#!/usr/bin/env python# SPDX-License-Identifier: GPL-2.0# Copyright Thomas Gleixner <tglx@linutronix.de> from argparse import ArgumentParserfrom ply import lex, yaccimport localeimport tracebackimport sysimport gitimport reimport os class ParserException(Exception):    def __init__(self, tok, txt):        self.tok = tok        self.txt = txt class SPDXException(Exception):    def __init__(self, el, txt):        self.el = el        self.txt = txt class SPDXdata(object):    def __init__(self):        self.license_files = 0        self.exception_files = 0        self.licenses = [ ]        self.exceptions = { } # Read the spdx data from the LICENSES directorydef read_spdxdata(repo):     # The subdirectories of LICENSES in the kernel source    license_dirs = [ "preferred", "other", "exceptions" ]    lictree = repo.head.commit.tree['LICENSES']     spdx = SPDXdata()     for d in license_dirs:        for el in lictree[d].traverse():            if not os.path.isfile(el.path):                continue             exception = None            for l in open(el.path).readlines():                if l.startswith('Valid-License-Identifier:'):                    lid = l.split(':')[1].strip().upper()                    if lid in spdx.licenses:                        raise SPDXException(el, 'Duplicate License Identifier: %s' %lid)                    else:                        spdx.licenses.append(lid)                 elif l.startswith('SPDX-Exception-Identifier:'):                    exception = l.split(':')[1].strip().upper()                    spdx.exceptions[exception] = []                 elif l.startswith('SPDX-Licenses:'):                    for lic in l.split(':')[1].upper().strip().replace(' ', '').replace('\t', '').split(','):                        if not lic in spdx.licenses:                            raise SPDXException(None, 'Exception %s missing license %s' %(ex, lic))                        spdx.exceptions[exception].append(lic)                 elif l.startswith("License-Text:"):                    if exception:                        if not len(spdx.exceptions[exception]):                            raise SPDXException(el, 'Exception %s is missing SPDX-Licenses' %excid)                        spdx.exception_files += 1                    else:                        spdx.license_files += 1                    break    return spdx class id_parser(object):     reserved = [ 'AND', 'OR', 'WITH' ]    tokens = [ 'LPAR', 'RPAR', 'ID', 'EXC' ] + reserved     precedence = ( ('nonassoc', 'AND', 'OR'), )     t_ignore = ' \t'     def __init__(self, spdx):        self.spdx = spdx        self.lasttok = None        self.lastid = None        self.lexer = lex.lex(module = self, reflags = re.UNICODE)        # Initialize the parser. No debug file and no parser rules stored on disk        # The rules are small enough to be generated on the fly        self.parser = yacc.yacc(module = self, write_tables = False, debug = False)        self.lines_checked = 0        self.checked = 0        self.spdx_valid = 0        self.spdx_errors = 0        self.curline = 0        self.deepest = 0     # Validate License and Exception IDs    def validate(self, tok):        id = tok.value.upper()        if tok.type == 'ID':            if not id in self.spdx.licenses:                raise ParserException(tok, 'Invalid License ID')            self.lastid = id        elif tok.type == 'EXC':            if id not in self.spdx.exceptions:                raise ParserException(tok, 'Invalid Exception ID')            if self.lastid not in self.spdx.exceptions[id]:                raise ParserException(tok, 'Exception not valid for license %s' %self.lastid)            self.lastid = None        elif tok.type != 'WITH':            self.lastid = None     # Lexer functions    def t_RPAR(self, tok):        r'\)'        self.lasttok = tok.type        return tok     def t_LPAR(self, tok):        r'\('        self.lasttok = tok.type        return tok     def t_ID(self, tok):        r'[A-Za-z.0-9\-+]+'         if self.lasttok == 'EXC':            print(tok)            raise ParserException(tok, 'Missing parentheses')         tok.value = tok.value.strip()        val = tok.value.upper()         if val in self.reserved:            tok.type = val        elif self.lasttok == 'WITH':            tok.type = 'EXC'         self.lasttok = tok.type        self.validate(tok)        return tok     def t_error(self, tok):        raise ParserException(tok, 'Invalid token')     def p_expr(self, p):        '''expr : ID                | ID WITH EXC                | expr AND expr                | expr OR expr                | LPAR expr RPAR'''        pass     def p_error(self, p):        if not p:            raise ParserException(None, 'Unfinished license expression')        else:            raise ParserException(p, 'Syntax error')     def parse(self, expr):        self.lasttok = None        self.lastid = None        self.parser.parse(expr, lexer = self.lexer)     def parse_lines(self, fd, maxlines, fname):        self.checked += 1        self.curline = 0        try:            for line in fd:                line = line.decode(locale.getpreferredencoding(False), errors='ignore')                self.curline += 1                if self.curline > maxlines:                    break                self.lines_checked += 1                if line.find("SPDX-License-Identifier:") < 0:                    continue                expr = line.split(':')[1].replace('*/', '').strip()                self.parse(expr)                self.spdx_valid += 1                #                # Should we check for more SPDX ids in the same file and                # complain if there are any?                #                break         except ParserException as pe:            if pe.tok:                col = line.find(expr) + pe.tok.lexpos                tok = pe.tok.value                sys.stdout.write('%s: %d:%d %s: %s\n' %(fname, self.curline, col, pe.txt, tok))            else:                sys.stdout.write('%s: %d:0 %s\n' %(fname, self.curline, col, pe.txt))            self.spdx_errors += 1 def scan_git_tree(tree):    for el in tree.traverse():        # Exclude stuff which would make pointless noise        # FIXME: Put this somewhere more sensible        if el.path.startswith("LICENSES"):            continue        if el.path.find("license-rules.rst") >= 0:            continue        if not os.path.isfile(el.path):            continue        with open(el.path, 'rb') as fd:            parser.parse_lines(fd, args.maxlines, el.path) def scan_git_subtree(tree, path):    for p in path.strip('/').split('/'):        tree = tree[p]    scan_git_tree(tree) if __name__ == '__main__':     ap = ArgumentParser(description='SPDX expression checker')    ap.add_argument('path', nargs='*', help='Check path or file. If not given full git tree scan. For stdin use "-"')    ap.add_argument('-m', '--maxlines', type=int, default=15,                    help='Maximum number of lines to scan in a file. Default 15')    ap.add_argument('-v', '--verbose', action='store_true', help='Verbose statistics output')    args = ap.parse_args()     # Sanity check path arguments    if '-' in args.path and len(args.path) > 1:        sys.stderr.write('stdin input "-" must be the only path argument\n')        sys.exit(1)     try:        # Use git to get the valid license expressions        repo = git.Repo(os.getcwd())        assert not repo.bare         # Initialize SPDX data        spdx = read_spdxdata(repo)         # Initilize the parser        parser = id_parser(spdx)     except SPDXException as se:        if se.el:            sys.stderr.write('%s: %s\n' %(se.el.path, se.txt))        else:            sys.stderr.write('%s\n' %se.txt)        sys.exit(1)     except Exception as ex:        sys.stderr.write('FAIL: %s\n' %ex)        sys.stderr.write('%s\n' %traceback.format_exc())        sys.exit(1)     try:        if len(args.path) and args.path[0] == '-':            stdin = os.fdopen(sys.stdin.fileno(), 'rb')            parser.parse_lines(stdin, args.maxlines, '-')        else:            if args.path:                for p in args.path:                    if os.path.isfile(p):                        parser.parse_lines(open(p, 'rb'), args.maxlines, p)                    elif os.path.isdir(p):                        scan_git_subtree(repo.head.reference.commit.tree, p)                    else:                        sys.stderr.write('path %s does not exist\n' %p)                        sys.exit(1)            else:                # Full git tree scan                scan_git_tree(repo.head.commit.tree)             if args.verbose:                sys.stderr.write('\n')                sys.stderr.write('License files:     %12d\n' %spdx.license_files)                sys.stderr.write('Exception files:   %12d\n' %spdx.exception_files)                sys.stderr.write('License IDs        %12d\n' %len(spdx.licenses))                sys.stderr.write('Exception IDs      %12d\n' %len(spdx.exceptions))                sys.stderr.write('\n')                sys.stderr.write('Files checked:     %12d\n' %parser.checked)                sys.stderr.write('Lines checked:     %12d\n' %parser.lines_checked)                sys.stderr.write('Files with SPDX:   %12d\n' %parser.spdx_valid)                sys.stderr.write('Files with errors: %12d\n' %parser.spdx_errors)             sys.exit(0)     except Exception as ex:        sys.stderr.write('FAIL: %s\n' %ex)        sys.stderr.write('%s\n' %traceback.format_exc())        sys.exit(1)