contrib/remote-helpers/git-remote-hg

   1 #!/usr/bin/env python
   2 #
   3 # Copyright (c) 2012 Felipe Contreras
   4 #
   5
   6 # Inspired by Rocco Rutte's hg-fast-export
   7
   8 # Just copy to your ~/bin, or anywhere in your $PATH.
   9 # Then you can clone with:
  10 # git clone hg::/path/to/mercurial/repo/
  11
  12 from mercurial import hg, ui, bookmarks, context, util, encoding
  13
  14 import re
  15 import sys
  16 import os
  17 import json
  18 import shutil
  19 import subprocess
  20 import urllib
  21
  22 #
  23 # If you want to switch to hg-git compatibility mode:
  24 # git config --global remote-hg.hg-git-compat true
  25 #
  26 # git:
  27 # Sensible defaults for git.
  28 # hg bookmarks are exported as git branches, hg branches are prefixed
  29 # with 'branches/', HEAD is a special case.
  30 #
  31 # hg:
  32 # Emulate hg-git.
  33 # Only hg bookmarks are exported as git branches.
  34 # Commits are modified to preserve hg information and allow biridectionality.
  35 #
  36
  37 NAME_RE = re.compile('^([^<>]+)')
  38 AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  39 AUTHOR_HG_RE = re.compile('^(.*?) ?<(.*?)(?:>(.+)?)?$')
  40 RAW_AUTHOR_RE = re.compile('^(\w+) (?:(.+)? )?<(.*)> (\d+) ([+-]\d+)')
  41
  42 def die(msg, *args):
  43     sys.stderr.write('ERROR: %s\n' % (msg % args))
  44     sys.exit(1)
  45
  46 def warn(msg, *args):
  47     sys.stderr.write('WARNING: %s\n' % (msg % args))
  48
  49 def gitmode(flags):
  50     return 'l' in flags and '120000' or 'x' in flags and '100755' or '100644'
  51
  52 def gittz(tz):
  53     return '%+03d%02d' % (-tz / 3600, -tz % 3600 / 60)
  54
  55 def hgmode(mode):
  56     m = { '0100755': 'x', '0120000': 'l' }
  57     return m.get(mode, '')
  58
  59 def get_config(config):
  60     cmd = ['git', 'config', '--get', config]
  61     process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  62     output, _ = process.communicate()
  63     return output
  64
  65 class Marks:
  66
  67     def __init__(self, path):
  68         self.path = path
  69         self.tips = {}
  70         self.marks = {}
  71         self.rev_marks = {}
  72         self.last_mark = 0
  73
  74         self.load()
  75
  76     def load(self):
  77         if not os.path.exists(self.path):
  78             return
  79
  80         tmp = json.load(open(self.path))
  81
  82         self.tips = tmp['tips']
  83         self.marks = tmp['marks']
  84         self.last_mark = tmp['last-mark']
  85
  86         for rev, mark in self.marks.iteritems():
  87             self.rev_marks[mark] = int(rev)
  88
  89     def dict(self):
  90         return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
  91
  92     def store(self):
  93         json.dump(self.dict(), open(self.path, 'w'))
  94
  95     def __str__(self):
  96         return str(self.dict())
  97
  98     def from_rev(self, rev):
  99         return self.marks[str(rev)]
 100
 101     def to_rev(self, mark):
 102         return self.rev_marks[mark]
 103
 104     def get_mark(self, rev):
 105         self.last_mark += 1
 106         self.marks[str(rev)] = self.last_mark
 107         return self.last_mark
 108
 109     def new_mark(self, rev, mark):
 110         self.marks[str(rev)] = mark
 111         self.rev_marks[mark] = rev
 112         self.last_mark = mark
 113
 114     def is_marked(self, rev):
 115         return self.marks.has_key(str(rev))
 116
 117     def get_tip(self, branch):
 118         return self.tips.get(branch, 0)
 119
 120     def set_tip(self, branch, tip):
 121         self.tips[branch] = tip
 122
 123 class Parser:
 124
 125     def __init__(self, repo):
 126         self.repo = repo
 127         self.line = self.get_line()
 128
 129     def get_line(self):
 130         return sys.stdin.readline().strip()
 131
 132     def __getitem__(self, i):
 133         return self.line.split()[i]
 134
 135     def check(self, word):
 136         return self.line.startswith(word)
 137
 138     def each_block(self, separator):
 139         while self.line != separator:
 140             yield self.line
 141             self.line = self.get_line()
 142
 143     def __iter__(self):
 144         return self.each_block('')
 145
 146     def next(self):
 147         self.line = self.get_line()
 148         if self.line == 'done':
 149             self.line = None
 150
 151     def get_mark(self):
 152         i = self.line.index(':') + 1
 153         return int(self.line[i:])
 154
 155     def get_data(self):
 156         if not self.check('data'):
 157             return None
 158         i = self.line.index(' ') + 1
 159         size = int(self.line[i:])
 160         return sys.stdin.read(size)
 161
 162     def get_author(self):
 163         global bad_mail
 164
 165         ex = None
 166         m = RAW_AUTHOR_RE.match(self.line)
 167         if not m:
 168             return None
 169         _, name, email, date, tz = m.groups()
 170         if name and 'ext:' in name:
 171             m = re.match('^(.+?) ext:\((.+)\)$', name)
 172             if m:
 173                 name = m.group(1)
 174                 ex = urllib.unquote(m.group(2))
 175
 176         if email != bad_mail:
 177             if name:
 178                 user = '%s <%s>' % (name, email)
 179             else:
 180                 user = '<%s>' % (email)
 181         else:
 182             user = name
 183
 184         if ex:
 185             user += ex
 186
 187         tz = int(tz)
 188         tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 189         return (user, int(date), -tz)
 190
 191 def export_file(fc):
 192     d = fc.data()
 193     print "M %s inline %s" % (gitmode(fc.flags()), fc.path())
 194     print "data %d" % len(d)
 195     print d
 196
 197 def get_filechanges(repo, ctx, parent):
 198     modified = set()
 199     added = set()
 200     removed = set()
 201
 202     cur = ctx.manifest()
 203     prev = repo[parent].manifest().copy()
 204
 205     for fn in cur:
 206         if fn in prev:
 207             if (cur.flags(fn) != prev.flags(fn) or cur[fn] != prev[fn]):
 208                 modified.add(fn)
 209             del prev[fn]
 210         else:
 211             added.add(fn)
 212     removed |= set(prev.keys())
 213
 214     return added | modified, removed
 215
 216 def fixup_user_git(user):
 217     name = mail = None
 218     user = user.replace('"', '')
 219     m = AUTHOR_RE.match(user)
 220     if m:
 221         name = m.group(1)
 222         mail = m.group(2).strip()
 223     else:
 224         m = NAME_RE.match(user)
 225         if m:
 226             name = m.group(1).strip()
 227     return (name, mail)
 228
 229 def fixup_user_hg(user):
 230     def sanitize(name):
 231         # stole this from hg-git
 232         return re.sub('[<>\n]', '?', name.lstrip('< ').rstrip('> '))
 233
 234     m = AUTHOR_HG_RE.match(user)
 235     if m:
 236         name = sanitize(m.group(1))
 237         mail = sanitize(m.group(2))
 238         ex = m.group(3)
 239         if ex:
 240             name += ' ext:(' + urllib.quote(ex) + ')'
 241     else:
 242         name = sanitize(user)
 243         if '@' in user:
 244             mail = name
 245         else:
 246             mail = None
 247
 248     return (name, mail)
 249
 250 def fixup_user(user):
 251     global mode, bad_mail
 252
 253     if mode == 'git':
 254         name, mail = fixup_user_git(user)
 255     else:
 256         name, mail = fixup_user_hg(user)
 257
 258     if not name:
 259         name = bad_name
 260     if not mail:
 261         mail = bad_mail
 262
 263     return '%s <%s>' % (name, mail)
 264
 265 def get_repo(url, alias):
 266     global dirname, peer
 267
 268     myui = ui.ui()
 269     myui.setconfig('ui', 'interactive', 'off')
 270
 271     if hg.islocal(url):
 272         repo = hg.repository(myui, url)
 273     else:
 274         local_path = os.path.join(dirname, 'clone')
 275         if not os.path.exists(local_path):
 276             peer, dstpeer = hg.clone(myui, {}, url, local_path, update=False, pull=True)
 277             repo = dstpeer.local()
 278         else:
 279             repo = hg.repository(myui, local_path)
 280             peer = hg.peer(myui, {}, url)
 281             repo.pull(peer, heads=None, force=True)
 282
 283     return repo
 284
 285 def rev_to_mark(rev):
 286     global marks
 287     return marks.from_rev(rev)
 288
 289 def mark_to_rev(mark):
 290     global marks
 291     return marks.to_rev(mark)
 292
 293 def export_ref(repo, name, kind, head):
 294     global prefix, marks, mode
 295
 296     ename = '%s/%s' % (kind, name)
 297     tip = marks.get_tip(ename)
 298
 299     # mercurial takes too much time checking this
 300     if tip and tip == head.rev():
 301         # nothing to do
 302         return
 303     revs = xrange(tip, head.rev() + 1)
 304     count = 0
 305
 306     revs = [rev for rev in revs if not marks.is_marked(rev)]
 307
 308     for rev in revs:
 309
 310         c = repo[rev]
 311         (manifest, user, (time, tz), files, desc, extra) = repo.changelog.read(c.node())
 312         rev_branch = extra['branch']
 313
 314         author = "%s %d %s" % (fixup_user(user), time, gittz(tz))
 315         if 'committer' in extra:
 316             user, time, tz = extra['committer'].rsplit(' ', 2)
 317             committer = "%s %s %s" % (user, time, gittz(int(tz)))
 318         else:
 319             committer = author
 320
 321         parents = [p for p in repo.changelog.parentrevs(rev) if p >= 0]
 322
 323         if len(parents) == 0:
 324             modified = c.manifest().keys()
 325             removed = []
 326         else:
 327             modified, removed = get_filechanges(repo, c, parents[0])
 328
 329         if mode == 'hg':
 330             extra_msg = ''
 331
 332             if rev_branch != 'default':
 333                 extra_msg += 'branch : %s\n' % rev_branch
 334
 335             renames = []
 336             for f in c.files():
 337                 if f not in c.manifest():
 338                     continue
 339                 rename = c.filectx(f).renamed()
 340                 if rename:
 341                     renames.append((rename[0], f))
 342
 343             for e in renames:
 344                 extra_msg += "rename : %s => %s\n" % e
 345
 346             for key, value in extra.iteritems():
 347                 if key in ('author', 'committer', 'encoding', 'message', 'branch', 'hg-git'):
 348                     continue
 349                 else:
 350                     extra_msg += "extra : %s : %s\n" % (key, urllib.quote(value))
 351
 352             desc += '\n'
 353             if extra_msg:
 354                 desc += '\n--HG--\n' + extra_msg
 355
 356         if len(parents) == 0 and rev:
 357             print 'reset %s/%s' % (prefix, ename)
 358
 359         print "commit %s/%s" % (prefix, ename)
 360         print "mark :%d" % (marks.get_mark(rev))
 361         print "author %s" % (author)
 362         print "committer %s" % (committer)
 363         print "data %d" % (len(desc))
 364         print desc
 365
 366         if len(parents) > 0:
 367             print "from :%s" % (rev_to_mark(parents[0]))
 368             if len(parents) > 1:
 369                 print "merge :%s" % (rev_to_mark(parents[1]))
 370
 371         for f in modified:
 372             export_file(c.filectx(f))
 373         for f in removed:
 374             print "D %s" % (f)
 375         print
 376
 377         count += 1
 378         if (count % 100 == 0):
 379             print "progress revision %d '%s' (%d/%d)" % (rev, name, count, len(revs))
 380             print "#############################################################"
 381
 382     # make sure the ref is updated
 383     print "reset %s/%s" % (prefix, ename)
 384     print "from :%u" % rev_to_mark(rev)
 385     print
 386
 387     marks.set_tip(ename, rev)
 388
 389 def export_tag(repo, tag):
 390     export_ref(repo, tag, 'tags', repo[tag])
 391
 392 def export_bookmark(repo, bmark):
 393     head = bmarks[bmark]
 394     export_ref(repo, bmark, 'bookmarks', head)
 395
 396 def export_branch(repo, branch):
 397     tip = get_branch_tip(repo, branch)
 398     head = repo[tip]
 399     export_ref(repo, branch, 'branches', head)
 400
 401 def export_head(repo):
 402     global g_head
 403     export_ref(repo, g_head[0], 'bookmarks', g_head[1])
 404
 405 def do_capabilities(parser):
 406     global prefix, dirname
 407
 408     print "import"
 409     print "export"
 410     print "refspec refs/heads/branches/*:%s/branches/*" % prefix
 411     print "refspec refs/heads/*:%s/bookmarks/*" % prefix
 412     print "refspec refs/tags/*:%s/tags/*" % prefix
 413
 414     path = os.path.join(dirname, 'marks-git')
 415
 416     if os.path.exists(path):
 417         print "*import-marks %s" % path
 418     print "*export-marks %s" % path
 419
 420     print
 421
 422 def get_branch_tip(repo, branch):
 423     global branches
 424
 425     heads = branches.get(branch, None)
 426     if not heads:
 427         return None
 428
 429     # verify there's only one head
 430     if (len(heads) > 1):
 431         warn("Branch '%s' has more than one head, consider merging" % branch)
 432         # older versions of mercurial don't have this
 433         if hasattr(repo, "branchtip"):
 434             return repo.branchtip(branch)
 435
 436     return heads[0]
 437
 438 def list_head(repo, cur):
 439     global g_head, bmarks
 440
 441     head = bookmarks.readcurrent(repo)
 442     if head:
 443         node = repo[head]
 444     else:
 445         # fake bookmark from current branch
 446         head = cur
 447         node = repo['.']
 448         if not node:
 449             node = repo['tip']
 450         if not node:
 451             return
 452         if head == 'default':
 453             head = 'master'
 454         bmarks[head] = node
 455
 456     print "@refs/heads/%s HEAD" % head
 457     g_head = (head, node)
 458
 459 def do_list(parser):
 460     global branches, bmarks, mode, track_branches
 461
 462     repo = parser.repo
 463     for bmark, node in bookmarks.listbookmarks(repo).iteritems():
 464         bmarks[bmark] = repo[node]
 465
 466     cur = repo.dirstate.branch()
 467
 468     list_head(repo, cur)
 469
 470     if track_branches:
 471         for branch in repo.branchmap():
 472             heads = repo.branchheads(branch)
 473             if len(heads):
 474                 branches[branch] = heads
 475
 476         for branch in branches:
 477             print "? refs/heads/branches/%s" % branch
 478
 479     for bmark in bmarks:
 480         print "? refs/heads/%s" % bmark
 481
 482     for tag, node in repo.tagslist():
 483         if tag == 'tip':
 484             continue
 485         print "? refs/tags/%s" % tag
 486
 487     print
 488
 489 def do_import(parser):
 490     repo = parser.repo
 491
 492     path = os.path.join(dirname, 'marks-git')
 493
 494     print "feature done"
 495     if os.path.exists(path):
 496         print "feature import-marks=%s" % path
 497     print "feature export-marks=%s" % path
 498     sys.stdout.flush()
 499
 500     tmp = encoding.encoding
 501     encoding.encoding = 'utf-8'
 502
 503     # lets get all the import lines
 504     while parser.check('import'):
 505         ref = parser[1]
 506
 507         if (ref == 'HEAD'):
 508             export_head(repo)
 509         elif ref.startswith('refs/heads/branches/'):
 510             branch = ref[len('refs/heads/branches/'):]
 511             export_branch(repo, branch)
 512         elif ref.startswith('refs/heads/'):
 513             bmark = ref[len('refs/heads/'):]
 514             export_bookmark(repo, bmark)
 515         elif ref.startswith('refs/tags/'):
 516             tag = ref[len('refs/tags/'):]
 517             export_tag(repo, tag)
 518
 519         parser.next()
 520
 521     encoding.encoding = tmp
 522
 523     print 'done'
 524
 525 def parse_blob(parser):
 526     global blob_marks
 527
 528     parser.next()
 529     mark = parser.get_mark()
 530     parser.next()
 531     data = parser.get_data()
 532     blob_marks[mark] = data
 533     parser.next()
 534     return
 535
 536 def get_merge_files(repo, p1, p2, files):
 537     for e in repo[p1].files():
 538         if e not in files:
 539             if e not in repo[p1].manifest():
 540                 continue
 541             f = { 'ctx' : repo[p1][e] }
 542             files[e] = f
 543
 544 def parse_commit(parser):
 545     global marks, blob_marks, bmarks, parsed_refs
 546     global mode
 547
 548     from_mark = merge_mark = None
 549
 550     ref = parser[1]
 551     parser.next()
 552
 553     commit_mark = parser.get_mark()
 554     parser.next()
 555     author = parser.get_author()
 556     parser.next()
 557     committer = parser.get_author()
 558     parser.next()
 559     data = parser.get_data()
 560     parser.next()
 561     if parser.check('from'):
 562         from_mark = parser.get_mark()
 563         parser.next()
 564     if parser.check('merge'):
 565         merge_mark = parser.get_mark()
 566         parser.next()
 567         if parser.check('merge'):
 568             die('octopus merges are not supported yet')
 569
 570     files = {}
 571
 572     for line in parser:
 573         if parser.check('M'):
 574             t, m, mark_ref, path = line.split(' ', 3)
 575             mark = int(mark_ref[1:])
 576             f = { 'mode' : hgmode(m), 'data' : blob_marks[mark] }
 577         elif parser.check('D'):
 578             t, path = line.split(' ')
 579             f = { 'deleted' : True }
 580         else:
 581             die('Unknown file command: %s' % line)
 582         files[path] = f
 583
 584     def getfilectx(repo, memctx, f):
 585         of = files[f]
 586         if 'deleted' in of:
 587             raise IOError
 588         if 'ctx' in of:
 589             return of['ctx']
 590         is_exec = of['mode'] == 'x'
 591         is_link = of['mode'] == 'l'
 592         rename = of.get('rename', None)
 593         return context.memfilectx(f, of['data'],
 594                 is_link, is_exec, rename)
 595
 596     repo = parser.repo
 597
 598     user, date, tz = author
 599     extra = {}
 600
 601     if committer != author:
 602         extra['committer'] = "%s %u %u" % committer
 603
 604     if from_mark:
 605         p1 = repo.changelog.node(mark_to_rev(from_mark))
 606     else:
 607         p1 = '\0' * 20
 608
 609     if merge_mark:
 610         p2 = repo.changelog.node(mark_to_rev(merge_mark))
 611     else:
 612         p2 = '\0' * 20
 613
 614     #
 615     # If files changed from any of the parents, hg wants to know, but in git if
 616     # nothing changed from the first parent, nothing changed.
 617     #
 618     if merge_mark:
 619         get_merge_files(repo, p1, p2, files)
 620
 621     if mode == 'hg':
 622         i = data.find('\n--HG--\n')
 623         if i >= 0:
 624             tmp = data[i + len('\n--HG--\n'):].strip()
 625             for k, v in [e.split(' : ') for e in tmp.split('\n')]:
 626                 if k == 'rename':
 627                     old, new = v.split(' => ', 1)
 628                     files[new]['rename'] = old
 629                 elif k == 'branch':
 630                     extra[k] = v
 631                 elif k == 'extra':
 632                     ek, ev = v.split(' : ', 1)
 633                     extra[ek] = urllib.unquote(ev)
 634             data = data[:i]
 635
 636     ctx = context.memctx(repo, (p1, p2), data,
 637             files.keys(), getfilectx,
 638             user, (date, tz), extra)
 639
 640     tmp = encoding.encoding
 641     encoding.encoding = 'utf-8'
 642
 643     node = repo.commitctx(ctx)
 644
 645     encoding.encoding = tmp
 646
 647     rev = repo[node].rev()
 648
 649     parsed_refs[ref] = node
 650
 651     marks.new_mark(rev, commit_mark)
 652
 653 def parse_reset(parser):
 654     ref = parser[1]
 655     parser.next()
 656     # ugh
 657     if parser.check('commit'):
 658         parse_commit(parser)
 659         return
 660     if not parser.check('from'):
 661         return
 662     from_mark = parser.get_mark()
 663     parser.next()
 664
 665     node = parser.repo.changelog.node(mark_to_rev(from_mark))
 666     parsed_refs[ref] = node
 667
 668 def parse_tag(parser):
 669     name = parser[1]
 670     parser.next()
 671     from_mark = parser.get_mark()
 672     parser.next()
 673     tagger = parser.get_author()
 674     parser.next()
 675     data = parser.get_data()
 676     parser.next()
 677
 678     # nothing to do
 679
 680 def do_export(parser):
 681     global parsed_refs, bmarks, peer
 682
 683     parser.next()
 684
 685     for line in parser.each_block('done'):
 686         if parser.check('blob'):
 687             parse_blob(parser)
 688         elif parser.check('commit'):
 689             parse_commit(parser)
 690         elif parser.check('reset'):
 691             parse_reset(parser)
 692         elif parser.check('tag'):
 693             parse_tag(parser)
 694         elif parser.check('feature'):
 695             pass
 696         else:
 697             die('unhandled export command: %s' % line)
 698
 699     for ref, node in parsed_refs.iteritems():
 700         if ref.startswith('refs/heads/branches'):
 701             pass
 702         elif ref.startswith('refs/heads/'):
 703             bmark = ref[len('refs/heads/'):]
 704             if bmark in bmarks:
 705                 old = bmarks[bmark].hex()
 706             else:
 707                 old = ''
 708             if not bookmarks.pushbookmark(parser.repo, bmark, old, node):
 709                 continue
 710         elif ref.startswith('refs/tags/'):
 711             tag = ref[len('refs/tags/'):]
 712             parser.repo.tag([tag], node, None, True, None, {})
 713         else:
 714             # transport-helper/fast-export bugs
 715             continue
 716         print "ok %s" % ref
 717
 718     print
 719
 720     if peer:
 721         parser.repo.push(peer, force=False)
 722
 723 def main(args):
 724     global prefix, dirname, branches, bmarks
 725     global marks, blob_marks, parsed_refs
 726     global peer, mode, bad_mail, bad_name
 727     global track_branches
 728
 729     alias = args[1]
 730     url = args[2]
 731     peer = None
 732
 733     hg_git_compat = False
 734     track_branches = True
 735     try:
 736         if get_config('remote-hg.hg-git-compat') == 'true\n':
 737             hg_git_compat = True
 738             track_branches = False
 739         if get_config('remote-hg.track-branches') == 'false\n':
 740             track_branches = False
 741     except subprocess.CalledProcessError:
 742         pass
 743
 744     if hg_git_compat:
 745         mode = 'hg'
 746         bad_mail = 'none@none'
 747         bad_name = ''
 748     else:
 749         mode = 'git'
 750         bad_mail = 'unknown'
 751         bad_name = 'Unknown'
 752
 753     if alias[4:] == url:
 754         is_tmp = True
 755         alias = util.sha1(alias).hexdigest()
 756     else:
 757         is_tmp = False
 758
 759     gitdir = os.environ['GIT_DIR']
 760     dirname = os.path.join(gitdir, 'hg', alias)
 761     branches = {}
 762     bmarks = {}
 763     blob_marks = {}
 764     parsed_refs = {}
 765
 766     repo = get_repo(url, alias)
 767     prefix = 'refs/hg/%s' % alias
 768
 769     if not os.path.exists(dirname):
 770         os.makedirs(dirname)
 771
 772     marks_path = os.path.join(dirname, 'marks-hg')
 773     marks = Marks(marks_path)
 774
 775     parser = Parser(repo)
 776     for line in parser:
 777         if parser.check('capabilities'):
 778             do_capabilities(parser)
 779         elif parser.check('list'):
 780             do_list(parser)
 781         elif parser.check('import'):
 782             do_import(parser)
 783         elif parser.check('export'):
 784             do_export(parser)
 785         else:
 786             die('unhandled command: %s' % line)
 787         sys.stdout.flush()
 788
 789     if not is_tmp:
 790         marks.store()
 791     else:
 792         shutil.rmtree(dirname)
 793
 794 sys.exit(main(sys.argv))