contrib/remote-helpers/git-remote-bzr

   1 #!/usr/bin/env python
   2 #
   3 # Copyright (c) 2012 Felipe Contreras
   4 #
   5
   6 #
   7 # Just copy to your ~/bin, or anywhere in your $PATH.
   8 # Then you can clone with:
   9 # % git clone bzr::/path/to/bzr/repo/or/url
  10 #
  11 # For example:
  12 # % git clone bzr::$HOME/myrepo
  13 # or
  14 # % git clone bzr::lp:myrepo
  15 #
  16
  17 import sys
  18
  19 import bzrlib
  20 if hasattr(bzrlib, "initialize"):
  21     bzrlib.initialize()
  22
  23 import bzrlib.plugin
  24 bzrlib.plugin.load_plugins()
  25
  26 import bzrlib.generate_ids
  27 import bzrlib.transport
  28 import bzrlib.errors
  29
  30 import sys
  31 import os
  32 import json
  33 import re
  34 import StringIO
  35
  36 NAME_RE = re.compile('^([^<>]+)')
  37 AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  38 RAW_AUTHOR_RE = re.compile('^(\w+) (.+)? <(.*)> (\d+) ([+-]\d+)')
  39
  40 def die(msg, *args):
  41     sys.stderr.write('ERROR: %s\n' % (msg % args))
  42     sys.exit(1)
  43
  44 def warn(msg, *args):
  45     sys.stderr.write('WARNING: %s\n' % (msg % args))
  46
  47 def gittz(tz):
  48     return '%+03d%02d' % (tz / 3600, tz % 3600 / 60)
  49
  50 class Marks:
  51
  52     def __init__(self, path):
  53         self.path = path
  54         self.tips = {}
  55         self.marks = {}
  56         self.rev_marks = {}
  57         self.last_mark = 0
  58         self.load()
  59
  60     def load(self):
  61         if not os.path.exists(self.path):
  62             return
  63
  64         tmp = json.load(open(self.path))
  65         self.tips = tmp['tips']
  66         self.marks = tmp['marks']
  67         self.last_mark = tmp['last-mark']
  68
  69         for rev, mark in self.marks.iteritems():
  70             self.rev_marks[mark] = rev
  71
  72     def dict(self):
  73         return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
  74
  75     def store(self):
  76         json.dump(self.dict(), open(self.path, 'w'))
  77
  78     def __str__(self):
  79         return str(self.dict())
  80
  81     def from_rev(self, rev):
  82         return self.marks[rev]
  83
  84     def to_rev(self, mark):
  85         return self.rev_marks[mark]
  86
  87     def next_mark(self):
  88         self.last_mark += 1
  89         return self.last_mark
  90
  91     def get_mark(self, rev):
  92         self.last_mark += 1
  93         self.marks[rev] = self.last_mark
  94         return self.last_mark
  95
  96     def is_marked(self, rev):
  97         return str(rev) in self.marks
  98
  99     def new_mark(self, rev, mark):
 100         self.marks[rev] = mark
 101         self.rev_marks[mark] = rev
 102         self.last_mark = mark
 103
 104     def get_tip(self, branch):
 105         return self.tips.get(branch, None)
 106
 107     def set_tip(self, branch, tip):
 108         self.tips[branch] = tip
 109
 110 class Parser:
 111
 112     def __init__(self, repo):
 113         self.repo = repo
 114         self.line = self.get_line()
 115
 116     def get_line(self):
 117         return sys.stdin.readline().strip()
 118
 119     def __getitem__(self, i):
 120         return self.line.split()[i]
 121
 122     def check(self, word):
 123         return self.line.startswith(word)
 124
 125     def each_block(self, separator):
 126         while self.line != separator:
 127             yield self.line
 128             self.line = self.get_line()
 129
 130     def __iter__(self):
 131         return self.each_block('')
 132
 133     def next(self):
 134         self.line = self.get_line()
 135         if self.line == 'done':
 136             self.line = None
 137
 138     def get_mark(self):
 139         i = self.line.index(':') + 1
 140         return int(self.line[i:])
 141
 142     def get_data(self):
 143         if not self.check('data'):
 144             return None
 145         i = self.line.index(' ') + 1
 146         size = int(self.line[i:])
 147         return sys.stdin.read(size)
 148
 149     def get_author(self):
 150         m = RAW_AUTHOR_RE.match(self.line)
 151         if not m:
 152             return None
 153         _, name, email, date, tz = m.groups()
 154         committer = '%s <%s>' % (name, email)
 155         tz = int(tz)
 156         tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 157         return (committer, int(date), tz)
 158
 159 def rev_to_mark(rev):
 160     global marks
 161     return marks.from_rev(rev)
 162
 163 def mark_to_rev(mark):
 164     global marks
 165     return marks.to_rev(mark)
 166
 167 def fixup_user(user):
 168     name = mail = None
 169     user = user.replace('"', '')
 170     m = AUTHOR_RE.match(user)
 171     if m:
 172         name = m.group(1)
 173         mail = m.group(2).strip()
 174     else:
 175         m = NAME_RE.match(user)
 176         if m:
 177             name = m.group(1).strip()
 178
 179     return '%s <%s>' % (name, mail)
 180
 181 def get_filechanges(cur, prev):
 182     modified = {}
 183     removed = {}
 184
 185     changes = cur.changes_from(prev)
 186
 187     def u(s):
 188         return s.encode('utf-8')
 189
 190     for path, fid, kind in changes.added:
 191         modified[u(path)] = fid
 192     for path, fid, kind in changes.removed:
 193         removed[u(path)] = None
 194     for path, fid, kind, mod, _ in changes.modified:
 195         modified[u(path)] = fid
 196     for oldpath, newpath, fid, kind, mod, _ in changes.renamed:
 197         removed[u(oldpath)] = None
 198         if kind == 'directory':
 199             lst = cur.list_files(from_dir=newpath, recursive=True)
 200             for path, file_class, kind, fid, entry in lst:
 201                 if kind != 'directory':
 202                     modified[u(newpath + '/' + path)] = fid
 203         else:
 204             modified[u(newpath)] = fid
 205
 206     return modified, removed
 207
 208 def export_files(tree, files):
 209     global marks, filenodes
 210
 211     final = []
 212     for path, fid in files.iteritems():
 213         kind = tree.kind(fid)
 214
 215         h = tree.get_file_sha1(fid)
 216
 217         if kind == 'symlink':
 218             d = tree.get_symlink_target(fid)
 219             mode = '120000'
 220         elif kind == 'file':
 221
 222             if tree.is_executable(fid):
 223                 mode = '100755'
 224             else:
 225                 mode = '100644'
 226
 227             # is the blog already exported?
 228             if h in filenodes:
 229                 mark = filenodes[h]
 230                 final.append((mode, mark, path))
 231                 continue
 232
 233             d = tree.get_file_text(fid)
 234         elif kind == 'directory':
 235             continue
 236         else:
 237             die("Unhandled kind '%s' for path '%s'" % (kind, path))
 238
 239         mark = marks.next_mark()
 240         filenodes[h] = mark
 241
 242         print "blob"
 243         print "mark :%u" % mark
 244         print "data %d" % len(d)
 245         print d
 246
 247         final.append((mode, mark, path))
 248
 249     return final
 250
 251 def export_branch(branch, name):
 252     global prefix
 253
 254     ref = '%s/heads/%s' % (prefix, name)
 255     tip = marks.get_tip(name)
 256
 257     repo = branch.repository
 258     repo.lock_read()
 259     revs = branch.iter_merge_sorted_revisions(None, tip, 'exclude', 'forward')
 260     count = 0
 261
 262     revs = [revid for revid, _, _, _ in revs if not marks.is_marked(revid)]
 263
 264     for revid in revs:
 265
 266         rev = repo.get_revision(revid)
 267
 268         parents = rev.parent_ids
 269         time = rev.timestamp
 270         tz = rev.timezone
 271         committer = rev.committer.encode('utf-8')
 272         committer = "%s %u %s" % (fixup_user(committer), time, gittz(tz))
 273         authors = rev.get_apparent_authors()
 274         if authors:
 275             author = authors[0].encode('utf-8')
 276             author = "%s %u %s" % (fixup_user(author), time, gittz(tz))
 277         else:
 278             author = committer
 279         msg = rev.message.encode('utf-8')
 280
 281         msg += '\n'
 282
 283         if len(parents) == 0:
 284             parent = bzrlib.revision.NULL_REVISION
 285         else:
 286             parent = parents[0]
 287
 288         cur_tree = repo.revision_tree(revid)
 289         prev = repo.revision_tree(parent)
 290         modified, removed = get_filechanges(cur_tree, prev)
 291
 292         modified_final = export_files(cur_tree, modified)
 293
 294         if len(parents) == 0:
 295             print 'reset %s' % ref
 296
 297         print "commit %s" % ref
 298         print "mark :%d" % (marks.get_mark(revid))
 299         print "author %s" % (author)
 300         print "committer %s" % (committer)
 301         print "data %d" % (len(msg))
 302         print msg
 303
 304         for i, p in enumerate(parents):
 305             try:
 306                 m = rev_to_mark(p)
 307             except KeyError:
 308                 # ghost?
 309                 continue
 310             if i == 0:
 311                 print "from :%s" % m
 312             else:
 313                 print "merge :%s" % m
 314
 315         for f in removed:
 316             print "D %s" % (f,)
 317         for f in modified_final:
 318             print "M %s :%u %s" % f
 319         print
 320
 321         count += 1
 322         if (count % 100 == 0):
 323             print "progress revision %s (%d/%d)" % (revid, count, len(revs))
 324             print "#############################################################"
 325
 326     repo.unlock()
 327
 328     revid = branch.last_revision()
 329
 330     # make sure the ref is updated
 331     print "reset %s" % ref
 332     print "from :%u" % rev_to_mark(revid)
 333     print
 334
 335     marks.set_tip(name, revid)
 336
 337 def export_tag(repo, name):
 338     global tags, prefix
 339
 340     ref = '%s/tags/%s' % (prefix, name)
 341     print "reset %s" % ref
 342     print "from :%u" % rev_to_mark(tags[name])
 343     print
 344
 345 def do_import(parser):
 346     global dirname
 347
 348     branch = parser.repo
 349     path = os.path.join(dirname, 'marks-git')
 350
 351     print "feature done"
 352     if os.path.exists(path):
 353         print "feature import-marks=%s" % path
 354     print "feature export-marks=%s" % path
 355     sys.stdout.flush()
 356
 357     while parser.check('import'):
 358         ref = parser[1]
 359         if ref.startswith('refs/heads/'):
 360             name = ref[len('refs/heads/'):]
 361             export_branch(branch, name)
 362         if ref.startswith('refs/tags/'):
 363             name = ref[len('refs/tags/'):]
 364             export_tag(branch, name)
 365         parser.next()
 366
 367     print 'done'
 368
 369     sys.stdout.flush()
 370
 371 def parse_blob(parser):
 372     global blob_marks
 373
 374     parser.next()
 375     mark = parser.get_mark()
 376     parser.next()
 377     data = parser.get_data()
 378     blob_marks[mark] = data
 379     parser.next()
 380
 381 class CustomTree():
 382
 383     def __init__(self, repo, revid, parents, files):
 384         global files_cache
 385
 386         self.repo = repo
 387         self.revid = revid
 388         self.parents = parents
 389         self.updates = {}
 390
 391         def copy_tree(revid):
 392             files = files_cache[revid] = {}
 393             tree = repo.repository.revision_tree(revid)
 394             repo.lock_read()
 395             try:
 396                 for path, entry in tree.iter_entries_by_dir():
 397                     files[path] = entry.file_id
 398             finally:
 399                 repo.unlock()
 400             return files
 401
 402         if len(parents) == 0:
 403             self.base_id = bzrlib.revision.NULL_REVISION
 404             self.base_files = {}
 405         else:
 406             self.base_id = parents[0]
 407             self.base_files = files_cache.get(self.base_id, None)
 408             if not self.base_files:
 409                 self.base_files = copy_tree(self.base_id)
 410
 411         self.files = files_cache[revid] = self.base_files.copy()
 412
 413         for path, f in files.iteritems():
 414             fid = self.files.get(path, None)
 415             if not fid:
 416                 fid = bzrlib.generate_ids.gen_file_id(path)
 417             f['path'] = path
 418             self.updates[fid] = f
 419
 420     def last_revision(self):
 421         return self.base_id
 422
 423     def iter_changes(self):
 424         changes = []
 425
 426         def get_parent(dirname, basename):
 427             parent_fid = self.base_files.get(dirname, None)
 428             if parent_fid:
 429                 return parent_fid
 430             parent_fid = self.files.get(dirname, None)
 431             if parent_fid:
 432                 return parent_fid
 433             if basename == '':
 434                 return None
 435             fid = bzrlib.generate_ids.gen_file_id(path)
 436             d = add_entry(fid, dirname, 'directory')
 437             return fid
 438
 439         def add_entry(fid, path, kind, mode = None):
 440             dirname, basename = os.path.split(path)
 441             parent_fid = get_parent(dirname, basename)
 442
 443             executable = False
 444             if mode == '100755':
 445                 executable = True
 446             elif mode == '120000':
 447                 kind = 'symlink'
 448
 449             change = (fid,
 450                     (None, path),
 451                     True,
 452                     (False, True),
 453                     (None, parent_fid),
 454                     (None, basename),
 455                     (None, kind),
 456                     (None, executable))
 457             self.files[path] = change[0]
 458             changes.append(change)
 459             return change
 460
 461         def update_entry(fid, path, kind, mode = None):
 462             dirname, basename = os.path.split(path)
 463             parent_fid = get_parent(dirname, basename)
 464
 465             executable = False
 466             if mode == '100755':
 467                 executable = True
 468             elif mode == '120000':
 469                 kind = 'symlink'
 470
 471             change = (fid,
 472                     (path, path),
 473                     True,
 474                     (True, True),
 475                     (None, parent_fid),
 476                     (None, basename),
 477                     (None, kind),
 478                     (None, executable))
 479             self.files[path] = change[0]
 480             changes.append(change)
 481             return change
 482
 483         def remove_entry(fid, path, kind):
 484             dirname, basename = os.path.split(path)
 485             parent_fid = get_parent(dirname, basename)
 486             change = (fid,
 487                     (path, None),
 488                     True,
 489                     (True, False),
 490                     (parent_fid, None),
 491                     (None, None),
 492                     (None, None),
 493                     (None, None))
 494             del self.files[path]
 495             changes.append(change)
 496             return change
 497
 498         for fid, f in self.updates.iteritems():
 499             path = f['path']
 500
 501             if 'deleted' in f:
 502                 remove_entry(fid, path, 'file')
 503                 continue
 504
 505             if path in self.base_files:
 506                 update_entry(fid, path, 'file', f['mode'])
 507             else:
 508                 add_entry(fid, path, 'file', f['mode'])
 509
 510         return changes
 511
 512     def get_file_with_stat(self, file_id, path=None):
 513         return (StringIO.StringIO(self.updates[file_id]['data']), None)
 514
 515     def get_symlink_target(self, file_id):
 516         return self.updates[file_id]['data']
 517
 518 def c_style_unescape(string):
 519     if string[0] == string[-1] == '"':
 520         return string.decode('string-escape')[1:-1]
 521     return string
 522
 523 def parse_commit(parser):
 524     global marks, blob_marks, bmarks, parsed_refs
 525     global mode
 526
 527     parents = []
 528
 529     ref = parser[1]
 530     parser.next()
 531
 532     if ref != 'refs/heads/master':
 533         die("bzr doesn't support multiple branches; use 'master'")
 534
 535     commit_mark = parser.get_mark()
 536     parser.next()
 537     author = parser.get_author()
 538     parser.next()
 539     committer = parser.get_author()
 540     parser.next()
 541     data = parser.get_data()
 542     parser.next()
 543     if parser.check('from'):
 544         parents.append(parser.get_mark())
 545         parser.next()
 546     while parser.check('merge'):
 547         parents.append(parser.get_mark())
 548         parser.next()
 549
 550     files = {}
 551
 552     for line in parser:
 553         if parser.check('M'):
 554             t, m, mark_ref, path = line.split(' ', 3)
 555             mark = int(mark_ref[1:])
 556             f = { 'mode' : m, 'data' : blob_marks[mark] }
 557         elif parser.check('D'):
 558             t, path = line.split(' ')
 559             f = { 'deleted' : True }
 560         else:
 561             die('Unknown file command: %s' % line)
 562         path = c_style_unescape(path).decode('utf-8')
 563         files[path] = f
 564
 565     repo = parser.repo
 566
 567     committer, date, tz = committer
 568     parents = [str(mark_to_rev(p)) for p in parents]
 569     revid = bzrlib.generate_ids.gen_revision_id(committer, date)
 570     props = {}
 571     props['branch-nick'] = repo.nick
 572
 573     mtree = CustomTree(repo, revid, parents, files)
 574     changes = mtree.iter_changes()
 575
 576     repo.lock_write()
 577     try:
 578         builder = repo.get_commit_builder(parents, None, date, tz, committer, props, revid)
 579         try:
 580             list(builder.record_iter_changes(mtree, mtree.last_revision(), changes))
 581             builder.finish_inventory()
 582             builder.commit(data.decode('utf-8', 'replace'))
 583         except Exception, e:
 584             builder.abort()
 585             raise
 586     finally:
 587         repo.unlock()
 588
 589     parsed_refs[ref] = revid
 590     marks.new_mark(revid, commit_mark)
 591
 592 def parse_reset(parser):
 593     global parsed_refs
 594
 595     ref = parser[1]
 596     parser.next()
 597
 598     if ref != 'refs/heads/master':
 599         die("bzr doesn't support multiple branches; use 'master'")
 600
 601     # ugh
 602     if parser.check('commit'):
 603         parse_commit(parser)
 604         return
 605     if not parser.check('from'):
 606         return
 607     from_mark = parser.get_mark()
 608     parser.next()
 609
 610     parsed_refs[ref] = mark_to_rev(from_mark)
 611
 612 def do_export(parser):
 613     global parsed_refs, dirname, peer
 614
 615     parser.next()
 616
 617     for line in parser.each_block('done'):
 618         if parser.check('blob'):
 619             parse_blob(parser)
 620         elif parser.check('commit'):
 621             parse_commit(parser)
 622         elif parser.check('reset'):
 623             parse_reset(parser)
 624         elif parser.check('tag'):
 625             pass
 626         elif parser.check('feature'):
 627             pass
 628         else:
 629             die('unhandled export command: %s' % line)
 630
 631     repo = parser.repo
 632
 633     for ref, revid in parsed_refs.iteritems():
 634         if ref == 'refs/heads/master':
 635             repo.generate_revision_history(revid, marks.get_tip('master'))
 636             if peer:
 637                 try:
 638                     repo.push(peer, stop_revision=revid)
 639                 except bzrlib.errors.DivergedBranches:
 640                     print "error %s non-fast forward" % ref
 641                     continue
 642             else:
 643                 wt = repo.bzrdir.open_workingtree()
 644                 wt.update()
 645         print "ok %s" % ref
 646     print
 647
 648 def do_capabilities(parser):
 649     global dirname
 650
 651     print "import"
 652     print "export"
 653     print "refspec refs/heads/*:%s/heads/*" % prefix
 654     print "refspec refs/tags/*:%s/tags/*" % prefix
 655
 656     path = os.path.join(dirname, 'marks-git')
 657
 658     if os.path.exists(path):
 659         print "*import-marks %s" % path
 660     print "*export-marks %s" % path
 661
 662     print
 663
 664 def ref_is_valid(name):
 665     return not True in [c in name for c in '~^: \\']
 666
 667 def do_list(parser):
 668     global tags
 669     print "? refs/heads/%s" % 'master'
 670
 671     branch = parser.repo
 672     branch.lock_read()
 673     for tag, revid in branch.tags.get_tag_dict().items():
 674         try:
 675             branch.revision_id_to_dotted_revno(revid)
 676         except bzrlib.errors.NoSuchRevision:
 677             continue
 678         if not ref_is_valid(tag):
 679             continue
 680         print "? refs/tags/%s" % tag
 681         tags[tag] = revid
 682     branch.unlock()
 683     print "@refs/heads/%s HEAD" % 'master'
 684     print
 685
 686 def get_repo(url, alias):
 687     global dirname, peer
 688
 689     origin = bzrlib.bzrdir.BzrDir.open(url)
 690     branch = origin.open_branch()
 691
 692     if not isinstance(origin.transport, bzrlib.transport.local.LocalTransport):
 693         clone_path = os.path.join(dirname, 'clone')
 694         remote_branch = branch
 695         if os.path.exists(clone_path):
 696             # pull
 697             d = bzrlib.bzrdir.BzrDir.open(clone_path)
 698             branch = d.open_branch()
 699             result = branch.pull(remote_branch, [], None, False)
 700         else:
 701             # clone
 702             d = origin.sprout(clone_path, None,
 703                     hardlink=True, create_tree_if_local=False,
 704                     source_branch=remote_branch)
 705             branch = d.open_branch()
 706             branch.bind(remote_branch)
 707
 708         peer = remote_branch
 709     else:
 710         peer = None
 711
 712     return branch
 713
 714 def main(args):
 715     global marks, prefix, dirname
 716     global tags, filenodes
 717     global blob_marks
 718     global parsed_refs
 719     global files_cache
 720
 721     alias = args[1]
 722     url = args[2]
 723
 724     prefix = 'refs/bzr/%s' % alias
 725     tags = {}
 726     filenodes = {}
 727     blob_marks = {}
 728     parsed_refs = {}
 729     files_cache = {}
 730
 731     gitdir = os.environ['GIT_DIR']
 732     dirname = os.path.join(gitdir, 'bzr', alias)
 733
 734     if not os.path.exists(dirname):
 735         os.makedirs(dirname)
 736
 737     repo = get_repo(url, alias)
 738
 739     marks_path = os.path.join(dirname, 'marks-int')
 740     marks = Marks(marks_path)
 741
 742     parser = Parser(repo)
 743     for line in parser:
 744         if parser.check('capabilities'):
 745             do_capabilities(parser)
 746         elif parser.check('list'):
 747             do_list(parser)
 748         elif parser.check('import'):
 749             do_import(parser)
 750         elif parser.check('export'):
 751             do_export(parser)
 752         else:
 753             die('unhandled command: %s' % line)
 754         sys.stdout.flush()
 755
 756     marks.store()
 757
 758 sys.exit(main(sys.argv))