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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1+
#
# Simple udev rules syntax checker
#
# © 2010 Canonical Ltd.
# Author: Martin Pitt <martin.pitt@ubuntu.com>
import re
import sys
import os
from glob import glob
rules_files = sys.argv[1:]
if not rules_files:
sys.exit('Specify files to test as arguments')
quoted_string_re = r'"(?:[^\\"]|\\.)*"'
no_args_tests = re.compile(r'(ACTION|DEVPATH|KERNELS?|NAME|SYMLINK|SUBSYSTEMS?|DRIVERS?|TAG|PROGRAM|RESULT|TEST)\s*(?:=|!)=\s*' + quoted_string_re + '$')
args_tests = re.compile(r'(ATTRS?|ENV|TEST){([a-zA-Z0-9/_.*%-]+)}\s*(?:=|!)=\s*' + quoted_string_re + '$')
no_args_assign = re.compile(r'(NAME|SYMLINK|OWNER|GROUP|MODE|TAG|RUN|LABEL|GOTO|OPTIONS|IMPORT)\s*(?:\+=|:=|=)\s*' + quoted_string_re + '$')
args_assign = re.compile(r'(ATTR|ENV|IMPORT|RUN){([a-zA-Z0-9/_.*%-]+)}\s*(=|\+=)\s*' + quoted_string_re + '$')
# Find comma-separated groups, but allow commas that are inside quoted strings.
# Using quoted_string_re + '?' so that strings missing the last double quote
# will still match for this part that splits on commas.
comma_separated_group_re = re.compile(r'(?:[^,"]|' + quoted_string_re + '?)+')
result = 0
buffer = ''
for path in rules_files:
print('# looking at {}'.format(path))
lineno = 0
for line in open(path):
lineno += 1
# handle line continuation
if line.endswith('\\\n'):
buffer += line[:-2]
continue
else:
line = buffer + line
buffer = ''
# filter out comments and empty lines
line = line.strip()
if not line or line.startswith('#'):
continue
# Separator ',' is normally optional but we make it mandatory here as
# it generally improves the readability of the rules.
for clause_match in comma_separated_group_re.finditer(line):
clause = clause_match.group().strip()
if not (no_args_tests.match(clause) or args_tests.match(clause) or
no_args_assign.match(clause) or args_assign.match(clause)):
print('Invalid line {}:{}: {}'.format(path, lineno, line))
print(' clause:', clause)
print()
result = 1
break
sys.exit(result)
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