# 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 SDK stages."""

import json
import os

from chromite.cbuildbot import constants
from chromite.cbuildbot import portage_utilities
from chromite.cbuildbot.stages import generic_stages
from chromite.lib import cros_build_lib
from chromite.lib import git
from chromite.lib import osutils


class SDKPackageStage(generic_stages.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', constants.AUTOTEST_BUILD_PATH,
                     '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):
    """Create the toolchain packages"""
    osutils.RmDir(os.path.join(chroot_location,
                               constants.SDK_TOOLCHAINS_OUTPUT),
                  ignore_missing=True)

    # We need to run this as root because the tool creates hard links to root
    # owned files and our bots enable security features which disallow that.
    # Specifically, these features cause problems:
    #  /proc/sys/kernel/yama/protected_nonaccess_hardlinks
    #  /proc/sys/fs/protected_hardlinks
    cmd = [
        git.ReinterpretPathForChroot(os.path.join(
            constants.CHROMITE_BIN_DIR, 'cros_setup_toolchains')),
        '--create-packages',
        '--output-dir', os.path.join('/', constants.SDK_TOOLCHAINS_OUTPUT),
    ]
    cros_build_lib.SudoRunCommand(cmd, 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(generic_stages.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,
                              extra_env=self._portage_extra_env)

    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,
                                extra_env=self._portage_extra_env)