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[pinch] / pinch.py
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0e5e611d 1import argparse
f15e458d 2import configparser
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3import filecmp
4import functools
736c25eb 5import getpass
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6import hashlib
7import operator
8import os
9import os.path
9a78329e 10import shlex
2f96f32a 11import shutil
73bec7e8 12import subprocess
9d7844bb 13import sys
0afcdb2a 14import tarfile
2f96f32a 15import tempfile
89e79125 16import types
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17import urllib.parse
18import urllib.request
19import xml.dom.minidom
20
21from typing import (
9d2c406b 22 Callable,
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23 Dict,
24 Iterable,
25 List,
7f4c3ace 26 Mapping,
0a4ff8dd 27 NamedTuple,
73bec7e8 28 NewType,
d7cfdb22 29 Optional,
567a6783 30 Set,
2f96f32a 31 Tuple,
7f4c3ace 32 Type,
567a6783 33 TypeVar,
0a4ff8dd 34 Union,
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35)
36
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37import git_cache
38
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39# Use xdg module when it's less painful to have as a dependency
40
41
9f936f16 42class XDG(NamedTuple):
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43 XDG_CACHE_HOME: str
44
45
46xdg = XDG(
47 XDG_CACHE_HOME=os.getenv(
48 'XDG_CACHE_HOME',
49 os.path.expanduser('~/.cache')))
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50
51
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52class VerificationError(Exception):
53 pass
54
55
56class Verification:
57
58 def __init__(self) -> None:
59 self.line_length = 0
60
61 def status(self, s: str) -> None:
9d7844bb 62 print(s, end=' ', file=sys.stderr, flush=True)
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63 self.line_length += 1 + len(s) # Unicode??
64
65 @staticmethod
66 def _color(s: str, c: int) -> str:
67 return '\033[%2dm%s\033[00m' % (c, s)
68
69 def result(self, r: bool) -> None:
70 message, color = {True: ('OK ', 92), False: ('FAIL', 91)}[r]
71 length = len(message)
dd1026fe 72 cols = shutil.get_terminal_size().columns or 80
2f96f32a 73 pad = (cols - (self.line_length + length)) % cols
9d7844bb 74 print(' ' * pad + self._color(message, color), file=sys.stderr)
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75 self.line_length = 0
76 if not r:
77 raise VerificationError()
78
79 def check(self, s: str, r: bool) -> None:
80 self.status(s)
81 self.result(r)
82
83 def ok(self) -> None:
84 self.result(True)
85
86
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87Digest16 = NewType('Digest16', str)
88Digest32 = NewType('Digest32', str)
89
90
91class ChannelTableEntry(types.SimpleNamespace):
92 absolute_url: str
93 digest: Digest16
94 file: str
95 size: int
96 url: str
97
98
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99class AliasPin(NamedTuple):
100 pass
101
102
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103class SymlinkPin(NamedTuple):
104 @property
105 def release_name(self) -> str:
106 return 'link'
107
108
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109class GitPin(NamedTuple):
110 git_revision: str
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111 release_name: str
112
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113
114class ChannelPin(NamedTuple):
115 git_revision: str
116 release_name: str
117 tarball_url: str
118 tarball_sha256: str
119
120
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121Pin = Union[AliasPin, SymlinkPin, GitPin, ChannelPin]
122
123
124def copy_to_nix_store(v: Verification, filename: str) -> str:
125 v.status('Putting tarball in Nix store')
126 process = subprocess.run(
127 ['nix-store', '--add', filename], stdout=subprocess.PIPE)
128 v.result(process.returncode == 0)
530104d7 129 return process.stdout.decode().strip() # type: ignore # (for old mypy)
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130
131
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132def symlink_archive(v: Verification, path: str) -> str:
133 with tempfile.TemporaryDirectory() as td:
134 archive_filename = os.path.join(td, 'link.tar.gz')
135 os.symlink(path, os.path.join(td, 'link'))
136 with tarfile.open(archive_filename, mode='x:gz') as t:
137 t.add(os.path.join(td, 'link'), arcname='link')
138 return copy_to_nix_store(v, archive_filename)
139
140
567a6783 141class AliasSearchPath(NamedTuple):
faff8642 142 alias_of: str
2fa9cbea 143
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144 # pylint: disable=no-self-use
145 def pin(self, _: Verification, __: Optional[Pin]) -> AliasPin:
0a4ff8dd 146 return AliasPin()
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147
148
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149class SymlinkSearchPath(NamedTuple):
150 path: str
151
152 # pylint: disable=no-self-use
153 def pin(self, _: Verification, __: Optional[Pin]) -> SymlinkPin:
154 return SymlinkPin()
155
156 def fetch(self, v: Verification, _: Pin) -> str:
96063a51 157 return symlink_archive(v, self.path)
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158
159
567a6783 160class GitSearchPath(NamedTuple):
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161 git_ref: str
162 git_repo: str
faff8642 163
567a6783 164 def pin(self, v: Verification, old_pin: Optional[Pin]) -> GitPin:
d06918bc 165 _, new_revision = git_cache.fetch(self.git_repo, self.git_ref)
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166 if old_pin is not None:
167 assert isinstance(old_pin, GitPin)
d06918bc 168 verify_git_ancestry(v, self, old_pin.git_revision, new_revision)
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169 return GitPin(release_name=git_revision_name(v, self, new_revision),
170 git_revision=new_revision)
4a82be40 171
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172 def fetch(self, v: Verification, pin: Pin) -> str:
173 assert isinstance(pin, GitPin)
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174 git_cache.ensure_rev_available(
175 self.git_repo, self.git_ref, pin.git_revision)
567a6783 176 return git_get_tarball(v, self, pin)
b3ea39b8 177
b3ea39b8 178
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179class ChannelSearchPath(NamedTuple):
180 channel_url: str
181 git_ref: str
182 git_repo: str
4a82be40 183
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184 def pin(self, v: Verification, old_pin: Optional[Pin]) -> ChannelPin:
185 if old_pin is not None:
186 assert isinstance(old_pin, ChannelPin)
a67cfec9 187
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188 channel_html, forwarded_url = fetch_channel(v, self)
189 table, new_gitpin = parse_channel(v, channel_html)
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190 if old_pin is not None and old_pin.git_revision == new_gitpin.git_revision:
191 return old_pin
567a6783 192 fetch_resources(v, new_gitpin, forwarded_url, table)
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193 git_cache.ensure_rev_available(
194 self.git_repo, self.git_ref, new_gitpin.git_revision)
195 if old_pin is not None:
196 verify_git_ancestry(
197 v, self, old_pin.git_revision, new_gitpin.git_revision)
567a6783 198 check_channel_contents(v, self, table, new_gitpin)
0a4ff8dd 199 return ChannelPin(
b17278e3 200 release_name=new_gitpin.release_name,
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201 tarball_url=table['nixexprs.tar.xz'].absolute_url,
202 tarball_sha256=table['nixexprs.tar.xz'].digest,
3258ff2c 203 git_revision=new_gitpin.git_revision)
4a82be40 204
b3ea39b8 205 # pylint: disable=no-self-use
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206 def fetch(self, v: Verification, pin: Pin) -> str:
207 assert isinstance(pin, ChannelPin)
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208
209 return fetch_with_nix_prefetch_url(
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210 v, pin.tarball_url, Digest16(pin.tarball_sha256))
211
212
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213SearchPath = Union[AliasSearchPath,
214 SymlinkSearchPath,
215 GitSearchPath,
216 ChannelSearchPath]
567a6783 217TarrableSearchPath = Union[GitSearchPath, ChannelSearchPath]
b3ea39b8 218
4a82be40 219
dc038df0 220def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]:
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221
222 def throw(error: OSError) -> None:
223 raise error
224
225 def join(x: str, y: str) -> str:
226 return y if x == '.' else os.path.join(x, y)
227
228 def recursive_files(d: str) -> Iterable[str]:
229 all_files: List[str] = []
230 for path, dirs, files in os.walk(d, onerror=throw):
231 rel = os.path.relpath(path, start=d)
232 all_files.extend(join(rel, f) for f in files)
233 for dir_or_link in dirs:
234 if os.path.islink(join(path, dir_or_link)):
235 all_files.append(join(rel, dir_or_link))
236 return all_files
237
238 def exclude_dot_git(files: Iterable[str]) -> Iterable[str]:
239 return (f for f in files if not f.startswith('.git/'))
240
241 files = functools.reduce(
242 operator.or_, (set(
243 exclude_dot_git(
244 recursive_files(x))) for x in [a, b]))
245 return filecmp.cmpfiles(a, b, files, shallow=False)
246
247
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248def fetch_channel(
249 v: Verification, channel: ChannelSearchPath) -> Tuple[str, str]:
2f96f32a 250 v.status('Fetching channel')
b17def3f 251 request = urllib.request.urlopen(channel.channel_url, timeout=10)
530104d7 252 channel_html = request.read().decode()
567a6783 253 forwarded_url = request.geturl()
7c4de64c 254 v.result(request.status == 200) # type: ignore # (for old mypy)
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255 v.check('Got forwarded', channel.channel_url != forwarded_url)
256 return channel_html, forwarded_url
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257
258
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259def parse_channel(v: Verification, channel_html: str) \
260 -> Tuple[Dict[str, ChannelTableEntry], GitPin]:
2f96f32a 261 v.status('Parsing channel description as XML')
567a6783 262 d = xml.dom.minidom.parseString(channel_html)
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263 v.ok()
264
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265 v.status('Extracting release name:')
266 title_name = d.getElementsByTagName(
267 'title')[0].firstChild.nodeValue.split()[2]
268 h1_name = d.getElementsByTagName('h1')[0].firstChild.nodeValue.split()[2]
269 v.status(title_name)
270 v.result(title_name == h1_name)
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271
272 v.status('Extracting git commit:')
2f96f32a 273 git_commit_node = d.getElementsByTagName('tt')[0]
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274 git_revision = git_commit_node.firstChild.nodeValue
275 v.status(git_revision)
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276 v.ok()
277 v.status('Verifying git commit label')
278 v.result(git_commit_node.previousSibling.nodeValue == 'Git commit ')
279
280 v.status('Parsing table')
567a6783 281 table: Dict[str, ChannelTableEntry] = {}
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282 for row in d.getElementsByTagName('tr')[1:]:
283 name = row.childNodes[0].firstChild.firstChild.nodeValue
284 url = row.childNodes[0].firstChild.getAttribute('href')
285 size = int(row.childNodes[1].firstChild.nodeValue)
73bec7e8 286 digest = Digest16(row.childNodes[2].firstChild.firstChild.nodeValue)
567a6783 287 table[name] = ChannelTableEntry(url=url, digest=digest, size=size)
2f96f32a 288 v.ok()
567a6783 289 return table, GitPin(release_name=title_name, git_revision=git_revision)
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290
291
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292def digest_string(s: bytes) -> Digest16:
293 return Digest16(hashlib.sha256(s).hexdigest())
294
295
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296def digest_file(filename: str) -> Digest16:
297 hasher = hashlib.sha256()
298 with open(filename, 'rb') as f:
299 # pylint: disable=cell-var-from-loop
300 for block in iter(lambda: f.read(4096), b''):
301 hasher.update(block)
302 return Digest16(hasher.hexdigest())
303
304
305def to_Digest16(v: Verification, digest32: Digest32) -> Digest16:
306 v.status('Converting digest to base16')
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307 process = subprocess.run(['nix',
308 '--experimental-features',
309 'nix-command',
310 'to-base16',
311 '--type',
312 'sha256',
313 digest32],
314 stdout=subprocess.PIPE)
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315 v.result(process.returncode == 0)
316 return Digest16(process.stdout.decode().strip())
317
318
319def to_Digest32(v: Verification, digest16: Digest16) -> Digest32:
320 v.status('Converting digest to base32')
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321 process = subprocess.run(['nix',
322 '--experimental-features',
323 'nix-command',
324 'to-base32',
325 '--type',
326 'sha256',
327 digest16],
328 stdout=subprocess.PIPE)
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329 v.result(process.returncode == 0)
330 return Digest32(process.stdout.decode().strip())
331
332
333def fetch_with_nix_prefetch_url(
334 v: Verification,
335 url: str,
336 digest: Digest16) -> str:
337 v.status('Fetching %s' % url)
338 process = subprocess.run(
ba596fc0 339 ['nix-prefetch-url', '--print-path', url, digest], stdout=subprocess.PIPE)
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340 v.result(process.returncode == 0)
341 prefetch_digest, path, empty = process.stdout.decode().split('\n')
342 assert empty == ''
343 v.check("Verifying nix-prefetch-url's digest",
344 to_Digest16(v, Digest32(prefetch_digest)) == digest)
345 v.status("Verifying file digest")
346 file_digest = digest_file(path)
347 v.result(file_digest == digest)
7c4de64c 348 return path # type: ignore # (for old mypy)
2f96f32a 349
73bec7e8 350
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351def fetch_resources(
352 v: Verification,
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353 pin: GitPin,
354 forwarded_url: str,
355 table: Dict[str, ChannelTableEntry]) -> None:
2f96f32a 356 for resource in ['git-revision', 'nixexprs.tar.xz']:
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357 fields = table[resource]
358 fields.absolute_url = urllib.parse.urljoin(forwarded_url, fields.url)
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359 fields.file = fetch_with_nix_prefetch_url(
360 v, fields.absolute_url, fields.digest)
73bec7e8 361 v.status('Verifying git commit on main page matches git commit in table')
567a6783 362 v.result(open(table['git-revision'].file).read(999) == pin.git_revision)
2f96f32a 363
971d3659 364
b17278e3 365def tarball_cache_file(channel: TarrableSearchPath, pin: GitPin) -> str:
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366 return os.path.join(
367 xdg.XDG_CACHE_HOME,
368 'pinch/git-tarball',
369 '%s-%s-%s' %
370 (digest_string(channel.git_repo.encode()),
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371 pin.git_revision,
372 pin.release_name))
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373
374
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375def verify_git_ancestry(
376 v: Verification,
377 channel: TarrableSearchPath,
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378 old_revision: str,
379 new_revision: str) -> None:
380 cachedir = git_cache.git_cachedir(channel.git_repo)
381 v.status('Verifying rev is an ancestor of previous rev %s' % old_revision)
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382 process = subprocess.run(['git',
383 '-C',
384 cachedir,
385 'merge-base',
386 '--is-ancestor',
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387 old_revision,
388 new_revision])
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389 v.result(process.returncode == 0)
390
dc038df0 391
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392def compare_tarball_and_git(
393 v: Verification,
a72fdca9 394 pin: GitPin,
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395 channel_contents: str,
396 git_contents: str) -> None:
397 v.status('Comparing channel tarball with git checkout')
398 match, mismatch, errors = compare(os.path.join(
a72fdca9 399 channel_contents, pin.release_name), git_contents)
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400 v.ok()
401 v.check('%d files match' % len(match), len(match) > 0)
402 v.check('%d files differ' % len(mismatch), len(mismatch) == 0)
403 expected_errors = [
404 '.git-revision',
405 '.version-suffix',
406 'nixpkgs',
407 'programs.sqlite',
408 'svn-revision']
409 benign_errors = []
410 for ee in expected_errors:
411 if ee in errors:
412 errors.remove(ee)
413 benign_errors.append(ee)
414 v.check(
415 '%d unexpected incomparable files' %
416 len(errors),
417 len(errors) == 0)
418 v.check(
419 '(%d of %d expected incomparable files)' %
420 (len(benign_errors),
421 len(expected_errors)),
422 len(benign_errors) == len(expected_errors))
423
424
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425def extract_tarball(
426 v: Verification,
567a6783 427 table: Dict[str, ChannelTableEntry],
7d2c278f 428 dest: str) -> None:
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429 v.status('Extracting tarball %s' % table['nixexprs.tar.xz'].file)
430 shutil.unpack_archive(table['nixexprs.tar.xz'].file, dest)
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431 v.ok()
432
433
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434def git_checkout(
435 v: Verification,
436 channel: TarrableSearchPath,
3258ff2c 437 pin: GitPin,
7d2c278f 438 dest: str) -> None:
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439 v.status('Checking out corresponding git revision')
440 git = subprocess.Popen(['git',
441 '-C',
d06918bc 442 git_cache.git_cachedir(channel.git_repo),
925c801b 443 'archive',
3258ff2c 444 pin.git_revision],
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445 stdout=subprocess.PIPE)
446 tar = subprocess.Popen(
447 ['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout)
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448 if git.stdout:
449 git.stdout.close()
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450 tar.wait()
451 git.wait()
452 v.result(git.returncode == 0 and tar.returncode == 0)
453
454
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455def git_get_tarball(
456 v: Verification,
457 channel: TarrableSearchPath,
458 pin: GitPin) -> str:
b17278e3 459 cache_file = tarball_cache_file(channel, pin)
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460 if os.path.exists(cache_file):
461 cached_tarball = open(cache_file).read(9999)
462 if os.path.exists(cached_tarball):
463 return cached_tarball
464
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465 with tempfile.TemporaryDirectory() as output_dir:
466 output_filename = os.path.join(
9343cf48 467 output_dir, pin.release_name + '.tar.xz')
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468 with open(output_filename, 'w') as output_file:
469 v.status(
470 'Generating tarball for git revision %s' %
9343cf48 471 pin.git_revision)
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472 git = subprocess.Popen(['git',
473 '-C',
d06918bc 474 git_cache.git_cachedir(channel.git_repo),
736c25eb 475 'archive',
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476 '--prefix=%s/' % pin.release_name,
477 pin.git_revision],
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478 stdout=subprocess.PIPE)
479 xz = subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file)
480 xz.wait()
481 git.wait()
482 v.result(git.returncode == 0 and xz.returncode == 0)
483
0afcdb2a 484 store_tarball = copy_to_nix_store(v, output_filename)
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485
486 os.makedirs(os.path.dirname(cache_file), exist_ok=True)
487 open(cache_file, 'w').write(store_tarball)
7c4de64c 488 return store_tarball # type: ignore # (for old mypy)
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489
490
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491def check_channel_metadata(
492 v: Verification,
a72fdca9 493 pin: GitPin,
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494 channel_contents: str) -> None:
495 v.status('Verifying git commit in channel tarball')
496 v.result(
497 open(
498 os.path.join(
499 channel_contents,
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500 pin.release_name,
501 '.git-revision')).read(999) == pin.git_revision)
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502
503 v.status(
504 'Verifying version-suffix is a suffix of release name %s:' %
a72fdca9 505 pin.release_name)
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506 version_suffix = open(
507 os.path.join(
508 channel_contents,
a72fdca9 509 pin.release_name,
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510 '.version-suffix')).read(999)
511 v.status(version_suffix)
a72fdca9 512 v.result(pin.release_name.endswith(version_suffix))
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513
514
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515def check_channel_contents(
516 v: Verification,
a72fdca9 517 channel: TarrableSearchPath,
567a6783 518 table: Dict[str, ChannelTableEntry],
a72fdca9 519 pin: GitPin) -> None:
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520 with tempfile.TemporaryDirectory() as channel_contents, \
521 tempfile.TemporaryDirectory() as git_contents:
925c801b 522
567a6783 523 extract_tarball(v, table, channel_contents)
a72fdca9 524 check_channel_metadata(v, pin, channel_contents)
f9cd7bdc 525
3258ff2c 526 git_checkout(v, channel, pin, git_contents)
925c801b 527
a72fdca9 528 compare_tarball_and_git(v, pin, channel_contents, git_contents)
925c801b 529
dc038df0 530 v.status('Removing temporary directories')
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531 v.ok()
532
533
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534def git_revision_name(
535 v: Verification,
536 channel: TarrableSearchPath,
537 git_revision: str) -> str:
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538 v.status('Getting commit date')
539 process = subprocess.run(['git',
540 '-C',
d06918bc 541 git_cache.git_cachedir(channel.git_repo),
bed32182 542 'log',
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543 '-n1',
544 '--format=%ct-%h',
545 '--abbrev=11',
88af5903 546 '--no-show-signature',
d7cfdb22 547 git_revision],
ba596fc0 548 stdout=subprocess.PIPE)
de68382a 549 v.result(process.returncode == 0 and process.stdout != b'')
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550 return '%s-%s' % (os.path.basename(channel.git_repo),
551 process.stdout.decode().strip())
552
553
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554K = TypeVar('K')
555V = TypeVar('V')
556
557
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558def partition_dict(pred: Callable[[K, V], bool],
559 d: Dict[K, V]) -> Tuple[Dict[K, V], Dict[K, V]]:
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560 selected: Dict[K, V] = {}
561 remaining: Dict[K, V] = {}
562 for k, v in d.items():
9d2c406b 563 if pred(k, v):
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564 selected[k] = v
565 else:
566 remaining[k] = v
567 return selected, remaining
568
569
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570def filter_dict(d: Dict[K, V], fields: Set[K]
571 ) -> Tuple[Dict[K, V], Dict[K, V]]:
572 return partition_dict(lambda k, v: k in fields, d)
573
574
d815b199 575def read_config_section(
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576 conf: configparser.SectionProxy) -> Tuple[SearchPath, Optional[Pin]]:
577 mapping: Mapping[str, Tuple[Type[SearchPath], Type[Pin]]] = {
578 'alias': (AliasSearchPath, AliasPin),
579 'channel': (ChannelSearchPath, ChannelPin),
580 'git': (GitSearchPath, GitPin),
0afcdb2a 581 'symlink': (SymlinkSearchPath, SymlinkPin),
7f4c3ace 582 }
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583 SP, P = mapping[conf['type']]
584 _, all_fields = filter_dict(dict(conf.items()), set(['type']))
585 pin_fields, remaining_fields = filter_dict(all_fields, set(P._fields))
586 # Error suppression works around https://github.com/python/mypy/issues/9007
587 pin_present = pin_fields != {} or P._fields == ()
530104d7 588 pin = P(**pin_fields) if pin_present else None # type: ignore
567a6783 589 return SP(**remaining_fields), pin
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590
591
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592def read_pinned_config_section(
593 section: str, conf: configparser.SectionProxy) -> Tuple[SearchPath, Pin]:
594 sp, pin = read_config_section(conf)
595 if pin is None:
596 raise Exception(
597 'Cannot update unpinned channel "%s" (Run "pin" before "update")' %
598 section)
599 return sp, pin
600
601
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602def read_config(filename: str) -> configparser.ConfigParser:
603 config = configparser.ConfigParser()
604 config.read_file(open(filename), filename)
605 return config
606
607
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608def read_config_files(
609 filenames: Iterable[str]) -> Dict[str, configparser.SectionProxy]:
610 merged_config: Dict[str, configparser.SectionProxy] = {}
611 for file in filenames:
612 config = read_config(file)
613 for section in config.sections():
614 if section in merged_config:
615 raise Exception('Duplicate channel "%s"' % section)
616 merged_config[section] = config[section]
617 return merged_config
618
619
41b87c9c 620def pinCommand(args: argparse.Namespace) -> None:
2f96f32a 621 v = Verification()
01ba0eb2 622 config = read_config(args.channels_file)
5cfa8e11 623 for section in config.sections():
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624 if args.channels and section not in args.channels:
625 continue
736c25eb 626
d815b199 627 sp, old_pin = read_config_section(config[section])
17906b27 628
567a6783 629 config[section].update(sp.pin(v, old_pin)._asdict())
8fca6c28 630
0e5e611d 631 with open(args.channels_file, 'w') as configfile:
e434d96d 632 config.write(configfile)
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633
634
41b87c9c 635def updateCommand(args: argparse.Namespace) -> None:
736c25eb 636 v = Verification()
da135b07 637 exprs: Dict[str, str] = {}
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638 config = {
639 section: read_pinned_config_section(section, conf) for section,
640 conf in read_config_files(
641 args.channels_file).items()}
642 alias, nonalias = partition_dict(
643 lambda k, v: isinstance(v[0], AliasSearchPath), config)
644
645 for section, (sp, pin) in nonalias.items():
646 assert not isinstance(sp, AliasSearchPath) # mypy can't see through
647 assert not isinstance(pin, AliasPin) # partition_dict()
567a6783 648 tarball = sp.fetch(v, pin)
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649 exprs[section] = (
650 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' %
9d2c406b 651 (pin.release_name, tarball))
4603b1a7 652
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653 for section, (sp, pin) in alias.items():
654 assert isinstance(sp, AliasSearchPath) # For mypy
655 exprs[section] = exprs[sp.alias_of]
17906b27 656
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657 command = [
658 'nix-env',
659 '--profile',
9e8ed0ed 660 args.profile,
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661 '--show-trace',
662 '--file',
663 '<nix/unpack-channel.nix>',
664 '--install',
17906b27 665 '--from-expression'] + [exprs[name] % name for name in sorted(exprs.keys())]
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666 if args.dry_run:
667 print(' '.join(map(shlex.quote, command)))
668 else:
669 v.status('Installing channels with nix-env')
670 process = subprocess.run(command)
671 v.result(process.returncode == 0)
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672
673
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674def main() -> None:
675 parser = argparse.ArgumentParser(prog='pinch')
676 subparsers = parser.add_subparsers(dest='mode', required=True)
677 parser_pin = subparsers.add_parser('pin')
678 parser_pin.add_argument('channels_file', type=str)
98853153 679 parser_pin.add_argument('channels', type=str, nargs='*')
41b87c9c 680 parser_pin.set_defaults(func=pinCommand)
736c25eb 681 parser_update = subparsers.add_parser('update')
9a78329e 682 parser_update.add_argument('--dry-run', action='store_true')
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683 parser_update.add_argument('--profile', default=(
684 '/nix/var/nix/profiles/per-user/%s/channels' % getpass.getuser()))
01ba0eb2 685 parser_update.add_argument('channels_file', type=str, nargs='+')
41b87c9c 686 parser_update.set_defaults(func=updateCommand)
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687 args = parser.parse_args()
688 args.func(args)
689
690
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691if __name__ == '__main__':
692 main()