native_client_sdk/src/build_tools/build_version.py

   1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 """Small utility library of python functions used during SDK building.
   6 """
   7
   8 import os
   9 import re
  10 import sys
  11
  12 # pylint: disable=E0602
  13
  14 # Reuse last change utility code.
  15 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
  16 SRC_DIR = os.path.dirname(os.path.dirname(os.path.dirname(SCRIPT_DIR)))
  17 sys.path.append(os.path.join(SRC_DIR, 'build/util'))
  18 import lastchange
  19
  20
  21 # Location of chrome's version file.
  22 VERSION_PATH = os.path.join(SRC_DIR, 'chrome', 'VERSION')
  23
  24
  25 def ChromeVersion():
  26   '''Extract chrome version from src/chrome/VERSION + svn.
  27
  28   Returns:
  29     Chrome version string or trunk + svn rev.
  30   '''
  31   info = FetchGitCommitPosition()
  32   if info.url == 'git':
  33     _, ref, revision = ParseCommitPosition(info.revision)
  34     if ref == 'refs/heads/master':
  35       return 'trunk.%s' % revision
  36   return ChromeVersionNoTrunk()
  37
  38
  39 def ChromeVersionNoTrunk():
  40   '''Extract the chrome version from src/chrome/VERSION.
  41   Ignore whether this is a trunk build.
  42
  43   Returns:
  44     Chrome version string.
  45   '''
  46   exec(open(VERSION_PATH).read())
  47   return '%s.%s.%s.%s' % (MAJOR, MINOR, BUILD, PATCH)
  48
  49
  50 def ChromeMajorVersion():
  51   '''Extract chrome major version from src/chrome/VERSION.
  52
  53   Returns:
  54     Chrome major version.
  55   '''
  56   exec(open(VERSION_PATH, 'r').read())
  57   return str(MAJOR)
  58
  59
  60 def ChromeRevision():
  61   '''Extract chrome revision from svn.
  62
  63      Now that the Chrome source-of-truth is git, this will return the
  64      Cr-Commit-Position instead. Fortunately, this value is equal to the SVN
  65      revision if one exists.
  66
  67   Returns:
  68     The Chrome revision as a string. e.g. "12345"
  69   '''
  70   version = FetchGitCommitPosition()
  71   return ParseCommitPosition(version.revision)[2]
  72
  73
  74 def ChromeCommitPosition():
  75   '''Return the full git sha and commit position.
  76
  77   Returns:
  78     A value like:
  79     0178d4831bd36b5fb9ff477f03dc43b11626a6dc-refs/heads/master@{#292238}
  80   '''
  81   return FetchGitCommitPosition().revision
  82
  83
  84 def NaClRevision():
  85   '''Extract NaCl revision from svn.
  86
  87   Returns:
  88     The NaCl revision as a string. e.g. "12345"
  89   '''
  90   nacl_dir = os.path.join(SRC_DIR, 'native_client')
  91   return lastchange.FetchVersionInfo(None, nacl_dir, 'native_client').revision
  92
  93
  94 def FetchGitCommitPosition(directory=None):
  95   '''Return the "commit-position" of the Chromium git repo. This should be
  96   equivalent to the SVN revision if one exists.
  97   '''
  98   SEARCH_LIMIT = 100
  99   for i in xrange(SEARCH_LIMIT):
 100     cmd = ['show', '-s', '--format=%H%n%B', 'HEAD~%d' % i]
 101     proc = lastchange.RunGitCommand(directory, cmd)
 102     if not proc:
 103       break
 104
 105     output = proc.communicate()[0]
 106     if not (proc.returncode == 0 and output):
 107       break
 108
 109     lines = output.splitlines()
 110
 111     # First line is the hash.
 112     hsh = lines[0]
 113     if not re.match(r'[0-9a-fA-F]+', hsh):
 114       break
 115
 116     for line in reversed(lines):
 117       if line.startswith('Cr-Commit-Position:'):
 118         pos = line.rsplit()[-1].strip()
 119         return lastchange.VersionInfo('git', '%s-%s' % (hsh, pos))
 120
 121   raise Exception('Unable to fetch a Git Commit Position.')
 122
 123
 124
 125 def ParseCommitPosition(commit_position):
 126   '''Parse a Chrome commit position into its components.
 127
 128   Given a commit position like:
 129     0178d4831bd36b5fb9ff477f03dc43b11626a6dc-refs/heads/master@{#292238}
 130   Returns:
 131     ("0178d4831bd36b5fb9ff477f03dc43b11626a6dc", "refs/heads/master", "292238")
 132   '''
 133   m = re.match(r'([0-9a-fA-F]+)(?:-([^@]+)@{#(\d+)})?', commit_position)
 134   if m:
 135     return m.groups()
 136   return None