board, chrome_src=self.chrome_src,
              goma=self._run.config.chrome_sdk_goma,
              extra_args=extra_args, cache_dir=cache_dir)
          self._BuildChrome(sdk_cmd)
          self._TestDeploy(sdk_cmd)


class ChromeLKGMSyncStage(sync_stages.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._run.options.chrome_version)

    # We need a full buildspecs manager here as we need an initialized manifest
    # manager with paths to the spec.
    # TODO(mtennant): Consider registering as manifest_manager run param, for
    # consistency, but be careful that consumers do not get confused.
    # Currently only the "manifest_manager" from ManifestVersionedSync (and
    # subclasses) is used later in the flow.
    manifest_manager = manifest_version.BuildSpecsManager(
        source_repo=self.repo,
        manifest_repo=self._GetManifestVersionsRepoUrl(),
        build_names=self._run.GetBuilderIds(),
        incr_type='build',
        force=False,
        branch=self._run.manifest_branch)

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