# Copyright (c) 2014 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.

"""cbuildbot logic for uploading prebuilts and managing binhosts."""

from datetime import datetime
import glob
import os

from chromite.cbuildbot import cbuildbot_config
from chromite.cbuildbot import commands
from chromite.cbuildbot import constants
from chromite.cbuildbot import portage_utilities
from chromite.lib import cros_build_lib

_PREFLIGHT_BINHOST = 'PREFLIGHT_BINHOST'
_CHROME_BINHOST = 'CHROME_BINHOST'
_FULL_BINHOST = 'FULL_BINHOST'
_BINHOST_PACKAGE_FILE = ('/usr/share/dev-install/portage/make.profile/'
                         'package.installable')
_PRIVATE_BINHOST_CONF_DIR = ('src/private-overlays/chromeos-partner-overlay/'
                             'chromeos/binhost')
_PUBLIC_BINHOST_CONF_DIR = 'src/third_party/chromiumos-overlay/chromeos/binhost'


def _AddPackagesForPrebuilt(filename):
  """Add list of packages for upload.

  Process a file that lists all the packages that can be uploaded to the
  package prebuilt bucket and generates the command line args for
  upload_prebuilts.

  Args:
    filename: file with the package full name (category/name-version), one
              package per line.

  Returns:
    A list of parameters for upload_prebuilts. For example:
    ['--packages=net-misc/dhcp', '--packages=app-admin/eselect-python']
  """
  try:
    cmd = []
    with open(filename) as f:
      # Get only the package name and category as that is what upload_prebuilts
      # matches on.
      for line in f:
        atom = line.split('#', 1)[0].strip()
        try:
          cpv = portage_utilities.SplitCPV(atom)
        except ValueError:
          cros_build_lib.Warning('Could not split atom %r (line: %r)',
                                 atom, line)
          continue
        if cpv:
          cmd.extend(['--packages=%s/%s' % (cpv.category, cpv.package)])
    return cmd
  except IOError as e:
    cros_build_lib.Warning('Problem with package file %s' % filename)
    cros_build_lib.Warning('Skipping uploading of prebuilts.')
    cros_build_lib.Warning('ERROR(%d): %s' % (e.errno, e.strerror))
    return None


def _GenerateSdkVersion():
  """Generate a version string for sdk builds

  This needs to be global for test overrides.  It also needs to be done here
  rather than in upload_prebuilts because we want to put toolchain tarballs
  in a specific subdir and that requires keeping the version string in one
  place.  Otherwise we'd have to have the various scripts re-interpret the
  string and try and sync dates across.
  """
  return datetime.now().strftime('%Y.%m.%d.%H%M%S')


def UploadPrebuilts(category, chrome_rev, private_bucket, buildroot, **kwargs):
  """Upload Prebuilts for non-dev-installer use cases.

  Args:
    category: Build type. Can be [binary|full|chrome|chroot|paladin].
    chrome_rev: Chrome_rev of type constants.VALID_CHROME_REVISIONS.
    private_bucket: True if we are uploading to a private bucket.
    buildroot: The root directory where the build occurs.
    board: Board type that was built on this machine.
    extra_args: Extra args to pass to prebuilts script.
  """
  extra_args = ['--prepend-version', category]
  extra_args.extend(['--upload', 'gs://chromeos-prebuilt'])
  if private_bucket:
    extra_args.extend(['--private', '--binhost-conf-dir',
                       _PRIVATE_BINHOST_CONF_DIR])
  else:
    extra_args.extend(['--binhost-conf-dir', _PUBLIC_BINHOST_CONF_DIR])

  if category == constants.CHROOT_BUILDER_TYPE:
    extra_args.extend(['--sync-host',
                       '--upload-board-tarball'])
    tarball_location = os.path.join(buildroot, 'built-sdk.tar.xz')
    extra_args.extend(['--prepackaged-tarball', tarball_location])

    # See _GenerateSdkVersion comments for more details.
    version = _GenerateSdkVersion()
    extra_args.extend(['--set-version', version])

    # The local tarballs will be simply "<tuple>.tar.xz".  We need
    # them to be "<tuple>-<version>.tar.xz" to avoid collisions.
    for tarball in glob.glob(os.path.join(
        buildroot, constants.DEFAULT_CHROOT_DIR,
        constants.SDK_TOOLCHAINS_OUTPUT, '*.tar.*')):
      tarball_components = os.path.basename(tarball).split('.', 1)

      # Only add the path arg when processing the first tarball.  We do
      # this to get access to the tarball suffix dynamically (so it can
      # change and this code will still work).
      if '--toolchain-upload-path' not in extra_args:
        # Stick the toolchain tarballs into <year>/<month>/ subdirs so
        # we don't start dumping even more stuff into the top level.
        subdir = ('/'.join(version.split('.')[0:2]) + '/' +
                  '%%(target)s-%(version)s.' + tarball_components[1])
        extra_args.extend(['--toolchain-upload-path', subdir])

      arg = '%s:%s' % (tarball_components[0], tarball)
      extra_args.extend(['--toolchain-tarball', arg])

  if category == constants.CHROME_PFQ_TYPE:
    assert chrome_rev
    key = '%s_%s' % (chrome_rev, _CHROME_BINHOST)
    extra_args.extend(['--key', key.upper()])
  elif cbuildbot_config.IsPFQType(category):
    extra_args.extend(['--key', _PREFLIGHT_BINHOST])
  else:
    assert category in (constants.BUILD_FROM_SOURCE_TYPE,
                        constants.CHROOT_BUILDER_TYPE)
    extra_args.extend(['--key', _FULL_BINHOST])

  if category == constants.CHROME_PFQ_TYPE:
    extra_args.extend(['--packages=%s' % constants.CHROME_PN])

  kwargs.setdefault('extra_args', []).extend(extra_args)
  return _UploadPrebuilts(buildroot=buildroot, **kwargs)


class PackageFileMissing(Exception):
  """Raised when the dev installer package file is missing."""
  pass


def UploadDevInstallerPrebuilts(binhost_bucket, binhost_key, binhost_base_url,
                                buildroot, board, **kwargs):
  """Upload Prebuilts for dev-installer use case.

  Args:
    binhost_bucket: bucket for uploading prebuilt packages. If it equals None
                    then the default bucket is used.
    binhost_key: key parameter to pass onto upload_prebuilts. If it equals
                 None, then chrome_rev is used to select a default key.
    binhost_base_url: base url for upload_prebuilts. If None the parameter
                      --binhost-base-url is absent.
    buildroot: The root directory where the build occurs.
    board: Board type that was built on this machine.
    extra_args: Extra args to pass to prebuilts script.
  """
  extra_args = ['--prepend-version', constants.CANARY_TYPE]
  extra_args.extend(['--binhost-base-url', binhost_base_url])
  extra_args.extend(['--upload', binhost_bucket])
  extra_args.extend(['--key', binhost_key])

  filename = os.path.join(buildroot, 'chroot', 'build', board,
                          _BINHOST_PACKAGE_FILE.lstrip('/'))
  cmd_packages = _AddPackagesForPrebuilt(filename)
  if cmd_packages:
    extra_args.extend(cmd_packages)
  else:
    raise PackageFileMissing()

  kwargs.setdefault('extra_args', []).extend(extra_args)
  return _UploadPrebuilts(buildroot=buildroot, board=board, **kwargs)


def _UploadPrebuilts(buildroot, board, extra_args):
  """Upload prebuilts.

  Args:
    buildroot: The root directory where the build occurs.
    board: Board type that was built on this machine.
    extra_args: Extra args to pass to prebuilts script.
  """
  cwd = constants.CHROMITE_BIN_DIR
  cmd = ['./upload_prebuilts',
         '--build-path', buildroot]

  if board:
    cmd.extend(['--board', board])

  cmd.extend(extra_args)
  commands.RunBuildScript(buildroot, cmd, cwd=cwd, possibly_flaky=True)