scripts/spdxcheck.py

   1 #!/usr/bin/env python3
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Copyright Thomas Gleixner <tglx@linutronix.de>
   4
   5 from argparse import ArgumentParser
   6 from ply import lex, yacc
   7 import locale
   8 import traceback
   9 import fnmatch
  10 import sys
  11 import git
  12 import re
  13 import os
  14
  15 class ParserException(Exception):
  16     def __init__(self, tok, txt):
  17         self.tok = tok
  18         self.txt = txt
  19
  20 class SPDXException(Exception):
  21     def __init__(self, el, txt):
  22         self.el = el
  23         self.txt = txt
  24
  25 class SPDXdata(object):
  26     def __init__(self):
  27         self.license_files = 0
  28         self.exception_files = 0
  29         self.licenses = [ ]
  30         self.exceptions = { }
  31
  32 class dirinfo(object):
  33     def __init__(self):
  34         self.missing = 0
  35         self.total = 0
  36         self.files = []
  37
  38     def update(self, fname, basedir, miss):
  39         self.total += 1
  40         self.missing += miss
  41         if miss:
  42             fname = './' + fname
  43             bdir = os.path.dirname(fname)
  44             if bdir == basedir.rstrip('/'):
  45                 self.files.append(fname)
  46
  47 # Read the spdx data from the LICENSES directory
  48 def read_spdxdata(repo):
  49
  50     # The subdirectories of LICENSES in the kernel source
  51     # Note: exceptions needs to be parsed as last directory.
  52     license_dirs = [ "preferred", "dual", "deprecated", "exceptions" ]
  53     lictree = repo.head.commit.tree['LICENSES']
  54
  55     spdx = SPDXdata()
  56
  57     for d in license_dirs:
  58         for el in lictree[d].traverse():
  59             if not os.path.isfile(el.path):
  60                 continue
  61
  62             exception = None
  63             for l in open(el.path, encoding="utf-8").readlines():
  64                 if l.startswith('Valid-License-Identifier:'):
  65                     lid = l.split(':')[1].strip().upper()
  66                     if lid in spdx.licenses:
  67                         raise SPDXException(el, 'Duplicate License Identifier: %s' %lid)
  68                     else:
  69                         spdx.licenses.append(lid)
  70
  71                 elif l.startswith('SPDX-Exception-Identifier:'):
  72                     exception = l.split(':')[1].strip().upper()
  73                     spdx.exceptions[exception] = []
  74
  75                 elif l.startswith('SPDX-Licenses:'):
  76                     for lic in l.split(':')[1].upper().strip().replace(' ', '').replace('\t', '').split(','):
  77                         if not lic in spdx.licenses:
  78                             raise SPDXException(None, 'Exception %s missing license %s' %(exception, lic))
  79                         spdx.exceptions[exception].append(lic)
  80
  81                 elif l.startswith("License-Text:"):
  82                     if exception:
  83                         if not len(spdx.exceptions[exception]):
  84                             raise SPDXException(el, 'Exception %s is missing SPDX-Licenses' %exception)
  85                         spdx.exception_files += 1
  86                     else:
  87                         spdx.license_files += 1
  88                     break
  89     return spdx
  90
  91 class id_parser(object):
  92
  93     reserved = [ 'AND', 'OR', 'WITH' ]
  94     tokens = [ 'LPAR', 'RPAR', 'ID', 'EXC' ] + reserved
  95
  96     precedence = ( ('nonassoc', 'AND', 'OR'), )
  97
  98     t_ignore = ' \t'
  99
 100     def __init__(self, spdx):
 101         self.spdx = spdx
 102         self.lasttok = None
 103         self.lastid = None
 104         self.lexer = lex.lex(module = self, reflags = re.UNICODE)
 105         # Initialize the parser. No debug file and no parser rules stored on disk
 106         # The rules are small enough to be generated on the fly
 107         self.parser = yacc.yacc(module = self, write_tables = False, debug = False)
 108         self.lines_checked = 0
 109         self.checked = 0
 110         self.excluded = 0
 111         self.spdx_valid = 0
 112         self.spdx_errors = 0
 113         self.spdx_dirs = {}
 114         self.dirdepth = -1
 115         self.basedir = '.'
 116         self.curline = 0
 117         self.deepest = 0
 118
 119     def set_dirinfo(self, basedir, dirdepth):
 120         if dirdepth >= 0:
 121             self.basedir = basedir
 122             bdir = basedir.lstrip('./').rstrip('/')
 123             if bdir != '':
 124                 parts = bdir.split('/')
 125             else:
 126                 parts = []
 127             self.dirdepth = dirdepth + len(parts)
 128
 129     # Validate License and Exception IDs
 130     def validate(self, tok):
 131         id = tok.value.upper()
 132         if tok.type == 'ID':
 133             if not id in self.spdx.licenses:
 134                 raise ParserException(tok, 'Invalid License ID')
 135             self.lastid = id
 136         elif tok.type == 'EXC':
 137             if id not in self.spdx.exceptions:
 138                 raise ParserException(tok, 'Invalid Exception ID')
 139             if self.lastid not in self.spdx.exceptions[id]:
 140                 raise ParserException(tok, 'Exception not valid for license %s' %self.lastid)
 141             self.lastid = None
 142         elif tok.type != 'WITH':
 143             self.lastid = None
 144
 145     # Lexer functions
 146     def t_RPAR(self, tok):
 147         r'\)'
 148         self.lasttok = tok.type
 149         return tok
 150
 151     def t_LPAR(self, tok):
 152         r'\('
 153         self.lasttok = tok.type
 154         return tok
 155
 156     def t_ID(self, tok):
 157         r'[A-Za-z.0-9\-+]+'
 158
 159         if self.lasttok == 'EXC':
 160             print(tok)
 161             raise ParserException(tok, 'Missing parentheses')
 162
 163         tok.value = tok.value.strip()
 164         val = tok.value.upper()
 165
 166         if val in self.reserved:
 167             tok.type = val
 168         elif self.lasttok == 'WITH':
 169             tok.type = 'EXC'
 170
 171         self.lasttok = tok.type
 172         self.validate(tok)
 173         return tok
 174
 175     def t_error(self, tok):
 176         raise ParserException(tok, 'Invalid token')
 177
 178     def p_expr(self, p):
 179         '''expr : ID
 180                 | ID WITH EXC
 181                 | expr AND expr
 182                 | expr OR expr
 183                 | LPAR expr RPAR'''
 184         pass
 185
 186     def p_error(self, p):
 187         if not p:
 188             raise ParserException(None, 'Unfinished license expression')
 189         else:
 190             raise ParserException(p, 'Syntax error')
 191
 192     def parse(self, expr):
 193         self.lasttok = None
 194         self.lastid = None
 195         self.parser.parse(expr, lexer = self.lexer)
 196
 197     def parse_lines(self, fd, maxlines, fname):
 198         self.checked += 1
 199         self.curline = 0
 200         fail = 1
 201         try:
 202             for line in fd:
 203                 line = line.decode(locale.getpreferredencoding(False), errors='ignore')
 204                 self.curline += 1
 205                 if self.curline > maxlines:
 206                     break
 207                 self.lines_checked += 1
 208                 if line.find("SPDX-License-Identifier:") < 0:
 209                     continue
 210                 expr = line.split(':')[1].strip()
 211                 # Remove trailing comment closure
 212                 if line.strip().endswith('*/'):
 213                     expr = expr.rstrip('*/').strip()
 214                 # Remove trailing xml comment closure
 215                 if line.strip().endswith('-->'):
 216                     expr = expr.rstrip('-->').strip()
 217                 # Special case for SH magic boot code files
 218                 if line.startswith('LIST \"'):
 219                     expr = expr.rstrip('\"').strip()
 220                 self.parse(expr)
 221                 self.spdx_valid += 1
 222                 #
 223                 # Should we check for more SPDX ids in the same file and
 224                 # complain if there are any?
 225                 #
 226                 fail = 0
 227                 break
 228
 229         except ParserException as pe:
 230             if pe.tok:
 231                 col = line.find(expr) + pe.tok.lexpos
 232                 tok = pe.tok.value
 233                 sys.stdout.write('%s: %d:%d %s: %s\n' %(fname, self.curline, col, pe.txt, tok))
 234             else:
 235                 sys.stdout.write('%s: %d:0 %s\n' %(fname, self.curline, pe.txt))
 236             self.spdx_errors += 1
 237
 238         if fname == '-':
 239             return
 240
 241         base = os.path.dirname(fname)
 242         if self.dirdepth > 0:
 243             parts = base.split('/')
 244             i = 0
 245             base = '.'
 246             while i < self.dirdepth and i < len(parts) and len(parts[i]):
 247                 base += '/' + parts[i]
 248                 i += 1
 249         elif self.dirdepth == 0:
 250             base = self.basedir
 251         else:
 252             base = './' + base.rstrip('/')
 253         base += '/'
 254
 255         di = self.spdx_dirs.get(base, dirinfo())
 256         di.update(fname, base, fail)
 257         self.spdx_dirs[base] = di
 258
 259 class pattern(object):
 260     def __init__(self, line):
 261         self.pattern = line
 262         self.match = self.match_file
 263         if line == '.*':
 264             self.match = self.match_dot
 265         elif line.endswith('/'):
 266             self.pattern = line[:-1]
 267             self.match = self.match_dir
 268         elif line.startswith('/'):
 269             self.pattern = line[1:]
 270             self.match = self.match_fn
 271
 272     def match_dot(self, fpath):
 273         return os.path.basename(fpath).startswith('.')
 274
 275     def match_file(self, fpath):
 276         return os.path.basename(fpath) == self.pattern
 277
 278     def match_fn(self, fpath):
 279         return fnmatch.fnmatchcase(fpath, self.pattern)
 280
 281     def match_dir(self, fpath):
 282         if self.match_fn(os.path.dirname(fpath)):
 283             return True
 284         return fpath.startswith(self.pattern)
 285
 286 def exclude_file(fpath):
 287     for rule in exclude_rules:
 288         if rule.match(fpath):
 289             return True
 290     return False
 291
 292 def scan_git_tree(tree, basedir, dirdepth):
 293     parser.set_dirinfo(basedir, dirdepth)
 294     for el in tree.traverse():
 295         if not os.path.isfile(el.path):
 296             continue
 297         if exclude_file(el.path):
 298             parser.excluded += 1
 299             continue
 300         with open(el.path, 'rb') as fd:
 301             parser.parse_lines(fd, args.maxlines, el.path)
 302
 303 def scan_git_subtree(tree, path, dirdepth):
 304     for p in path.strip('/').split('/'):
 305         tree = tree[p]
 306     scan_git_tree(tree, path.strip('/'), dirdepth)
 307
 308 def read_exclude_file(fname):
 309     rules = []
 310     if not fname:
 311         return rules
 312     with open(fname) as fd:
 313         for line in fd:
 314             line = line.strip()
 315             if line.startswith('#'):
 316                 continue
 317             if not len(line):
 318                 continue
 319             rules.append(pattern(line))
 320     return rules
 321
 322 if __name__ == '__main__':
 323
 324     ap = ArgumentParser(description='SPDX expression checker')
 325     ap.add_argument('path', nargs='*', help='Check path or file. If not given full git tree scan. For stdin use "-"')
 326     ap.add_argument('-d', '--dirs', action='store_true',
 327                     help='Show [sub]directory statistics.')
 328     ap.add_argument('-D', '--depth', type=int, default=-1,
 329                     help='Directory depth for -d statistics. Default: unlimited')
 330     ap.add_argument('-e', '--exclude',
 331                     help='File containing file patterns to exclude. Default: scripts/spdxexclude')
 332     ap.add_argument('-f', '--files', action='store_true',
 333                     help='Show files without SPDX.')
 334     ap.add_argument('-m', '--maxlines', type=int, default=15,
 335                     help='Maximum number of lines to scan in a file. Default 15')
 336     ap.add_argument('-v', '--verbose', action='store_true', help='Verbose statistics output')
 337     args = ap.parse_args()
 338
 339     # Sanity check path arguments
 340     if '-' in args.path and len(args.path) > 1:
 341         sys.stderr.write('stdin input "-" must be the only path argument\n')
 342         sys.exit(1)
 343
 344     try:
 345         # Use git to get the valid license expressions
 346         repo = git.Repo(os.getcwd())
 347         assert not repo.bare
 348
 349         # Initialize SPDX data
 350         spdx = read_spdxdata(repo)
 351
 352         # Initialize the parser
 353         parser = id_parser(spdx)
 354
 355     except SPDXException as se:
 356         if se.el:
 357             sys.stderr.write('%s: %s\n' %(se.el.path, se.txt))
 358         else:
 359             sys.stderr.write('%s\n' %se.txt)
 360         sys.exit(1)
 361
 362     except Exception as ex:
 363         sys.stderr.write('FAIL: %s\n' %ex)
 364         sys.stderr.write('%s\n' %traceback.format_exc())
 365         sys.exit(1)
 366
 367     try:
 368         fname = args.exclude
 369         if not fname:
 370             fname = os.path.join(os.path.dirname(__file__), 'spdxexclude')
 371         exclude_rules = read_exclude_file(fname)
 372     except Exception as ex:
 373         sys.stderr.write('FAIL: Reading exclude file %s: %s\n' %(fname, ex))
 374         sys.exit(1)
 375
 376     try:
 377         if len(args.path) and args.path[0] == '-':
 378             stdin = os.fdopen(sys.stdin.fileno(), 'rb')
 379             parser.parse_lines(stdin, args.maxlines, '-')
 380         else:
 381             if args.path:
 382                 for p in args.path:
 383                     if os.path.isfile(p):
 384                         parser.parse_lines(open(p, 'rb'), args.maxlines, p)
 385                     elif os.path.isdir(p):
 386                         scan_git_subtree(repo.head.reference.commit.tree, p,
 387                                          args.depth)
 388                     else:
 389                         sys.stderr.write('path %s does not exist\n' %p)
 390                         sys.exit(1)
 391             else:
 392                 # Full git tree scan
 393                 scan_git_tree(repo.head.commit.tree, '.', args.depth)
 394
 395             ndirs = len(parser.spdx_dirs)
 396             dirsok = 0
 397             if ndirs:
 398                 for di in parser.spdx_dirs.values():
 399                     if not di.missing:
 400                         dirsok += 1
 401
 402             if args.verbose:
 403                 sys.stderr.write('\n')
 404                 sys.stderr.write('License files:     %12d\n' %spdx.license_files)
 405                 sys.stderr.write('Exception files:   %12d\n' %spdx.exception_files)
 406                 sys.stderr.write('License IDs        %12d\n' %len(spdx.licenses))
 407                 sys.stderr.write('Exception IDs      %12d\n' %len(spdx.exceptions))
 408                 sys.stderr.write('\n')
 409                 sys.stderr.write('Files excluded:    %12d\n' %parser.excluded)
 410                 sys.stderr.write('Files checked:     %12d\n' %parser.checked)
 411                 sys.stderr.write('Lines checked:     %12d\n' %parser.lines_checked)
 412                 if parser.checked:
 413                     pc = int(100 * parser.spdx_valid / parser.checked)
 414                     sys.stderr.write('Files with SPDX:   %12d %3d%%\n' %(parser.spdx_valid, pc))
 415                 sys.stderr.write('Files with errors: %12d\n' %parser.spdx_errors)
 416                 if ndirs:
 417                     sys.stderr.write('\n')
 418                     sys.stderr.write('Directories accounted: %8d\n' %ndirs)
 419                     pc = int(100 * dirsok / ndirs)
 420                     sys.stderr.write('Directories complete:  %8d %3d%%\n' %(dirsok, pc))
 421
 422             if ndirs and ndirs != dirsok and args.dirs:
 423                 if args.verbose:
 424                     sys.stderr.write('\n')
 425                 sys.stderr.write('Incomplete directories: SPDX in Files\n')
 426                 for f in sorted(parser.spdx_dirs.keys()):
 427                     di = parser.spdx_dirs[f]
 428                     if di.missing:
 429                         valid = di.total - di.missing
 430                         pc = int(100 * valid / di.total)
 431                         sys.stderr.write('    %-80s: %5d of %5d  %3d%%\n' %(f, valid, di.total, pc))
 432
 433             if ndirs and ndirs != dirsok and args.files:
 434                 if args.verbose or args.dirs:
 435                     sys.stderr.write('\n')
 436                 sys.stderr.write('Files without SPDX:\n')
 437                 for f in sorted(parser.spdx_dirs.keys()):
 438                     di = parser.spdx_dirs[f]
 439                     for f in sorted(di.files):
 440                         sys.stderr.write('    %s\n' %f)
 441
 442             sys.exit(0)
 443
 444     except Exception as ex:
 445         sys.stderr.write('FAIL: %s\n' %ex)
 446         sys.stderr.write('%s\n' %traceback.format_exc())
 447         sys.exit(1)