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 $PATH.
   9 # Then you can clone with:
  10 # git clone hg::/path/to/mercurial/repo/
  11 #
  12 # For remote repositories a local clone is stored in
  13 # "$GIT_DIR/hg/origin/clone/.hg/".
  14
  15 from mercurial import hg, ui, bookmarks, context, encoding, node, error, extensions, discovery, util
  16
  17 import re
  18 import sys
  19 import os
  20 import json
  21 import shutil
  22 import subprocess
  23 import urllib
  24 import atexit
  25 import urlparse, hashlib
  26 import time as ptime
  27
  28 #
  29 # If you want to see Mercurial revisions as Git commit notes:
  30 # git config core.notesRef refs/notes/hg
  31 #
  32 # If you are not in hg-git-compat mode and want to disable the tracking of
  33 # named branches:
  34 # git config --global remote-hg.track-branches false
  35 #
  36 # If you want the equivalent of hg's clone/pull--insecure option:
  37 # git config --global remote-hg.insecure true
  38 #
  39 # If you want to switch to hg-git compatibility mode:
  40 # git config --global remote-hg.hg-git-compat true
  41 #
  42 # git:
  43 # Sensible defaults for git.
  44 # hg bookmarks are exported as git branches, hg branches are prefixed
  45 # with 'branches/', HEAD is a special case.
  46 #
  47 # hg:
  48 # Emulate hg-git.
  49 # Only hg bookmarks are exported as git branches.
  50 # Commits are modified to preserve hg information and allow bidirectionality.
  51 #
  52
  53 NAME_RE = re.compile('^([^<>]+)')
  54 AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  55 EMAIL_RE = re.compile('^([^<>]+[^ \\\t<>])?\\b(?:[ \\t<>]*?)\\b([^ \\t<>]+@[^ \\t<>]+)')
  56 AUTHOR_HG_RE = re.compile('^(.*?) ?<(.*?)(?:>(.+)?)?$')
  57 RAW_AUTHOR_RE = re.compile('^(\w+) (?:(.+)? )?<(.*)> (\d+) ([+-]\d+)')
  58
  59 VERSION = 2
  60
  61 def die(msg, *args):
  62     sys.stderr.write('ERROR: %s\n' % (msg % args))
  63     sys.exit(1)
  64
  65 def warn(msg, *args):
  66     sys.stderr.write('WARNING: %s\n' % (msg % args))
  67
  68 def gitmode(flags):
  69     return 'l' in flags and '120000' or 'x' in flags and '100755' or '100644'
  70
  71 def gittz(tz):
  72     return '%+03d%02d' % (-tz / 3600, -tz % 3600 / 60)
  73
  74 def hgmode(mode):
  75     m = { '100755': 'x', '120000': 'l' }
  76     return m.get(mode, '')
  77
  78 def hghex(n):
  79     return node.hex(n)
  80
  81 def hgbin(n):
  82     return node.bin(n)
  83
  84 def hgref(ref):
  85     return ref.replace('___', ' ')
  86
  87 def gitref(ref):
  88     return ref.replace(' ', '___')
  89
  90 def check_version(*check):
  91     if not hg_version:
  92         return True
  93     return hg_version >= check
  94
  95 def get_config(config):
  96     cmd = ['git', 'config', '--get', config]
  97     process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  98     output, _ = process.communicate()
  99     return output
 100
 101 def get_config_bool(config, default=False):
 102     value = get_config(config).rstrip('\n')
 103     if value == "true":
 104         return True
 105     elif value == "false":
 106         return False
 107     else:
 108         return default
 109
 110 class Marks:
 111
 112     def __init__(self, path, repo):
 113         self.path = path
 114         self.repo = repo
 115         self.clear()
 116         self.load()
 117
 118         if self.version < VERSION:
 119             if self.version == 1:
 120                 self.upgrade_one()
 121
 122             # upgraded?
 123             if self.version < VERSION:
 124                 self.clear()
 125                 self.version = VERSION
 126
 127     def clear(self):
 128         self.tips = {}
 129         self.marks = {}
 130         self.rev_marks = {}
 131         self.last_mark = 0
 132         self.version = 0
 133         self.last_note = 0
 134
 135     def load(self):
 136         if not os.path.exists(self.path):
 137             return
 138
 139         tmp = json.load(open(self.path))
 140
 141         self.tips = tmp['tips']
 142         self.marks = tmp['marks']
 143         self.last_mark = tmp['last-mark']
 144         self.version = tmp.get('version', 1)
 145         self.last_note = tmp.get('last-note', 0)
 146
 147         for rev, mark in self.marks.iteritems():
 148             self.rev_marks[mark] = rev
 149
 150     def upgrade_one(self):
 151         def get_id(rev):
 152             return hghex(self.repo.changelog.node(int(rev)))
 153         self.tips = dict((name, get_id(rev)) for name, rev in self.tips.iteritems())
 154         self.marks = dict((get_id(rev), mark) for rev, mark in self.marks.iteritems())
 155         self.rev_marks = dict((mark, get_id(rev)) for mark, rev in self.rev_marks.iteritems())
 156         self.version = 2
 157
 158     def dict(self):
 159         return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark, 'version' : self.version, 'last-note' : self.last_note }
 160
 161     def store(self):
 162         json.dump(self.dict(), open(self.path, 'w'))
 163
 164     def __str__(self):
 165         return str(self.dict())
 166
 167     def from_rev(self, rev):
 168         return self.marks[rev]
 169
 170     def to_rev(self, mark):
 171         return str(self.rev_marks[mark])
 172
 173     def next_mark(self):
 174         self.last_mark += 1
 175         return self.last_mark
 176
 177     def get_mark(self, rev):
 178         self.last_mark += 1
 179         self.marks[rev] = self.last_mark
 180         return self.last_mark
 181
 182     def new_mark(self, rev, mark):
 183         self.marks[rev] = mark
 184         self.rev_marks[mark] = rev
 185         self.last_mark = mark
 186
 187     def is_marked(self, rev):
 188         return rev in self.marks
 189
 190     def get_tip(self, branch):
 191         return str(self.tips[branch])
 192
 193     def set_tip(self, branch, tip):
 194         self.tips[branch] = tip
 195
 196 class Parser:
 197
 198     def __init__(self, repo):
 199         self.repo = repo
 200         self.line = self.get_line()
 201
 202     def get_line(self):
 203         return sys.stdin.readline().strip()
 204
 205     def __getitem__(self, i):
 206         return self.line.split()[i]
 207
 208     def check(self, word):
 209         return self.line.startswith(word)
 210
 211     def each_block(self, separator):
 212         while self.line != separator:
 213             yield self.line
 214             self.line = self.get_line()
 215
 216     def __iter__(self):
 217         return self.each_block('')
 218
 219     def next(self):
 220         self.line = self.get_line()
 221         if self.line == 'done':
 222             self.line = None
 223
 224     def get_mark(self):
 225         i = self.line.index(':') + 1
 226         return int(self.line[i:])
 227
 228     def get_data(self):
 229         if not self.check('data'):
 230             return None
 231         i = self.line.index(' ') + 1
 232         size = int(self.line[i:])
 233         return sys.stdin.read(size)
 234
 235     def get_author(self):
 236         ex = None
 237         m = RAW_AUTHOR_RE.match(self.line)
 238         if not m:
 239             return None
 240         _, name, email, date, tz = m.groups()
 241         if name and 'ext:' in name:
 242             m = re.match('^(.+?) ext:\((.+)\)$', name)
 243             if m:
 244                 name = m.group(1)
 245                 ex = urllib.unquote(m.group(2))
 246
 247         if email != bad_mail:
 248             if name:
 249                 user = '%s <%s>' % (name, email)
 250             else:
 251                 user = '<%s>' % (email)
 252         else:
 253             user = name
 254
 255         if ex:
 256             user += ex
 257
 258         tz = int(tz)
 259         tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 260         return (user, int(date), -tz)
 261
 262 def fix_file_path(path):
 263     if not os.path.isabs(path):
 264         return path
 265     return os.path.relpath(path, '/')
 266
 267 def export_files(files):
 268     final = []
 269     for f in files:
 270         fid = node.hex(f.filenode())
 271
 272         if fid in filenodes:
 273             mark = filenodes[fid]
 274         else:
 275             mark = marks.next_mark()
 276             filenodes[fid] = mark
 277             d = f.data()
 278
 279             print "blob"
 280             print "mark :%u" % mark
 281             print "data %d" % len(d)
 282             print d
 283
 284         path = fix_file_path(f.path())
 285         final.append((gitmode(f.flags()), mark, path))
 286
 287     return final
 288
 289 def get_filechanges(repo, ctx, parent):
 290     modified = set()
 291     added = set()
 292     removed = set()
 293
 294     # load earliest manifest first for caching reasons
 295     prev = parent.manifest().copy()
 296     cur = ctx.manifest()
 297
 298     for fn in cur:
 299         if fn in prev:
 300             if (cur.flags(fn) != prev.flags(fn) or cur[fn] != prev[fn]):
 301                 modified.add(fn)
 302             del prev[fn]
 303         else:
 304             added.add(fn)
 305     removed |= set(prev.keys())
 306
 307     return added | modified, removed
 308
 309 def fixup_user_git(user):
 310     name = mail = None
 311     user = user.replace('"', '')
 312     m = AUTHOR_RE.match(user)
 313     if m:
 314         name = m.group(1)
 315         mail = m.group(2).strip()
 316     else:
 317         m = EMAIL_RE.match(user)
 318         if m:
 319             name = m.group(1)
 320             mail = m.group(2)
 321         else:
 322             m = NAME_RE.match(user)
 323             if m:
 324                 name = m.group(1).strip()
 325     return (name, mail)
 326
 327 def fixup_user_hg(user):
 328     def sanitize(name):
 329         # stole this from hg-git
 330         return re.sub('[<>\n]', '?', name.lstrip('< ').rstrip('> '))
 331
 332     m = AUTHOR_HG_RE.match(user)
 333     if m:
 334         name = sanitize(m.group(1))
 335         mail = sanitize(m.group(2))
 336         ex = m.group(3)
 337         if ex:
 338             name += ' ext:(' + urllib.quote(ex) + ')'
 339     else:
 340         name = sanitize(user)
 341         if '@' in user:
 342             mail = name
 343         else:
 344             mail = None
 345
 346     return (name, mail)
 347
 348 def fixup_user(user):
 349     if mode == 'git':
 350         name, mail = fixup_user_git(user)
 351     else:
 352         name, mail = fixup_user_hg(user)
 353
 354     if not name:
 355         name = bad_name
 356     if not mail:
 357         mail = bad_mail
 358
 359     return '%s <%s>' % (name, mail)
 360
 361 def updatebookmarks(repo, peer):
 362     remotemarks = peer.listkeys('bookmarks')
 363     localmarks = repo._bookmarks
 364
 365     if not remotemarks:
 366         return
 367
 368     for k, v in remotemarks.iteritems():
 369         localmarks[k] = hgbin(v)
 370
 371     if hasattr(localmarks, 'write'):
 372         localmarks.write()
 373     else:
 374         bookmarks.write(repo)
 375
 376 def get_repo(url, alias):
 377     global peer
 378
 379     myui = ui.ui()
 380     myui.setconfig('ui', 'interactive', 'off')
 381     myui.fout = sys.stderr
 382
 383     if get_config_bool('remote-hg.insecure'):
 384         myui.setconfig('web', 'cacerts', '')
 385
 386     extensions.loadall(myui)
 387
 388     if hg.islocal(url) and not os.environ.get('GIT_REMOTE_HG_TEST_REMOTE'):
 389         repo = hg.repository(myui, url)
 390         if not os.path.exists(dirname):
 391             os.makedirs(dirname)
 392     else:
 393         shared_path = os.path.join(gitdir, 'hg')
 394
 395         # check and upgrade old organization
 396         hg_path = os.path.join(shared_path, '.hg')
 397         if os.path.exists(shared_path) and not os.path.exists(hg_path):
 398             repos = os.listdir(shared_path)
 399             for x in repos:
 400                 local_hg = os.path.join(shared_path, x, 'clone', '.hg')
 401                 if not os.path.exists(local_hg):
 402                     continue
 403                 if not os.path.exists(hg_path):
 404                     shutil.move(local_hg, hg_path)
 405                 shutil.rmtree(os.path.join(shared_path, x, 'clone'))
 406
 407         # setup shared repo (if not there)
 408         try:
 409             hg.peer(myui, {}, shared_path, create=True)
 410         except error.RepoError:
 411             pass
 412
 413         if not os.path.exists(dirname):
 414             os.makedirs(dirname)
 415
 416         local_path = os.path.join(dirname, 'clone')
 417         if not os.path.exists(local_path):
 418             hg.share(myui, shared_path, local_path, update=False)
 419
 420         repo = hg.repository(myui, local_path)
 421         try:
 422             peer = hg.peer(myui, {}, url)
 423         except:
 424             die('Repository error')
 425         repo.pull(peer, heads=None, force=True)
 426
 427         updatebookmarks(repo, peer)
 428
 429     return repo
 430
 431 def rev_to_mark(rev):
 432     return marks.from_rev(rev.hex())
 433
 434 def mark_to_rev(mark):
 435     return marks.to_rev(mark)
 436
 437 def export_ref(repo, name, kind, head):
 438     ename = '%s/%s' % (kind, name)
 439     try:
 440         tip = marks.get_tip(ename)
 441         tip = repo[tip].rev()
 442     except:
 443         tip = 0
 444
 445     revs = xrange(tip, head.rev() + 1)
 446     total = len(revs)
 447
 448     for rev in revs:
 449
 450         c = repo[rev]
 451         node = c.node()
 452
 453         if marks.is_marked(c.hex()):
 454             continue
 455
 456         (manifest, user, (time, tz), files, desc, extra) = repo.changelog.read(node)
 457         rev_branch = extra['branch']
 458
 459         author = "%s %d %s" % (fixup_user(user), time, gittz(tz))
 460         if 'committer' in extra:
 461             user, time, tz = extra['committer'].rsplit(' ', 2)
 462             committer = "%s %s %s" % (user, time, gittz(int(tz)))
 463         else:
 464             committer = author
 465
 466         parents = [repo[p] for p in repo.changelog.parentrevs(rev) if p >= 0]
 467
 468         if len(parents) == 0:
 469             modified = c.manifest().keys()
 470             removed = []
 471         else:
 472             modified, removed = get_filechanges(repo, c, parents[0])
 473
 474         desc += '\n'
 475
 476         if mode == 'hg':
 477             extra_msg = ''
 478
 479             if rev_branch != 'default':
 480                 extra_msg += 'branch : %s\n' % rev_branch
 481
 482             renames = []
 483             for f in c.files():
 484                 if f not in c.manifest():
 485                     continue
 486                 rename = c.filectx(f).renamed()
 487                 if rename:
 488                     renames.append((rename[0], f))
 489
 490             for e in renames:
 491                 extra_msg += "rename : %s => %s\n" % e
 492
 493             for key, value in extra.iteritems():
 494                 if key in ('author', 'committer', 'encoding', 'message', 'branch', 'hg-git'):
 495                     continue
 496                 else:
 497                     extra_msg += "extra : %s : %s\n" % (key, urllib.quote(value))
 498
 499             if extra_msg:
 500                 desc += '\n--HG--\n' + extra_msg
 501
 502         if len(parents) == 0 and rev:
 503             print 'reset %s/%s' % (prefix, ename)
 504
 505         modified_final = export_files(c.filectx(f) for f in modified)
 506
 507         print "commit %s/%s" % (prefix, ename)
 508         print "mark :%d" % (marks.get_mark(c.hex()))
 509         print "author %s" % (author)
 510         print "committer %s" % (committer)
 511         print "data %d" % (len(desc))
 512         print desc
 513
 514         if len(parents) > 0:
 515             print "from :%s" % (rev_to_mark(parents[0]))
 516             if len(parents) > 1:
 517                 print "merge :%s" % (rev_to_mark(parents[1]))
 518
 519         for f in removed:
 520             print "D %s" % (fix_file_path(f))
 521         for f in modified_final:
 522             print "M %s :%u %s" % f
 523         print
 524
 525         progress = (rev - tip)
 526         if (progress % 100 == 0):
 527             print "progress revision %d '%s' (%d/%d)" % (rev, name, progress, total)
 528
 529     # make sure the ref is updated
 530     print "reset %s/%s" % (prefix, ename)
 531     print "from :%u" % rev_to_mark(head)
 532     print
 533
 534     pending_revs = set(revs) - notes
 535     if pending_revs:
 536         note_mark = marks.next_mark()
 537         ref = "refs/notes/hg"
 538
 539         print "commit %s" % ref
 540         print "mark :%d" % (note_mark)
 541         print "committer remote-hg <> %s" % (ptime.strftime('%s %z'))
 542         desc = "Notes for %s\n" % (name)
 543         print "data %d" % (len(desc))
 544         print desc
 545         if marks.last_note:
 546             print "from :%u" % marks.last_note
 547
 548         for rev in pending_revs:
 549             notes.add(rev)
 550             c = repo[rev]
 551             print "N inline :%u" % rev_to_mark(c)
 552             msg = c.hex()
 553             print "data %d" % (len(msg))
 554             print msg
 555         print
 556
 557         marks.last_note = note_mark
 558
 559     marks.set_tip(ename, head.hex())
 560
 561 def export_tag(repo, tag):
 562     export_ref(repo, tag, 'tags', repo[hgref(tag)])
 563
 564 def export_bookmark(repo, bmark):
 565     head = bmarks[hgref(bmark)]
 566     export_ref(repo, bmark, 'bookmarks', head)
 567
 568 def export_branch(repo, branch):
 569     tip = get_branch_tip(repo, branch)
 570     head = repo[tip]
 571     export_ref(repo, branch, 'branches', head)
 572
 573 def export_head(repo):
 574     export_ref(repo, g_head[0], 'bookmarks', g_head[1])
 575
 576 def do_capabilities(parser):
 577     print "import"
 578     print "export"
 579     print "refspec refs/heads/branches/*:%s/branches/*" % prefix
 580     print "refspec refs/heads/*:%s/bookmarks/*" % prefix
 581     print "refspec refs/tags/*:%s/tags/*" % prefix
 582
 583     path = os.path.join(dirname, 'marks-git')
 584
 585     if os.path.exists(path):
 586         print "*import-marks %s" % path
 587     print "*export-marks %s" % path
 588     print "option"
 589
 590     print
 591
 592 def branch_tip(branch):
 593     return branches[branch][-1]
 594
 595 def get_branch_tip(repo, branch):
 596     heads = branches.get(hgref(branch), None)
 597     if not heads:
 598         return None
 599
 600     # verify there's only one head
 601     if (len(heads) > 1):
 602         warn("Branch '%s' has more than one head, consider merging" % branch)
 603         return branch_tip(hgref(branch))
 604
 605     return heads[0]
 606
 607 def list_head(repo, cur):
 608     global g_head, fake_bmark
 609
 610     if 'default' not in branches:
 611         # empty repo
 612         return
 613
 614     node = repo[branch_tip('default')]
 615     head = 'master' if not 'master' in bmarks else 'default'
 616     fake_bmark = head
 617     bmarks[head] = node
 618
 619     head = gitref(head)
 620     print "@refs/heads/%s HEAD" % head
 621     g_head = (head, node)
 622
 623 def do_list(parser):
 624     repo = parser.repo
 625     for bmark, node in bookmarks.listbookmarks(repo).iteritems():
 626         bmarks[bmark] = repo[node]
 627
 628     cur = repo.dirstate.branch()
 629     orig = peer if peer else repo
 630
 631     for branch, heads in orig.branchmap().iteritems():
 632         # only open heads
 633         heads = [h for h in heads if 'close' not in repo.changelog.read(h)[5]]
 634         if heads:
 635             branches[branch] = heads
 636
 637     list_head(repo, cur)
 638
 639     if track_branches:
 640         for branch in branches:
 641             print "? refs/heads/branches/%s" % gitref(branch)
 642
 643     for bmark in bmarks:
 644         print "? refs/heads/%s" % gitref(bmark)
 645
 646     for tag, node in repo.tagslist():
 647         if tag == 'tip':
 648             continue
 649         print "? refs/tags/%s" % gitref(tag)
 650
 651     print
 652
 653 def do_import(parser):
 654     repo = parser.repo
 655
 656     path = os.path.join(dirname, 'marks-git')
 657
 658     print "feature done"
 659     if os.path.exists(path):
 660         print "feature import-marks=%s" % path
 661     print "feature export-marks=%s" % path
 662     print "feature force"
 663     sys.stdout.flush()
 664
 665     tmp = encoding.encoding
 666     encoding.encoding = 'utf-8'
 667
 668     # lets get all the import lines
 669     while parser.check('import'):
 670         ref = parser[1]
 671
 672         if (ref == 'HEAD'):
 673             export_head(repo)
 674         elif ref.startswith('refs/heads/branches/'):
 675             branch = ref[len('refs/heads/branches/'):]
 676             export_branch(repo, branch)
 677         elif ref.startswith('refs/heads/'):
 678             bmark = ref[len('refs/heads/'):]
 679             export_bookmark(repo, bmark)
 680         elif ref.startswith('refs/tags/'):
 681             tag = ref[len('refs/tags/'):]
 682             export_tag(repo, tag)
 683
 684         parser.next()
 685
 686     encoding.encoding = tmp
 687
 688     print 'done'
 689
 690 def parse_blob(parser):
 691     parser.next()
 692     mark = parser.get_mark()
 693     parser.next()
 694     data = parser.get_data()
 695     blob_marks[mark] = data
 696     parser.next()
 697
 698 def get_merge_files(repo, p1, p2, files):
 699     for e in repo[p1].files():
 700         if e not in files:
 701             if e not in repo[p1].manifest():
 702                 continue
 703             f = { 'ctx' : repo[p1][e] }
 704             files[e] = f
 705
 706 def parse_commit(parser):
 707     from_mark = merge_mark = None
 708
 709     ref = parser[1]
 710     parser.next()
 711
 712     commit_mark = parser.get_mark()
 713     parser.next()
 714     author = parser.get_author()
 715     parser.next()
 716     committer = parser.get_author()
 717     parser.next()
 718     data = parser.get_data()
 719     parser.next()
 720     if parser.check('from'):
 721         from_mark = parser.get_mark()
 722         parser.next()
 723     if parser.check('merge'):
 724         merge_mark = parser.get_mark()
 725         parser.next()
 726         if parser.check('merge'):
 727             die('octopus merges are not supported yet')
 728
 729     # fast-export adds an extra newline
 730     if data[-1] == '\n':
 731         data = data[:-1]
 732
 733     files = {}
 734
 735     for line in parser:
 736         if parser.check('M'):
 737             t, m, mark_ref, path = line.split(' ', 3)
 738             mark = int(mark_ref[1:])
 739             f = { 'mode' : hgmode(m), 'data' : blob_marks[mark] }
 740         elif parser.check('D'):
 741             t, path = line.split(' ', 1)
 742             f = { 'deleted' : True }
 743         else:
 744             die('Unknown file command: %s' % line)
 745         files[path] = f
 746
 747     # only export the commits if we are on an internal proxy repo
 748     if dry_run and not peer:
 749         parsed_refs[ref] = None
 750         return
 751
 752     def getfilectx(repo, memctx, f):
 753         of = files[f]
 754         if 'deleted' in of:
 755             raise IOError
 756         if 'ctx' in of:
 757             return of['ctx']
 758         is_exec = of['mode'] == 'x'
 759         is_link = of['mode'] == 'l'
 760         rename = of.get('rename', None)
 761         return context.memfilectx(f, of['data'],
 762                 is_link, is_exec, rename)
 763
 764     repo = parser.repo
 765
 766     user, date, tz = author
 767     extra = {}
 768
 769     if committer != author:
 770         extra['committer'] = "%s %u %u" % committer
 771
 772     if from_mark:
 773         p1 = mark_to_rev(from_mark)
 774     else:
 775         p1 = '0' * 40
 776
 777     if merge_mark:
 778         p2 = mark_to_rev(merge_mark)
 779     else:
 780         p2 = '0' * 40
 781
 782     #
 783     # If files changed from any of the parents, hg wants to know, but in git if
 784     # nothing changed from the first parent, nothing changed.
 785     #
 786     if merge_mark:
 787         get_merge_files(repo, p1, p2, files)
 788
 789     # Check if the ref is supposed to be a named branch
 790     if ref.startswith('refs/heads/branches/'):
 791         branch = ref[len('refs/heads/branches/'):]
 792         extra['branch'] = hgref(branch)
 793
 794     if mode == 'hg':
 795         i = data.find('\n--HG--\n')
 796         if i >= 0:
 797             tmp = data[i + len('\n--HG--\n'):].strip()
 798             for k, v in [e.split(' : ', 1) for e in tmp.split('\n')]:
 799                 if k == 'rename':
 800                     old, new = v.split(' => ', 1)
 801                     files[new]['rename'] = old
 802                 elif k == 'branch':
 803                     extra[k] = v
 804                 elif k == 'extra':
 805                     ek, ev = v.split(' : ', 1)
 806                     extra[ek] = urllib.unquote(ev)
 807             data = data[:i]
 808
 809     ctx = context.memctx(repo, (p1, p2), data,
 810             files.keys(), getfilectx,
 811             user, (date, tz), extra)
 812
 813     tmp = encoding.encoding
 814     encoding.encoding = 'utf-8'
 815
 816     node = hghex(repo.commitctx(ctx))
 817
 818     encoding.encoding = tmp
 819
 820     parsed_refs[ref] = node
 821     marks.new_mark(node, commit_mark)
 822
 823 def parse_reset(parser):
 824     ref = parser[1]
 825     parser.next()
 826     # ugh
 827     if parser.check('commit'):
 828         parse_commit(parser)
 829         return
 830     if not parser.check('from'):
 831         return
 832     from_mark = parser.get_mark()
 833     parser.next()
 834
 835     try:
 836         rev = mark_to_rev(from_mark)
 837     except KeyError:
 838         rev = None
 839     parsed_refs[ref] = rev
 840
 841 def parse_tag(parser):
 842     name = parser[1]
 843     parser.next()
 844     from_mark = parser.get_mark()
 845     parser.next()
 846     tagger = parser.get_author()
 847     parser.next()
 848     data = parser.get_data()
 849     parser.next()
 850
 851     parsed_tags[name] = (tagger, data)
 852
 853 def write_tag(repo, tag, node, msg, author):
 854     branch = repo[node].branch()
 855     tip = branch_tip(branch)
 856     tip = repo[tip]
 857
 858     def getfilectx(repo, memctx, f):
 859         try:
 860             fctx = tip.filectx(f)
 861             data = fctx.data()
 862         except error.ManifestLookupError:
 863             data = ""
 864         content = data + "%s %s\n" % (node, tag)
 865         return context.memfilectx(f, content, False, False, None)
 866
 867     p1 = tip.hex()
 868     p2 = '0' * 40
 869     if author:
 870         user, date, tz = author
 871         date_tz = (date, tz)
 872     else:
 873         cmd = ['git', 'var', 'GIT_COMMITTER_IDENT']
 874         process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
 875         output, _ = process.communicate()
 876         m = re.match('^.* <.*>', output)
 877         if m:
 878             user = m.group(0)
 879         else:
 880             user = repo.ui.username()
 881         date_tz = None
 882
 883     ctx = context.memctx(repo, (p1, p2), msg,
 884             ['.hgtags'], getfilectx,
 885             user, date_tz, {'branch' : branch})
 886
 887     tmp = encoding.encoding
 888     encoding.encoding = 'utf-8'
 889
 890     tagnode = repo.commitctx(ctx)
 891
 892     encoding.encoding = tmp
 893
 894     return (tagnode, branch)
 895
 896 def checkheads_bmark(repo, ref, ctx):
 897     bmark = ref[len('refs/heads/'):]
 898     if not bmark in bmarks:
 899         # new bmark
 900         return True
 901
 902     ctx_old = bmarks[bmark]
 903     ctx_new = ctx
 904     if not repo.changelog.descendant(ctx_old.rev(), ctx_new.rev()):
 905         if force_push:
 906             print "ok %s forced update" % ref
 907         else:
 908             print "error %s non-fast forward" % ref
 909             return False
 910
 911     return True
 912
 913 def checkheads(repo, remote, p_revs):
 914
 915     remotemap = remote.branchmap()
 916     if not remotemap:
 917         # empty repo
 918         return True
 919
 920     new = {}
 921     ret = True
 922
 923     for node, ref in p_revs.iteritems():
 924         ctx = repo[node]
 925         branch = ctx.branch()
 926         if not branch in remotemap:
 927             # new branch
 928             continue
 929         if not ref.startswith('refs/heads/branches'):
 930             if ref.startswith('refs/heads/'):
 931                 if not checkheads_bmark(repo, ref, ctx):
 932                     ret = False
 933
 934             # only check branches
 935             continue
 936         new.setdefault(branch, []).append(ctx.rev())
 937
 938     for branch, heads in new.iteritems():
 939         old = [repo.changelog.rev(x) for x in remotemap[branch]]
 940         for rev in heads:
 941             if check_version(2, 3):
 942                 ancestors = repo.changelog.ancestors([rev], stoprev=min(old))
 943             else:
 944                 ancestors = repo.changelog.ancestors(rev)
 945             found = False
 946
 947             for x in old:
 948                 if x in ancestors:
 949                     found = True
 950                     break
 951
 952             if found:
 953                 continue
 954
 955             node = repo.changelog.node(rev)
 956             ref = p_revs[node]
 957             if force_push:
 958                 print "ok %s forced update" % ref
 959             else:
 960                 print "error %s non-fast forward" % ref
 961                 ret = False
 962
 963     return ret
 964
 965 def push_unsafe(repo, remote, parsed_refs, p_revs):
 966
 967     force = force_push
 968
 969     fci = discovery.findcommonincoming
 970     commoninc = fci(repo, remote, force=force)
 971     common, _, remoteheads = commoninc
 972
 973     if not checkheads(repo, remote, p_revs):
 974         return None
 975
 976     cg = repo.getbundle('push', heads=list(p_revs), common=common)
 977
 978     unbundle = remote.capable('unbundle')
 979     if unbundle:
 980         if force:
 981             remoteheads = ['force']
 982         return remote.unbundle(cg, remoteheads, 'push')
 983     else:
 984         return remote.addchangegroup(cg, 'push', repo.url())
 985
 986 def push(repo, remote, parsed_refs, p_revs):
 987     if hasattr(remote, 'canpush') and not remote.canpush():
 988         print "error cannot push"
 989
 990     if not p_revs:
 991         # nothing to push
 992         return
 993
 994     lock = None
 995     unbundle = remote.capable('unbundle')
 996     if not unbundle:
 997         lock = remote.lock()
 998     try:
 999         ret = push_unsafe(repo, remote, parsed_refs, p_revs)
1000     finally:
1001         if lock is not None:
1002             lock.release()
1003
1004     return ret
1005
1006 def check_tip(ref, kind, name, heads):
1007     try:
1008         ename = '%s/%s' % (kind, name)
1009         tip = marks.get_tip(ename)
1010     except KeyError:
1011         return True
1012     else:
1013         return tip in heads
1014
1015 def do_export(parser):
1016     p_bmarks = []
1017     p_revs = {}
1018
1019     parser.next()
1020
1021     for line in parser.each_block('done'):
1022         if parser.check('blob'):
1023             parse_blob(parser)
1024         elif parser.check('commit'):
1025             parse_commit(parser)
1026         elif parser.check('reset'):
1027             parse_reset(parser)
1028         elif parser.check('tag'):
1029             parse_tag(parser)
1030         elif parser.check('feature'):
1031             pass
1032         else:
1033             die('unhandled export command: %s' % line)
1034
1035     need_fetch = False
1036
1037     for ref, node in parsed_refs.iteritems():
1038         bnode = hgbin(node) if node else None
1039         if ref.startswith('refs/heads/branches'):
1040             branch = ref[len('refs/heads/branches/'):]
1041             if branch in branches and bnode in branches[branch]:
1042                 # up to date
1043                 continue
1044
1045             if peer:
1046                 remotemap = peer.branchmap()
1047                 if remotemap and branch in remotemap:
1048                     heads = [hghex(e) for e in remotemap[branch]]
1049                     if not check_tip(ref, 'branches', branch, heads):
1050                         print "error %s fetch first" % ref
1051                         need_fetch = True
1052                         continue
1053
1054             p_revs[bnode] = ref
1055             print "ok %s" % ref
1056         elif ref.startswith('refs/heads/'):
1057             bmark = ref[len('refs/heads/'):]
1058             new = node
1059             old = bmarks[bmark].hex() if bmark in bmarks else ''
1060
1061             if old == new:
1062                 continue
1063
1064             print "ok %s" % ref
1065             if bmark != fake_bmark and \
1066                     not (bmark == 'master' and bmark not in parser.repo._bookmarks):
1067                 p_bmarks.append((ref, bmark, old, new))
1068
1069             if peer:
1070                 remote_old = peer.listkeys('bookmarks').get(bmark)
1071                 if remote_old:
1072                     if not check_tip(ref, 'bookmarks', bmark, remote_old):
1073                         print "error %s fetch first" % ref
1074                         need_fetch = True
1075                         continue
1076
1077             p_revs[bnode] = ref
1078         elif ref.startswith('refs/tags/'):
1079             if dry_run:
1080                 print "ok %s" % ref
1081                 continue
1082             tag = ref[len('refs/tags/'):]
1083             tag = hgref(tag)
1084             author, msg = parsed_tags.get(tag, (None, None))
1085             if mode == 'git':
1086                 if not msg:
1087                     msg = 'Added tag %s for changeset %s' % (tag, node[:12])
1088                 tagnode, branch = write_tag(parser.repo, tag, node, msg, author)
1089                 p_revs[tagnode] = 'refs/heads/branches/' + gitref(branch)
1090             else:
1091                 fp = parser.repo.opener('localtags', 'a')
1092                 fp.write('%s %s\n' % (node, tag))
1093                 fp.close()
1094             p_revs[bnode] = ref
1095             print "ok %s" % ref
1096         else:
1097             # transport-helper/fast-export bugs
1098             continue
1099
1100     if need_fetch:
1101         print
1102         return
1103
1104     if dry_run:
1105         if peer and not force_push:
1106             checkheads(parser.repo, peer, p_revs)
1107         print
1108         return
1109
1110     if peer:
1111         if not push(parser.repo, peer, parsed_refs, p_revs):
1112             # do not update bookmarks
1113             print
1114             return
1115
1116         # update remote bookmarks
1117         remote_bmarks = peer.listkeys('bookmarks')
1118         for ref, bmark, old, new in p_bmarks:
1119             if force_push:
1120                 old = remote_bmarks.get(bmark, '')
1121             if not peer.pushkey('bookmarks', bmark, old, new):
1122                 print "error %s" % ref
1123     else:
1124         # update local bookmarks
1125         for ref, bmark, old, new in p_bmarks:
1126             if not bookmarks.pushbookmark(parser.repo, bmark, old, new):
1127                 print "error %s" % ref
1128
1129     print
1130
1131 def do_option(parser):
1132     global dry_run, force_push
1133     _, key, value = parser.line.split(' ')
1134     if key == 'dry-run':
1135         dry_run = (value == 'true')
1136         print 'ok'
1137     elif key == 'force':
1138         force_push = (value == 'true')
1139         print 'ok'
1140     else:
1141         print 'unsupported'
1142
1143 def fix_path(alias, repo, orig_url):
1144     url = urlparse.urlparse(orig_url, 'file')
1145     if url.scheme != 'file' or os.path.isabs(os.path.expanduser(url.path)):
1146         return
1147     abs_url = urlparse.urljoin("%s/" % os.getcwd(), orig_url)
1148     cmd = ['git', 'config', 'remote.%s.url' % alias, "hg::%s" % abs_url]
1149     subprocess.call(cmd)
1150
1151 def main(args):
1152     global prefix, gitdir, dirname, branches, bmarks
1153     global marks, blob_marks, parsed_refs
1154     global peer, mode, bad_mail, bad_name
1155     global track_branches, force_push, is_tmp
1156     global parsed_tags
1157     global filenodes
1158     global fake_bmark, hg_version
1159     global dry_run
1160     global notes, alias
1161
1162     alias = args[1]
1163     url = args[2]
1164     peer = None
1165
1166     hg_git_compat = get_config_bool('remote-hg.hg-git-compat')
1167     track_branches = get_config_bool('remote-hg.track-branches', True)
1168     force_push = False
1169
1170     if hg_git_compat:
1171         mode = 'hg'
1172         bad_mail = 'none@none'
1173         bad_name = ''
1174     else:
1175         mode = 'git'
1176         bad_mail = 'unknown'
1177         bad_name = 'Unknown'
1178
1179     if alias[4:] == url:
1180         is_tmp = True
1181         alias = hashlib.sha1(alias).hexdigest()
1182     else:
1183         is_tmp = False
1184
1185     gitdir = os.environ['GIT_DIR']
1186     dirname = os.path.join(gitdir, 'hg', alias)
1187     branches = {}
1188     bmarks = {}
1189     blob_marks = {}
1190     parsed_refs = {}
1191     marks = None
1192     parsed_tags = {}
1193     filenodes = {}
1194     fake_bmark = None
1195     try:
1196         hg_version = tuple(int(e) for e in util.version().split('.'))
1197     except:
1198         hg_version = None
1199     dry_run = False
1200     notes = set()
1201
1202     repo = get_repo(url, alias)
1203     prefix = 'refs/hg/%s' % alias
1204
1205     if not is_tmp:
1206         fix_path(alias, peer or repo, url)
1207
1208     marks_path = os.path.join(dirname, 'marks-hg')
1209     marks = Marks(marks_path, repo)
1210
1211     if sys.platform == 'win32':
1212         import msvcrt
1213         msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
1214
1215     parser = Parser(repo)
1216     for line in parser:
1217         if parser.check('capabilities'):
1218             do_capabilities(parser)
1219         elif parser.check('list'):
1220             do_list(parser)
1221         elif parser.check('import'):
1222             do_import(parser)
1223         elif parser.check('export'):
1224             do_export(parser)
1225         elif parser.check('option'):
1226             do_option(parser)
1227         else:
1228             die('unhandled command: %s' % line)
1229         sys.stdout.flush()
1230
1231 def bye():
1232     if not marks:
1233         return
1234     if not is_tmp:
1235         marks.store()
1236     else:
1237         shutil.rmtree(dirname)
1238
1239 atexit.register(bye)
1240 sys.exit(main(sys.argv))