Andrew's git - gitweb.git/blob - 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
  17import sys
  18
  19import bzrlib
  20if hasattr(bzrlib, "initialize"):
  21    bzrlib.initialize()
  22
  23import bzrlib.plugin
  24bzrlib.plugin.load_plugins()
  25
  26import bzrlib.generate_ids
  27import bzrlib.transport
  28
  29import sys
  30import os
  31import json
  32import re
  33import StringIO
  34
  35NAME_RE = re.compile('^([^<>]+)')
  36AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  37RAW_AUTHOR_RE = re.compile('^(\w+) (.+)? <(.*)> (\d+) ([+-]\d+)')
  38
  39def die(msg, *args):
  40    sys.stderr.write('ERROR: %s\n' % (msg % args))
  41    sys.exit(1)
  42
  43def warn(msg, *args):
  44    sys.stderr.write('WARNING: %s\n' % (msg % args))
  45
  46def gittz(tz):
  47    return '%+03d%02d' % (tz / 3600, tz % 3600 / 60)
  48
  49class Marks:
  50
  51    def __init__(self, path):
  52        self.path = path
  53        self.tips = {}
  54        self.marks = {}
  55        self.rev_marks = {}
  56        self.last_mark = 0
  57        self.load()
  58
  59    def load(self):
  60        if not os.path.exists(self.path):
  61            return
  62
  63        tmp = json.load(open(self.path))
  64        self.tips = tmp['tips']
  65        self.marks = tmp['marks']
  66        self.last_mark = tmp['last-mark']
  67
  68        for rev, mark in self.marks.iteritems():
  69            self.rev_marks[mark] = rev
  70
  71    def dict(self):
  72        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
  73
  74    def store(self):
  75        json.dump(self.dict(), open(self.path, 'w'))
  76
  77    def __str__(self):
  78        return str(self.dict())
  79
  80    def from_rev(self, rev):
  81        return self.marks[rev]
  82
  83    def to_rev(self, mark):
  84        return self.rev_marks[mark]
  85
  86    def next_mark(self):
  87        self.last_mark += 1
  88        return self.last_mark
  89
  90    def get_mark(self, rev):
  91        self.last_mark += 1
  92        self.marks[rev] = self.last_mark
  93        return self.last_mark
  94
  95    def is_marked(self, rev):
  96        return self.marks.has_key(rev)
  97
  98    def new_mark(self, rev, mark):
  99        self.marks[rev] = mark
 100        self.rev_marks[mark] = rev
 101        self.last_mark = mark
 102
 103    def get_tip(self, branch):
 104        return self.tips.get(branch, None)
 105
 106    def set_tip(self, branch, tip):
 107        self.tips[branch] = tip
 108
 109class Parser:
 110
 111    def __init__(self, repo):
 112        self.repo = repo
 113        self.line = self.get_line()
 114
 115    def get_line(self):
 116        return sys.stdin.readline().strip()
 117
 118    def __getitem__(self, i):
 119        return self.line.split()[i]
 120
 121    def check(self, word):
 122        return self.line.startswith(word)
 123
 124    def each_block(self, separator):
 125        while self.line != separator:
 126            yield self.line
 127            self.line = self.get_line()
 128
 129    def __iter__(self):
 130        return self.each_block('')
 131
 132    def next(self):
 133        self.line = self.get_line()
 134        if self.line == 'done':
 135            self.line = None
 136
 137    def get_mark(self):
 138        i = self.line.index(':') + 1
 139        return int(self.line[i:])
 140
 141    def get_data(self):
 142        if not self.check('data'):
 143            return None
 144        i = self.line.index(' ') + 1
 145        size = int(self.line[i:])
 146        return sys.stdin.read(size)
 147
 148    def get_author(self):
 149        m = RAW_AUTHOR_RE.match(self.line)
 150        if not m:
 151            return None
 152        _, name, email, date, tz = m.groups()
 153        committer = '%s <%s>' % (name, email)
 154        tz = int(tz)
 155        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 156        return (committer, int(date), tz)
 157
 158def rev_to_mark(rev):
 159    global marks
 160    return marks.from_rev(rev)
 161
 162def mark_to_rev(mark):
 163    global marks
 164    return marks.to_rev(mark)
 165
 166def fixup_user(user):
 167    name = mail = None
 168    user = user.replace('"', '')
 169    m = AUTHOR_RE.match(user)
 170    if m:
 171        name = m.group(1)
 172        mail = m.group(2).strip()
 173    else:
 174        m = NAME_RE.match(user)
 175        if m:
 176            name = m.group(1).strip()
 177
 178    return '%s <%s>' % (name, mail)
 179
 180def get_filechanges(cur, prev):
 181    modified = {}
 182    removed = {}
 183
 184    changes = cur.changes_from(prev)
 185
 186    def u(s):
 187        return s.encode('utf-8')
 188
 189    for path, fid, kind in changes.added:
 190        modified[u(path)] = fid
 191    for path, fid, kind in changes.removed:
 192        removed[u(path)] = None
 193    for path, fid, kind, mod, _ in changes.modified:
 194        modified[u(path)] = fid
 195    for oldpath, newpath, fid, kind, mod, _ in changes.renamed:
 196        removed[u(oldpath)] = None
 197        if kind == 'directory':
 198            lst = cur.list_files(from_dir=newpath, recursive=True)
 199            for path, file_class, kind, fid, entry in lst:
 200                if kind != 'directory':
 201                    modified[u(newpath + '/' + path)] = fid
 202        else:
 203            modified[u(newpath)] = fid
 204
 205    return modified, removed
 206
 207def export_files(tree, files):
 208    global marks, filenodes
 209
 210    final = []
 211    for path, fid in files.iteritems():
 212        kind = tree.kind(fid)
 213
 214        h = tree.get_file_sha1(fid)
 215
 216        if kind == 'symlink':
 217            d = tree.get_symlink_target(fid)
 218            mode = '120000'
 219        elif kind == 'file':
 220
 221            if tree.is_executable(fid):
 222                mode = '100755'
 223            else:
 224                mode = '100644'
 225
 226            # is the blog already exported?
 227            if h in filenodes:
 228                mark = filenodes[h]
 229                final.append((mode, mark, path))
 230                continue
 231
 232            d = tree.get_file_text(fid)
 233        elif kind == 'directory':
 234            continue
 235        else:
 236            die("Unhandled kind '%s' for path '%s'" % (kind, path))
 237
 238        mark = marks.next_mark()
 239        filenodes[h] = mark
 240
 241        print "blob"
 242        print "mark :%u" % mark
 243        print "data %d" % len(d)
 244        print d
 245
 246        final.append((mode, mark, path))
 247
 248    return final
 249
 250def export_branch(branch, name):
 251    global prefix, dirname
 252
 253    ref = '%s/heads/%s' % (prefix, name)
 254    tip = marks.get_tip(name)
 255
 256    repo = branch.repository
 257    repo.lock_read()
 258    revs = branch.iter_merge_sorted_revisions(None, tip, 'exclude', 'forward')
 259    count = 0
 260
 261    revs = [revid for revid, _, _, _ in revs if not marks.is_marked(revid)]
 262
 263    for revid in revs:
 264
 265        rev = repo.get_revision(revid)
 266
 267        parents = rev.parent_ids
 268        time = rev.timestamp
 269        tz = rev.timezone
 270        committer = rev.committer.encode('utf-8')
 271        committer = "%s %u %s" % (fixup_user(committer), time, gittz(tz))
 272        authors = rev.get_apparent_authors()
 273        if authors:
 274            author = authors[0].encode('utf-8')
 275            author = "%s %u %s" % (fixup_user(author), time, gittz(tz))
 276        else:
 277            author = committer
 278        msg = rev.message.encode('utf-8')
 279
 280        msg += '\n'
 281
 282        if len(parents) == 0:
 283            parent = bzrlib.revision.NULL_REVISION
 284        else:
 285            parent = parents[0]
 286
 287        cur_tree = repo.revision_tree(revid)
 288        prev = repo.revision_tree(parent)
 289        modified, removed = get_filechanges(cur_tree, prev)
 290
 291        modified_final = export_files(cur_tree, modified)
 292
 293        if len(parents) == 0:
 294            print 'reset %s' % ref
 295
 296        print "commit %s" % ref
 297        print "mark :%d" % (marks.get_mark(revid))
 298        print "author %s" % (author)
 299        print "committer %s" % (committer)
 300        print "data %d" % (len(msg))
 301        print msg
 302
 303        for i, p in enumerate(parents):
 304            try:
 305                m = rev_to_mark(p)
 306            except KeyError:
 307                # ghost?
 308                continue
 309            if i == 0:
 310                print "from :%s" % m
 311            else:
 312                print "merge :%s" % m
 313
 314        for f in removed:
 315            print "D %s" % (f,)
 316        for f in modified_final:
 317            print "M %s :%u %s" % f
 318        print
 319
 320        count += 1
 321        if (count % 100 == 0):
 322            print "progress revision %s (%d/%d)" % (revid, count, len(revs))
 323            print "#############################################################"
 324
 325    repo.unlock()
 326
 327    revid = branch.last_revision()
 328
 329    # make sure the ref is updated
 330    print "reset %s" % ref
 331    print "from :%u" % rev_to_mark(revid)
 332    print
 333
 334    marks.set_tip(name, revid)
 335
 336def export_tag(repo, name):
 337    global tags
 338    try:
 339        print "reset refs/tags/%s" % name
 340        print "from :%u" % rev_to_mark(tags[name])
 341        print
 342    except KeyError:
 343        warn("TODO: fetch tag '%s'" % name)
 344
 345def 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
 371def 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
 381class 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
 518def c_style_unescape(string):
 519    if string[0] == string[-1] == '"':
 520        return string.decode('string-escape')[1:-1]
 521    return string
 522
 523def 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
 592def 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
 612def 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            revno, revid = repo.last_revision_info()
 637            if peer:
 638                if hasattr(peer, "import_last_revision_info_and_tags"):
 639                    peer.import_last_revision_info_and_tags(repo, revno, revid)
 640                else:
 641                    peer.import_last_revision_info(repo.repository, revno, revid)
 642            else:
 643                wt = repo.bzrdir.open_workingtree()
 644                wt.update()
 645        print "ok %s" % ref
 646    print
 647
 648def do_capabilities(parser):
 649    global dirname
 650
 651    print "import"
 652    print "export"
 653    print "refspec refs/heads/*:%s/heads/*" % prefix
 654
 655    path = os.path.join(dirname, 'marks-git')
 656
 657    if os.path.exists(path):
 658        print "*import-marks %s" % path
 659    print "*export-marks %s" % path
 660
 661    print
 662
 663def do_list(parser):
 664    global tags
 665    print "? refs/heads/%s" % 'master'
 666
 667    history = parser.repo.revision_history()
 668    for tag, revid in parser.repo.tags.get_tag_dict().items():
 669        if revid not in history:
 670            continue
 671        print "? refs/tags/%s" % tag
 672        tags[tag] = revid
 673    print "@refs/heads/%s HEAD" % 'master'
 674    print
 675
 676def get_repo(url, alias):
 677    global dirname, peer
 678
 679    origin = bzrlib.bzrdir.BzrDir.open(url)
 680    branch = origin.open_branch()
 681
 682    if not isinstance(origin.transport, bzrlib.transport.local.LocalTransport):
 683        clone_path = os.path.join(dirname, 'clone')
 684        remote_branch = branch
 685        if os.path.exists(clone_path):
 686            # pull
 687            d = bzrlib.bzrdir.BzrDir.open(clone_path)
 688            branch = d.open_branch()
 689            result = branch.pull(remote_branch, [], None, False)
 690        else:
 691            # clone
 692            d = origin.sprout(clone_path, None,
 693                    hardlink=True, create_tree_if_local=False,
 694                    source_branch=remote_branch)
 695            branch = d.open_branch()
 696            branch.bind(remote_branch)
 697
 698        peer = remote_branch
 699    else:
 700        peer = None
 701
 702    return branch
 703
 704def main(args):
 705    global marks, prefix, dirname
 706    global tags, filenodes
 707    global blob_marks
 708    global parsed_refs
 709    global files_cache
 710
 711    alias = args[1]
 712    url = args[2]
 713
 714    prefix = 'refs/bzr/%s' % alias
 715    tags = {}
 716    filenodes = {}
 717    blob_marks = {}
 718    parsed_refs = {}
 719    files_cache = {}
 720
 721    gitdir = os.environ['GIT_DIR']
 722    dirname = os.path.join(gitdir, 'bzr', alias)
 723
 724    if not os.path.exists(dirname):
 725        os.makedirs(dirname)
 726
 727    repo = get_repo(url, alias)
 728
 729    marks_path = os.path.join(dirname, 'marks-int')
 730    marks = Marks(marks_path)
 731
 732    parser = Parser(repo)
 733    for line in parser:
 734        if parser.check('capabilities'):
 735            do_capabilities(parser)
 736        elif parser.check('list'):
 737            do_list(parser)
 738        elif parser.check('import'):
 739            do_import(parser)
 740        elif parser.check('export'):
 741            do_export(parser)
 742        else:
 743            die('unhandled command: %s' % line)
 744        sys.stdout.flush()
 745
 746    marks.store()
 747
 748sys.exit(main(sys.argv))