tools/licenses.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2012 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 """Utility for checking and processing licensing information in third_party
   7 directories.
   8
   9 Usage: licenses.py <command>
  10
  11 Commands:
  12   scan     scan third_party directories, verifying that we have licensing info
  13   credits  generate about:credits on stdout
  14
  15 (You can also import this as a module.)
  16 """
  17
  18 import cgi
  19 import os
  20 import sys
  21
  22 # Paths from the root of the tree to directories to skip.
  23 PRUNE_PATHS = set([
  24     # Same module occurs in crypto/third_party/nss and net/third_party/nss, so
  25     # skip this one.
  26     os.path.join('third_party','nss'),
  27
  28     # Placeholder directory only, not third-party code.
  29     os.path.join('third_party','adobe'),
  30
  31     # Apache 2.0 license. See crbug.com/140478
  32     os.path.join('third_party','bidichecker'),
  33
  34     # Build files only, not third-party code.
  35     os.path.join('third_party','widevine'),
  36
  37     # Only binaries, used during development.
  38     os.path.join('third_party','valgrind'),
  39
  40     # Used for development and test, not in the shipping product.
  41     os.path.join('build','secondary'),
  42     os.path.join('third_party','bison'),
  43     os.path.join('third_party','blanketjs'),
  44     os.path.join('third_party','cygwin'),
  45     os.path.join('third_party','gles2_conform'),
  46     os.path.join('third_party','gnu_binutils'),
  47     os.path.join('third_party','gold'),
  48     os.path.join('third_party','gperf'),
  49     os.path.join('third_party','lighttpd'),
  50     os.path.join('third_party','llvm'),
  51     os.path.join('third_party','llvm-build'),
  52     os.path.join('third_party','mingw-w64'),
  53     os.path.join('third_party','nacl_sdk_binaries'),
  54     os.path.join('third_party','pefile'),
  55     os.path.join('third_party','perl'),
  56     os.path.join('third_party','psyco_win32'),
  57     os.path.join('third_party','pylib'),
  58     os.path.join('third_party','pywebsocket'),
  59     os.path.join('third_party','qunit'),
  60     os.path.join('third_party','sinonjs'),
  61     os.path.join('third_party','syzygy'),
  62     os.path.join('tools', 'profile_chrome', 'third_party'),
  63
  64     # Chromium code in third_party.
  65     os.path.join('third_party','fuzzymatch'),
  66     os.path.join('tools', 'swarming_client'),
  67
  68     # Stuff pulled in from chrome-internal for official builds/tools.
  69     os.path.join('third_party', 'clear_cache'),
  70     os.path.join('third_party', 'gnu'),
  71     os.path.join('third_party', 'googlemac'),
  72     os.path.join('third_party', 'pcre'),
  73     os.path.join('third_party', 'psutils'),
  74     os.path.join('third_party', 'sawbuck'),
  75     # See crbug.com/350472
  76     os.path.join('chrome', 'browser', 'resources', 'chromeos', 'quickoffice'),
  77     # Chrome for Android proprietary code.
  78     os.path.join('clank'),
  79
  80     # Redistribution does not require attribution in documentation.
  81     os.path.join('third_party','directxsdk'),
  82     os.path.join('third_party','platformsdk_win2008_6_1'),
  83     os.path.join('third_party','platformsdk_win7'),
  84
  85     # For testing only, presents on some bots.
  86     os.path.join('isolate_deps_dir'),
  87 ])
  88
  89 # Directories we don't scan through.
  90 VCS_METADATA_DIRS = ('.svn', '.git')
  91 PRUNE_DIRS = (VCS_METADATA_DIRS +
  92               ('out', 'Debug', 'Release',  # build files
  93                'layout_tests'))            # lots of subdirs
  94
  95 ADDITIONAL_PATHS = (
  96     os.path.join('breakpad'),
  97     os.path.join('chrome', 'common', 'extensions', 'docs', 'examples'),
  98     os.path.join('chrome', 'test', 'chromeos', 'autotest'),
  99     os.path.join('chrome', 'test', 'data'),
 100     os.path.join('native_client'),
 101     os.path.join('net', 'tools', 'spdyshark'),
 102     os.path.join('sdch', 'open-vcdiff'),
 103     os.path.join('testing', 'gmock'),
 104     os.path.join('testing', 'gtest'),
 105     os.path.join('tools', 'grit'),
 106     os.path.join('tools', 'gyp'),
 107     os.path.join('tools', 'page_cycler', 'acid3'),
 108     os.path.join('url', 'third_party', 'mozilla'),
 109     os.path.join('v8'),
 110     # Fake directories to include the strongtalk and fdlibm licenses.
 111     os.path.join('v8', 'strongtalk'),
 112     os.path.join('v8', 'fdlibm'),
 113 )
 114
 115
 116 # Directories where we check out directly from upstream, and therefore
 117 # can't provide a README.chromium.  Please prefer a README.chromium
 118 # wherever possible.
 119 SPECIAL_CASES = {
 120     os.path.join('native_client'): {
 121         "Name": "native client",
 122         "URL": "http://code.google.com/p/nativeclient",
 123         "License": "BSD",
 124     },
 125     os.path.join('sdch', 'open-vcdiff'): {
 126         "Name": "open-vcdiff",
 127         "URL": "http://code.google.com/p/open-vcdiff",
 128         "License": "Apache 2.0, MIT, GPL v2 and custom licenses",
 129         "License Android Compatible": "yes",
 130     },
 131     os.path.join('testing', 'gmock'): {
 132         "Name": "gmock",
 133         "URL": "http://code.google.com/p/googlemock",
 134         "License": "BSD",
 135         "License File": "NOT_SHIPPED",
 136     },
 137     os.path.join('testing', 'gtest'): {
 138         "Name": "gtest",
 139         "URL": "http://code.google.com/p/googletest",
 140         "License": "BSD",
 141         "License File": "NOT_SHIPPED",
 142     },
 143     os.path.join('third_party', 'angle'): {
 144         "Name": "Almost Native Graphics Layer Engine",
 145         "URL": "http://code.google.com/p/angleproject/",
 146         "License": "BSD",
 147     },
 148     os.path.join('third_party', 'cros_system_api'): {
 149         "Name": "Chromium OS system API",
 150         "URL": "http://www.chromium.org/chromium-os",
 151         "License": "BSD",
 152         # Absolute path here is resolved as relative to the source root.
 153         "License File": "/LICENSE.chromium_os",
 154     },
 155     os.path.join('third_party', 'lss'): {
 156         "Name": "linux-syscall-support",
 157         "URL": "http://code.google.com/p/linux-syscall-support/",
 158         "License": "BSD",
 159         "License File": "/LICENSE",
 160     },
 161     os.path.join('third_party', 'ots'): {
 162         "Name": "OTS (OpenType Sanitizer)",
 163         "URL": "http://code.google.com/p/ots/",
 164         "License": "BSD",
 165     },
 166     os.path.join('third_party', 'pdfium'): {
 167         "Name": "PDFium",
 168         "URL": "http://code.google.com/p/pdfium/",
 169         "License": "BSD",
 170     },
 171     os.path.join('third_party', 'pdfsqueeze'): {
 172         "Name": "pdfsqueeze",
 173         "URL": "http://code.google.com/p/pdfsqueeze/",
 174         "License": "Apache 2.0",
 175         "License File": "COPYING",
 176     },
 177     os.path.join('third_party', 'ppapi'): {
 178         "Name": "ppapi",
 179         "URL": "http://code.google.com/p/ppapi/",
 180     },
 181     os.path.join('third_party', 'scons-2.0.1'): {
 182         "Name": "scons-2.0.1",
 183         "URL": "http://www.scons.org",
 184         "License": "MIT",
 185         "License File": "NOT_SHIPPED",
 186     },
 187     os.path.join('third_party', 'trace-viewer'): {
 188         "Name": "trace-viewer",
 189         "URL": "http://code.google.com/p/trace-viewer",
 190         "License": "BSD",
 191         "License File": "NOT_SHIPPED",
 192     },
 193     os.path.join('third_party', 'v8-i18n'): {
 194         "Name": "Internationalization Library for v8",
 195         "URL": "http://code.google.com/p/v8-i18n/",
 196         "License": "Apache 2.0",
 197     },
 198     os.path.join('third_party', 'WebKit'): {
 199         "Name": "WebKit",
 200         "URL": "http://webkit.org/",
 201         "License": "BSD and GPL v2",
 202         # Absolute path here is resolved as relative to the source root.
 203         "License File": "/third_party/WebKit/LICENSE_FOR_ABOUT_CREDITS",
 204     },
 205     os.path.join('third_party', 'webpagereplay'): {
 206         "Name": "webpagereplay",
 207         "URL": "http://code.google.com/p/web-page-replay",
 208         "License": "Apache 2.0",
 209         "License File": "NOT_SHIPPED",
 210     },
 211     os.path.join('tools', 'grit'): {
 212         "Name": "grit",
 213         "URL": "http://code.google.com/p/grit-i18n",
 214         "License": "BSD",
 215         "License File": "NOT_SHIPPED",
 216     },
 217     os.path.join('tools', 'gyp'): {
 218         "Name": "gyp",
 219         "URL": "http://code.google.com/p/gyp",
 220         "License": "BSD",
 221         "License File": "NOT_SHIPPED",
 222     },
 223     os.path.join('v8'): {
 224         "Name": "V8 JavaScript Engine",
 225         "URL": "http://code.google.com/p/v8",
 226         "License": "BSD",
 227     },
 228     os.path.join('v8', 'strongtalk'): {
 229         "Name": "Strongtalk",
 230         "URL": "http://www.strongtalk.org/",
 231         "License": "BSD",
 232         # Absolute path here is resolved as relative to the source root.
 233         "License File": "/v8/LICENSE.strongtalk",
 234     },
 235     os.path.join('v8', 'fdlibm'): {
 236         "Name": "fdlibm",
 237         "URL": "http://www.netlib.org/fdlibm/",
 238         "License": "Freely Distributable",
 239         # Absolute path here is resolved as relative to the source root.
 240         "License File" : "/v8/src/third_party/fdlibm/LICENSE",
 241         "License Android Compatible" : "yes",
 242     },
 243     os.path.join('third_party', 'khronos_glcts'): {
 244         # These sources are not shipped, are not public, and it isn't
 245         # clear why they're tripping the license check.
 246         "Name": "khronos_glcts",
 247         "URL": "http://no-public-url",
 248         "License": "Khronos",
 249         "License File": "NOT_SHIPPED",
 250     },
 251     os.path.join('tools', 'telemetry', 'third_party', 'gsutil'): {
 252         "Name": "gsutil",
 253         "URL": "https://cloud.google.com/storage/docs/gsutil",
 254         "License": "Apache 2.0",
 255         "License File": "NOT_SHIPPED",
 256     },
 257 }
 258
 259 # Special value for 'License File' field used to indicate that the license file
 260 # should not be used in about:credits.
 261 NOT_SHIPPED = "NOT_SHIPPED"
 262
 263
 264 class LicenseError(Exception):
 265     """We raise this exception when a directory's licensing info isn't
 266     fully filled out."""
 267     pass
 268
 269 def AbsolutePath(path, filename, root):
 270     """Convert a path in README.chromium to be absolute based on the source
 271     root."""
 272     if filename.startswith('/'):
 273         # Absolute-looking paths are relative to the source root
 274         # (which is the directory we're run from).
 275         absolute_path = os.path.join(root, filename[1:])
 276     else:
 277         absolute_path = os.path.join(root, path, filename)
 278     if os.path.exists(absolute_path):
 279         return absolute_path
 280     return None
 281
 282 def ParseDir(path, root, require_license_file=True, optional_keys=None):
 283     """Examine a third_party/foo component and extract its metadata."""
 284
 285     # Parse metadata fields out of README.chromium.
 286     # We examine "LICENSE" for the license file by default.
 287     metadata = {
 288         "License File": "LICENSE",  # Relative path to license text.
 289         "Name": None,               # Short name (for header on about:credits).
 290         "URL": None,                # Project home page.
 291         "License": None,            # Software license.
 292         }
 293
 294     if optional_keys is None:
 295         optional_keys = []
 296
 297     if path in SPECIAL_CASES:
 298         metadata.update(SPECIAL_CASES[path])
 299     else:
 300         # Try to find README.chromium.
 301         readme_path = os.path.join(root, path, 'README.chromium')
 302         if not os.path.exists(readme_path):
 303             raise LicenseError("missing README.chromium or licenses.py "
 304                                "SPECIAL_CASES entry")
 305
 306         for line in open(readme_path):
 307             line = line.strip()
 308             if not line:
 309                 break
 310             for key in metadata.keys() + optional_keys:
 311                 field = key + ": "
 312                 if line.startswith(field):
 313                     metadata[key] = line[len(field):]
 314
 315     # Check that all expected metadata is present.
 316     for key, value in metadata.iteritems():
 317         if not value:
 318             raise LicenseError("couldn't find '" + key + "' line "
 319                                "in README.chromium or licences.py "
 320                                "SPECIAL_CASES")
 321
 322     # Special-case modules that aren't in the shipping product, so don't need
 323     # their license in about:credits.
 324     if metadata["License File"] != NOT_SHIPPED:
 325         # Check that the license file exists.
 326         for filename in (metadata["License File"], "COPYING"):
 327             license_path = AbsolutePath(path, filename, root)
 328             if license_path is not None:
 329                 break
 330
 331         if require_license_file and not license_path:
 332             raise LicenseError("License file not found. "
 333                                "Either add a file named LICENSE, "
 334                                "import upstream's COPYING if available, "
 335                                "or add a 'License File:' line to "
 336                                "README.chromium with the appropriate path.")
 337         metadata["License File"] = license_path
 338
 339     return metadata
 340
 341
 342 def ContainsFiles(path, root):
 343     """Determines whether any files exist in a directory or in any of its
 344     subdirectories."""
 345     for _, dirs, files in os.walk(os.path.join(root, path)):
 346         if files:
 347             return True
 348         for vcs_metadata in VCS_METADATA_DIRS:
 349             if vcs_metadata in dirs:
 350                 dirs.remove(vcs_metadata)
 351     return False
 352
 353
 354 def FilterDirsWithFiles(dirs_list, root):
 355     # If a directory contains no files, assume it's a DEPS directory for a
 356     # project not used by our current configuration and skip it.
 357     return [x for x in dirs_list if ContainsFiles(x, root)]
 358
 359
 360 def FindThirdPartyDirs(prune_paths, root):
 361     """Find all third_party directories underneath the source root."""
 362     third_party_dirs = set()
 363     for path, dirs, files in os.walk(root):
 364         path = path[len(root)+1:]  # Pretty up the path.
 365
 366         if path in prune_paths:
 367             dirs[:] = []
 368             continue
 369
 370         # Prune out directories we want to skip.
 371         # (Note that we loop over PRUNE_DIRS so we're not iterating over a
 372         # list that we're simultaneously mutating.)
 373         for skip in PRUNE_DIRS:
 374             if skip in dirs:
 375                 dirs.remove(skip)
 376
 377         if os.path.basename(path) == 'third_party':
 378             # Add all subdirectories that are not marked for skipping.
 379             for dir in dirs:
 380                 dirpath = os.path.join(path, dir)
 381                 if dirpath not in prune_paths:
 382                     third_party_dirs.add(dirpath)
 383
 384             # Don't recurse into any subdirs from here.
 385             dirs[:] = []
 386             continue
 387
 388         # Don't recurse into paths in ADDITIONAL_PATHS, like we do with regular
 389         # third_party/foo paths.
 390         if path in ADDITIONAL_PATHS:
 391             dirs[:] = []
 392
 393     for dir in ADDITIONAL_PATHS:
 394         if dir not in prune_paths:
 395             third_party_dirs.add(dir)
 396
 397     return third_party_dirs
 398
 399
 400 def FindThirdPartyDirsWithFiles(root):
 401     third_party_dirs = FindThirdPartyDirs(PRUNE_PATHS, root)
 402     return FilterDirsWithFiles(third_party_dirs, root)
 403
 404
 405 def ScanThirdPartyDirs(root=None):
 406     """Scan a list of directories and report on any problems we find."""
 407     if root is None:
 408       root = os.getcwd()
 409     third_party_dirs = FindThirdPartyDirsWithFiles(root)
 410
 411     errors = []
 412     for path in sorted(third_party_dirs):
 413         try:
 414             metadata = ParseDir(path, root)
 415         except LicenseError, e:
 416             errors.append((path, e.args[0]))
 417             continue
 418
 419     for path, error in sorted(errors):
 420         print path + ": " + error
 421
 422     return len(errors) == 0
 423
 424
 425 def GenerateCredits():
 426     """Generate about:credits."""
 427
 428     if len(sys.argv) not in (2, 3):
 429       print 'usage: licenses.py credits [output_file]'
 430       return False
 431
 432     def EvaluateTemplate(template, env, escape=True):
 433         """Expand a template with variables like {{foo}} using a
 434         dictionary of expansions."""
 435         for key, val in env.items():
 436             if escape:
 437                 val = cgi.escape(val)
 438             template = template.replace('{{%s}}' % key, val)
 439         return template
 440
 441     root = os.path.join(os.path.dirname(__file__), '..')
 442     third_party_dirs = FindThirdPartyDirs(PRUNE_PATHS, root)
 443
 444     entry_template = open(os.path.join(root, 'chrome', 'browser', 'resources',
 445                                        'about_credits_entry.tmpl'), 'rb').read()
 446     entries = []
 447     for path in sorted(third_party_dirs):
 448         try:
 449             metadata = ParseDir(path, root)
 450         except LicenseError:
 451             # TODO(phajdan.jr): Convert to fatal error (http://crbug.com/39240).
 452             continue
 453         if metadata['License File'] == NOT_SHIPPED:
 454             continue
 455         env = {
 456             'name': metadata['Name'],
 457             'url': metadata['URL'],
 458             'license': open(metadata['License File'], 'rb').read(),
 459         }
 460         entries.append(EvaluateTemplate(entry_template, env))
 461
 462     file_template = open(os.path.join(root, 'chrome', 'browser', 'resources',
 463                                       'about_credits.tmpl'), 'rb').read()
 464     template_contents = "<!-- Generated by licenses.py; do not edit. -->"
 465     template_contents += EvaluateTemplate(file_template,
 466                                           {'entries': '\n'.join(entries)},
 467                                           escape=False)
 468
 469     if len(sys.argv) == 3:
 470       with open(sys.argv[2], 'w') as output_file:
 471         output_file.write(template_contents)
 472     elif len(sys.argv) == 2:
 473       print template_contents
 474
 475     return True
 476
 477
 478 def main():
 479     command = 'help'
 480     if len(sys.argv) > 1:
 481         command = sys.argv[1]
 482
 483     if command == 'scan':
 484         if not ScanThirdPartyDirs():
 485             return 1
 486     elif command == 'credits':
 487         if not GenerateCredits():
 488             return 1
 489     else:
 490         print __doc__
 491         return 1
 492
 493
 494 if __name__ == '__main__':
 495   sys.exit(main())