]> git.scottworley.com Git - pinch/blob - pinch.py
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[pinch] / pinch.py
1 import argparse
2 import configparser
3 import filecmp
4 import functools
5 import getpass
6 import hashlib
7 import operator
8 import os
9 import os.path
10 import shlex
11 import shutil
12 import subprocess
13 import sys
14 import tempfile
15 import types
16 import urllib.parse
17 import urllib.request
18 import xml.dom.minidom
19
20 from typing import (
21 Callable,
22 Dict,
23 Iterable,
24 List,
25 Mapping,
26 NamedTuple,
27 NewType,
28 Optional,
29 Set,
30 Tuple,
31 Type,
32 TypeVar,
33 Union,
34 )
35
36 # Use xdg module when it's less painful to have as a dependency
37
38
39 class XDG(NamedTuple):
40 XDG_CACHE_HOME: str
41
42
43 xdg = XDG(
44 XDG_CACHE_HOME=os.getenv(
45 'XDG_CACHE_HOME',
46 os.path.expanduser('~/.cache')))
47
48
49 class VerificationError(Exception):
50 pass
51
52
53 class Verification:
54
55 def __init__(self) -> None:
56 self.line_length = 0
57
58 def status(self, s: str) -> None:
59 print(s, end=' ', file=sys.stderr, flush=True)
60 self.line_length += 1 + len(s) # Unicode??
61
62 @staticmethod
63 def _color(s: str, c: int) -> str:
64 return '\033[%2dm%s\033[00m' % (c, s)
65
66 def result(self, r: bool) -> None:
67 message, color = {True: ('OK ', 92), False: ('FAIL', 91)}[r]
68 length = len(message)
69 cols = shutil.get_terminal_size().columns or 80
70 pad = (cols - (self.line_length + length)) % cols
71 print(' ' * pad + self._color(message, color), file=sys.stderr)
72 self.line_length = 0
73 if not r:
74 raise VerificationError()
75
76 def check(self, s: str, r: bool) -> None:
77 self.status(s)
78 self.result(r)
79
80 def ok(self) -> None:
81 self.result(True)
82
83
84 Digest16 = NewType('Digest16', str)
85 Digest32 = NewType('Digest32', str)
86
87
88 class ChannelTableEntry(types.SimpleNamespace):
89 absolute_url: str
90 digest: Digest16
91 file: str
92 size: int
93 url: str
94
95
96 class AliasPin(NamedTuple):
97 pass
98
99
100 class GitPin(NamedTuple):
101 git_revision: str
102 release_name: str
103
104
105 class ChannelPin(NamedTuple):
106 git_revision: str
107 release_name: str
108 tarball_url: str
109 tarball_sha256: str
110
111
112 Pin = Union[AliasPin, GitPin, ChannelPin]
113
114
115 class AliasSearchPath(NamedTuple):
116 alias_of: str
117
118 # pylint: disable=no-self-use
119 def pin(self, _: Verification, __: Optional[Pin]) -> AliasPin:
120 return AliasPin()
121
122
123 class GitSearchPath(NamedTuple):
124 git_ref: str
125 git_repo: str
126
127 def pin(self, v: Verification, old_pin: Optional[Pin]) -> GitPin:
128 if old_pin is not None:
129 assert isinstance(old_pin, GitPin)
130 old_revision = old_pin.git_revision if old_pin is not None else None
131
132 new_revision = git_fetch(v, self, None, old_revision)
133 return GitPin(release_name=git_revision_name(v, self, new_revision),
134 git_revision=new_revision)
135
136 def fetch(self, v: Verification, pin: Pin) -> str:
137 assert isinstance(pin, GitPin)
138 ensure_git_rev_available(v, self, pin, None)
139 return git_get_tarball(v, self, pin)
140
141
142 class ChannelSearchPath(NamedTuple):
143 channel_url: str
144 git_ref: str
145 git_repo: str
146
147 def pin(self, v: Verification, old_pin: Optional[Pin]) -> ChannelPin:
148 if old_pin is not None:
149 assert isinstance(old_pin, ChannelPin)
150 old_revision = old_pin.git_revision if old_pin is not None else None
151
152 channel_html, forwarded_url = fetch_channel(v, self)
153 table, new_gitpin = parse_channel(v, channel_html)
154 fetch_resources(v, new_gitpin, forwarded_url, table)
155 ensure_git_rev_available(v, self, new_gitpin, old_revision)
156 check_channel_contents(v, self, table, new_gitpin)
157 return ChannelPin(
158 release_name=new_gitpin.release_name,
159 tarball_url=table['nixexprs.tar.xz'].absolute_url,
160 tarball_sha256=table['nixexprs.tar.xz'].digest,
161 git_revision=new_gitpin.git_revision)
162
163 # pylint: disable=no-self-use
164 def fetch(self, v: Verification, pin: Pin) -> str:
165 assert isinstance(pin, ChannelPin)
166
167 return fetch_with_nix_prefetch_url(
168 v, pin.tarball_url, Digest16(pin.tarball_sha256))
169
170
171 SearchPath = Union[AliasSearchPath, GitSearchPath, ChannelSearchPath]
172 TarrableSearchPath = Union[GitSearchPath, ChannelSearchPath]
173
174
175 def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]:
176
177 def throw(error: OSError) -> None:
178 raise error
179
180 def join(x: str, y: str) -> str:
181 return y if x == '.' else os.path.join(x, y)
182
183 def recursive_files(d: str) -> Iterable[str]:
184 all_files: List[str] = []
185 for path, dirs, files in os.walk(d, onerror=throw):
186 rel = os.path.relpath(path, start=d)
187 all_files.extend(join(rel, f) for f in files)
188 for dir_or_link in dirs:
189 if os.path.islink(join(path, dir_or_link)):
190 all_files.append(join(rel, dir_or_link))
191 return all_files
192
193 def exclude_dot_git(files: Iterable[str]) -> Iterable[str]:
194 return (f for f in files if not f.startswith('.git/'))
195
196 files = functools.reduce(
197 operator.or_, (set(
198 exclude_dot_git(
199 recursive_files(x))) for x in [a, b]))
200 return filecmp.cmpfiles(a, b, files, shallow=False)
201
202
203 def fetch_channel(
204 v: Verification, channel: ChannelSearchPath) -> Tuple[str, str]:
205 v.status('Fetching channel')
206 request = urllib.request.urlopen(channel.channel_url, timeout=10)
207 channel_html = request.read()
208 forwarded_url = request.geturl()
209 v.result(request.status == 200) # type: ignore # (for old mypy)
210 v.check('Got forwarded', channel.channel_url != forwarded_url)
211 return channel_html, forwarded_url
212
213
214 def parse_channel(v: Verification, channel_html: str) \
215 -> Tuple[Dict[str, ChannelTableEntry], GitPin]:
216 v.status('Parsing channel description as XML')
217 d = xml.dom.minidom.parseString(channel_html)
218 v.ok()
219
220 v.status('Extracting release name:')
221 title_name = d.getElementsByTagName(
222 'title')[0].firstChild.nodeValue.split()[2]
223 h1_name = d.getElementsByTagName('h1')[0].firstChild.nodeValue.split()[2]
224 v.status(title_name)
225 v.result(title_name == h1_name)
226
227 v.status('Extracting git commit:')
228 git_commit_node = d.getElementsByTagName('tt')[0]
229 git_revision = git_commit_node.firstChild.nodeValue
230 v.status(git_revision)
231 v.ok()
232 v.status('Verifying git commit label')
233 v.result(git_commit_node.previousSibling.nodeValue == 'Git commit ')
234
235 v.status('Parsing table')
236 table: Dict[str, ChannelTableEntry] = {}
237 for row in d.getElementsByTagName('tr')[1:]:
238 name = row.childNodes[0].firstChild.firstChild.nodeValue
239 url = row.childNodes[0].firstChild.getAttribute('href')
240 size = int(row.childNodes[1].firstChild.nodeValue)
241 digest = Digest16(row.childNodes[2].firstChild.firstChild.nodeValue)
242 table[name] = ChannelTableEntry(url=url, digest=digest, size=size)
243 v.ok()
244 return table, GitPin(release_name=title_name, git_revision=git_revision)
245
246
247 def digest_string(s: bytes) -> Digest16:
248 return Digest16(hashlib.sha256(s).hexdigest())
249
250
251 def digest_file(filename: str) -> Digest16:
252 hasher = hashlib.sha256()
253 with open(filename, 'rb') as f:
254 # pylint: disable=cell-var-from-loop
255 for block in iter(lambda: f.read(4096), b''):
256 hasher.update(block)
257 return Digest16(hasher.hexdigest())
258
259
260 def to_Digest16(v: Verification, digest32: Digest32) -> Digest16:
261 v.status('Converting digest to base16')
262 process = subprocess.run(
263 ['nix', 'to-base16', '--type', 'sha256', digest32], stdout=subprocess.PIPE)
264 v.result(process.returncode == 0)
265 return Digest16(process.stdout.decode().strip())
266
267
268 def to_Digest32(v: Verification, digest16: Digest16) -> Digest32:
269 v.status('Converting digest to base32')
270 process = subprocess.run(
271 ['nix', 'to-base32', '--type', 'sha256', digest16], stdout=subprocess.PIPE)
272 v.result(process.returncode == 0)
273 return Digest32(process.stdout.decode().strip())
274
275
276 def fetch_with_nix_prefetch_url(
277 v: Verification,
278 url: str,
279 digest: Digest16) -> str:
280 v.status('Fetching %s' % url)
281 process = subprocess.run(
282 ['nix-prefetch-url', '--print-path', url, digest], stdout=subprocess.PIPE)
283 v.result(process.returncode == 0)
284 prefetch_digest, path, empty = process.stdout.decode().split('\n')
285 assert empty == ''
286 v.check("Verifying nix-prefetch-url's digest",
287 to_Digest16(v, Digest32(prefetch_digest)) == digest)
288 v.status("Verifying file digest")
289 file_digest = digest_file(path)
290 v.result(file_digest == digest)
291 return path # type: ignore # (for old mypy)
292
293
294 def fetch_resources(
295 v: Verification,
296 pin: GitPin,
297 forwarded_url: str,
298 table: Dict[str, ChannelTableEntry]) -> None:
299 for resource in ['git-revision', 'nixexprs.tar.xz']:
300 fields = table[resource]
301 fields.absolute_url = urllib.parse.urljoin(forwarded_url, fields.url)
302 fields.file = fetch_with_nix_prefetch_url(
303 v, fields.absolute_url, fields.digest)
304 v.status('Verifying git commit on main page matches git commit in table')
305 v.result(open(table['git-revision'].file).read(999) == pin.git_revision)
306
307
308 def git_cachedir(git_repo: str) -> str:
309 return os.path.join(
310 xdg.XDG_CACHE_HOME,
311 'pinch/git',
312 digest_string(git_repo.encode()))
313
314
315 def tarball_cache_file(channel: TarrableSearchPath, pin: GitPin) -> str:
316 return os.path.join(
317 xdg.XDG_CACHE_HOME,
318 'pinch/git-tarball',
319 '%s-%s-%s' %
320 (digest_string(channel.git_repo.encode()),
321 pin.git_revision,
322 pin.release_name))
323
324
325 def verify_git_ancestry(
326 v: Verification,
327 channel: TarrableSearchPath,
328 new_revision: str,
329 old_revision: Optional[str]) -> None:
330 cachedir = git_cachedir(channel.git_repo)
331 v.status('Verifying rev is an ancestor of ref')
332 process = subprocess.run(['git',
333 '-C',
334 cachedir,
335 'merge-base',
336 '--is-ancestor',
337 new_revision,
338 channel.git_ref])
339 v.result(process.returncode == 0)
340
341 if old_revision is not None:
342 v.status(
343 'Verifying rev is an ancestor of previous rev %s' %
344 old_revision)
345 process = subprocess.run(['git',
346 '-C',
347 cachedir,
348 'merge-base',
349 '--is-ancestor',
350 old_revision,
351 new_revision])
352 v.result(process.returncode == 0)
353
354
355 def git_fetch(
356 v: Verification,
357 channel: TarrableSearchPath,
358 desired_revision: Optional[str],
359 old_revision: Optional[str]) -> str:
360 # It would be nice if we could share the nix git cache, but as of the time
361 # of writing it is transitioning from gitv2 (deprecated) to gitv3 (not ready
362 # yet), and trying to straddle them both is too far into nix implementation
363 # details for my comfort. So we re-implement here half of nix.fetchGit.
364 # :(
365
366 cachedir = git_cachedir(channel.git_repo)
367 if not os.path.exists(cachedir):
368 v.status("Initializing git repo")
369 process = subprocess.run(
370 ['git', 'init', '--bare', cachedir])
371 v.result(process.returncode == 0)
372
373 v.status('Fetching ref "%s" from %s' % (channel.git_ref, channel.git_repo))
374 # We don't use --force here because we want to abort and freak out if forced
375 # updates are happening.
376 process = subprocess.run(['git',
377 '-C',
378 cachedir,
379 'fetch',
380 channel.git_repo,
381 '%s:%s' % (channel.git_ref,
382 channel.git_ref)])
383 v.result(process.returncode == 0)
384
385 if desired_revision is not None:
386 v.status('Verifying that fetch retrieved this rev')
387 process = subprocess.run(
388 ['git', '-C', cachedir, 'cat-file', '-e', desired_revision])
389 v.result(process.returncode == 0)
390
391 new_revision = open(
392 os.path.join(
393 cachedir,
394 'refs',
395 'heads',
396 channel.git_ref)).read(999).strip()
397
398 verify_git_ancestry(v, channel, new_revision, old_revision)
399
400 return new_revision
401
402
403 def ensure_git_rev_available(
404 v: Verification,
405 channel: TarrableSearchPath,
406 pin: GitPin,
407 old_revision: Optional[str]) -> None:
408 cachedir = git_cachedir(channel.git_repo)
409 if os.path.exists(cachedir):
410 v.status('Checking if we already have this rev:')
411 process = subprocess.run(
412 ['git', '-C', cachedir, 'cat-file', '-e', pin.git_revision])
413 if process.returncode == 0:
414 v.status('yes')
415 if process.returncode == 1:
416 v.status('no')
417 v.result(process.returncode == 0 or process.returncode == 1)
418 if process.returncode == 0:
419 verify_git_ancestry(v, channel, pin.git_revision, old_revision)
420 return
421 git_fetch(v, channel, pin.git_revision, old_revision)
422
423
424 def compare_tarball_and_git(
425 v: Verification,
426 pin: GitPin,
427 channel_contents: str,
428 git_contents: str) -> None:
429 v.status('Comparing channel tarball with git checkout')
430 match, mismatch, errors = compare(os.path.join(
431 channel_contents, pin.release_name), git_contents)
432 v.ok()
433 v.check('%d files match' % len(match), len(match) > 0)
434 v.check('%d files differ' % len(mismatch), len(mismatch) == 0)
435 expected_errors = [
436 '.git-revision',
437 '.version-suffix',
438 'nixpkgs',
439 'programs.sqlite',
440 'svn-revision']
441 benign_errors = []
442 for ee in expected_errors:
443 if ee in errors:
444 errors.remove(ee)
445 benign_errors.append(ee)
446 v.check(
447 '%d unexpected incomparable files' %
448 len(errors),
449 len(errors) == 0)
450 v.check(
451 '(%d of %d expected incomparable files)' %
452 (len(benign_errors),
453 len(expected_errors)),
454 len(benign_errors) == len(expected_errors))
455
456
457 def extract_tarball(
458 v: Verification,
459 table: Dict[str, ChannelTableEntry],
460 dest: str) -> None:
461 v.status('Extracting tarball %s' % table['nixexprs.tar.xz'].file)
462 shutil.unpack_archive(table['nixexprs.tar.xz'].file, dest)
463 v.ok()
464
465
466 def git_checkout(
467 v: Verification,
468 channel: TarrableSearchPath,
469 pin: GitPin,
470 dest: str) -> None:
471 v.status('Checking out corresponding git revision')
472 git = subprocess.Popen(['git',
473 '-C',
474 git_cachedir(channel.git_repo),
475 'archive',
476 pin.git_revision],
477 stdout=subprocess.PIPE)
478 tar = subprocess.Popen(
479 ['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout)
480 if git.stdout:
481 git.stdout.close()
482 tar.wait()
483 git.wait()
484 v.result(git.returncode == 0 and tar.returncode == 0)
485
486
487 def git_get_tarball(
488 v: Verification,
489 channel: TarrableSearchPath,
490 pin: GitPin) -> str:
491 cache_file = tarball_cache_file(channel, pin)
492 if os.path.exists(cache_file):
493 cached_tarball = open(cache_file).read(9999)
494 if os.path.exists(cached_tarball):
495 return cached_tarball
496
497 with tempfile.TemporaryDirectory() as output_dir:
498 output_filename = os.path.join(
499 output_dir, pin.release_name + '.tar.xz')
500 with open(output_filename, 'w') as output_file:
501 v.status(
502 'Generating tarball for git revision %s' %
503 pin.git_revision)
504 git = subprocess.Popen(['git',
505 '-C',
506 git_cachedir(channel.git_repo),
507 'archive',
508 '--prefix=%s/' % pin.release_name,
509 pin.git_revision],
510 stdout=subprocess.PIPE)
511 xz = subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file)
512 xz.wait()
513 git.wait()
514 v.result(git.returncode == 0 and xz.returncode == 0)
515
516 v.status('Putting tarball in Nix store')
517 process = subprocess.run(
518 ['nix-store', '--add', output_filename], stdout=subprocess.PIPE)
519 v.result(process.returncode == 0)
520 store_tarball = process.stdout.decode().strip()
521
522 os.makedirs(os.path.dirname(cache_file), exist_ok=True)
523 open(cache_file, 'w').write(store_tarball)
524 return store_tarball # type: ignore # (for old mypy)
525
526
527 def check_channel_metadata(
528 v: Verification,
529 pin: GitPin,
530 channel_contents: str) -> None:
531 v.status('Verifying git commit in channel tarball')
532 v.result(
533 open(
534 os.path.join(
535 channel_contents,
536 pin.release_name,
537 '.git-revision')).read(999) == pin.git_revision)
538
539 v.status(
540 'Verifying version-suffix is a suffix of release name %s:' %
541 pin.release_name)
542 version_suffix = open(
543 os.path.join(
544 channel_contents,
545 pin.release_name,
546 '.version-suffix')).read(999)
547 v.status(version_suffix)
548 v.result(pin.release_name.endswith(version_suffix))
549
550
551 def check_channel_contents(
552 v: Verification,
553 channel: TarrableSearchPath,
554 table: Dict[str, ChannelTableEntry],
555 pin: GitPin) -> None:
556 with tempfile.TemporaryDirectory() as channel_contents, \
557 tempfile.TemporaryDirectory() as git_contents:
558
559 extract_tarball(v, table, channel_contents)
560 check_channel_metadata(v, pin, channel_contents)
561
562 git_checkout(v, channel, pin, git_contents)
563
564 compare_tarball_and_git(v, pin, channel_contents, git_contents)
565
566 v.status('Removing temporary directories')
567 v.ok()
568
569
570 def git_revision_name(
571 v: Verification,
572 channel: TarrableSearchPath,
573 git_revision: str) -> str:
574 v.status('Getting commit date')
575 process = subprocess.run(['git',
576 '-C',
577 git_cachedir(channel.git_repo),
578 'log',
579 '-n1',
580 '--format=%ct-%h',
581 '--abbrev=11',
582 '--no-show-signature',
583 git_revision],
584 stdout=subprocess.PIPE)
585 v.result(process.returncode == 0 and process.stdout != b'')
586 return '%s-%s' % (os.path.basename(channel.git_repo),
587 process.stdout.decode().strip())
588
589
590 K = TypeVar('K')
591 V = TypeVar('V')
592
593
594 def partition_dict(pred: Callable[[K, V], bool],
595 d: Dict[K, V]) -> Tuple[Dict[K, V], Dict[K, V]]:
596 selected: Dict[K, V] = {}
597 remaining: Dict[K, V] = {}
598 for k, v in d.items():
599 if pred(k, v):
600 selected[k] = v
601 else:
602 remaining[k] = v
603 return selected, remaining
604
605
606 def filter_dict(d: Dict[K, V], fields: Set[K]
607 ) -> Tuple[Dict[K, V], Dict[K, V]]:
608 return partition_dict(lambda k, v: k in fields, d)
609
610
611 def read_config_section(
612 conf: configparser.SectionProxy) -> Tuple[SearchPath, Optional[Pin]]:
613 mapping: Mapping[str, Tuple[Type[SearchPath], Type[Pin]]] = {
614 'alias': (AliasSearchPath, AliasPin),
615 'channel': (ChannelSearchPath, ChannelPin),
616 'git': (GitSearchPath, GitPin),
617 }
618 SP, P = mapping[conf['type']]
619 _, all_fields = filter_dict(dict(conf.items()), set(['type']))
620 pin_fields, remaining_fields = filter_dict(all_fields, set(P._fields))
621 # Error suppression works around https://github.com/python/mypy/issues/9007
622 pin_present = pin_fields != {} or P._fields == ()
623 pin = P(**pin_fields) if pin_present else None # type:ignore[call-arg]
624 return SP(**remaining_fields), pin
625
626
627 def read_pinned_config_section(
628 section: str, conf: configparser.SectionProxy) -> Tuple[SearchPath, Pin]:
629 sp, pin = read_config_section(conf)
630 if pin is None:
631 raise Exception(
632 'Cannot update unpinned channel "%s" (Run "pin" before "update")' %
633 section)
634 return sp, pin
635
636
637 def read_config(filename: str) -> configparser.ConfigParser:
638 config = configparser.ConfigParser()
639 config.read_file(open(filename), filename)
640 return config
641
642
643 def read_config_files(
644 filenames: Iterable[str]) -> Dict[str, configparser.SectionProxy]:
645 merged_config: Dict[str, configparser.SectionProxy] = {}
646 for file in filenames:
647 config = read_config(file)
648 for section in config.sections():
649 if section in merged_config:
650 raise Exception('Duplicate channel "%s"' % section)
651 merged_config[section] = config[section]
652 return merged_config
653
654
655 def pinCommand(args: argparse.Namespace) -> None:
656 v = Verification()
657 config = read_config(args.channels_file)
658 for section in config.sections():
659 if args.channels and section not in args.channels:
660 continue
661
662 sp, old_pin = read_config_section(config[section])
663
664 config[section].update(sp.pin(v, old_pin)._asdict())
665
666 with open(args.channels_file, 'w') as configfile:
667 config.write(configfile)
668
669
670 def updateCommand(args: argparse.Namespace) -> None:
671 v = Verification()
672 exprs: Dict[str, str] = {}
673 config = {
674 section: read_pinned_config_section(section, conf) for section,
675 conf in read_config_files(
676 args.channels_file).items()}
677 alias, nonalias = partition_dict(
678 lambda k, v: isinstance(v[0], AliasSearchPath), config)
679
680 for section, (sp, pin) in nonalias.items():
681 assert not isinstance(sp, AliasSearchPath) # mypy can't see through
682 assert not isinstance(pin, AliasPin) # partition_dict()
683 tarball = sp.fetch(v, pin)
684 exprs[section] = (
685 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' %
686 (pin.release_name, tarball))
687
688 for section, (sp, pin) in alias.items():
689 assert isinstance(sp, AliasSearchPath) # For mypy
690 exprs[section] = exprs[sp.alias_of]
691
692 command = [
693 'nix-env',
694 '--profile',
695 '/nix/var/nix/profiles/per-user/%s/channels' %
696 getpass.getuser(),
697 '--show-trace',
698 '--file',
699 '<nix/unpack-channel.nix>',
700 '--install',
701 '--from-expression'] + [exprs[name] % name for name in sorted(exprs.keys())]
702 if args.dry_run:
703 print(' '.join(map(shlex.quote, command)))
704 else:
705 v.status('Installing channels with nix-env')
706 process = subprocess.run(command)
707 v.result(process.returncode == 0)
708
709
710 def main() -> None:
711 parser = argparse.ArgumentParser(prog='pinch')
712 subparsers = parser.add_subparsers(dest='mode', required=True)
713 parser_pin = subparsers.add_parser('pin')
714 parser_pin.add_argument('channels_file', type=str)
715 parser_pin.add_argument('channels', type=str, nargs='*')
716 parser_pin.set_defaults(func=pinCommand)
717 parser_update = subparsers.add_parser('update')
718 parser_update.add_argument('--dry-run', action='store_true')
719 parser_update.add_argument('channels_file', type=str, nargs='+')
720 parser_update.set_defaults(func=updateCommand)
721 args = parser.parse_args()
722 args.func(args)
723
724
725 if __name__ == '__main__':
726 main()