Merge MVP script into cbuildbot.

buildbot/manifest_version.py

+#!/usr/bin/python
+# Copyright (c) 2011 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.
+
+"""
+A script to generate and store the manifests for the canary builders to use.
+"""
+
+import fnmatch
+import logging
+import logging.handlers
+import optparse
+import os
+import re
+import shutil
+import sys
+import tempfile
+
+import chromite.lib.cros_build_lib as cros_lib
+
+logging_format = '%(asctime)s - %(filename)s - %(levelname)-8s: %(message)s'
+date_format = '%Y/%m/%d %H:%M:%S'
+logging.basicConfig(level=logging.INFO, format=logging_format,
+                    datefmt=date_format)
+
+# Pattern for matching build name format. E.g, 12.3.4.5,1.0.25.3
+VER_PATTERN = '(\d+).(\d+).(\d+).(\d+)'
+
+class VersionUpdateException(Exception):
+  """Exception gets thrown for failing to update the version file"""
+  pass
+
+
+class InvalidOptionException(Exception):
+  """Exception gets thrown for invalid options"""
+  pass
+
+
+class GitCommandException(Exception):
+  """Exception gets thrown for a git command that fails to execute."""
+  pass
+
+class SrcCheckOutException(Exception):
+  """Exception gets thrown for failure to sync sources"""
+  pass
+
+class StatusUpdateException(Exception):
+  """Exception gets thrown for failure to update the status"""
+  pass
+
+class GenerateBuildSpecException(Exception):
+  """Exception gets thrown for failure to Generate a buildspec for the build"""
+  pass
+
+
+class GitMirror(object):
+  """ A Class to deal with the source tree/mirror setup and sync repos
+    Args:
+      mirror_dir: location for setting up git mirror
+      git_server: gitserver URI information
+      manifest_repo: repo to fetch the manifests from
+      manifest_file: manifest_file to use for syncing
+  """
+  def __init__(self, mirror_dir, repo_url, manifest_file='full.xml'):
+    self.mirror_dir = mirror_dir
+    self.repo_url = repo_url
+    self.manifest_file = manifest_file
+    self.InitMirrorRepos()
+
+  def InitMirrorRepos(self):
+    """Initialize the git mirroring"""
+    if not os.path.exists(self.mirror_dir):
+      os.makedirs(self.mirror_dir)
+      logging.debug('git mirror does not exist. Creating it for the first time')
+
+    if not os.path.exists(os.path.join(self.mirror_dir, '.repo')):
+      cros_lib.RunCommand(['repo', 'init', '-u', self.repo_url, '-m',
+                           self.manifest_file, '--mirror'], cwd=self.mirror_dir,
+                           input='\n\ny\n')
+
+  def SyncMirror(self):
+    """Sync/update the git mirror location"""
+    cros_lib.RunCommand(['repo', 'sync'], cwd=self.mirror_dir)
+
+
+class VersionInfo(object):
+  """Class to encapsualte the chrome os version info
+    You can instantiate this class in two ways.
+    1)using a version file, specifically chromeos_version.sh,
+    which contains the version information.
+    2) just passing in the 4 version components (major, minor, sp and patch)
+    Args:
+      ver_maj: major version
+      ver_min: minor version
+      ver_sp:  sp version
+      ver_patch: patch version
+      version_file: version file location.
+  """
+  def __init__(self, ver_maj=0, ver_min=0, ver_sp=0, ver_patch=0,
+               incr_type=None, version_file=None):
+    self.ver_maj = ver_maj
+    self.ver_min = ver_min
+    self.ver_sp = ver_sp
+    self.ver_patch = ver_patch
+    self.incr_type = incr_type
+    if version_file:
+      self.version_file = version_file
+      self.load()
+
+  def FindValue(self, key, line):
+    """Given the key find the value from the line, if it finds key = value
+    Args:
+      key: key to look for
+      line: string to search
+    returns:
+       None: on a non match
+       value: for a matching key
+    """
+    regex = '.*(%s)\s*=\s*(\d+)$' % key
+
+    match = re.match(regex, line)
+    if match:
+      return match.group(2)
+    return None
+
+  def load(self):
+    """Read the version file and set the version components"""
+    with open(self.version_file, 'r') as version_fh:
+      for line in version_fh:
+        if not line.strip():
+          continue
+
+        match = self.FindValue('CHROMEOS_VERSION_MAJOR', line)
+        if match:
+          self.ver_maj = match
+          logging.debug('Set the major version to:%s', self.ver_maj)
+          continue
+
+        match = self.FindValue('CHROMEOS_VERSION_MINOR', line)
+        if match:
+          self.ver_min = match
+          logging.debug('Set the minor version to:%s', self.ver_min)
+          continue
+
+        match = self.FindValue('CHROMEOS_VERSION_BRANCH', line)
+        if match:
+          self.ver_sp = match
+          logging.debug('Set the sp version to:%s', self.ver_sp)
+          continue
+
+        match = self.FindValue('CHROMEOS_VERSION_PATCH', line)
+        if match:
+          self.ver_patch = match
+          logging.debug('Set the patch version to:%s', self.ver_patch)
+          continue
+    logging.debug(self.VersionString())
+
+  def IncrementVersion(self):
+    """Updates the version file by incrementing the patch component"""
+    if not self.version_file:
+      raise VersionUpdateException('Cannot call IncrementVersion without '
+                                   'an associated version_file')
+    if not self.incr_type:
+      raise VersionUpdateException('Need to specify the part of the version to'
+                                   'increment')
+
+    if self.incr_type == 'branch':
+      self.ver_sp = str(int(self.ver_sp) + 1)
+      self.ver_patch = '0'
+    if self.incr_type == 'patch':
+      self.ver_patch = str(int(self.ver_patch) + 1)
+    temp_file = tempfile.mkstemp(suffix='mvp', prefix='tmp', dir=None,
+                                 text=True)[1]
+    with open(self.version_file, 'r') as source_version_fh:
+      with open(temp_file, 'w') as temp_fh:
+        for line in source_version_fh:
+          old_patch = self.FindValue('CHROMEOS_VERSION_PATCH', line)
+          if old_patch:
+            temp_fh.write(line.replace(old_patch, self.ver_patch, 1))
+            continue
+
+          old_sp = self.FindValue('CHROMEOS_VERSION_BRANCH', line)
+          if old_sp:
+            temp_fh.write(line.replace(old_sp, self.ver_sp, 1))
+            continue
+
+          temp_fh.write(line)
+        temp_fh.close()
+      source_version_fh.close()
+    shutil.copyfile(temp_file, self.version_file)
+    os.unlink(temp_file)
+    return self.VersionString()
+
+  def VersionString(self):
+    """returns the version string"""
+    return '%s.%s.%s.%s' % (self.ver_maj, self.ver_min, self.ver_sp,
+                            self.ver_patch)
+  def DirPrefix(self):
+    """returns the sub directory suffix in manifest-versions"""
+    return '%s.%s' % (self.ver_maj, self.ver_min)
+
+  def BuildPrefix(self):
+    """returns the build prefix to match the buildspecs in  manifest-versions"""
+    if self.incr_type == 'patch':
+      return '%s.%s.%s' % (self.ver_maj, self.ver_min, self.ver_sp)
+
+    if self.incr_type == 'branch':
+      return '%s.%s' % (self.ver_maj, self.ver_min)
+
+    return None
+
+
+class SpecsInfo(object):
+  """Class that contains information about the buildspecs
+    Args:
+      working_dir: location of the buildspecs location
+      build_name: name of the build that we will be dealing with
+      dir_prefix: prefix of the version for sub-directory location
+      build_prefix: prefix of the build version for build specs matching
+  """
+  def __init__(self, working_dir, ver_manifests, build_name, dir_prefix,
+               build_prefix):
+    self.working_dir = working_dir
+    self.ver_manifests = ver_manifests
+    self.build_name = build_name
+    self.dir_prefix = dir_prefix
+    self.build_prefix = build_prefix
+    self.root_dir = os.path.join(self.working_dir, self.ver_manifests)
+    self.all_specs_dir = os.path.join(self.root_dir, 'buildspecs',
+                                      self.dir_prefix)
+    self.pass_dir = os.path.join(self.root_dir, 'build-name', self.build_name,
+                                 'pass', self.dir_prefix)
+    self.fail_dir = os.path.join(self.root_dir, 'build-name', self.build_name,
+                                 'fail', self.dir_prefix)
+    self.inflight_dir = os.path.join(self.root_dir, 'build-name',
+                                     self.build_name, 'inflight',
+                                     self.dir_prefix)
+    logging.debug('Build Specs Dir = %s', self.all_specs_dir)
+
+
+class BuildSpecs(object):
+  """ Class to manage buildspecs
+    Args:
+      working_dir:location where the ver_manifests repo is synced to
+      ver_manifests: Name of the ver_manifests repo. Default: manifest-versions
+      build_name: Name of the build that we are interested in. E.g., x86-alex
+      dir_prefix: prefix of the version numbers for sub directory look up
+      build_prefix: prefix of the build version for build specs matching
+      incr_type: part of the version to increment. 'patch or branch'
+  """
+  def __init__(self, working_dir, ver_manifests, build_name, dir_prefix,
+               build_prefix, incr_type):
+    self.specs_info = SpecsInfo(working_dir, ver_manifests, build_name,
+                                dir_prefix, build_prefix)
+    self.all = self.GetMatchingSpecs(self.specs_info.all_specs_dir, incr_type)
+    self.latest = '0.0.0.0'
+    self.incr_type = incr_type
+
+    if self.all:
+      self.latest = self.all[-1]
+    self.all = set(self.GetMatchingSpecs(self.specs_info.all_specs_dir,
+                                         self.incr_type))
+    self.passed = self.GetMatchingSpecs(self.specs_info.pass_dir,
+                                        self.incr_type)
+    self.failed = self.GetMatchingSpecs(self.specs_info.fail_dir,
+                                        self.incr_type)
+    self.inflight = self.GetMatchingSpecs(self.specs_info.inflight_dir,
+                                          self.incr_type)
+    self.processed = sorted((self.passed + self.failed + self.inflight),
+                            key=lambda s: map(int, s.split('.')))
+    self.last_processed = '0.0.0.0'
+    if self.processed:
+      self.last_processed = self.processed[-1]
+    logging.debug('Last processed build for %s is %s' %
+                  (build_name, self.last_processed))
+
+    difference = list(self.all.difference(set(self.processed)))
+
+    for build in difference[:]:
+      build1 = map(int, build.split("."))
+      build2 = map(int, self.last_processed.split("."))
+
+      if cmp(build1 , build2) == 1:
+        logging.debug('Still need to build %s' % build)
+      else:
+        logging.debug('Ignoring build %s less than %s' %
+                      (build, self.last_processed))
+        difference.remove(build)
+
+    self.unprocessed = sorted(difference, key=lambda s: map(int, s.split('.')))
+
+  def GetMatchingSpecs(self, specs_info, incr_type):
+    """Returns the sorted list of buildspecs that match '*.xml'
+      Args:
+        specs_info: SpecsInfo object for the buildspecs location information.
+    """
+    matched_manifests = []
+    if os.path.exists(specs_info):
+      all_manifests = os.listdir(specs_info)
+      match_string = self.specs_info.build_prefix + '.*.xml'
+
+      if incr_type == 'branch':
+         match_string = self.specs_info.build_prefix + '.*.0.xml'
+
+      matched_manifests = fnmatch.filter(
+          all_manifests, match_string)
+      matched_manifests = [os.path.splitext(m)[0] for m in matched_manifests]
+
+    return matched_manifests
+
+  def FindNextBuild(self, latest=False):
+    """"Find the next build to build from unprocessed buildspecs
+      Args:
+        latest: True of False. (Returns the last known build on latest =True
+      Returns:
+        Returns the next build to be built or None
+    """
+    if not self.unprocessed:
+      return None
+
+    if latest:
+      return self.unprocessed[-1]
+
+    return self.unprocessed[0]
+
+  def ExistsBuildSpec(self, build_number):
+    """"Find out if the build_number exists in existing buildspecs
+      Args:
+        build_number: build number to check for existence of build spec
+      Returns:
+        True if the buildspec exists, False if it doesn't
+    """
+    return build_number in self.all
+
+
+class BuildSpecsManager(object):
+  """A Class to manage buildspecs and their states
+    Args:
+      working_dir: location of the buildspecs repo
+      build_name: build_name e.g., x86-mario, x86-mario-factory
+      dir_prefix: version prefix to match for the sub directories
+      build_prefix: prefix of the build version for build specs matching
+  """
+
+  def __init__(self, working_dir, ver_manifests, build_name, dir_prefix,
+               build_prefix):
+    self.specs_info = SpecsInfo(working_dir, ver_manifests, build_name,
+                                dir_prefix, build_prefix)
+
+  def SetUpSymLinks(self, src_file, dest_file, remove_file=None):
+    """Setting up symlinks for various statuses in the git repo
+      Args:
+        status: status type to set to, (one of inflight, pass, fail)
+        src_file: source for the symlink
+        dest_file: destination for the symlink
+        remove_file: symlink that needs to be deleted for clearing the old state
+    """
+    dest_dir = os.path.dirname(dest_file)
+    if os.path.lexists(dest_file):
+      os.unlink(dest_file)
+
+    if not os.path.exists(dest_dir):
+      os.makedirs(dest_dir)
+    rel_src_file = os.path.relpath(src_file, dest_dir)
+    logging.debug('Linking %s to %s', rel_src_file, dest_file)
+    os.symlink(rel_src_file, dest_file)
+
+    if remove_file and os.path.lexists(remove_file):
+      logging.debug('REMOVE: Removing  %s', remove_file)
+      os.unlink(remove_file)
+
+
+  def SetInFlight(self, version):
+    """Marks a buildspec as inflight by creating a symlink in 'inflight' dir
+      Args:
+        version: version of the buildspec to mark as inflight
+    """
+    dest_file = '%s.xml' % os.path.join(self.specs_info.inflight_dir, version)
+    src_file = '%s.xml' % os.path.join(self.specs_info.all_specs_dir, version)
+    logging.debug('Setting build in flight  %s: %s', src_file, dest_file)
+    self.SetUpSymLinks(src_file, dest_file)
+
+  def SetFailed(self, version):
+    """Marks a buildspec as failed by creating a symlink in 'fail' dir
+      Args:
+        version: version of the buildspec to mark as failed
+    """
+    dest_file = '%s.xml' % os.path.join(self.specs_info.fail_dir, version)
+    src_file = '%s.xml' % os.path.join(self.specs_info.all_specs_dir, version)
+    remove_file = '%s.xml' % os.path.join(self.specs_info.inflight_dir, version)
+    logging.debug('Setting build to failed  %s: %s', src_file, dest_file)
+    self.SetUpSymLinks(src_file, dest_file, remove_file)
+
+  def SetPassed(self, version):
+    """Marks a buildspec as failed by creating a symlink in 'pass' dir
+      Args:
+        version: version of the buildspec to mark as passed
+    """
+    dest_file = '%s.xml' % os.path.join(self.specs_info.pass_dir, version)
+    src_file = '%s.xml' % os.path.join(self.specs_info.all_specs_dir, version)
+    remove_file = '%s.xml' % os.path.join(self.specs_info.inflight_dir, version)
+    logging.debug('Setting build to passed  %s: %s', src_file, dest_file)
+    self.SetUpSymLinks(src_file, dest_file, remove_file)
+
+
+def CloneGitRepo(working_dir, repo_url):
+  """"Clone Given git repo
+    Args:
+      repo: git repo to clione
+      git_server: git server URL
+      repo_dir: location where it should be cloned to
+  """
+  if not os.path.exists(working_dir):
+    os.makedirs(working_dir)
+  cros_lib.RunCommand(['git', 'clone', repo_url], cwd=working_dir)
+
+def PushChanges(git_repo, message, use_repo=False, dry_run=True):
+  """Do the final commit into the git repo
+      Args:
+        git_repo: git repo to push
+        message: Commit message
+        use_repo: use repo tool for pushing changes. Default: False
+    raises: GitCommandException
+  """
+  branch = 'temp_auto_checkin_branch'
+  try:
+    if use_repo:
+      cros_lib.RunCommand(['repo', 'start', branch, '.'], cwd=git_repo)
+      cros_lib.RunCommand(['repo', 'sync', '.'], cwd=git_repo)
+      cros_lib.RunCommand(['git', 'config', 'push.default', 'tracking'],
+                          cwd=git_repo)
+    else:
+      cros_lib.RunCommand(['git', 'pull', '--force'], cwd=git_repo)
+    cros_lib.RunCommand(['git', 'add', '-A'], cwd=git_repo)
+    cros_lib.RunCommand(['git', 'commit', '-am', message], cwd=git_repo)
+
+    push_cmd = ['git', 'push', '--verbose']
+    if dry_run: push_cmd.append('--dry-run')
+    cros_lib.RunCommand(push_cmd, cwd=git_repo)
+  except cros_lib.RunCommandError, e:
+    err_msg = 'Failed to commit to %s' % e.message
+    logging.error(err_msg)
+    git_status = cros_lib.RunCommand(['git', 'status'], cwd=git_repo)
+    logging.error('Current repo %s status: %s', git_repo, git_status)
+    CleanGitChanges(git_repo)
+    raise GitCommandException(err_msg)
+  finally:
+    if use_repo:
+      cros_lib.RunCommand(['repo', 'abandon', branch], cwd=git_repo)
+
+def CleanGitChanges(git_repo):
+  """"Clean git repo chanages
+    Args:
+      git_repo: location of the git repo to clean
+    raises: GitCommandException: when fails to clean
+  """
+  try:
+    cros_lib.RunCommand(['git', 'clean', '-d', '-f'], cwd=git_repo)
+    cros_lib.RunCommand(['git', 'reset', '--hard', 'HEAD'], cwd=git_repo)
+  except cros_lib.RunCommandError, e:
+    err_msg = 'Failed to clean git repo %s' % e.message
+    logging.error(err_msg)
+    raise GitCommandException(err_msg)
+
+
+def SetLogFileHandler(logfile):
+  """This sets the logging handler to a file.
+    define a Handler which writes INFO messages or higher to the sys.stderr
+    Add the log message handler to the logger
+    Args:
+      logfile: name of the logfile to open
+  """
+  logfile_handler = logging.handlers.RotatingFileHandler(logfile, backupCount=5)
+  logfile_handler.setLevel(logging.DEBUG)
+  logfile_handler.setFormatter(logging.Formatter(logging_format))
+  logging.getLogger().addHandler(logfile_handler)
+
+
+def CheckOutSources(cros_source, repo_url, source_dir, branch,
+                    manifest_file='full.xml', retries=0):
+  """"Fetches the sources from the git server using repo tool
+    Args:
+      cros_source: GitMirror Object
+      source_dir: Location to sync the sources to
+      branch: branch to use for the manifest.xml for repo tool
+      manifest_repo: repo to use for manifest files
+      manifest_file: manifest file to use for the file definition
+      retries: Number of times to try to fetch sources
+  """
+  while True:
+    if not os.path.exists(source_dir):
+      os.makedirs(source_dir)
+    try:
+      cros_source.SyncMirror()
+      cros_lib.RunCommand(['repo', 'init', '-u', repo_url, '-b', branch, '-m',
+                           manifest_file, '--reference',
+                           cros_source.mirror_dir], cwd=source_dir,
+                           input='\n\ny\n')
+      cros_lib.RunCommand(['repo', 'sync'], cwd=source_dir)
+      break
+    except cros_lib.RunCommandError, e:
+      if retries < 1:
+        err_msg = 'Failed to sync sources %s' % e.message
+        logging.error(err_msg)
+        raise SrcCheckOutException(err_msg)
+      logging.info('Failed to sync sources %s', e.message)
+      logging.info('But will try  %d times', retries)
+      CleanUP(source_dir)
+      retries = retries - 1
+
+def ExportManifest(source_dir, output_file):
+  """Exports manifests file
+      Args:
+        source_dir: repo root
+        output_file: output_file to out put the manifest to
+  """
+  cros_lib.RunCommand(['repo', 'manifest', '-r', '-o', output_file],
+                      cwd=source_dir)
+
+
+def SetupExistingBuildSpec(build_specs_manager, next_build):
+  build_specs_manager.SetInFlight(next_build)
+  commit_message = 'Automatic: Start %s %s' % (
+      build_specs_manager.specs_info.build_name, next_build)
+  PushChanges(build_specs_manager.specs_info.root_dir, commit_message)
+
+
+def GenerateNewBuildSpec(source_dir, branch, latest_build, build_specs_root,
+                         build_specs_manager, cros_source, version_info,
+                         increment_version):
+  """Generates a new buildspec for the builders to consume
+    Checks to see, if there are new changes that need to be built from the last
+    time another buildspec was created. Updates the version number in version
+    number file. Generates the manifest as the next buildspecs. pushes it to git
+    and returns the next build spec number
+    If there are no new changes returns None
+  Args:
+    source_dir: location of the source tree root
+    branch: branch to sync the sources to
+    latest_build: latest known build to match the latest sources against
+    build_specs_root: location of the build specs root
+    build_specs_manager: BuildSpecsManager object
+    cros_source: GitMirror object
+    version_info: VersionInfo Object
+    increment_version: True or False for incrementing the chromeos_version.sh
+  Returns:
+    next build number: on new changes or
+    None: on no new changes
+  """
+  temp_manifest_file = tempfile.mkstemp(suffix='mvp', text=True)[1]
+
+  ExportManifest(source_dir, temp_manifest_file)
+
+  latest_spec_file = '%s.xml' % os.path.join(
+      build_specs_manager.specs_info.all_specs_dir, latest_build)
+
+  logging.debug('Calling DiffManifests with %s, %s', latest_spec_file,
+                temp_manifest_file)
+  if not (latest_build == '0.0.0.0' or
+          DiffManifests(temp_manifest_file, latest_spec_file)):
+    return None
+
+  next_version = version_info.VersionString()
+
+  if increment_version:
+    next_version = version_info.IncrementVersion()
+    logging.debug('Incremented version number to  %s', next_version)
+    message = 'Automatic: Updating the new version number %s' % next_version
+    PushChanges(os.path.dirname(version_info.version_file), message, True)
+    CheckOutSources(cros_source, source_dir, branch)
+
+  next_spec_file = '%s.xml' % os.path.join(
+      build_specs_manager.specs_info.all_specs_dir, next_version)
+  if not os.path.exists(os.path.dirname(next_spec_file)):
+    os.makedirs(os.path.dirname(next_spec_file))
+  ExportManifest(source_dir, next_spec_file)
+  message = 'Automatic: Buildspec %s. Created by %s' % (
+      next_version, build_specs_manager.specs_info.build_name)
+  logging.debug('Created New Build Spec %s', message)
+
+  build_specs_manager.SetInFlight(next_version)
+  PushChanges(build_specs_root, message)
+  return next_version
+
+
+def DiffManifests(manifest1, manifest2):
+  """Diff two manifest files. excluding the revisions to manifest-verisons.git
+    Args:
+      manifest1: First manifest file to compare
+      manifest2: Second manifest file to compare
+    Returns:
+      True: If the manifests are different
+      False: If the manifests are same
+  """
+  black_list = ['manifest-versions']
+  blacklist_pattern = re.compile(r'|'.join(black_list))
+  with open(manifest1, 'r') as manifest1_fh:
+    with open(manifest2, 'r') as manifest2_fh:
+      for (line1, line2) in zip(manifest1_fh, manifest2_fh):
+        if blacklist_pattern.search(line1):
+          logging.debug('%s ignored %s', line1, line2)
+          continue
+
+        if line1 != line2:
+          return True
+      return False
+
+
+def SetStatus(build_version, status, working_dir, ver_manifests, build_name):
+  """Set the status of a particular build by moving the build_spec files around
+      Args:
+        build_version: version of the build that we should set the status for
+        status: status to set. One of 'pass|fail'
+        working_dir: working dir where our version-manifests repos are synced
+        ver_manifests: name of the version manifests repo
+        build_name: Name of the build that we are settting the status for
+  """
+  logging.info('Setting Status for %s as %s', build_version, status)
+  match = re.search(VER_PATTERN, build_version)
+  logging.debug('Matched %s - %s - %s - %s', match.group(1), match.group(2),
+                match.group(3), match.group(4))
+  version_info = VersionInfo(ver_maj=match.group(1), ver_min=match.group(2),
+                             ver_sp=match.group(3), ver_patch=match.group(4))
+  logging.debug('Using Version: %s', version_info.VersionString())
+  logging.debug('Using Directory Prefix: %s', version_info.DirPrefix())
+  logging.debug('Using Build Prefix: %s', version_info.BuildPrefix())
+
+  build_specs_manager = BuildSpecsManager(working_dir, ver_manifests,
+                                          build_name, version_info.DirPrefix(),
+                                          version_info.BuildPrefix())
+  if status == 'pass':
+    build_specs_manager.SetPassed(build_version)
+  if status == 'fail':
+    build_specs_manager.SetFailed(build_version)
+
+  commit_message = 'Automatic checkin: status = %s build_version %s for %s' % (
+      status, build_version, build_name)
+  PushChanges(build_specs_manager.specs_info.root_dir, commit_message)
+
+
+def RemoveDirs(dir_name):
+  """Remove directories recursively, if they exist"""
+  if os.path.exists(dir_name):
+    shutil.rmtree(dir_name)
+
+def CleanUP(source_dir=None, working_dir=None, git_mirror_dir=None):
+  """Clean  up of all the directories that are created by this script
+    Args:
+      source_dir: directory where the sources are. Default: None
+      working_dir: directory where manifest-versions is. Default: None
+      git_mirror_dir: directory where git mirror is setup. Default: None
+  """
+  if source_dir:
+    logging.debug('Cleaning source dir = %s', source_dir)
+    RemoveDirs(source_dir)
+
+  if working_dir:
+    logging.debug('Cleaning working dir = %s', working_dir)
+    RemoveDirs(working_dir)
+
+  if git_mirror_dir:
+    logging.debug('Cleaning git mirror dir = %s', git_mirror_dir)
+    RemoveDirs(git_mirror_dir)
+
+def GenerateWorkload(tmp_dir, source_repo, manifest_repo,
+                     branch, version_file,
+                     board, incr_type, latest=False,
+                     retries=0):
+  """Function to see, if there are any new builds that need to be built.
+    Args:
+      tmp_dir: Temporary working directory, best shared with GenerateWorkload
+      source_repo: git URL to repo with source code
+      manifest_repo: git URL to repo with manifests/status values
+      branch: Which branch to build ('master' or mainline)
+      version_file: location of chromeos_version.sh
+      board: name of the board
+      incr_type: part of the version number to increment 'patch or branch'
+      latest: Whether we need to handout the latest build. Default: False
+      retries: Number of retries for updating the status
+    Returns:
+      next_build: a string of the next build number for the builder to consume
+                  or None in case of no need to build.
+    Raises:
+      GenerateBuildSpecException in case of failure to generate a buildspec
+  """
+
+  ver_manifests=os.path.basename(manifest_repo)
+
+  git_mirror_dir = os.path.join(tmp_dir, 'mirror')
+  source_dir = os.path.join(tmp_dir, 'source')
+  working_dir = os.path.join(tmp_dir, 'working')
+
+  while True:
+    try:
+      cros_source = GitMirror(git_mirror_dir, source_repo)
+      CheckOutSources(cros_source, source_repo, source_dir, branch)
+
+      # Let's be conservative and remove the version_manifests directory.
+      RemoveDirs(working_dir)
+      CloneGitRepo(working_dir, manifest_repo)
+
+      version_file = os.path.join(source_dir, version_file)
+      logging.debug('Using VERSION _FILE = %s', version_file)
+      version_info = VersionInfo(version_file=version_file, incr_type=incr_type)
+      build_specs = BuildSpecs(working_dir, ver_manifests, board,
+                               version_info.DirPrefix(),
+                               version_info.BuildPrefix(),
+                               version_info.incr_type)
+      current_build = version_info.VersionString()
+      logging.debug('Current build in %s: %s', version_file, current_build)
+
+      build_specs_manager = BuildSpecsManager(
+        working_dir, ver_manifests, board, version_info.DirPrefix(),
+        version_info.BuildPrefix())
+
+      next_build = build_specs.FindNextBuild(latest)
+      if next_build:
+        logging.debug('Using an existing build spec: %s', next_build)
+        SetupExistingBuildSpec(build_specs_manager, next_build)
+        return next_build
+
+      # If the build spec doesn't exist for the current version in chromeos_
+      # version.sh. we should just create the build_spec for that version,
+      # instead of incrementing chromeos_version.sh
+
+      increment_version = build_specs.ExistsBuildSpec(current_build)
+      return GenerateNewBuildSpec(source_dir, branch, build_specs.latest,
+                                  build_specs.specs_info.root_dir,
+                                  build_specs_manager, cros_source,
+                                  version_info, increment_version)
+
+    except (cros_lib.RunCommandError, GitCommandException), e:
+      if retries < 1:
+        err_msg = 'Failed to generate buildspec. error: %s' % e
+        logging.error(err_msg)
+        raise GenerateBuildSpecException(err_msg)
+
+      logging.info('Failed to generate a buildspec for consumption: %s',
+                   e.message)
+      logging.info('But will try  %d times', retries)
+      CleanUP(source_dir, working_dir)
+      retries = retries - 1
+
+def UpdateStatus(tmp_dir, manifest_repo, board,
+                 build_version, success, retries=0):
+  """Updates the status of the build
+    Args:
+      tmp_dir: Temporary working directory, best shared with GenerateWorkload
+      manifest_repo: git URL to repo with manifests/status values
+      board: name of the board
+      build_version: value returned by GenerateWorkload for this build
+      success: True for success, False for failure
+      retries: Number of retries for updating the status
+    Raises:
+      GenerateBuildSpecExtension in case of failure to generate a buildspec
+  """
+
+  working_dir = os.path.join(tmp_dir, 'working')
+  ver_manifests=os.path.basename(manifest_repo)
+  ver_manifests_dir = os.path.join(working_dir, ver_manifests)
+
+  if success:
+    status = 'pass'
+  else:
+    status = 'fail'
+
+  while True:
+    try:
+      if not os.path.exists(ver_manifests_dir):
+        CloneGitRepo(ver_manifests, git_server, working_dir)
+      cros_lib.RunCommand(['git', 'checkout', 'master'], cwd=ver_manifests_dir)
+      logging.debug('Updating the status info for %s to %s', board,
+                    status)
+      SetStatus(build_version, status, working_dir, ver_manifests, board)
+      logging.debug('Updated the status info for %s to %s', board,
+                    status)
+      break
+    except (GitCommandException, cros_lib.RunCommandError), e:
+      if retries <= 0:
+        logging.error('Failed to update the status for %s to %s', board,
+                      status)
+        err_msg = 'with the following error: %s' % e.message
+        logging.error(err_msg)
+        raise StatusUpdateException(err_msg)
+
+      logging.info('Failed to update the status for %s to %s', board,
+                   status)
+      logging.info('But will try  %d times', retries)
+      RemoveDirs(ver_manifests_dir)
+      retries = retries - 1