xref: /openbmc/linux/scripts/spdxcheck.py (revision 42bc47b3) 
1#!/usr/bin/env python
2# SPDX-License-Identifier: GPL-2.0
3# Copyright Thomas Gleixner <tglx@linutronix.de>
4
5from argparse import ArgumentParser
6from ply import lex, yacc
7import traceback
8import sys
9import git
10import re
11import os
12
13class ParserException(Exception):
14    def __init__(self, tok, txt):
15        self.tok = tok
16        self.txt = txt
17
18class SPDXException(Exception):
19    def __init__(self, el, txt):
20        self.el = el
21        self.txt = txt
22
23class SPDXdata(object):
24    def __init__(self):
25        self.license_files = 0
26        self.exception_files = 0
27        self.licenses = [ ]
28        self.exceptions = { }
29
30# Read the spdx data from the LICENSES directory
31def read_spdxdata(repo):
32
33    # The subdirectories of LICENSES in the kernel source
34    license_dirs = [ "preferred", "other", "exceptions" ]
35    lictree = repo.heads.master.commit.tree['LICENSES']
36
37    spdx = SPDXdata()
38
39    for d in license_dirs:
40        for el in lictree[d].traverse():
41            if not os.path.isfile(el.path):
42                continue
43
44            exception = None
45            for l in open(el.path).readlines():
46                if l.startswith('Valid-License-Identifier:'):
47                    lid = l.split(':')[1].strip().upper()
48                    if lid in spdx.licenses:
49                        raise SPDXException(el, 'Duplicate License Identifier: %s' %lid)
50                    else:
51                        spdx.licenses.append(lid)
52
53                elif l.startswith('SPDX-Exception-Identifier:'):
54                    exception = l.split(':')[1].strip().upper()
55                    spdx.exceptions[exception] = []
56
57                elif l.startswith('SPDX-Licenses:'):
58                    for lic in l.split(':')[1].upper().strip().replace(' ', '').replace('\t', '').split(','):
59                        if not lic in spdx.licenses:
60                            raise SPDXException(None, 'Exception %s missing license %s' %(ex, lic))
61                        spdx.exceptions[exception].append(lic)
62
63                elif l.startswith("License-Text:"):
64                    if exception:
65                        if not len(spdx.exceptions[exception]):
66                            raise SPDXException(el, 'Exception %s is missing SPDX-Licenses' %excid)
67                        spdx.exception_files += 1
68                    else:
69                        spdx.license_files += 1
70                    break
71    return spdx
72
73class id_parser(object):
74
75    reserved = [ 'AND', 'OR', 'WITH' ]
76    tokens = [ 'LPAR', 'RPAR', 'ID', 'EXC' ] + reserved
77
78    precedence = ( ('nonassoc', 'AND', 'OR'), )
79
80    t_ignore = ' \t'
81
82    def __init__(self, spdx):
83        self.spdx = spdx
84        self.lasttok = None
85        self.lastid = None
86        self.lexer = lex.lex(module = self, reflags = re.UNICODE)
87        # Initialize the parser. No debug file and no parser rules stored on disk
88        # The rules are small enough to be generated on the fly
89        self.parser = yacc.yacc(module = self, write_tables = False, debug = False)
90        self.lines_checked = 0
91        self.checked = 0
92        self.spdx_valid = 0
93        self.spdx_errors = 0
94        self.curline = 0
95        self.deepest = 0
96
97    # Validate License and Exception IDs
98    def validate(self, tok):
99        id = tok.value.upper()
100        if tok.type == 'ID':
101            if not id in self.spdx.licenses:
102                raise ParserException(tok, 'Invalid License ID')
103            self.lastid = id
104        elif tok.type == 'EXC':
105            if not self.spdx.exceptions.has_key(id):
106                raise ParserException(tok, 'Invalid Exception ID')
107            if self.lastid not in self.spdx.exceptions[id]:
108                raise ParserException(tok, 'Exception not valid for license %s' %self.lastid)
109            self.lastid = None
110        elif tok.type != 'WITH':
111            self.lastid = None
112
113    # Lexer functions
114    def t_RPAR(self, tok):
115        r'\)'
116        self.lasttok = tok.type
117        return tok
118
119    def t_LPAR(self, tok):
120        r'\('
121        self.lasttok = tok.type
122        return tok
123
124    def t_ID(self, tok):
125        r'[A-Za-z.0-9\-+]+'
126
127        if self.lasttok == 'EXC':
128            print(tok)
129            raise ParserException(tok, 'Missing parentheses')
130
131        tok.value = tok.value.strip()
132        val = tok.value.upper()
133
134        if val in self.reserved:
135            tok.type = val
136        elif self.lasttok == 'WITH':
137            tok.type = 'EXC'
138
139        self.lasttok = tok.type
140        self.validate(tok)
141        return tok
142
143    def t_error(self, tok):
144        raise ParserException(tok, 'Invalid token')
145
146    def p_expr(self, p):
147        '''expr : ID
148                | ID WITH EXC
149                | expr AND expr
150                | expr OR expr
151                | LPAR expr RPAR'''
152        pass
153
154    def p_error(self, p):
155        if not p:
156            raise ParserException(None, 'Unfinished license expression')
157        else:
158            raise ParserException(p, 'Syntax error')
159
160    def parse(self, expr):
161        self.lasttok = None
162        self.lastid = None
163        self.parser.parse(expr, lexer = self.lexer)
164
165    def parse_lines(self, fd, maxlines, fname):
166        self.checked += 1
167        self.curline = 0
168        try:
169            for line in fd:
170                self.curline += 1
171                if self.curline > maxlines:
172                    break
173                self.lines_checked += 1
174                if line.find("SPDX-License-Identifier:") < 0:
175                    continue
176                expr = line.split(':')[1].replace('*/', '').strip()
177                self.parse(expr)
178                self.spdx_valid += 1
179                #
180                # Should we check for more SPDX ids in the same file and
181                # complain if there are any?
182                #
183                break
184
185        except ParserException as pe:
186            if pe.tok:
187                col = line.find(expr) + pe.tok.lexpos
188                tok = pe.tok.value
189                sys.stdout.write('%s: %d:%d %s: %s\n' %(fname, self.curline, col, pe.txt, tok))
190            else:
191                sys.stdout.write('%s: %d:0 %s\n' %(fname, self.curline, col, pe.txt))
192            self.spdx_errors += 1
193
194def scan_git_tree(tree):
195    for el in tree.traverse():
196        # Exclude stuff which would make pointless noise
197        # FIXME: Put this somewhere more sensible
198        if el.path.startswith("LICENSES"):
199            continue
200        if el.path.find("license-rules.rst") >= 0:
201            continue
202        if el.path == 'scripts/checkpatch.pl':
203            continue
204        if not os.path.isfile(el.path):
205            continue
206        parser.parse_lines(open(el.path), args.maxlines, el.path)
207
208def scan_git_subtree(tree, path):
209    for p in path.strip('/').split('/'):
210        tree = tree[p]
211    scan_git_tree(tree)
212
213if __name__ == '__main__':
214
215    ap = ArgumentParser(description='SPDX expression checker')
216    ap.add_argument('path', nargs='*', help='Check path or file. If not given full git tree scan. For stdin use "-"')
217    ap.add_argument('-m', '--maxlines', type=int, default=15,
218                    help='Maximum number of lines to scan in a file. Default 15')
219    ap.add_argument('-v', '--verbose', action='store_true', help='Verbose statistics output')
220    args = ap.parse_args()
221
222    # Sanity check path arguments
223    if '-' in args.path and len(args.path) > 1:
224        sys.stderr.write('stdin input "-" must be the only path argument\n')
225        sys.exit(1)
226
227    try:
228        # Use git to get the valid license expressions
229        repo = git.Repo(os.getcwd())
230        assert not repo.bare
231
232        # Initialize SPDX data
233        spdx = read_spdxdata(repo)
234
235        # Initilize the parser
236        parser = id_parser(spdx)
237
238    except SPDXException as se:
239        if se.el:
240            sys.stderr.write('%s: %s\n' %(se.el.path, se.txt))
241        else:
242            sys.stderr.write('%s\n' %se.txt)
243        sys.exit(1)
244
245    except Exception as ex:
246        sys.stderr.write('FAIL: %s\n' %ex)
247        sys.stderr.write('%s\n' %traceback.format_exc())
248        sys.exit(1)
249
250    try:
251        if len(args.path) and args.path[0] == '-':
252            parser.parse_lines(sys.stdin, args.maxlines, '-')
253        else:
254            if args.path:
255                for p in args.path:
256                    if os.path.isfile(p):
257                        parser.parse_lines(open(p), args.maxlines, p)
258                    elif os.path.isdir(p):
259                        scan_git_subtree(repo.head.reference.commit.tree, p)
260                    else:
261                        sys.stderr.write('path %s does not exist\n' %p)
262                        sys.exit(1)
263            else:
264                # Full git tree scan
265                scan_git_tree(repo.head.commit.tree)
266
267            if args.verbose:
268                sys.stderr.write('\n')
269                sys.stderr.write('License files:     %12d\n' %spdx.license_files)
270                sys.stderr.write('Exception files:   %12d\n' %spdx.exception_files)
271                sys.stderr.write('License IDs        %12d\n' %len(spdx.licenses))
272                sys.stderr.write('Exception IDs      %12d\n' %len(spdx.exceptions))
273                sys.stderr.write('\n')
274                sys.stderr.write('Files checked:     %12d\n' %parser.checked)
275                sys.stderr.write('Lines checked:     %12d\n' %parser.lines_checked)
276                sys.stderr.write('Files with SPDX:   %12d\n' %parser.spdx_valid)
277                sys.stderr.write('Files with errors: %12d\n' %parser.spdx_errors)
278
279            sys.exit(0)
280
281    except Exception as ex:
282        sys.stderr.write('FAIL: %s\n' %ex)
283        sys.stderr.write('%s\n' %traceback.format_exc())
284        sys.exit(1)
285