tools/mb/mb.py

   1 #!/usr/bin/env python
   2 # Copyright 2015 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """MB - the Meta-Build wrapper around GYP and GN
   7
   8 MB is a wrapper script for GYP and GN that can be used to generate build files
   9 for sets of canned configurations and analyze them.
  10 """
  11
  12 from __future__ import print_function
  13
  14 import argparse
  15 import ast
  16 import errno
  17 import json
  18 import os
  19 import pipes
  20 import pprint
  21 import shlex
  22 import shutil
  23 import sys
  24 import subprocess
  25 import tempfile
  26
  27 def main(args):
  28   mbw = MetaBuildWrapper()
  29   mbw.ParseArgs(args)
  30   return mbw.args.func()
  31
  32
  33 class MetaBuildWrapper(object):
  34   def __init__(self):
  35     p = os.path
  36     d = os.path.dirname
  37     self.chromium_src_dir = p.normpath(d(d(d(p.abspath(__file__)))))
  38     self.default_config = p.join(self.chromium_src_dir, 'tools', 'mb',
  39                                  'mb_config.pyl')
  40     self.executable = sys.executable
  41     self.platform = sys.platform
  42     self.sep = os.sep
  43     self.args = argparse.Namespace()
  44     self.configs = {}
  45     self.masters = {}
  46     self.mixins = {}
  47     self.private_configs = []
  48     self.common_dev_configs = []
  49     self.unsupported_configs = []
  50
  51   def ParseArgs(self, argv):
  52     def AddCommonOptions(subp):
  53       subp.add_argument('-b', '--builder',
  54                         help='builder name to look up config from')
  55       subp.add_argument('-m', '--master',
  56                         help='master name to look up config from')
  57       subp.add_argument('-c', '--config',
  58                         help='configuration to analyze')
  59       subp.add_argument('-f', '--config-file', metavar='PATH',
  60                         default=self.default_config,
  61                         help='path to config file '
  62                             '(default is //tools/mb/mb_config.pyl)')
  63       subp.add_argument('-g', '--goma-dir', default=self.ExpandUser('~/goma'),
  64                         help='path to goma directory (default is %(default)s).')
  65       subp.add_argument('-n', '--dryrun', action='store_true',
  66                         help='Do a dry run (i.e., do nothing, just print '
  67                              'the commands that will run)')
  68       subp.add_argument('-v', '--verbose', action='store_true',
  69                         help='verbose logging')
  70
  71     parser = argparse.ArgumentParser(prog='mb')
  72     subps = parser.add_subparsers()
  73
  74     subp = subps.add_parser('analyze',
  75                             help='analyze whether changes to a set of files '
  76                                  'will cause a set of binaries to be rebuilt.')
  77     AddCommonOptions(subp)
  78     subp.add_argument('--swarming-targets-file',
  79                       help='save runtime dependencies for targets listed '
  80                            'in file.')
  81     subp.add_argument('path', nargs=1,
  82                       help='path build was generated into.')
  83     subp.add_argument('input_path', nargs=1,
  84                       help='path to a file containing the input arguments '
  85                            'as a JSON object.')
  86     subp.add_argument('output_path', nargs=1,
  87                       help='path to a file containing the output arguments '
  88                            'as a JSON object.')
  89     subp.set_defaults(func=self.CmdAnalyze)
  90
  91     subp = subps.add_parser('gen',
  92                             help='generate a new set of build files')
  93     AddCommonOptions(subp)
  94     subp.add_argument('--swarming-targets-file',
  95                       help='save runtime dependencies for targets listed '
  96                            'in file.')
  97     subp.add_argument('path', nargs=1,
  98                       help='path to generate build into')
  99     subp.set_defaults(func=self.CmdGen)
 100
 101     subp = subps.add_parser('lookup',
 102                             help='look up the command for a given config or '
 103                                  'builder')
 104     AddCommonOptions(subp)
 105     subp.set_defaults(func=self.CmdLookup)
 106
 107     subp = subps.add_parser('validate',
 108                             help='validate the config file')
 109     subp.add_argument('-f', '--config-file', metavar='PATH',
 110                       default=self.default_config,
 111                       help='path to config file '
 112                           '(default is //tools/mb/mb_config.pyl)')
 113     subp.set_defaults(func=self.CmdValidate)
 114
 115     subp = subps.add_parser('help',
 116                             help='Get help on a subcommand.')
 117     subp.add_argument(nargs='?', action='store', dest='subcommand',
 118                       help='The command to get help for.')
 119     subp.set_defaults(func=self.CmdHelp)
 120
 121     self.args = parser.parse_args(argv)
 122
 123   def CmdAnalyze(self):
 124     vals = self.GetConfig()
 125     if vals['type'] == 'gn':
 126       return self.RunGNAnalyze(vals)
 127     elif vals['type'] == 'gyp':
 128       return self.RunGYPAnalyze(vals)
 129     else:
 130       raise MBErr('Unknown meta-build type "%s"' % vals['type'])
 131
 132   def CmdGen(self):
 133     vals = self.GetConfig()
 134
 135     self.ClobberIfNeeded(vals)
 136
 137     if vals['type'] == 'gn':
 138       return self.RunGNGen(vals)
 139     if vals['type'] == 'gyp':
 140       return self.RunGYPGen(vals)
 141
 142     raise MBErr('Unknown meta-build type "%s"' % vals['type'])
 143
 144   def CmdLookup(self):
 145     vals = self.GetConfig()
 146     if vals['type'] == 'gn':
 147       cmd = self.GNCmd('gen', '<path>', vals['gn_args'])
 148     elif vals['type'] == 'gyp':
 149       if vals['gyp_crosscompile']:
 150         self.Print('GYP_CROSSCOMPILE=1')
 151       cmd = self.GYPCmd('<path>', vals['gyp_defines'])
 152     else:
 153       raise MBErr('Unknown meta-build type "%s"' % vals['type'])
 154
 155     self.PrintCmd(cmd)
 156     return 0
 157
 158   def CmdHelp(self):
 159     if self.args.subcommand:
 160       self.ParseArgs([self.args.subcommand, '--help'])
 161     else:
 162       self.ParseArgs(['--help'])
 163
 164   def CmdValidate(self):
 165     errs = []
 166
 167     # Read the file to make sure it parses.
 168     self.ReadConfigFile()
 169
 170     # Figure out the whole list of configs and ensure that no config is
 171     # listed in more than one category.
 172     all_configs = {}
 173     for config in self.common_dev_configs:
 174       all_configs[config] = 'common_dev_configs'
 175     for config in self.private_configs:
 176       if config in all_configs:
 177         errs.append('config "%s" listed in "private_configs" also '
 178                     'listed in "%s"' % (config, all_configs['config']))
 179       else:
 180         all_configs[config] = 'private_configs'
 181     for config in self.unsupported_configs:
 182       if config in all_configs:
 183         errs.append('config "%s" listed in "unsupported_configs" also '
 184                     'listed in "%s"' % (config, all_configs['config']))
 185       else:
 186         all_configs[config] = 'unsupported_configs'
 187
 188     for master in self.masters:
 189       for builder in self.masters[master]:
 190         config = self.masters[master][builder]
 191         if config in all_configs and all_configs[config] not in self.masters:
 192           errs.append('Config "%s" used by a bot is also listed in "%s".' %
 193                       (config, all_configs[config]))
 194         else:
 195           all_configs[config] = master
 196
 197     # Check that every referenced config actually exists.
 198     for config, loc in all_configs.items():
 199       if not config in self.configs:
 200         errs.append('Unknown config "%s" referenced from "%s".' %
 201                     (config, loc))
 202
 203     # Check that every actual config is actually referenced.
 204     for config in self.configs:
 205       if not config in all_configs:
 206         errs.append('Unused config "%s".' % config)
 207
 208     # Figure out the whole list of mixins, and check that every mixin
 209     # listed by a config or another mixin actually exists.
 210     referenced_mixins = set()
 211     for config, mixins in self.configs.items():
 212       for mixin in mixins:
 213         if not mixin in self.mixins:
 214           errs.append('Unknown mixin "%s" referenced by config "%s".' %
 215                       (mixin, config))
 216         referenced_mixins.add(mixin)
 217
 218     for mixin in self.mixins:
 219       for sub_mixin in self.mixins[mixin].get('mixins', []):
 220         if not sub_mixin in self.mixins:
 221           errs.append('Unknown mixin "%s" referenced by mixin "%s".' %
 222                       (sub_mixin, mixin))
 223         referenced_mixins.add(sub_mixin)
 224
 225     # Check that every mixin defined is actually referenced somewhere.
 226     for mixin in self.mixins:
 227       if not mixin in referenced_mixins:
 228         errs.append('Unreferenced mixin "%s".' % mixin)
 229
 230     if errs:
 231       raise MBErr(('mb config file %s has problems:' % self.args.config_file) +
 232                     '\n  ' + '\n  '.join(errs))
 233
 234     self.Print('mb config file %s looks ok.' % self.args.config_file)
 235     return 0
 236
 237   def GetConfig(self):
 238     self.ReadConfigFile()
 239     config = self.ConfigFromArgs()
 240     if not config in self.configs:
 241       raise MBErr('Config "%s" not found in %s' %
 242                   (config, self.args.config_file))
 243
 244     return self.FlattenConfig(config)
 245
 246   def ReadConfigFile(self):
 247     if not self.Exists(self.args.config_file):
 248       raise MBErr('config file not found at %s' % self.args.config_file)
 249
 250     try:
 251       contents = ast.literal_eval(self.ReadFile(self.args.config_file))
 252     except SyntaxError as e:
 253       raise MBErr('Failed to parse config file "%s": %s' %
 254                  (self.args.config_file, e))
 255
 256     self.common_dev_configs = contents['common_dev_configs']
 257     self.configs = contents['configs']
 258     self.masters = contents['masters']
 259     self.mixins = contents['mixins']
 260     self.private_configs = contents['private_configs']
 261     self.unsupported_configs = contents['unsupported_configs']
 262
 263   def ConfigFromArgs(self):
 264     if self.args.config:
 265       if self.args.master or self.args.builder:
 266         raise MBErr('Can not specific both -c/--config and -m/--master or '
 267                     '-b/--builder')
 268
 269       return self.args.config
 270
 271     if not self.args.master or not self.args.builder:
 272       raise MBErr('Must specify either -c/--config or '
 273                   '(-m/--master and -b/--builder)')
 274
 275     if not self.args.master in self.masters:
 276       raise MBErr('Master name "%s" not found in "%s"' %
 277                   (self.args.master, self.args.config_file))
 278
 279     if not self.args.builder in self.masters[self.args.master]:
 280       raise MBErr('Builder name "%s"  not found under masters[%s] in "%s"' %
 281                   (self.args.builder, self.args.master, self.args.config_file))
 282
 283     return self.masters[self.args.master][self.args.builder]
 284
 285   def FlattenConfig(self, config):
 286     mixins = self.configs[config]
 287     vals = {
 288       'type': None,
 289       'gn_args': [],
 290       'gyp_defines': '',
 291       'gyp_crosscompile': False,
 292     }
 293
 294     visited = []
 295     self.FlattenMixins(mixins, vals, visited)
 296     return vals
 297
 298   def FlattenMixins(self, mixins, vals, visited):
 299     for m in mixins:
 300       if m not in self.mixins:
 301         raise MBErr('Unknown mixin "%s"' % m)
 302
 303       # TODO: check for cycles in mixins.
 304
 305       visited.append(m)
 306
 307       mixin_vals = self.mixins[m]
 308       if 'type' in mixin_vals:
 309         vals['type'] = mixin_vals['type']
 310       if 'gn_args' in mixin_vals:
 311         if vals['gn_args']:
 312           vals['gn_args'] += ' ' + mixin_vals['gn_args']
 313         else:
 314           vals['gn_args'] = mixin_vals['gn_args']
 315       if 'gyp_crosscompile' in mixin_vals:
 316         vals['gyp_crosscompile'] = mixin_vals['gyp_crosscompile']
 317       if 'gyp_defines' in mixin_vals:
 318         if vals['gyp_defines']:
 319           vals['gyp_defines'] += ' ' + mixin_vals['gyp_defines']
 320         else:
 321           vals['gyp_defines'] = mixin_vals['gyp_defines']
 322       if 'mixins' in mixin_vals:
 323         self.FlattenMixins(mixin_vals['mixins'], vals, visited)
 324     return vals
 325
 326   def ClobberIfNeeded(self, vals):
 327     path = self.args.path[0]
 328     build_dir = self.ToAbsPath(path)
 329     mb_type_path = self.PathJoin(build_dir, 'mb_type')
 330     needs_clobber = False
 331     new_mb_type = vals['type']
 332     if self.Exists(build_dir):
 333       if self.Exists(mb_type_path):
 334         old_mb_type = self.ReadFile(mb_type_path)
 335         if old_mb_type != new_mb_type:
 336           self.Print("Build type mismatch: was %s, will be %s, clobbering %s" %
 337                      (old_mb_type, new_mb_type, path))
 338           needs_clobber = True
 339       else:
 340         # There is no 'mb_type' file in the build directory, so this probably
 341         # means that the prior build(s) were not done through mb, and we
 342         # have no idea if this was a GYP build or a GN build. Clobber it
 343         # to be safe.
 344         self.Print("%s/mb_type missing, clobbering to be safe" % path)
 345         needs_clobber = True
 346
 347     if needs_clobber:
 348       self.RemoveDirectory(build_dir)
 349
 350     self.MaybeMakeDirectory(build_dir)
 351     self.WriteFile(mb_type_path, new_mb_type)
 352
 353   def RunGNGen(self, vals):
 354     path = self.args.path[0]
 355
 356     cmd = self.GNCmd('gen', path, vals['gn_args'])
 357
 358     swarming_targets = []
 359     if self.args.swarming_targets_file:
 360       # We need GN to generate the list of runtime dependencies for
 361       # the compile targets listed (one per line) in the file so
 362       # we can run them via swarming. We use ninja_to_gn.pyl to convert
 363       # the compile targets to the matching GN labels.
 364       contents = self.ReadFile(self.args.swarming_targets_file)
 365       swarming_targets = contents.splitlines()
 366       gn_isolate_map = ast.literal_eval(self.ReadFile(self.PathJoin(
 367           self.chromium_src_dir, 'testing', 'buildbot', 'gn_isolate_map.pyl')))
 368       gn_labels = []
 369       for target in swarming_targets:
 370         if not target in gn_isolate_map:
 371           raise MBErr('test target "%s"  not found in %s' %
 372                       (target, '//testing/buildbot/gn_isolate_map.pyl'))
 373         gn_labels.append(gn_isolate_map[target]['label'])
 374
 375       gn_runtime_deps_path = self.ToAbsPath(path, 'runtime_deps')
 376
 377       # Since GN hasn't run yet, the build directory may not even exist.
 378       self.MaybeMakeDirectory(self.ToAbsPath(path))
 379
 380       self.WriteFile(gn_runtime_deps_path, '\n'.join(gn_labels) + '\n')
 381       cmd.append('--runtime-deps-list-file=%s' % gn_runtime_deps_path)
 382
 383     ret, _, _ = self.Run(cmd)
 384     if ret:
 385         # If `gn gen` failed, we should exit early rather than trying to
 386         # generate isolates. Run() will have already logged any error output.
 387         self.Print('GN gen failed: %d' % ret)
 388         return ret
 389
 390     for target in swarming_targets:
 391       if gn_isolate_map[target]['type'] == 'gpu_browser_test':
 392         runtime_deps_target = 'browser_tests'
 393       elif gn_isolate_map[target]['type'] == 'script':
 394         # For script targets, the build target is usually a group,
 395         # for which gn generates the runtime_deps next to the stamp file
 396         # for the label, which lives under the obj/ directory.
 397         label = gn_isolate_map[target]['label']
 398         runtime_deps_target = 'obj/%s.stamp' % label.replace(':', '/')
 399       else:
 400         runtime_deps_target = target
 401       if self.platform == 'win32':
 402         deps_path = self.ToAbsPath(path,
 403                                    runtime_deps_target + '.exe.runtime_deps')
 404       else:
 405         deps_path = self.ToAbsPath(path,
 406                                    runtime_deps_target + '.runtime_deps')
 407       if not self.Exists(deps_path):
 408           raise MBErr('did not generate %s' % deps_path)
 409
 410       command, extra_files = self.GetIsolateCommand(target, vals,
 411                                                     gn_isolate_map)
 412
 413       runtime_deps = self.ReadFile(deps_path).splitlines()
 414
 415       isolate_path = self.ToAbsPath(path, target + '.isolate')
 416       self.WriteFile(isolate_path,
 417         pprint.pformat({
 418           'variables': {
 419             'command': command,
 420             'files': sorted(runtime_deps + extra_files),
 421           }
 422         }) + '\n')
 423
 424       self.WriteJSON(
 425         {
 426           'args': [
 427             '--isolated',
 428             self.ToSrcRelPath('%s%s%s.isolated' % (path, self.sep, target)),
 429             '--isolate',
 430             self.ToSrcRelPath('%s%s%s.isolate' % (path, self.sep, target)),
 431           ],
 432           'dir': self.chromium_src_dir,
 433           'version': 1,
 434         },
 435         isolate_path + 'd.gen.json',
 436       )
 437
 438     return ret
 439
 440   def GNCmd(self, subcommand, path, gn_args=''):
 441     if self.platform == 'linux2':
 442       subdir = 'linux64'
 443     elif self.platform == 'darwin':
 444       subdir = 'mac'
 445     else:
 446       subdir = 'win'
 447     gn_path = self.PathJoin(self.chromium_src_dir, 'buildtools', subdir, 'gn')
 448
 449     cmd = [gn_path, subcommand, path]
 450     gn_args = gn_args.replace("$(goma_dir)", self.args.goma_dir)
 451     if gn_args:
 452       cmd.append('--args=%s' % gn_args)
 453     return cmd
 454
 455   def RunGYPGen(self, vals):
 456     path = self.args.path[0]
 457
 458     output_dir = self.ParseGYPConfigPath(path)
 459     cmd = self.GYPCmd(output_dir, vals['gyp_defines'])
 460     env = None
 461     if vals['gyp_crosscompile']:
 462       if self.args.verbose:
 463         self.Print('Setting GYP_CROSSCOMPILE=1 in the environment')
 464       env = os.environ.copy()
 465       env['GYP_CROSSCOMPILE'] = '1'
 466     ret, _, _ = self.Run(cmd, env=env)
 467     return ret
 468
 469   def RunGYPAnalyze(self, vals):
 470     output_dir = self.ParseGYPConfigPath(self.args.path[0])
 471     if self.args.verbose:
 472       inp = self.ReadInputJSON(['files', 'targets'])
 473       self.Print()
 474       self.Print('analyze input:')
 475       self.PrintJSON(inp)
 476       self.Print()
 477
 478     cmd = self.GYPCmd(output_dir, vals['gyp_defines'])
 479     cmd.extend(['-f', 'analyzer',
 480                 '-G', 'config_path=%s' % self.args.input_path[0],
 481                 '-G', 'analyzer_output_path=%s' % self.args.output_path[0]])
 482     ret, _, _ = self.Run(cmd)
 483     if not ret and self.args.verbose:
 484       outp = json.loads(self.ReadFile(self.args.output_path[0]))
 485       self.Print()
 486       self.Print('analyze output:')
 487       self.PrintJSON(outp)
 488       self.Print()
 489
 490     return ret
 491
 492   def GetIsolateCommand(self, target, vals, gn_isolate_map):
 493     # This needs to mirror the settings in //build/config/ui.gni:
 494     # use_x11 = is_linux && !use_ozone.
 495     # TODO(dpranke): Figure out how to keep this in sync better.
 496     use_x11 = (self.platform == 'linux2' and
 497                not 'target_os="android"' in vals['gn_args'] and
 498                not 'use_ozone=true' in vals['gn_args'])
 499
 500     asan = 'is_asan=true' in vals['gn_args']
 501     msan = 'is_msan=true' in vals['gn_args']
 502     tsan = 'is_tsan=true' in vals['gn_args']
 503
 504     executable_suffix = '.exe' if self.platform == 'win32' else ''
 505
 506     test_type = gn_isolate_map[target]['type']
 507     cmdline = []
 508     extra_files = []
 509
 510     if use_x11 and test_type == 'windowed_test_launcher':
 511       extra_files = [
 512           'xdisplaycheck',
 513           '../../testing/test_env.py',
 514           '../../testing/xvfb.py',
 515       ]
 516       cmdline = [
 517         '../../testing/xvfb.py',
 518         '.',
 519         './' + str(target),
 520         '--brave-new-test-launcher',
 521         '--test-launcher-bot-mode',
 522         '--asan=%d' % asan,
 523         '--msan=%d' % msan,
 524         '--tsan=%d' % tsan,
 525       ]
 526     elif test_type in ('windowed_test_launcher', 'console_test_launcher'):
 527       extra_files = [
 528           '../../testing/test_env.py'
 529       ]
 530       cmdline = [
 531           '../../testing/test_env.py',
 532           './' + str(target) + executable_suffix,
 533           '--brave-new-test-launcher',
 534           '--test-launcher-bot-mode',
 535           '--asan=%d' % asan,
 536           '--msan=%d' % msan,
 537           '--tsan=%d' % tsan,
 538       ]
 539     elif test_type == 'gpu_browser_test':
 540       extra_files = [
 541           '../../testing/test_env.py'
 542       ]
 543       gtest_filter = gn_isolate_map[target]['gtest_filter']
 544       cmdline = [
 545           '../../testing/test_env.py',
 546           './browser_tests' + executable_suffix,
 547           '--test-launcher-bot-mode',
 548           '--enable-gpu',
 549           '--test-launcher-jobs=1',
 550           '--gtest_filter=%s' % gtest_filter,
 551       ]
 552     elif test_type == 'script':
 553       extra_files = [
 554           '../../testing/test_env.py'
 555       ]
 556       cmdline = [
 557           '../../testing/test_env.py',
 558       ] + ['../../' + self.ToSrcRelPath(gn_isolate_map[target]['script'])]
 559     elif test_type in ('raw'):
 560       extra_files = []
 561       cmdline = [
 562           './' + str(target) + executable_suffix,
 563       ] + gn_isolate_map[target].get('args')
 564
 565     else:
 566       self.WriteFailureAndRaise('No command line for %s found (test type %s).'
 567                                 % (target, test_type), output_path=None)
 568
 569     return cmdline, extra_files
 570
 571   def ToAbsPath(self, build_path, *comps):
 572     return self.PathJoin(self.chromium_src_dir,
 573                          self.ToSrcRelPath(build_path),
 574                          *comps)
 575
 576   def ToSrcRelPath(self, path):
 577     """Returns a relative path from the top of the repo."""
 578     # TODO: Support normal paths in addition to source-absolute paths.
 579     assert(path.startswith('//'))
 580     return path[2:].replace('/', self.sep)
 581
 582   def ParseGYPConfigPath(self, path):
 583     rpath = self.ToSrcRelPath(path)
 584     output_dir, _, _ = rpath.rpartition(self.sep)
 585     return output_dir
 586
 587   def GYPCmd(self, output_dir, gyp_defines):
 588     gyp_defines = gyp_defines.replace("$(goma_dir)", self.args.goma_dir)
 589     cmd = [
 590         self.executable,
 591         self.PathJoin('build', 'gyp_chromium'),
 592         '-G',
 593         'output_dir=' + output_dir,
 594     ]
 595     for d in shlex.split(gyp_defines):
 596       cmd += ['-D', d]
 597     return cmd
 598
 599   def RunGNAnalyze(self, vals):
 600     # analyze runs before 'gn gen' now, so we need to run gn gen
 601     # in order to ensure that we have a build directory.
 602     ret = self.RunGNGen(vals)
 603     if ret:
 604       return ret
 605
 606     inp = self.ReadInputJSON(['files', 'targets'])
 607     if self.args.verbose:
 608       self.Print()
 609       self.Print('analyze input:')
 610       self.PrintJSON(inp)
 611       self.Print()
 612
 613     output_path = self.args.output_path[0]
 614
 615     # Bail out early if a GN file was modified, since 'gn refs' won't know
 616     # what to do about it.
 617     if any(f.endswith('.gn') or f.endswith('.gni') for f in inp['files']):
 618       self.WriteJSON({'status': 'Found dependency (all)'}, output_path)
 619       return 0
 620
 621     # Bail out early if 'all' was asked for, since 'gn refs' won't recognize it.
 622     if 'all' in inp['targets']:
 623       self.WriteJSON({'status': 'Found dependency (all)'}, output_path)
 624       return 0
 625
 626     # This shouldn't normally happen, but could due to unusual race conditions,
 627     # like a try job that gets scheduled before a patch lands but runs after
 628     # the patch has landed.
 629     if not inp['files']:
 630       self.Print('Warning: No files modified in patch, bailing out early.')
 631       self.WriteJSON({'targets': [],
 632                       'build_targets': [],
 633                       'status': 'No dependency'}, output_path)
 634       return 0
 635
 636     ret = 0
 637     response_file = self.TempFile()
 638     response_file.write('\n'.join(inp['files']) + '\n')
 639     response_file.close()
 640
 641     matching_targets = []
 642     try:
 643       cmd = self.GNCmd('refs', self.args.path[0]) + [
 644           '@%s' % response_file.name, '--all', '--as=output']
 645       ret, out, _ = self.Run(cmd, force_verbose=False)
 646       if ret and not 'The input matches no targets' in out:
 647         self.WriteFailureAndRaise('gn refs returned %d: %s' % (ret, out),
 648                                   output_path)
 649       build_dir = self.ToSrcRelPath(self.args.path[0]) + self.sep
 650       for output in out.splitlines():
 651         build_output = output.replace(build_dir, '')
 652         if build_output in inp['targets']:
 653           matching_targets.append(build_output)
 654
 655       cmd = self.GNCmd('refs', self.args.path[0]) + [
 656           '@%s' % response_file.name, '--all']
 657       ret, out, _ = self.Run(cmd, force_verbose=False)
 658       if ret and not 'The input matches no targets' in out:
 659         self.WriteFailureAndRaise('gn refs returned %d: %s' % (ret, out),
 660                                   output_path)
 661       for label in out.splitlines():
 662         build_target = label[2:]
 663         # We want to accept 'chrome/android:chrome_public_apk' and
 664         # just 'chrome_public_apk'. This may result in too many targets
 665         # getting built, but we can adjust that later if need be.
 666         for input_target in inp['targets']:
 667           if (input_target == build_target or
 668               build_target.endswith(':' + input_target)):
 669             matching_targets.append(input_target)
 670     finally:
 671       self.RemoveFile(response_file.name)
 672
 673     if matching_targets:
 674       # TODO: it could be that a target X might depend on a target Y
 675       # and both would be listed in the input, but we would only need
 676       # to specify target X as a build_target (whereas both X and Y are
 677       # targets). I'm not sure if that optimization is generally worth it.
 678       self.WriteJSON({'targets': sorted(set(matching_targets)),
 679                       'build_targets': sorted(set(matching_targets)),
 680                       'status': 'Found dependency'}, output_path)
 681     else:
 682       self.WriteJSON({'targets': [],
 683                       'build_targets': [],
 684                       'status': 'No dependency'}, output_path)
 685
 686     if self.args.verbose:
 687       outp = json.loads(self.ReadFile(output_path))
 688       self.Print()
 689       self.Print('analyze output:')
 690       self.PrintJSON(outp)
 691       self.Print()
 692
 693     return 0
 694
 695   def ReadInputJSON(self, required_keys):
 696     path = self.args.input_path[0]
 697     output_path = self.args.output_path[0]
 698     if not self.Exists(path):
 699       self.WriteFailureAndRaise('"%s" does not exist' % path, output_path)
 700
 701     try:
 702       inp = json.loads(self.ReadFile(path))
 703     except Exception as e:
 704       self.WriteFailureAndRaise('Failed to read JSON input from "%s": %s' %
 705                                 (path, e), output_path)
 706
 707     for k in required_keys:
 708       if not k in inp:
 709         self.WriteFailureAndRaise('input file is missing a "%s" key' % k,
 710                                   output_path)
 711
 712     return inp
 713
 714   def WriteFailureAndRaise(self, msg, output_path):
 715     if output_path:
 716       self.WriteJSON({'error': msg}, output_path, force_verbose=True)
 717     raise MBErr(msg)
 718
 719   def WriteJSON(self, obj, path, force_verbose=False):
 720     try:
 721       self.WriteFile(path, json.dumps(obj, indent=2, sort_keys=True) + '\n',
 722                      force_verbose=force_verbose)
 723     except Exception as e:
 724       raise MBErr('Error %s writing to the output path "%s"' %
 725                  (e, path))
 726
 727   def PrintCmd(self, cmd):
 728     if cmd[0] == self.executable:
 729       cmd = ['python'] + cmd[1:]
 730     self.Print(*[pipes.quote(c) for c in cmd])
 731
 732   def PrintJSON(self, obj):
 733     self.Print(json.dumps(obj, indent=2, sort_keys=True))
 734
 735   def Print(self, *args, **kwargs):
 736     # This function largely exists so it can be overridden for testing.
 737     print(*args, **kwargs)
 738
 739   def Run(self, cmd, env=None, force_verbose=True):
 740     # This function largely exists so it can be overridden for testing.
 741     if self.args.dryrun or self.args.verbose or force_verbose:
 742       self.PrintCmd(cmd)
 743     if self.args.dryrun:
 744       return 0, '', ''
 745
 746     ret, out, err = self.Call(cmd, env=env)
 747     if self.args.verbose or force_verbose:
 748       if out:
 749         self.Print(out, end='')
 750       if err:
 751         self.Print(err, end='', file=sys.stderr)
 752     return ret, out, err
 753
 754   def Call(self, cmd, env=None):
 755     p = subprocess.Popen(cmd, shell=False, cwd=self.chromium_src_dir,
 756                          stdout=subprocess.PIPE, stderr=subprocess.PIPE,
 757                          env=env)
 758     out, err = p.communicate()
 759     return p.returncode, out, err
 760
 761   def ExpandUser(self, path):
 762     # This function largely exists so it can be overridden for testing.
 763     return os.path.expanduser(path)
 764
 765   def Exists(self, path):
 766     # This function largely exists so it can be overridden for testing.
 767     return os.path.exists(path)
 768
 769   def MaybeMakeDirectory(self, path):
 770     try:
 771       os.makedirs(path)
 772     except OSError, e:
 773       if e.errno != errno.EEXIST:
 774         raise
 775
 776   def PathJoin(self, *comps):
 777     # This function largely exists so it can be overriden for testing.
 778     return os.path.join(*comps)
 779
 780   def ReadFile(self, path):
 781     # This function largely exists so it can be overriden for testing.
 782     with open(path) as fp:
 783       return fp.read()
 784
 785   def RemoveFile(self, path):
 786     # This function largely exists so it can be overriden for testing.
 787     os.remove(path)
 788
 789   def RemoveDirectory(self, abs_path):
 790     if self.platform == 'win32':
 791       # In other places in chromium, we often have to retry this command
 792       # because we're worried about other processes still holding on to
 793       # file handles, but when MB is invoked, it will be early enough in the
 794       # build that their should be no other processes to interfere. We
 795       # can change this if need be.
 796       self.Run(['cmd.exe', '/c', 'rmdir', '/q', '/s', abs_path])
 797     else:
 798       shutil.rmtree(abs_path, ignore_errors=True)
 799
 800   def TempFile(self, mode='w'):
 801     # This function largely exists so it can be overriden for testing.
 802     return tempfile.NamedTemporaryFile(mode=mode, delete=False)
 803
 804   def WriteFile(self, path, contents, force_verbose=False):
 805     # This function largely exists so it can be overriden for testing.
 806     if self.args.dryrun or self.args.verbose or force_verbose:
 807       self.Print('\nWriting """\\\n%s""" to %s.\n' % (contents, path))
 808     with open(path, 'w') as fp:
 809       return fp.write(contents)
 810
 811
 812 class MBErr(Exception):
 813   pass
 814
 815
 816 if __name__ == '__main__':
 817   try:
 818     sys.exit(main(sys.argv[1:]))
 819   except MBErr as e:
 820     print(e)
 821     sys.exit(1)
 822   except KeyboardInterrupt:
 823     print("interrupted, exiting", stream=sys.stderr)
 824     sys.exit(130)