tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0
2#
3# Builds a .config from a kunitconfig.
4#
5# Copyright (C) 2019, Google LLC.
6# Author: Felix Guo <felixguoxiuping@gmail.com>
7# Author: Brendan Higgins <brendanhiggins@google.com>
8
9import collections
10import re
11from typing import List, Set
12
13CONFIG_IS_NOT_SET_PATTERN = r'^# CONFIG_(\w+) is not set$'
14CONFIG_PATTERN = r'^CONFIG_(\w+)=(\S+|".*")$'
15
16KconfigEntryBase = collections.namedtuple('KconfigEntryBase', ['name', 'value'])
17
18class KconfigEntry(KconfigEntryBase):
19
20 def __str__(self) -> str:
21 if self.value == 'n':
22 return r'# CONFIG_%s is not set' % (self.name)
23 else:
24 return r'CONFIG_%s=%s' % (self.name, self.value)
25
26
27class KconfigParseError(Exception):
28 """Error parsing Kconfig defconfig or .config."""
29
30
31class Kconfig(object):
32 """Represents defconfig or .config specified using the Kconfig language."""
33
34 def __init__(self) -> None:
35 self._entries = [] # type: List[KconfigEntry]
36
37 def entries(self) -> Set[KconfigEntry]:
38 return set(self._entries)
39
40 def add_entry(self, entry: KconfigEntry) -> None:
41 self._entries.append(entry)
42
43 def is_subset_of(self, other: 'Kconfig') -> bool:
44 other_dict = {e.name: e.value for e in other.entries()}
45 for a in self.entries():
46 b = other_dict.get(a.name)
47 if b is None:
48 if a.value == 'n':
49 continue
50 return False
51 elif a.value != b:
52 return False
53 return True
54
55 def write_to_file(self, path: str) -> None:
56 with open(path, 'w') as f:
57 for entry in self.entries():
58 f.write(str(entry) + '\n')
59
60 def parse_from_string(self, blob: str) -> None:
61 """Parses a string containing KconfigEntrys and populates this Kconfig."""
62 self._entries = []
63 is_not_set_matcher = re.compile(CONFIG_IS_NOT_SET_PATTERN)
64 config_matcher = re.compile(CONFIG_PATTERN)
65 for line in blob.split('\n'):
66 line = line.strip()
67 if not line:
68 continue
69
70 match = config_matcher.match(line)
71 if match:
72 entry = KconfigEntry(match.group(1), match.group(2))
73 self.add_entry(entry)
74 continue
75
76 empty_match = is_not_set_matcher.match(line)
77 if empty_match:
78 entry = KconfigEntry(empty_match.group(1), 'n')
79 self.add_entry(entry)
80 continue
81
82 if line[0] == '#':
83 continue
84 else:
85 raise KconfigParseError('Failed to parse: ' + line)
86
87 def read_from_file(self, path: str) -> None:
88 with open(path, 'r') as f:
89 self.parse_from_string(f.read())