]> git.scottworley.com Git - pinch/blame - pinch.py
fetch_resource is just for Channels
[pinch] / pinch.py
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2fa9cbea 1from abc import ABC, abstractmethod
0e5e611d 2import argparse
f15e458d 3import configparser
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4import filecmp
5import functools
736c25eb 6import getpass
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7import hashlib
8import operator
9import os
10import os.path
9a78329e 11import shlex
2f96f32a 12import shutil
73bec7e8 13import subprocess
9d7844bb 14import sys
2f96f32a 15import tempfile
89e79125 16import types
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17import urllib.parse
18import urllib.request
19import xml.dom.minidom
20
21from typing import (
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22 Dict,
23 Iterable,
24 List,
7f4c3ace 25 Mapping,
0a4ff8dd 26 NamedTuple,
73bec7e8 27 NewType,
2f96f32a 28 Tuple,
7f4c3ace 29 Type,
0a4ff8dd 30 Union,
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31)
32
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33# Use xdg module when it's less painful to have as a dependency
34
35
36class XDG(types.SimpleNamespace):
37 XDG_CACHE_HOME: str
38
39
40xdg = XDG(
41 XDG_CACHE_HOME=os.getenv(
42 'XDG_CACHE_HOME',
43 os.path.expanduser('~/.cache')))
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44
45
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46class VerificationError(Exception):
47 pass
48
49
50class Verification:
51
52 def __init__(self) -> None:
53 self.line_length = 0
54
55 def status(self, s: str) -> None:
9d7844bb 56 print(s, end=' ', file=sys.stderr, flush=True)
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57 self.line_length += 1 + len(s) # Unicode??
58
59 @staticmethod
60 def _color(s: str, c: int) -> str:
61 return '\033[%2dm%s\033[00m' % (c, s)
62
63 def result(self, r: bool) -> None:
64 message, color = {True: ('OK ', 92), False: ('FAIL', 91)}[r]
65 length = len(message)
dd1026fe 66 cols = shutil.get_terminal_size().columns or 80
2f96f32a 67 pad = (cols - (self.line_length + length)) % cols
9d7844bb 68 print(' ' * pad + self._color(message, color), file=sys.stderr)
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69 self.line_length = 0
70 if not r:
71 raise VerificationError()
72
73 def check(self, s: str, r: bool) -> None:
74 self.status(s)
75 self.result(r)
76
77 def ok(self) -> None:
78 self.result(True)
79
80
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81Digest16 = NewType('Digest16', str)
82Digest32 = NewType('Digest32', str)
83
84
85class ChannelTableEntry(types.SimpleNamespace):
86 absolute_url: str
87 digest: Digest16
88 file: str
89 size: int
90 url: str
91
92
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93class AliasPin(NamedTuple):
94 pass
95
96
97class GitPin(NamedTuple):
98 git_revision: str
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99 release_name: str
100
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101
102class ChannelPin(NamedTuple):
103 git_revision: str
104 release_name: str
105 tarball_url: str
106 tarball_sha256: str
107
108
109Pin = Union[AliasPin, GitPin, ChannelPin]
110
111
112class SearchPath(types.SimpleNamespace, ABC):
113
2fa9cbea 114 @abstractmethod
0a4ff8dd 115 def pin(self, v: Verification) -> Pin:
2fa9cbea 116 pass
faff8642 117
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118
119class AliasSearchPath(SearchPath):
faff8642 120 alias_of: str
2fa9cbea 121
0a4ff8dd 122 def pin(self, v: Verification) -> AliasPin:
2fa9cbea 123 assert not hasattr(self, 'git_repo')
0a4ff8dd 124 return AliasPin()
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125
126
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127# (This lint-disable is for pylint bug https://github.com/PyCQA/pylint/issues/179
128# which is fixed in pylint 2.5.)
129class TarrableSearchPath(SearchPath, ABC): # pylint: disable=abstract-method
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130 channel_html: bytes
131 channel_url: str
132 forwarded_url: str
133 git_ref: str
134 git_repo: str
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135 old_git_revision: str
136 table: Dict[str, ChannelTableEntry]
137
138
4a82be40 139class GitSearchPath(TarrableSearchPath):
0a4ff8dd 140 def pin(self, v: Verification) -> GitPin:
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141 if hasattr(self, 'git_revision'):
142 self.old_git_revision = self.git_revision
143 del self.git_revision
144
145 git_fetch(v, self)
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146 return GitPin(release_name=git_revision_name(v, self),
147 git_revision=self.git_revision)
4a82be40 148
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149 def fetch(self, v: Verification, section: str,
150 conf: configparser.SectionProxy) -> str:
151 if 'git_repo' not in conf or 'release_name' not in conf:
152 raise Exception(
153 'Cannot update unpinned channel "%s" (Run "pin" before "update")' %
154 section)
155
156 ensure_git_rev_available(v, self)
157 return git_get_tarball(v, self)
158
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159
160class ChannelSearchPath(TarrableSearchPath):
0a4ff8dd 161 def pin(self, v: Verification) -> ChannelPin:
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162 if hasattr(self, 'git_revision'):
163 self.old_git_revision = self.git_revision
164 del self.git_revision
165
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166 fetch(v, self)
167 parse_channel(v, self)
168 fetch_resources(v, self)
169 ensure_git_rev_available(v, self)
170 check_channel_contents(v, self)
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171 return ChannelPin(
172 release_name=self.release_name,
173 tarball_url=self.table['nixexprs.tar.xz'].absolute_url,
174 tarball_sha256=self.table['nixexprs.tar.xz'].digest,
175 git_revision=self.git_revision)
4a82be40 176
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177 # Lint TODO: Put tarball_url and tarball_sha256 in ChannelSearchPath
178 # pylint: disable=no-self-use
179 def fetch(self, v: Verification, section: str,
180 conf: configparser.SectionProxy) -> str:
181 if 'git_repo' not in conf or 'release_name' not in conf:
182 raise Exception(
183 'Cannot update unpinned channel "%s" (Run "pin" before "update")' %
184 section)
185
186 return fetch_with_nix_prefetch_url(
187 v, conf['tarball_url'], Digest16(
188 conf['tarball_sha256']))
189
4a82be40 190
dc038df0 191def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]:
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192
193 def throw(error: OSError) -> None:
194 raise error
195
196 def join(x: str, y: str) -> str:
197 return y if x == '.' else os.path.join(x, y)
198
199 def recursive_files(d: str) -> Iterable[str]:
200 all_files: List[str] = []
201 for path, dirs, files in os.walk(d, onerror=throw):
202 rel = os.path.relpath(path, start=d)
203 all_files.extend(join(rel, f) for f in files)
204 for dir_or_link in dirs:
205 if os.path.islink(join(path, dir_or_link)):
206 all_files.append(join(rel, dir_or_link))
207 return all_files
208
209 def exclude_dot_git(files: Iterable[str]) -> Iterable[str]:
210 return (f for f in files if not f.startswith('.git/'))
211
212 files = functools.reduce(
213 operator.or_, (set(
214 exclude_dot_git(
215 recursive_files(x))) for x in [a, b]))
216 return filecmp.cmpfiles(a, b, files, shallow=False)
217
218
7d2c278f 219def fetch(v: Verification, channel: TarrableSearchPath) -> None:
2f96f32a 220 v.status('Fetching channel')
b17def3f 221 request = urllib.request.urlopen(channel.channel_url, timeout=10)
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222 channel.channel_html = request.read()
223 channel.forwarded_url = request.geturl()
7c4de64c 224 v.result(request.status == 200) # type: ignore # (for old mypy)
b17def3f 225 v.check('Got forwarded', channel.channel_url != channel.forwarded_url)
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226
227
7d2c278f 228def parse_channel(v: Verification, channel: TarrableSearchPath) -> None:
2f96f32a 229 v.status('Parsing channel description as XML')
72d3478a 230 d = xml.dom.minidom.parseString(channel.channel_html)
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231 v.ok()
232
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233 v.status('Extracting release name:')
234 title_name = d.getElementsByTagName(
235 'title')[0].firstChild.nodeValue.split()[2]
236 h1_name = d.getElementsByTagName('h1')[0].firstChild.nodeValue.split()[2]
237 v.status(title_name)
238 v.result(title_name == h1_name)
72d3478a 239 channel.release_name = title_name
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240
241 v.status('Extracting git commit:')
2f96f32a 242 git_commit_node = d.getElementsByTagName('tt')[0]
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243 channel.git_revision = git_commit_node.firstChild.nodeValue
244 v.status(channel.git_revision)
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245 v.ok()
246 v.status('Verifying git commit label')
247 v.result(git_commit_node.previousSibling.nodeValue == 'Git commit ')
248
249 v.status('Parsing table')
72d3478a 250 channel.table = {}
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251 for row in d.getElementsByTagName('tr')[1:]:
252 name = row.childNodes[0].firstChild.firstChild.nodeValue
253 url = row.childNodes[0].firstChild.getAttribute('href')
254 size = int(row.childNodes[1].firstChild.nodeValue)
73bec7e8 255 digest = Digest16(row.childNodes[2].firstChild.firstChild.nodeValue)
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256 channel.table[name] = ChannelTableEntry(
257 url=url, digest=digest, size=size)
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258 v.ok()
259
260
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261def digest_string(s: bytes) -> Digest16:
262 return Digest16(hashlib.sha256(s).hexdigest())
263
264
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265def digest_file(filename: str) -> Digest16:
266 hasher = hashlib.sha256()
267 with open(filename, 'rb') as f:
268 # pylint: disable=cell-var-from-loop
269 for block in iter(lambda: f.read(4096), b''):
270 hasher.update(block)
271 return Digest16(hasher.hexdigest())
272
273
274def to_Digest16(v: Verification, digest32: Digest32) -> Digest16:
275 v.status('Converting digest to base16')
276 process = subprocess.run(
ba596fc0 277 ['nix', 'to-base16', '--type', 'sha256', digest32], stdout=subprocess.PIPE)
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278 v.result(process.returncode == 0)
279 return Digest16(process.stdout.decode().strip())
280
281
282def to_Digest32(v: Verification, digest16: Digest16) -> Digest32:
283 v.status('Converting digest to base32')
284 process = subprocess.run(
ba596fc0 285 ['nix', 'to-base32', '--type', 'sha256', digest16], stdout=subprocess.PIPE)
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286 v.result(process.returncode == 0)
287 return Digest32(process.stdout.decode().strip())
288
289
290def fetch_with_nix_prefetch_url(
291 v: Verification,
292 url: str,
293 digest: Digest16) -> str:
294 v.status('Fetching %s' % url)
295 process = subprocess.run(
ba596fc0 296 ['nix-prefetch-url', '--print-path', url, digest], stdout=subprocess.PIPE)
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297 v.result(process.returncode == 0)
298 prefetch_digest, path, empty = process.stdout.decode().split('\n')
299 assert empty == ''
300 v.check("Verifying nix-prefetch-url's digest",
301 to_Digest16(v, Digest32(prefetch_digest)) == digest)
302 v.status("Verifying file digest")
303 file_digest = digest_file(path)
304 v.result(file_digest == digest)
7c4de64c 305 return path # type: ignore # (for old mypy)
2f96f32a 306
73bec7e8 307
4aaa88e0 308def fetch_resources(v: Verification, channel: ChannelSearchPath) -> None:
2f96f32a 309 for resource in ['git-revision', 'nixexprs.tar.xz']:
72d3478a 310 fields = channel.table[resource]
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311 fields.absolute_url = urllib.parse.urljoin(
312 channel.forwarded_url, fields.url)
313 fields.file = fetch_with_nix_prefetch_url(
314 v, fields.absolute_url, fields.digest)
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315 v.status('Verifying git commit on main page matches git commit in table')
316 v.result(
317 open(
61aaf799 318 channel.table['git-revision'].file).read(999) == channel.git_revision)
2f96f32a 319
971d3659 320
9836141c 321def git_cachedir(git_repo: str) -> str:
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322 return os.path.join(
323 xdg.XDG_CACHE_HOME,
324 'pinch/git',
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325 digest_string(git_repo.encode()))
326
327
7d2c278f 328def tarball_cache_file(channel: TarrableSearchPath) -> str:
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329 return os.path.join(
330 xdg.XDG_CACHE_HOME,
331 'pinch/git-tarball',
332 '%s-%s-%s' %
333 (digest_string(channel.git_repo.encode()),
334 channel.git_revision,
335 channel.release_name))
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336
337
7d2c278f 338def verify_git_ancestry(v: Verification, channel: TarrableSearchPath) -> None:
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339 cachedir = git_cachedir(channel.git_repo)
340 v.status('Verifying rev is an ancestor of ref')
341 process = subprocess.run(['git',
342 '-C',
343 cachedir,
344 'merge-base',
345 '--is-ancestor',
346 channel.git_revision,
347 channel.git_ref])
348 v.result(process.returncode == 0)
349
350 if hasattr(channel, 'old_git_revision'):
351 v.status(
352 'Verifying rev is an ancestor of previous rev %s' %
353 channel.old_git_revision)
354 process = subprocess.run(['git',
355 '-C',
356 cachedir,
357 'merge-base',
358 '--is-ancestor',
359 channel.old_git_revision,
360 channel.git_revision])
361 v.result(process.returncode == 0)
9836141c 362
2f96f32a 363
7d2c278f 364def git_fetch(v: Verification, channel: TarrableSearchPath) -> None:
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365 # It would be nice if we could share the nix git cache, but as of the time
366 # of writing it is transitioning from gitv2 (deprecated) to gitv3 (not ready
367 # yet), and trying to straddle them both is too far into nix implementation
368 # details for my comfort. So we re-implement here half of nix.fetchGit.
369 # :(
370
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371 cachedir = git_cachedir(channel.git_repo)
372 if not os.path.exists(cachedir):
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373 v.status("Initializing git repo")
374 process = subprocess.run(
9836141c 375 ['git', 'init', '--bare', cachedir])
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376 v.result(process.returncode == 0)
377
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378 v.status('Fetching ref "%s" from %s' % (channel.git_ref, channel.git_repo))
379 # We don't use --force here because we want to abort and freak out if forced
380 # updates are happening.
381 process = subprocess.run(['git',
382 '-C',
383 cachedir,
384 'fetch',
385 channel.git_repo,
386 '%s:%s' % (channel.git_ref,
387 channel.git_ref)])
388 v.result(process.returncode == 0)
389
8fca6c28 390 if hasattr(channel, 'git_revision'):
971d3659 391 v.status('Verifying that fetch retrieved this rev')
8fca6c28 392 process = subprocess.run(
9836141c 393 ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision])
dc038df0 394 v.result(process.returncode == 0)
971d3659 395 else:
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396 channel.git_revision = open(
397 os.path.join(
9836141c 398 cachedir,
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399 'refs',
400 'heads',
401 channel.git_ref)).read(999).strip()
dc038df0 402
971d3659 403 verify_git_ancestry(v, channel)
dc038df0 404
971d3659 405
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406def ensure_git_rev_available(
407 v: Verification,
408 channel: TarrableSearchPath) -> None:
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409 cachedir = git_cachedir(channel.git_repo)
410 if os.path.exists(cachedir):
411 v.status('Checking if we already have this rev:')
412 process = subprocess.run(
413 ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision])
414 if process.returncode == 0:
415 v.status('yes')
416 if process.returncode == 1:
417 v.status('no')
418 v.result(process.returncode == 0 or process.returncode == 1)
419 if process.returncode == 0:
420 verify_git_ancestry(v, channel)
421 return
422 git_fetch(v, channel)
7d889b12 423
dc038df0 424
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425def compare_tarball_and_git(
426 v: Verification,
7d2c278f 427 channel: TarrableSearchPath,
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428 channel_contents: str,
429 git_contents: str) -> None:
430 v.status('Comparing channel tarball with git checkout')
431 match, mismatch, errors = compare(os.path.join(
432 channel_contents, channel.release_name), git_contents)
433 v.ok()
434 v.check('%d files match' % len(match), len(match) > 0)
435 v.check('%d files differ' % len(mismatch), len(mismatch) == 0)
436 expected_errors = [
437 '.git-revision',
438 '.version-suffix',
439 'nixpkgs',
440 'programs.sqlite',
441 'svn-revision']
442 benign_errors = []
443 for ee in expected_errors:
444 if ee in errors:
445 errors.remove(ee)
446 benign_errors.append(ee)
447 v.check(
448 '%d unexpected incomparable files' %
449 len(errors),
450 len(errors) == 0)
451 v.check(
452 '(%d of %d expected incomparable files)' %
453 (len(benign_errors),
454 len(expected_errors)),
455 len(benign_errors) == len(expected_errors))
456
457
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458def extract_tarball(
459 v: Verification,
460 channel: TarrableSearchPath,
461 dest: str) -> None:
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462 v.status('Extracting tarball %s' %
463 channel.table['nixexprs.tar.xz'].file)
464 shutil.unpack_archive(
465 channel.table['nixexprs.tar.xz'].file,
466 dest)
467 v.ok()
468
469
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470def git_checkout(
471 v: Verification,
472 channel: TarrableSearchPath,
473 dest: str) -> None:
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474 v.status('Checking out corresponding git revision')
475 git = subprocess.Popen(['git',
476 '-C',
9836141c 477 git_cachedir(channel.git_repo),
925c801b 478 'archive',
61aaf799 479 channel.git_revision],
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480 stdout=subprocess.PIPE)
481 tar = subprocess.Popen(
482 ['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout)
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483 if git.stdout:
484 git.stdout.close()
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485 tar.wait()
486 git.wait()
487 v.result(git.returncode == 0 and tar.returncode == 0)
488
489
7d2c278f 490def git_get_tarball(v: Verification, channel: TarrableSearchPath) -> str:
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491 cache_file = tarball_cache_file(channel)
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
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497 with tempfile.TemporaryDirectory() as output_dir:
498 output_filename = os.path.join(
499 output_dir, channel.release_name + '.tar.xz')
500 with open(output_filename, 'w') as output_file:
501 v.status(
502 'Generating tarball for git revision %s' %
503 channel.git_revision)
504 git = subprocess.Popen(['git',
505 '-C',
506 git_cachedir(channel.git_repo),
507 'archive',
508 '--prefix=%s/' % channel.release_name,
509 channel.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(
ba596fc0 518 ['nix-store', '--add', output_filename], stdout=subprocess.PIPE)
736c25eb 519 v.result(process.returncode == 0)
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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)
7c4de64c 524 return store_tarball # type: ignore # (for old mypy)
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525
526
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527def check_channel_metadata(
528 v: Verification,
7d2c278f 529 channel: TarrableSearchPath,
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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 channel.release_name,
61aaf799 537 '.git-revision')).read(999) == channel.git_revision)
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538
539 v.status(
540 'Verifying version-suffix is a suffix of release name %s:' %
541 channel.release_name)
542 version_suffix = open(
543 os.path.join(
544 channel_contents,
545 channel.release_name,
546 '.version-suffix')).read(999)
547 v.status(version_suffix)
548 v.result(channel.release_name.endswith(version_suffix))
549
550
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551def check_channel_contents(
552 v: Verification,
553 channel: TarrableSearchPath) -> None:
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554 with tempfile.TemporaryDirectory() as channel_contents, \
555 tempfile.TemporaryDirectory() as git_contents:
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556
557 extract_tarball(v, channel, channel_contents)
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558 check_channel_metadata(v, channel, channel_contents)
559
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560 git_checkout(v, channel, git_contents)
561
562 compare_tarball_and_git(v, channel, channel_contents, git_contents)
563
dc038df0 564 v.status('Removing temporary directories')
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565 v.ok()
566
567
7d2c278f 568def git_revision_name(v: Verification, channel: TarrableSearchPath) -> str:
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569 v.status('Getting commit date')
570 process = subprocess.run(['git',
571 '-C',
9836141c 572 git_cachedir(channel.git_repo),
bed32182 573 'log',
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574 '-n1',
575 '--format=%ct-%h',
576 '--abbrev=11',
88af5903 577 '--no-show-signature',
e3cae769 578 channel.git_revision],
ba596fc0 579 stdout=subprocess.PIPE)
de68382a 580 v.result(process.returncode == 0 and process.stdout != b'')
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581 return '%s-%s' % (os.path.basename(channel.git_repo),
582 process.stdout.decode().strip())
583
584
411b705e 585def read_search_path(conf: configparser.SectionProxy) -> SearchPath:
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586 mapping: Mapping[str, Type[SearchPath]] = {
587 'alias': AliasSearchPath,
588 'channel': ChannelSearchPath,
589 'git': GitSearchPath,
590 }
591 return mapping[conf['type']](**dict(conf.items()))
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592
593
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594def read_config(filename: str) -> configparser.ConfigParser:
595 config = configparser.ConfigParser()
596 config.read_file(open(filename), filename)
597 return config
598
599
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600def read_config_files(
601 filenames: Iterable[str]) -> Dict[str, configparser.SectionProxy]:
602 merged_config: Dict[str, configparser.SectionProxy] = {}
603 for file in filenames:
604 config = read_config(file)
605 for section in config.sections():
606 if section in merged_config:
607 raise Exception('Duplicate channel "%s"' % section)
608 merged_config[section] = config[section]
609 return merged_config
610
611
0e5e611d 612def pin(args: argparse.Namespace) -> None:
2f96f32a 613 v = Verification()
01ba0eb2 614 config = read_config(args.channels_file)
5cfa8e11 615 for section in config.sections():
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616 if args.channels and section not in args.channels:
617 continue
736c25eb 618
411b705e 619 sp = read_search_path(config[section])
17906b27 620
0a4ff8dd 621 config[section].update(sp.pin(v)._asdict())
8fca6c28 622
0e5e611d 623 with open(args.channels_file, 'w') as configfile:
e434d96d 624 config.write(configfile)
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625
626
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627def update(args: argparse.Namespace) -> None:
628 v = Verification()
da135b07 629 exprs: Dict[str, str] = {}
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630 config = read_config_files(args.channels_file)
631 for section in config:
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632 sp = read_search_path(config[section])
633 if isinstance(sp, AliasSearchPath):
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634 assert 'git_repo' not in config[section]
635 continue
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636 tarball = sp.fetch(v, section, config[section])
637 exprs[section] = (
638 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' %
639 (config[section]['release_name'], tarball))
640
641 for section in config:
642 if 'alias_of' in config[section]:
643 exprs[section] = exprs[str(config[section]['alias_of'])]
17906b27 644
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645 command = [
646 'nix-env',
647 '--profile',
648 '/nix/var/nix/profiles/per-user/%s/channels' %
649 getpass.getuser(),
650 '--show-trace',
651 '--file',
652 '<nix/unpack-channel.nix>',
653 '--install',
17906b27 654 '--from-expression'] + [exprs[name] % name for name in sorted(exprs.keys())]
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655 if args.dry_run:
656 print(' '.join(map(shlex.quote, command)))
657 else:
658 v.status('Installing channels with nix-env')
659 process = subprocess.run(command)
660 v.result(process.returncode == 0)
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661
662
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663def main() -> None:
664 parser = argparse.ArgumentParser(prog='pinch')
665 subparsers = parser.add_subparsers(dest='mode', required=True)
666 parser_pin = subparsers.add_parser('pin')
667 parser_pin.add_argument('channels_file', type=str)
98853153 668 parser_pin.add_argument('channels', type=str, nargs='*')
0e5e611d 669 parser_pin.set_defaults(func=pin)
736c25eb 670 parser_update = subparsers.add_parser('update')
9a78329e 671 parser_update.add_argument('--dry-run', action='store_true')
01ba0eb2 672 parser_update.add_argument('channels_file', type=str, nargs='+')
736c25eb 673 parser_update.set_defaults(func=update)
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674 args = parser.parse_args()
675 args.func(args)
676
677
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678if __name__ == '__main__':
679 main()