scripts/release/release.py
author Mario Ferraro <fadinlight@gmail.com>
Sun, 15 Nov 2009 22:12:20 +0100
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permissions -rwxr-xr-x
GMaps related JS changed to use new google namespace. Google is going to change permanently in the future the way to load its services, so better stay safe. Also this commit shows uses of the new melange.js module. Fixes Issue 634.
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#!/usr/bin/python2.5
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#
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# Copyright 2009 the Melange authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#   http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import with_statement
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"""Google Summer of Code Melange release script.
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This script provides automation for the various tasks involved in
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releasing a new version of Melange and pushing it to various app
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engine instances.
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It does not provide a turnkey autopilot solution. Notably, each stage
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of the release process must be started by a human operator, and some
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commands will request confirmation or extra details before
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proceeding. It is not a replacement for a cautious human operator.
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Note that this script requires Python 2.5 or better (for various
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language features)
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"""
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__authors__ = [
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    # alphabetical order by last name, please
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    '"David Anderson" <dave@natulte.net>',
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    ]
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import functools
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import os
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import re
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import subprocess
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import sys
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import error
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import io
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import log
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import subversion
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import util
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# Default repository URLs for Melange and the Google release
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# repository.
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MELANGE_REPOS = 'http://soc.googlecode.com/svn'
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# Regular expression matching an apparently well formed Melange
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# release number.
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MELANGE_RELEASE_RE = re.compile(r'\d-\d-\d{8}p\d+')
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class Error(error.Error):
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  pass
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#
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# Decorators for use in ReleaseEnvironment.
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#
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def pristine_wc(f):
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  """A decorator that cleans up the release repository."""
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  @functools.wraps(f)
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  def revert_wc(self, *args, **kwargs):
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    self.wc.revert()
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    return f(self, *args, **kwargs)
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  return revert_wc
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def requires_branch(f):
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  """A decorator that checks that a release branch is active."""
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  @functools.wraps(f)
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  def check_branch(self, *args, **kwargs):
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    if self.branch is None:
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      raise error.ExpectationFailed(
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        'This operation requires an active release branch')
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    return f(self, *args, **kwargs)
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  return check_branch
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class ReleaseEnvironment(util.Paths):
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  """Encapsulates the state of a Melange release rolling environment.
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  This class contains the actual releasing logic, and makes use of
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  the previously defined utility classes to carry out user commands.
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  Attributes:
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    release_repos: The URL to the Google release repository root.
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    upstream_repos: The URL to the Melange upstream repository root.
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    wc: A Subversion object encapsulating a Google SoC working copy.
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  """
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  BRANCH_FILE = 'BRANCH'
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  def __init__(self, root, release_repos, upstream_repos):
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    """Initializer.
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    Args:
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      root: The root of the release environment.
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      release_repos: The URL to the Google release repository root.
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      upstream_repos: The URL to the Melange upstream repository root.
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    """
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    util.Paths.__init__(self, root)
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    self.wc = subversion.WorkingCopy(self.path('google-soc'))
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    self.release_repos = release_repos.strip('/')
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    self.upstream_repos = upstream_repos.strip('/')
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    if not self.wc.exists():
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      self._InitializeWC()
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    else:
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      self.wc.revert()
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      if self.exists(self.BRANCH_FILE):
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        branch = io.fileToLines(self.path(self.BRANCH_FILE))[0]
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        self._switchBranch(branch)
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      else:
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        self._switchBranch(None)
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  def _InitializeWC(self):
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    """Check out the initial release repository.
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    Will also select the latest release branch, if any, so that
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    the end state is a fully ready to function release environment.
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    """
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    log.info('Checking out the release repository')
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    # Check out a sparse view of the relevant repository paths.
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    self.wc.checkout(self.release_repos, depth='immediates')
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    self.wc.update('vendor', depth='immediates')
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    self.wc.update('branches', depth='immediates')
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    self.wc.update('tags', depth='immediates')
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    # Locate the most recent release branch, if any, and switch
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    # the release environment to it.
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    branches = self._listBranches()
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    if not branches:
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      self._switchBranch(None)
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    else:
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      self._switchBranch(branches[-1])
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  def _listBranches(self):
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    """Return a list of available Melange release branches.
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    Branches are returned in sorted order, from least recent to
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    most recent in release number ordering.
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    """
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    assert self.wc.exists('branches')
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    branches = self.wc.ls('branches')
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    # Some early release branches used a different naming scheme
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    # that doesn't sort properly with new-style release names. We
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    # filter those out here, along with empty lines.
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    branches = [b.strip('/') for b in branches
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          if MELANGE_RELEASE_RE.match(b.strip('/'))]
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    return sorted(branches)
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  def _switchBranch(self, release):
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    """Activate the branch matching the given release.
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    Once activated, this branch is the target of future release
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    operations.
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    None can be passed as the release. The result is that no
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    branch is active, and all operations that require an active
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    branch will fail until a branch is activated again. This is
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    used only at initialization, when it is detected that there
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    are no available release branches to activate.
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    Args:
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      release: The version number of a Melange release already
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        imported in the release repository, or None to activate 
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        no branch.
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    """
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    if release is None:
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      self.branch = None
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      self.branch_dir = None
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      log.info('No release branch available')
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    else:
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      self.wc.update()
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      assert self.wc.exists('branches/' + release)
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      io.linesToFile(self.path(self.BRANCH_FILE), [release])
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      self.branch = release
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      self.branch_dir = 'branches/' + release
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      self.wc.update(self.branch_dir, depth='infinity')
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      log.info('Working on branch ' + self.branch)
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  def _branchPath(self, path):
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    """Return the given path with the release branch path prepended."""
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    assert self.branch_dir is not None
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    return os.path.join(self.branch_dir, path)
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  #
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  # Release engineering commands. See further down for their
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  # integration into a commandline interface.
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  #
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  @pristine_wc
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  def update(self):
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    """Update and clean the release repository"""
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    self.wc.update()
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  @pristine_wc
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  def switchToBranch(self):
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    """Switch to another Melange release branch"""
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    branches = self._listBranches()
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    if not branches:
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      raise error.ExpectationFailed(
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        'No branches available. Please import one.')
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    choice = io.getChoice('Available release branches:',
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                          'Your choice?',
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                          branches,
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                          suggest=len(branches)-1)
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    self._switchBranch(branches[choice])
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  def _addAppYaml(self):
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    """Create a Google production app.yaml configuration.
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    The file is copied and modified from the upstream
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    app.yaml.template, configure for Google's Summer of Code App
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    Engine instance, and committed.
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    """
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    if self.wc.exists(self._branchPath('app/app.yaml')):
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      raise ObstructionError('app/app.yaml exists already')
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    yaml_path = self._branchPath('app/app.yaml')
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    self.wc.copy(yaml_path + '.template', yaml_path)
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    yaml = io.fileToLines(self.wc.path(yaml_path))
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    out = []
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    for i, line in enumerate(yaml):
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      stripped_line = line.strip()
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      if 'TODO' in stripped_line:
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        continue
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      elif stripped_line == '# application: FIXME':
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        out.append('application: socghop')
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      elif stripped_line.startswith('version:'):
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        out.append(line.lstrip() + 'g0')
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        out.append('# * initial Google fork of Melange ' + self.branch)
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      else:
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        out.append(line)
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    io.linesToFile(self.wc.path(yaml_path), out)
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    self.wc.commit('Create app.yaml with Google patch version g0 '
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             'in branch ' + self.branch)
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  def _applyGooglePatches(self):
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    """Apply Google-specific patches to a vanilla Melange release.
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    Each patch is applied and committed in turn.
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    """
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    # Edit the base template to point users to the Google fork
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    # of the Melange codebase instead of the vanilla release.
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    tmpl_file = self.wc.path(
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      self._branchPath('app/soc/templates/soc/base.html'))
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    tmpl = io.fileToLines(tmpl_file)
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    for i, line in enumerate(tmpl):
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      if 'http://code.google.com/p/soc/source/browse/tags/' in line:
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        tmpl[i] = line.replace('/p/soc/', '/p/soc-google/')
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        break
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    else:
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      raise error.ExpectationFailed(
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        'No source code link found in base.html')
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    io.linesToFile(tmpl_file, tmpl)
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    self.wc.commit(
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      'Customize the Melange release link in the sidebar menu')
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  @pristine_wc
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  def importTag(self):
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    """Import a new Melange release"""
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    release = io.getString('Enter the Melange release to import:')
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    if not release:
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      error.AbortedByUser('No release provided, import aborted')
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    branch_dir = 'branches/' + release
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    if self.wc.exists(branch_dir):
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      raise ObstructionError('Release %s already imported' % release)
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    tag_url = '%s/tags/%s' % (self.upstream_repos, release)
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    release_rev = subversion.find_tag_rev(tag_url)
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    if io.confirm('Confirm import of release %s, tagged at r%d?' %
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                  (release, release_rev)):
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      # Add an entry to the vendor externals for the Melange
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      # release.
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      externals = self.wc.propget('svn:externals', 'vendor/soc')
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      externals.append('%s -r %d %s' % (release, release_rev, tag_url))
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      self.wc.propset('svn:externals', '\n'.join(externals), 'vendor/soc')
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      self.wc.commit('Add svn:externals entry to pull in Melange '
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          'release %s at r%d.' % (release, release_rev))
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      # Export the tag into the release repository's branches
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      subversion.export(tag_url, release_rev, self.wc.path(branch_dir))
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      # Add and commit the branch add (very long operation!)
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      self.wc.add([branch_dir])
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      self.wc.commit('Branch of Melange release %s' % release, branch_dir)
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      self._switchBranch(release)
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      # Commit the production GSoC configuration and
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      # google-specific patches.
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      self._addAppYaml()
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      self._applyGooglePatches()
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      # All done!
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      log.info('Melange release %s imported and googlified' % self.branch)
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   319
  @requires_branch
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   320
  @pristine_wc
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  def cherryPickChange(self):
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    """Cherry-pick a change from the Melange trunk"""
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   323
    rev = io.getNumber('Revision number to cherry-pick:')
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   324
    bug = io.getNumber('Issue fixed by this change:')
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   325
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   326
    diff = subversion.diff(self.upstream_repos + '/trunk', rev)
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    if not diff.strip():
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   328
      raise error.ExpectationFailed(
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   329
        'Retrieved diff is empty. '
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   330
        'Did you accidentally cherry-pick a branch change?')
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    util.run(['patch', '-p0'], cwd=self.wc.path(self.branch_dir), stdin=diff)
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    self.wc.addRemove(self.branch_dir)
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   333
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   334
    yaml_path = self.wc.path(self._branchPath('app/app.yaml'))
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   335
    out = []
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   336
    updated_patchlevel = False
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   337
    for line in io.fileToLines(yaml_path):
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      if line.strip().startswith('version: '):
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        version = line.strip().split()[-1]
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        base, patch = line.rsplit('g', 1)
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   341
        new_version = '%sg%d' % (base, int(patch) + 1)
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        message = ('Cherry-picked r%d from /p/soc/ to fix issue %d' %
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   343
            (rev, bug))
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   344
        out.append('version: ' + new_version)
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   345
        out.append('# * ' + message)
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   346
        updated_patchlevel = True
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   347
      else:
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   348
        out.append(line)
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   349
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   350
    if not updated_patchlevel:
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   351
      log.error('Failed to update Google patch revision')
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   352
      log.error('Cherry-picking failed')
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   353
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   354
    io.linesToFile(yaml_path, out)
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   355
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   356
    log.info('Check the diff about to be committed with:')
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   357
    log.info('svn diff ' + self.wc.path(self.branch_dir))
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   358
    if not io.confirm('Commit this change?'):
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   359
      raise error.AbortedByUser('Cherry-pick aborted')
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   360
    self.wc.commit(message)
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   361
    log.info('Cherry-picked r%d from the Melange trunk.' % rev)
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   362
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   363
  MENU_ORDER = [
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   364
    update,
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   365
    switchToBranch,
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   366
    importTag,
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   367
    cherryPickChange,
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   368
    ]
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   369
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   370
  MENU_STRINGS = [d.__doc__ for d in MENU_ORDER]
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   371
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   372
  MENU_SUGGESTIONS = {
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   373
    None: update,
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   374
    update: cherryPickChange,
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    switchToBranch: cherryPickChange,
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    importTag: cherryPickChange,
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    cherryPickChange: None,
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    }
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  def interactiveMenu(self):
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    done = []
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    last_choice = None
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    while True:
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      # Show the user their previously completed operations and
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      # a suggested next op, to remind them where they are in
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      # the release process (useful after long operations that
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      # may have caused lunch or an extended context switch).
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      if last_choice is not None:
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        last_command = self.MENU_ORDER[last_choice]
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   390
      else:
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        last_command = None
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      suggested_next = self.MENU_ORDER.index(
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        self.MENU_SUGGESTIONS[last_command])
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      try:
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        choice = io.getChoice('Main menu:', 'Your choice?',
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                              self.MENU_STRINGS, done=done,
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                              suggest=suggested_next)
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      except (KeyboardInterrupt, error.AbortedByUser):
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        log.info('Exiting.')
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        return
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   402
      try:
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        self.MENU_ORDER[choice](self)
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      except error.Error, e:
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        log.error(str(e))
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   406
      else:
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   407
        done.append(choice)
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   408
        last_choice = choice
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def main(argv):
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   412
  if not (1 <= len(argv) <= 3):
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   413
    print ('Usage: gsoc-release.py [release repos root URL] '
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           '[upstream repos root URL]')
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    sys.exit(1)
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   416
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  release_repos, upstream_repos = GOOGLE_SOC_REPOS, MELANGE_REPOS
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   418
  if len(argv) >= 2:
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   419
    release_repos = argv[1]
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   420
  if len(argv) == 3:
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    upstream_repos = argv[2]
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   422
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   423
  log.init('release.log')
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   424
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   425
  log.info('Release repository: ' + release_repos)
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   426
  log.info('Upstream repository: ' + upstream_repos)
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   427
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   428
  r = ReleaseEnvironment(os.path.abspath('_release_'),
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   429
                         release_repos,
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   430
                         upstream_repos)
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   431
  r.interactiveMenu()
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   432
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   433
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   434
if __name__ == '__main__':
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   435
  main(sys.argv)