Andrew's git - gitweb.git/blob - 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
  15from mercurial import hg, ui, bookmarks, context, util, encoding, node, error
  16
  17import re
  18import sys
  19import os
  20import json
  21import shutil
  22import subprocess
  23import urllib
  24import atexit
  25
  26#
  27# If you want to switch to hg-git compatibility mode:
  28# git config --global remote-hg.hg-git-compat true
  29#
  30# If you are not in hg-git-compat mode and want to disable the tracking of
  31# named branches:
  32# git config --global remote-hg.track-branches false
  33#
  34# If you don't want to force pushes (and thus risk creating new remote heads):
  35# git config --global remote-hg.force-push false
  36#
  37# If you want the equivalent of hg's clone/pull--insecure option:
  38# git config remote-hg.insecure true
  39#
  40# git:
  41# Sensible defaults for git.
  42# hg bookmarks are exported as git branches, hg branches are prefixed
  43# with 'branches/', HEAD is a special case.
  44#
  45# hg:
  46# Emulate hg-git.
  47# Only hg bookmarks are exported as git branches.
  48# Commits are modified to preserve hg information and allow bidirectionality.
  49#
  50
  51NAME_RE = re.compile('^([^<>]+)')
  52AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  53AUTHOR_HG_RE = re.compile('^(.*?) ?<(.*?)(?:>(.+)?)?$')
  54RAW_AUTHOR_RE = re.compile('^(\w+) (?:(.+)? )?<(.*)> (\d+) ([+-]\d+)')
  55
  56def die(msg, *args):
  57    sys.stderr.write('ERROR: %s\n' % (msg % args))
  58    sys.exit(1)
  59
  60def warn(msg, *args):
  61    sys.stderr.write('WARNING: %s\n' % (msg % args))
  62
  63def gitmode(flags):
  64    return 'l' in flags and '120000' or 'x' in flags and '100755' or '100644'
  65
  66def gittz(tz):
  67    return '%+03d%02d' % (-tz / 3600, -tz % 3600 / 60)
  68
  69def hgmode(mode):
  70    m = { '100755': 'x', '120000': 'l' }
  71    return m.get(mode, '')
  72
  73def hghex(node):
  74    return hg.node.hex(node)
  75
  76def get_config(config):
  77    cmd = ['git', 'config', '--get', config]
  78    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  79    output, _ = process.communicate()
  80    return output
  81
  82class Marks:
  83
  84    def __init__(self, path):
  85        self.path = path
  86        self.tips = {}
  87        self.marks = {}
  88        self.rev_marks = {}
  89        self.last_mark = 0
  90
  91        self.load()
  92
  93    def load(self):
  94        if not os.path.exists(self.path):
  95            return
  96
  97        tmp = json.load(open(self.path))
  98
  99        self.tips = tmp['tips']
 100        self.marks = tmp['marks']
 101        self.last_mark = tmp['last-mark']
 102
 103        for rev, mark in self.marks.iteritems():
 104            self.rev_marks[mark] = int(rev)
 105
 106    def dict(self):
 107        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
 108
 109    def store(self):
 110        json.dump(self.dict(), open(self.path, 'w'))
 111
 112    def __str__(self):
 113        return str(self.dict())
 114
 115    def from_rev(self, rev):
 116        return self.marks[str(rev)]
 117
 118    def to_rev(self, mark):
 119        return self.rev_marks[mark]
 120
 121    def get_mark(self, rev):
 122        self.last_mark += 1
 123        self.marks[str(rev)] = self.last_mark
 124        return self.last_mark
 125
 126    def new_mark(self, rev, mark):
 127        self.marks[str(rev)] = mark
 128        self.rev_marks[mark] = rev
 129        self.last_mark = mark
 130
 131    def is_marked(self, rev):
 132        return self.marks.has_key(str(rev))
 133
 134    def get_tip(self, branch):
 135        return self.tips.get(branch, 0)
 136
 137    def set_tip(self, branch, tip):
 138        self.tips[branch] = tip
 139
 140class Parser:
 141
 142    def __init__(self, repo):
 143        self.repo = repo
 144        self.line = self.get_line()
 145
 146    def get_line(self):
 147        return sys.stdin.readline().strip()
 148
 149    def __getitem__(self, i):
 150        return self.line.split()[i]
 151
 152    def check(self, word):
 153        return self.line.startswith(word)
 154
 155    def each_block(self, separator):
 156        while self.line != separator:
 157            yield self.line
 158            self.line = self.get_line()
 159
 160    def __iter__(self):
 161        return self.each_block('')
 162
 163    def next(self):
 164        self.line = self.get_line()
 165        if self.line == 'done':
 166            self.line = None
 167
 168    def get_mark(self):
 169        i = self.line.index(':') + 1
 170        return int(self.line[i:])
 171
 172    def get_data(self):
 173        if not self.check('data'):
 174            return None
 175        i = self.line.index(' ') + 1
 176        size = int(self.line[i:])
 177        return sys.stdin.read(size)
 178
 179    def get_author(self):
 180        global bad_mail
 181
 182        ex = None
 183        m = RAW_AUTHOR_RE.match(self.line)
 184        if not m:
 185            return None
 186        _, name, email, date, tz = m.groups()
 187        if name and 'ext:' in name:
 188            m = re.match('^(.+?) ext:\((.+)\)$', name)
 189            if m:
 190                name = m.group(1)
 191                ex = urllib.unquote(m.group(2))
 192
 193        if email != bad_mail:
 194            if name:
 195                user = '%s <%s>' % (name, email)
 196            else:
 197                user = '<%s>' % (email)
 198        else:
 199            user = name
 200
 201        if ex:
 202            user += ex
 203
 204        tz = int(tz)
 205        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 206        return (user, int(date), -tz)
 207
 208def fix_file_path(path):
 209    if not os.path.isabs(path):
 210        return path
 211    return os.path.relpath(path, '/')
 212
 213def export_file(fc):
 214    d = fc.data()
 215    path = fix_file_path(fc.path())
 216    print "M %s inline %s" % (gitmode(fc.flags()), path)
 217    print "data %d" % len(d)
 218    print d
 219
 220def get_filechanges(repo, ctx, parent):
 221    modified = set()
 222    added = set()
 223    removed = set()
 224
 225    cur = ctx.manifest()
 226    prev = repo[parent].manifest().copy()
 227
 228    for fn in cur:
 229        if fn in prev:
 230            if (cur.flags(fn) != prev.flags(fn) or cur[fn] != prev[fn]):
 231                modified.add(fn)
 232            del prev[fn]
 233        else:
 234            added.add(fn)
 235    removed |= set(prev.keys())
 236
 237    return added | modified, removed
 238
 239def fixup_user_git(user):
 240    name = mail = None
 241    user = user.replace('"', '')
 242    m = AUTHOR_RE.match(user)
 243    if m:
 244        name = m.group(1)
 245        mail = m.group(2).strip()
 246    else:
 247        m = NAME_RE.match(user)
 248        if m:
 249            name = m.group(1).strip()
 250    return (name, mail)
 251
 252def fixup_user_hg(user):
 253    def sanitize(name):
 254        # stole this from hg-git
 255        return re.sub('[<>\n]', '?', name.lstrip('< ').rstrip('> '))
 256
 257    m = AUTHOR_HG_RE.match(user)
 258    if m:
 259        name = sanitize(m.group(1))
 260        mail = sanitize(m.group(2))
 261        ex = m.group(3)
 262        if ex:
 263            name += ' ext:(' + urllib.quote(ex) + ')'
 264    else:
 265        name = sanitize(user)
 266        if '@' in user:
 267            mail = name
 268        else:
 269            mail = None
 270
 271    return (name, mail)
 272
 273def fixup_user(user):
 274    global mode, bad_mail
 275
 276    if mode == 'git':
 277        name, mail = fixup_user_git(user)
 278    else:
 279        name, mail = fixup_user_hg(user)
 280
 281    if not name:
 282        name = bad_name
 283    if not mail:
 284        mail = bad_mail
 285
 286    return '%s <%s>' % (name, mail)
 287
 288def get_repo(url, alias):
 289    global dirname, peer
 290
 291    myui = ui.ui()
 292    myui.setconfig('ui', 'interactive', 'off')
 293    myui.fout = sys.stderr
 294
 295    try:
 296        if get_config('remote-hg.insecure') == 'true\n':
 297            myui.setconfig('web', 'cacerts', '')
 298    except subprocess.CalledProcessError:
 299        pass
 300
 301    if hg.islocal(url):
 302        repo = hg.repository(myui, url)
 303    else:
 304        local_path = os.path.join(dirname, 'clone')
 305        if not os.path.exists(local_path):
 306            try:
 307                peer, dstpeer = hg.clone(myui, {}, url, local_path, update=True, pull=True)
 308            except:
 309                die('Repository error')
 310            repo = dstpeer.local()
 311        else:
 312            repo = hg.repository(myui, local_path)
 313            try:
 314                peer = hg.peer(myui, {}, url)
 315            except:
 316                die('Repository error')
 317            repo.pull(peer, heads=None, force=True)
 318
 319    return repo
 320
 321def rev_to_mark(rev):
 322    global marks
 323    return marks.from_rev(rev)
 324
 325def mark_to_rev(mark):
 326    global marks
 327    return marks.to_rev(mark)
 328
 329def export_ref(repo, name, kind, head):
 330    global prefix, marks, mode
 331
 332    ename = '%s/%s' % (kind, name)
 333    tip = marks.get_tip(ename)
 334
 335    # mercurial takes too much time checking this
 336    if tip and tip == head.rev():
 337        # nothing to do
 338        return
 339    revs = xrange(tip, head.rev() + 1)
 340    count = 0
 341
 342    revs = [rev for rev in revs if not marks.is_marked(rev)]
 343
 344    for rev in revs:
 345
 346        c = repo[rev]
 347        (manifest, user, (time, tz), files, desc, extra) = repo.changelog.read(c.node())
 348        rev_branch = extra['branch']
 349
 350        author = "%s %d %s" % (fixup_user(user), time, gittz(tz))
 351        if 'committer' in extra:
 352            user, time, tz = extra['committer'].rsplit(' ', 2)
 353            committer = "%s %s %s" % (user, time, gittz(int(tz)))
 354        else:
 355            committer = author
 356
 357        parents = [p for p in repo.changelog.parentrevs(rev) if p >= 0]
 358
 359        if len(parents) == 0:
 360            modified = c.manifest().keys()
 361            removed = []
 362        else:
 363            modified, removed = get_filechanges(repo, c, parents[0])
 364
 365        if mode == 'hg':
 366            extra_msg = ''
 367
 368            if rev_branch != 'default':
 369                extra_msg += 'branch : %s\n' % rev_branch
 370
 371            renames = []
 372            for f in c.files():
 373                if f not in c.manifest():
 374                    continue
 375                rename = c.filectx(f).renamed()
 376                if rename:
 377                    renames.append((rename[0], f))
 378
 379            for e in renames:
 380                extra_msg += "rename : %s => %s\n" % e
 381
 382            for key, value in extra.iteritems():
 383                if key in ('author', 'committer', 'encoding', 'message', 'branch', 'hg-git'):
 384                    continue
 385                else:
 386                    extra_msg += "extra : %s : %s\n" % (key, urllib.quote(value))
 387
 388            desc += '\n'
 389            if extra_msg:
 390                desc += '\n--HG--\n' + extra_msg
 391
 392        if len(parents) == 0 and rev:
 393            print 'reset %s/%s' % (prefix, ename)
 394
 395        print "commit %s/%s" % (prefix, ename)
 396        print "mark :%d" % (marks.get_mark(rev))
 397        print "author %s" % (author)
 398        print "committer %s" % (committer)
 399        print "data %d" % (len(desc))
 400        print desc
 401
 402        if len(parents) > 0:
 403            print "from :%s" % (rev_to_mark(parents[0]))
 404            if len(parents) > 1:
 405                print "merge :%s" % (rev_to_mark(parents[1]))
 406
 407        for f in modified:
 408            export_file(c.filectx(f))
 409        for f in removed:
 410            print "D %s" % (fix_file_path(f))
 411        print
 412
 413        count += 1
 414        if (count % 100 == 0):
 415            print "progress revision %d '%s' (%d/%d)" % (rev, name, count, len(revs))
 416            print "#############################################################"
 417
 418    # make sure the ref is updated
 419    print "reset %s/%s" % (prefix, ename)
 420    print "from :%u" % rev_to_mark(rev)
 421    print
 422
 423    marks.set_tip(ename, rev)
 424
 425def export_tag(repo, tag):
 426    export_ref(repo, tag, 'tags', repo[tag])
 427
 428def export_bookmark(repo, bmark):
 429    head = bmarks[bmark]
 430    export_ref(repo, bmark, 'bookmarks', head)
 431
 432def export_branch(repo, branch):
 433    tip = get_branch_tip(repo, branch)
 434    head = repo[tip]
 435    export_ref(repo, branch, 'branches', head)
 436
 437def export_head(repo):
 438    global g_head
 439    export_ref(repo, g_head[0], 'bookmarks', g_head[1])
 440
 441def do_capabilities(parser):
 442    global prefix, dirname
 443
 444    print "import"
 445    print "export"
 446    print "refspec refs/heads/branches/*:%s/branches/*" % prefix
 447    print "refspec refs/heads/*:%s/bookmarks/*" % prefix
 448    print "refspec refs/tags/*:%s/tags/*" % prefix
 449
 450    path = os.path.join(dirname, 'marks-git')
 451
 452    if os.path.exists(path):
 453        print "*import-marks %s" % path
 454    print "*export-marks %s" % path
 455
 456    print
 457
 458def get_branch_tip(repo, branch):
 459    global branches
 460
 461    heads = branches.get(branch, None)
 462    if not heads:
 463        return None
 464
 465    # verify there's only one head
 466    if (len(heads) > 1):
 467        warn("Branch '%s' has more than one head, consider merging" % branch)
 468        # older versions of mercurial don't have this
 469        if hasattr(repo, "branchtip"):
 470            return repo.branchtip(branch)
 471
 472    return heads[0]
 473
 474def list_head(repo, cur):
 475    global g_head, bmarks
 476
 477    head = bookmarks.readcurrent(repo)
 478    if head:
 479        node = repo[head]
 480    else:
 481        # fake bookmark from current branch
 482        head = cur
 483        node = repo['.']
 484        if not node:
 485            node = repo['tip']
 486        if not node:
 487            return
 488        if head == 'default':
 489            head = 'master'
 490        bmarks[head] = node
 491
 492    print "@refs/heads/%s HEAD" % head
 493    g_head = (head, node)
 494
 495def do_list(parser):
 496    global branches, bmarks, mode, track_branches
 497
 498    repo = parser.repo
 499    for bmark, node in bookmarks.listbookmarks(repo).iteritems():
 500        bmarks[bmark] = repo[node]
 501
 502    cur = repo.dirstate.branch()
 503
 504    list_head(repo, cur)
 505
 506    if track_branches:
 507        for branch in repo.branchmap():
 508            heads = repo.branchheads(branch)
 509            if len(heads):
 510                branches[branch] = heads
 511
 512        for branch in branches:
 513            print "? refs/heads/branches/%s" % branch
 514
 515    for bmark in bmarks:
 516        print "? refs/heads/%s" % bmark
 517
 518    for tag, node in repo.tagslist():
 519        if tag == 'tip':
 520            continue
 521        print "? refs/tags/%s" % tag
 522
 523    print
 524
 525def do_import(parser):
 526    repo = parser.repo
 527
 528    path = os.path.join(dirname, 'marks-git')
 529
 530    print "feature done"
 531    if os.path.exists(path):
 532        print "feature import-marks=%s" % path
 533    print "feature export-marks=%s" % path
 534    sys.stdout.flush()
 535
 536    tmp = encoding.encoding
 537    encoding.encoding = 'utf-8'
 538
 539    # lets get all the import lines
 540    while parser.check('import'):
 541        ref = parser[1]
 542
 543        if (ref == 'HEAD'):
 544            export_head(repo)
 545        elif ref.startswith('refs/heads/branches/'):
 546            branch = ref[len('refs/heads/branches/'):]
 547            export_branch(repo, branch)
 548        elif ref.startswith('refs/heads/'):
 549            bmark = ref[len('refs/heads/'):]
 550            export_bookmark(repo, bmark)
 551        elif ref.startswith('refs/tags/'):
 552            tag = ref[len('refs/tags/'):]
 553            export_tag(repo, tag)
 554
 555        parser.next()
 556
 557    encoding.encoding = tmp
 558
 559    print 'done'
 560
 561def parse_blob(parser):
 562    global blob_marks
 563
 564    parser.next()
 565    mark = parser.get_mark()
 566    parser.next()
 567    data = parser.get_data()
 568    blob_marks[mark] = data
 569    parser.next()
 570
 571def get_merge_files(repo, p1, p2, files):
 572    for e in repo[p1].files():
 573        if e not in files:
 574            if e not in repo[p1].manifest():
 575                continue
 576            f = { 'ctx' : repo[p1][e] }
 577            files[e] = f
 578
 579def parse_commit(parser):
 580    global marks, blob_marks, parsed_refs
 581    global mode
 582
 583    from_mark = merge_mark = None
 584
 585    ref = parser[1]
 586    parser.next()
 587
 588    commit_mark = parser.get_mark()
 589    parser.next()
 590    author = parser.get_author()
 591    parser.next()
 592    committer = parser.get_author()
 593    parser.next()
 594    data = parser.get_data()
 595    parser.next()
 596    if parser.check('from'):
 597        from_mark = parser.get_mark()
 598        parser.next()
 599    if parser.check('merge'):
 600        merge_mark = parser.get_mark()
 601        parser.next()
 602        if parser.check('merge'):
 603            die('octopus merges are not supported yet')
 604
 605    files = {}
 606
 607    for line in parser:
 608        if parser.check('M'):
 609            t, m, mark_ref, path = line.split(' ', 3)
 610            mark = int(mark_ref[1:])
 611            f = { 'mode' : hgmode(m), 'data' : blob_marks[mark] }
 612        elif parser.check('D'):
 613            t, path = line.split(' ', 1)
 614            f = { 'deleted' : True }
 615        else:
 616            die('Unknown file command: %s' % line)
 617        files[path] = f
 618
 619    def getfilectx(repo, memctx, f):
 620        of = files[f]
 621        if 'deleted' in of:
 622            raise IOError
 623        if 'ctx' in of:
 624            return of['ctx']
 625        is_exec = of['mode'] == 'x'
 626        is_link = of['mode'] == 'l'
 627        rename = of.get('rename', None)
 628        return context.memfilectx(f, of['data'],
 629                is_link, is_exec, rename)
 630
 631    repo = parser.repo
 632
 633    user, date, tz = author
 634    extra = {}
 635
 636    if committer != author:
 637        extra['committer'] = "%s %u %u" % committer
 638
 639    if from_mark:
 640        p1 = repo.changelog.node(mark_to_rev(from_mark))
 641    else:
 642        p1 = '\0' * 20
 643
 644    if merge_mark:
 645        p2 = repo.changelog.node(mark_to_rev(merge_mark))
 646    else:
 647        p2 = '\0' * 20
 648
 649    #
 650    # If files changed from any of the parents, hg wants to know, but in git if
 651    # nothing changed from the first parent, nothing changed.
 652    #
 653    if merge_mark:
 654        get_merge_files(repo, p1, p2, files)
 655
 656    # Check if the ref is supposed to be a named branch
 657    if ref.startswith('refs/heads/branches/'):
 658        extra['branch'] = ref[len('refs/heads/branches/'):]
 659
 660    if mode == 'hg':
 661        i = data.find('\n--HG--\n')
 662        if i >= 0:
 663            tmp = data[i + len('\n--HG--\n'):].strip()
 664            for k, v in [e.split(' : ', 1) for e in tmp.split('\n')]:
 665                if k == 'rename':
 666                    old, new = v.split(' => ', 1)
 667                    files[new]['rename'] = old
 668                elif k == 'branch':
 669                    extra[k] = v
 670                elif k == 'extra':
 671                    ek, ev = v.split(' : ', 1)
 672                    extra[ek] = urllib.unquote(ev)
 673            data = data[:i]
 674
 675    ctx = context.memctx(repo, (p1, p2), data,
 676            files.keys(), getfilectx,
 677            user, (date, tz), extra)
 678
 679    tmp = encoding.encoding
 680    encoding.encoding = 'utf-8'
 681
 682    node = repo.commitctx(ctx)
 683
 684    encoding.encoding = tmp
 685
 686    rev = repo[node].rev()
 687
 688    parsed_refs[ref] = node
 689    marks.new_mark(rev, commit_mark)
 690
 691def parse_reset(parser):
 692    global parsed_refs
 693
 694    ref = parser[1]
 695    parser.next()
 696    # ugh
 697    if parser.check('commit'):
 698        parse_commit(parser)
 699        return
 700    if not parser.check('from'):
 701        return
 702    from_mark = parser.get_mark()
 703    parser.next()
 704
 705    node = parser.repo.changelog.node(mark_to_rev(from_mark))
 706    parsed_refs[ref] = node
 707
 708def parse_tag(parser):
 709    name = parser[1]
 710    parser.next()
 711    from_mark = parser.get_mark()
 712    parser.next()
 713    tagger = parser.get_author()
 714    parser.next()
 715    data = parser.get_data()
 716    parser.next()
 717
 718    # nothing to do
 719
 720def do_export(parser):
 721    global parsed_refs, bmarks, peer
 722
 723    p_bmarks = []
 724
 725    parser.next()
 726
 727    for line in parser.each_block('done'):
 728        if parser.check('blob'):
 729            parse_blob(parser)
 730        elif parser.check('commit'):
 731            parse_commit(parser)
 732        elif parser.check('reset'):
 733            parse_reset(parser)
 734        elif parser.check('tag'):
 735            parse_tag(parser)
 736        elif parser.check('feature'):
 737            pass
 738        else:
 739            die('unhandled export command: %s' % line)
 740
 741    for ref, node in parsed_refs.iteritems():
 742        if ref.startswith('refs/heads/branches'):
 743            print "ok %s" % ref
 744        elif ref.startswith('refs/heads/'):
 745            bmark = ref[len('refs/heads/'):]
 746            p_bmarks.append((bmark, node))
 747            continue
 748        elif ref.startswith('refs/tags/'):
 749            tag = ref[len('refs/tags/'):]
 750            if mode == 'git':
 751                msg = 'Added tag %s for changeset %s' % (tag, hghex(node[:6]));
 752                parser.repo.tag([tag], node, msg, False, None, {})
 753            else:
 754                parser.repo.tag([tag], node, None, True, None, {})
 755            print "ok %s" % ref
 756        else:
 757            # transport-helper/fast-export bugs
 758            continue
 759
 760    if peer:
 761        parser.repo.push(peer, force=force_push)
 762
 763    # handle bookmarks
 764    for bmark, node in p_bmarks:
 765        ref = 'refs/heads/' + bmark
 766        new = hghex(node)
 767
 768        if bmark in bmarks:
 769            old = bmarks[bmark].hex()
 770        else:
 771            old = ''
 772
 773        if bmark == 'master' and 'master' not in parser.repo._bookmarks:
 774            # fake bookmark
 775            pass
 776        elif bookmarks.pushbookmark(parser.repo, bmark, old, new):
 777            # updated locally
 778            pass
 779        else:
 780            print "error %s" % ref
 781            continue
 782
 783        if peer:
 784            if not peer.pushkey('bookmarks', bmark, old, new):
 785                print "error %s" % ref
 786                continue
 787
 788        print "ok %s" % ref
 789
 790    print
 791
 792def fix_path(alias, repo, orig_url):
 793    repo_url = util.url(repo.url())
 794    url = util.url(orig_url)
 795    if str(url) == str(repo_url):
 796        return
 797    cmd = ['git', 'config', 'remote.%s.url' % alias, "hg::%s" % repo_url]
 798    subprocess.call(cmd)
 799
 800def main(args):
 801    global prefix, dirname, branches, bmarks
 802    global marks, blob_marks, parsed_refs
 803    global peer, mode, bad_mail, bad_name
 804    global track_branches, force_push, is_tmp
 805
 806    alias = args[1]
 807    url = args[2]
 808    peer = None
 809
 810    hg_git_compat = False
 811    track_branches = True
 812    force_push = True
 813
 814    try:
 815        if get_config('remote-hg.hg-git-compat') == 'true\n':
 816            hg_git_compat = True
 817            track_branches = False
 818        if get_config('remote-hg.track-branches') == 'false\n':
 819            track_branches = False
 820        if get_config('remote-hg.force-push') == 'false\n':
 821            force_push = False
 822    except subprocess.CalledProcessError:
 823        pass
 824
 825    if hg_git_compat:
 826        mode = 'hg'
 827        bad_mail = 'none@none'
 828        bad_name = ''
 829    else:
 830        mode = 'git'
 831        bad_mail = 'unknown'
 832        bad_name = 'Unknown'
 833
 834    if alias[4:] == url:
 835        is_tmp = True
 836        alias = util.sha1(alias).hexdigest()
 837    else:
 838        is_tmp = False
 839
 840    gitdir = os.environ['GIT_DIR']
 841    dirname = os.path.join(gitdir, 'hg', alias)
 842    branches = {}
 843    bmarks = {}
 844    blob_marks = {}
 845    parsed_refs = {}
 846    marks = None
 847
 848    repo = get_repo(url, alias)
 849    prefix = 'refs/hg/%s' % alias
 850
 851    if not is_tmp:
 852        fix_path(alias, peer or repo, url)
 853
 854    if not os.path.exists(dirname):
 855        os.makedirs(dirname)
 856
 857    marks_path = os.path.join(dirname, 'marks-hg')
 858    marks = Marks(marks_path)
 859
 860    parser = Parser(repo)
 861    for line in parser:
 862        if parser.check('capabilities'):
 863            do_capabilities(parser)
 864        elif parser.check('list'):
 865            do_list(parser)
 866        elif parser.check('import'):
 867            do_import(parser)
 868        elif parser.check('export'):
 869            do_export(parser)
 870        else:
 871            die('unhandled command: %s' % line)
 872        sys.stdout.flush()
 873
 874def bye():
 875    if not marks:
 876        return
 877    if not is_tmp:
 878        marks.store()
 879    else:
 880        shutil.rmtree(dirname)
 881
 882atexit.register(bye)
 883sys.exit(main(sys.argv))