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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2009-11-18 06:18:14 UTC
  • mfrom: (4634.97.5 doc-2.0)
  • Revision ID: pqm@pqm.ubuntu.com-20091118061814-695imx80olc79o7l
(mbp, trivial) additional doc building fix

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bzrlib/workingtree.py
1
 
# Copyright (C) 2005-2010 Canonical Ltd
 
1
# Copyright (C) 2005, 2006, 2007, 2008, 2009 Canonical Ltd
2
2
#
3
3
# This program is free software; you can redistribute it and/or modify
4
4
# it under the terms of the GNU General Public License as published by
29
29
WorkingTree.open(dir).
30
30
"""
31
31
 
 
32
# TODO: Give the workingtree sole responsibility for the working inventory;
 
33
# remove the variable and references to it from the branch.  This may require
 
34
# updating the commit code so as to update the inventory within the working
 
35
# copy, and making sure there's only one WorkingTree for any directory on disk.
 
36
# At the moment they may alias the inventory and have old copies of it in
 
37
# memory.  (Now done? -- mbp 20060309)
32
38
 
33
39
from cStringIO import StringIO
34
40
import os
59
65
    merge,
60
66
    revision as _mod_revision,
61
67
    revisiontree,
 
68
    textui,
62
69
    trace,
63
70
    transform,
64
71
    ui,
77
84
 
78
85
from bzrlib import symbol_versioning
79
86
from bzrlib.decorators import needs_read_lock, needs_write_lock
80
 
from bzrlib.lock import LogicalLockResult
81
87
from bzrlib.lockable_files import LockableFiles
82
88
from bzrlib.lockdir import LockDir
83
89
import bzrlib.mutabletree
96
102
from bzrlib.filters import filtered_input_file
97
103
from bzrlib.trace import mutter, note
98
104
from bzrlib.transport.local import LocalTransport
 
105
from bzrlib.progress import DummyProgress, ProgressPhase
99
106
from bzrlib.revision import CURRENT_REVISION
100
107
from bzrlib.rio import RioReader, rio_file, Stanza
101
108
from bzrlib.symbol_versioning import (
105
112
 
106
113
 
107
114
MERGE_MODIFIED_HEADER_1 = "BZR merge-modified list format 1"
108
 
# TODO: Modifying the conflict objects or their type is currently nearly
109
 
# impossible as there is no clear relationship between the working tree format
110
 
# and the conflict list file format.
111
115
CONFLICT_HEADER_1 = "BZR conflict list format 1"
112
116
 
113
117
ERROR_PATH_NOT_FOUND = 3    # WindowsError errno code, equivalent to ENOENT
168
172
        return ''
169
173
 
170
174
 
171
 
class WorkingTree(bzrlib.mutabletree.MutableTree,
172
 
    bzrdir.ControlComponent):
 
175
class WorkingTree(bzrlib.mutabletree.MutableTree):
173
176
    """Working copy tree.
174
177
 
175
178
    The inventory is held in the `Branch` working-inventory, and the
248
251
        self._rules_searcher = None
249
252
        self.views = self._make_views()
250
253
 
251
 
    @property
252
 
    def user_transport(self):
253
 
        return self.bzrdir.user_transport
254
 
 
255
 
    @property
256
 
    def control_transport(self):
257
 
        return self._transport
258
 
 
259
254
    def _detect_case_handling(self):
260
255
        wt_trans = self.bzrdir.get_workingtree_transport(None)
261
256
        try:
549
544
        else:
550
545
            parents = [last_rev]
551
546
        try:
552
 
            merges_bytes = self._transport.get_bytes('pending-merges')
 
547
            merges_file = self._transport.get('pending-merges')
553
548
        except errors.NoSuchFile:
554
549
            pass
555
550
        else:
556
 
            for l in osutils.split_lines(merges_bytes):
 
551
            for l in merges_file.readlines():
557
552
                revision_id = l.rstrip('\n')
558
553
                parents.append(revision_id)
559
554
        return parents
915
910
            branch.last_revision().
916
911
        """
917
912
        from bzrlib.merge import Merger, Merge3Merger
918
 
        merger = Merger(self.branch, this_tree=self)
919
 
        # check that there are no local alterations
920
 
        if not force and self.has_changes():
921
 
            raise errors.UncommittedChanges(self)
922
 
        if to_revision is None:
923
 
            to_revision = _mod_revision.ensure_null(branch.last_revision())
924
 
        merger.other_rev_id = to_revision
925
 
        if _mod_revision.is_null(merger.other_rev_id):
926
 
            raise errors.NoCommits(branch)
927
 
        self.branch.fetch(branch, last_revision=merger.other_rev_id)
928
 
        merger.other_basis = merger.other_rev_id
929
 
        merger.other_tree = self.branch.repository.revision_tree(
930
 
            merger.other_rev_id)
931
 
        merger.other_branch = branch
932
 
        if from_revision is None:
933
 
            merger.find_base()
934
 
        else:
935
 
            merger.set_base_revision(from_revision, branch)
936
 
        if merger.base_rev_id == merger.other_rev_id:
937
 
            raise errors.PointlessMerge
938
 
        merger.backup_files = False
939
 
        if merge_type is None:
940
 
            merger.merge_type = Merge3Merger
941
 
        else:
942
 
            merger.merge_type = merge_type
943
 
        merger.set_interesting_files(None)
944
 
        merger.show_base = False
945
 
        merger.reprocess = False
946
 
        conflicts = merger.do_merge()
947
 
        merger.set_pending()
 
913
        pb = ui.ui_factory.nested_progress_bar()
 
914
        try:
 
915
            merger = Merger(self.branch, this_tree=self, pb=pb)
 
916
            merger.pp = ProgressPhase("Merge phase", 5, pb)
 
917
            merger.pp.next_phase()
 
918
            # check that there are no local alterations
 
919
            if not force and self.has_changes():
 
920
                raise errors.UncommittedChanges(self)
 
921
            if to_revision is None:
 
922
                to_revision = _mod_revision.ensure_null(branch.last_revision())
 
923
            merger.other_rev_id = to_revision
 
924
            if _mod_revision.is_null(merger.other_rev_id):
 
925
                raise errors.NoCommits(branch)
 
926
            self.branch.fetch(branch, last_revision=merger.other_rev_id)
 
927
            merger.other_basis = merger.other_rev_id
 
928
            merger.other_tree = self.branch.repository.revision_tree(
 
929
                merger.other_rev_id)
 
930
            merger.other_branch = branch
 
931
            merger.pp.next_phase()
 
932
            if from_revision is None:
 
933
                merger.find_base()
 
934
            else:
 
935
                merger.set_base_revision(from_revision, branch)
 
936
            if merger.base_rev_id == merger.other_rev_id:
 
937
                raise errors.PointlessMerge
 
938
            merger.backup_files = False
 
939
            if merge_type is None:
 
940
                merger.merge_type = Merge3Merger
 
941
            else:
 
942
                merger.merge_type = merge_type
 
943
            merger.set_interesting_files(None)
 
944
            merger.show_base = False
 
945
            merger.reprocess = False
 
946
            conflicts = merger.do_merge()
 
947
            merger.set_pending()
 
948
        finally:
 
949
            pb.finished()
948
950
        return conflicts
949
951
 
950
952
    @needs_read_lock
1097
1099
        tree_transport = self.bzrdir.root_transport.clone(sub_path)
1098
1100
        if tree_transport.base != branch_transport.base:
1099
1101
            tree_bzrdir = format.initialize_on_transport(tree_transport)
1100
 
            branch.BranchReferenceFormat().initialize(tree_bzrdir,
1101
 
                target_branch=new_branch)
 
1102
            branch.BranchReferenceFormat().initialize(tree_bzrdir, new_branch)
1102
1103
        else:
1103
1104
            tree_bzrdir = branch_bzrdir
1104
1105
        wt = tree_bzrdir.create_workingtree(_mod_revision.NULL_REVISION)
1142
1143
        This does not include files that have been deleted in this
1143
1144
        tree. Skips the control directory.
1144
1145
 
1145
 
        :param include_root: if True, return an entry for the root
 
1146
        :param include_root: if True, do not return an entry for the root
1146
1147
        :param from_dir: start from this directory or None for the root
1147
1148
        :param recursive: whether to recurse into subdirectories or not
1148
1149
        """
1602
1603
    @needs_write_lock
1603
1604
    def pull(self, source, overwrite=False, stop_revision=None,
1604
1605
             change_reporter=None, possible_transports=None, local=False):
 
1606
        top_pb = ui.ui_factory.nested_progress_bar()
1605
1607
        source.lock_read()
1606
1608
        try:
 
1609
            pp = ProgressPhase("Pull phase", 2, top_pb)
 
1610
            pp.next_phase()
1607
1611
            old_revision_info = self.branch.last_revision_info()
1608
1612
            basis_tree = self.basis_tree()
1609
1613
            count = self.branch.pull(source, overwrite, stop_revision,
1611
1615
                                     local=local)
1612
1616
            new_revision_info = self.branch.last_revision_info()
1613
1617
            if new_revision_info != old_revision_info:
 
1618
                pp.next_phase()
1614
1619
                repository = self.branch.repository
 
1620
                pb = ui.ui_factory.nested_progress_bar()
1615
1621
                basis_tree.lock_read()
1616
1622
                try:
1617
1623
                    new_basis_tree = self.branch.basis_tree()
1620
1626
                                new_basis_tree,
1621
1627
                                basis_tree,
1622
1628
                                this_tree=self,
1623
 
                                pb=None,
 
1629
                                pb=pb,
1624
1630
                                change_reporter=change_reporter)
1625
 
                    basis_root_id = basis_tree.get_root_id()
1626
 
                    new_root_id = new_basis_tree.get_root_id()
1627
 
                    if basis_root_id != new_root_id:
1628
 
                        self.set_root_id(new_root_id)
 
1631
                    if (basis_tree.inventory.root is None and
 
1632
                        new_basis_tree.inventory.root is not None):
 
1633
                        self.set_root_id(new_basis_tree.get_root_id())
1629
1634
                finally:
 
1635
                    pb.finished()
1630
1636
                    basis_tree.unlock()
1631
1637
                # TODO - dedup parents list with things merged by pull ?
1632
1638
                # reuse the revisiontree we merged against to set the new
1645
1651
            return count
1646
1652
        finally:
1647
1653
            source.unlock()
 
1654
            top_pb.finished()
1648
1655
 
1649
1656
    @needs_write_lock
1650
1657
    def put_file_bytes_non_atomic(self, file_id, bytes):
1735
1742
        r"""Check whether the filename matches an ignore pattern.
1736
1743
 
1737
1744
        Patterns containing '/' or '\' need to match the whole path;
1738
 
        others match against only the last component.  Patterns starting
1739
 
        with '!' are ignore exceptions.  Exceptions take precedence
1740
 
        over regular patterns and cause the filename to not be ignored.
 
1745
        others match against only the last component.
1741
1746
 
1742
1747
        If the file is ignored, returns the pattern which caused it to
1743
1748
        be ignored, otherwise None.  So this can simply be used as a
1744
1749
        boolean if desired."""
1745
1750
        if getattr(self, '_ignoreglobster', None) is None:
1746
 
            self._ignoreglobster = globbing.ExceptionGlobster(self.get_ignore_list())
 
1751
            self._ignoreglobster = globbing.Globster(self.get_ignore_list())
1747
1752
        return self._ignoreglobster.match(filename)
1748
1753
 
1749
1754
    def kind(self, file_id):
1799
1804
            raise errors.ObjectNotLocked(self)
1800
1805
 
1801
1806
    def lock_read(self):
1802
 
        """Lock the tree for reading.
1803
 
 
1804
 
        This also locks the branch, and can be unlocked via self.unlock().
1805
 
 
1806
 
        :return: A bzrlib.lock.LogicalLockResult.
1807
 
        """
 
1807
        """See Branch.lock_read, and WorkingTree.unlock."""
1808
1808
        if not self.is_locked():
1809
1809
            self._reset_data()
1810
1810
        self.branch.lock_read()
1811
1811
        try:
1812
 
            self._control_files.lock_read()
1813
 
            return LogicalLockResult(self.unlock)
 
1812
            return self._control_files.lock_read()
1814
1813
        except:
1815
1814
            self.branch.unlock()
1816
1815
            raise
1817
1816
 
1818
1817
    def lock_tree_write(self):
1819
 
        """See MutableTree.lock_tree_write, and WorkingTree.unlock.
1820
 
 
1821
 
        :return: A bzrlib.lock.LogicalLockResult.
1822
 
        """
 
1818
        """See MutableTree.lock_tree_write, and WorkingTree.unlock."""
1823
1819
        if not self.is_locked():
1824
1820
            self._reset_data()
1825
1821
        self.branch.lock_read()
1826
1822
        try:
1827
 
            self._control_files.lock_write()
1828
 
            return LogicalLockResult(self.unlock)
 
1823
            return self._control_files.lock_write()
1829
1824
        except:
1830
1825
            self.branch.unlock()
1831
1826
            raise
1832
1827
 
1833
1828
    def lock_write(self):
1834
 
        """See MutableTree.lock_write, and WorkingTree.unlock.
1835
 
 
1836
 
        :return: A bzrlib.lock.LogicalLockResult.
1837
 
        """
 
1829
        """See MutableTree.lock_write, and WorkingTree.unlock."""
1838
1830
        if not self.is_locked():
1839
1831
            self._reset_data()
1840
1832
        self.branch.lock_write()
1841
1833
        try:
1842
 
            self._control_files.lock_write()
1843
 
            return LogicalLockResult(self.unlock)
 
1834
            return self._control_files.lock_write()
1844
1835
        except:
1845
1836
            self.branch.unlock()
1846
1837
            raise
1854
1845
    def _reset_data(self):
1855
1846
        """Reset transient data that cannot be revalidated."""
1856
1847
        self._inventory_is_modified = False
1857
 
        f = self._transport.get('inventory')
1858
 
        try:
1859
 
            result = self._deserialize(f)
1860
 
        finally:
1861
 
            f.close()
 
1848
        result = self._deserialize(self._transport.get('inventory'))
1862
1849
        self._set_inventory(result, dirty=False)
1863
1850
 
1864
1851
    @needs_tree_write_lock
1911
1898
            # revision_id is set. We must check for this full string, because a
1912
1899
            # root node id can legitimately look like 'revision_id' but cannot
1913
1900
            # contain a '"'.
1914
 
            xml = self.branch.repository._get_inventory_xml(new_revision)
 
1901
            xml = self.branch.repository.get_inventory_xml(new_revision)
1915
1902
            firstline = xml.split('\n', 1)[0]
1916
1903
            if (not 'revision_id="' in firstline or
1917
1904
                'format="7"' not in firstline):
1940
1927
        # binary.
1941
1928
        if self._inventory_is_modified:
1942
1929
            raise errors.InventoryModified(self)
1943
 
        f = self._transport.get('inventory')
1944
 
        try:
1945
 
            result = self._deserialize(f)
1946
 
        finally:
1947
 
            f.close()
 
1930
        result = self._deserialize(self._transport.get('inventory'))
1948
1931
        self._set_inventory(result, dirty=False)
1949
1932
        return result
1950
1933
 
1965
1948
 
1966
1949
        new_files=set()
1967
1950
        unknown_nested_files=set()
1968
 
        if to_file is None:
1969
 
            to_file = sys.stdout
1970
1951
 
1971
1952
        def recurse_directory_to_add_files(directory):
1972
1953
            # Recurse directory and add all files
2042
2023
                        new_status = 'I'
2043
2024
                    else:
2044
2025
                        new_status = '?'
2045
 
                    # XXX: Really should be a more abstract reporter interface
2046
 
                    kind_ch = osutils.kind_marker(self.kind(fid))
2047
 
                    to_file.write(new_status + '       ' + f + kind_ch + '\n')
 
2026
                    textui.show_status(new_status, self.kind(fid), f,
 
2027
                                       to_file=to_file)
2048
2028
                # Unversion file
2049
2029
                inv_delta.append((f, None, fid, None))
2050
2030
                message = "removed %s" % (f,)
2073
2053
 
2074
2054
    @needs_tree_write_lock
2075
2055
    def revert(self, filenames=None, old_tree=None, backups=True,
2076
 
               pb=None, report_changes=False):
 
2056
               pb=DummyProgress(), report_changes=False):
2077
2057
        from bzrlib.conflicts import resolve
2078
2058
        if filenames == []:
2079
2059
            filenames = None
2201
2181
        """
2202
2182
        raise NotImplementedError(self.unlock)
2203
2183
 
2204
 
    _marker = object()
2205
 
 
2206
 
    def update(self, change_reporter=None, possible_transports=None,
2207
 
               revision=None, old_tip=_marker):
 
2184
    def update(self, change_reporter=None, possible_transports=None):
2208
2185
        """Update a working tree along its branch.
2209
2186
 
2210
2187
        This will update the branch if its bound too, which means we have
2228
2205
        - Merge current state -> basis tree of the master w.r.t. the old tree
2229
2206
          basis.
2230
2207
        - Do a 'normal' merge of the old branch basis if it is relevant.
2231
 
 
2232
 
        :param revision: The target revision to update to. Must be in the
2233
 
            revision history.
2234
 
        :param old_tip: If branch.update() has already been run, the value it
2235
 
            returned (old tip of the branch or None). _marker is used
2236
 
            otherwise.
2237
2208
        """
2238
2209
        if self.branch.get_bound_location() is not None:
2239
2210
            self.lock_write()
2240
 
            update_branch = (old_tip is self._marker)
 
2211
            update_branch = True
2241
2212
        else:
2242
2213
            self.lock_tree_write()
2243
2214
            update_branch = False
2245
2216
            if update_branch:
2246
2217
                old_tip = self.branch.update(possible_transports)
2247
2218
            else:
2248
 
                if old_tip is self._marker:
2249
 
                    old_tip = None
2250
 
            return self._update_tree(old_tip, change_reporter, revision)
 
2219
                old_tip = None
 
2220
            return self._update_tree(old_tip, change_reporter)
2251
2221
        finally:
2252
2222
            self.unlock()
2253
2223
 
2254
2224
    @needs_tree_write_lock
2255
 
    def _update_tree(self, old_tip=None, change_reporter=None, revision=None):
 
2225
    def _update_tree(self, old_tip=None, change_reporter=None):
2256
2226
        """Update a tree to the master branch.
2257
2227
 
2258
2228
        :param old_tip: if supplied, the previous tip revision the branch,
2268
2238
        # We MUST save it even if an error occurs, because otherwise the users
2269
2239
        # local work is unreferenced and will appear to have been lost.
2270
2240
        #
2271
 
        nb_conflicts = 0
 
2241
        result = 0
2272
2242
        try:
2273
2243
            last_rev = self.get_parent_ids()[0]
2274
2244
        except IndexError:
2275
2245
            last_rev = _mod_revision.NULL_REVISION
2276
 
        if revision is None:
2277
 
            revision = self.branch.last_revision()
2278
 
 
2279
 
        old_tip = old_tip or _mod_revision.NULL_REVISION
2280
 
 
2281
 
        if not _mod_revision.is_null(old_tip) and old_tip != last_rev:
2282
 
            # the branch we are bound to was updated
2283
 
            # merge those changes in first
2284
 
            base_tree  = self.basis_tree()
2285
 
            other_tree = self.branch.repository.revision_tree(old_tip)
2286
 
            nb_conflicts = merge.merge_inner(self.branch, other_tree,
2287
 
                                             base_tree, this_tree=self,
2288
 
                                             change_reporter=change_reporter)
2289
 
            if nb_conflicts:
2290
 
                self.add_parent_tree((old_tip, other_tree))
2291
 
                trace.note('Rerun update after fixing the conflicts.')
2292
 
                return nb_conflicts
2293
 
 
2294
 
        if last_rev != _mod_revision.ensure_null(revision):
2295
 
            # the working tree is up to date with the branch
2296
 
            # we can merge the specified revision from master
2297
 
            to_tree = self.branch.repository.revision_tree(revision)
2298
 
            to_root_id = to_tree.get_root_id()
2299
 
 
 
2246
        if last_rev != _mod_revision.ensure_null(self.branch.last_revision()):
 
2247
            # merge tree state up to new branch tip.
2300
2248
            basis = self.basis_tree()
2301
2249
            basis.lock_read()
2302
2250
            try:
2303
 
                if (basis.inventory.root is None
2304
 
                    or basis.inventory.root.file_id != to_root_id):
2305
 
                    self.set_root_id(to_root_id)
 
2251
                to_tree = self.branch.basis_tree()
 
2252
                if basis.inventory.root is None:
 
2253
                    self.set_root_id(to_tree.get_root_id())
2306
2254
                    self.flush()
 
2255
                result += merge.merge_inner(
 
2256
                                      self.branch,
 
2257
                                      to_tree,
 
2258
                                      basis,
 
2259
                                      this_tree=self,
 
2260
                                      change_reporter=change_reporter)
2307
2261
            finally:
2308
2262
                basis.unlock()
2309
 
 
2310
 
            # determine the branch point
2311
 
            graph = self.branch.repository.get_graph()
2312
 
            base_rev_id = graph.find_unique_lca(self.branch.last_revision(),
2313
 
                                                last_rev)
2314
 
            base_tree = self.branch.repository.revision_tree(base_rev_id)
2315
 
 
2316
 
            nb_conflicts = merge.merge_inner(self.branch, to_tree, base_tree,
2317
 
                                             this_tree=self,
2318
 
                                             change_reporter=change_reporter)
2319
 
            self.set_last_revision(revision)
2320
2263
            # TODO - dedup parents list with things merged by pull ?
2321
2264
            # reuse the tree we've updated to to set the basis:
2322
 
            parent_trees = [(revision, to_tree)]
 
2265
            parent_trees = [(self.branch.last_revision(), to_tree)]
2323
2266
            merges = self.get_parent_ids()[1:]
2324
2267
            # Ideally we ask the tree for the trees here, that way the working
2325
2268
            # tree can decide whether to give us the entire tree or give us a
2329
2272
            for parent in merges:
2330
2273
                parent_trees.append(
2331
2274
                    (parent, self.branch.repository.revision_tree(parent)))
2332
 
            if not _mod_revision.is_null(old_tip):
 
2275
            if (old_tip is not None and not _mod_revision.is_null(old_tip)):
2333
2276
                parent_trees.append(
2334
2277
                    (old_tip, self.branch.repository.revision_tree(old_tip)))
2335
2278
            self.set_parent_trees(parent_trees)
2336
2279
            last_rev = parent_trees[0][0]
2337
 
        return nb_conflicts
 
2280
        else:
 
2281
            # the working tree had the same last-revision as the master
 
2282
            # branch did. We may still have pivot local work from the local
 
2283
            # branch into old_tip:
 
2284
            if (old_tip is not None and not _mod_revision.is_null(old_tip)):
 
2285
                self.add_parent_tree_id(old_tip)
 
2286
        if (old_tip is not None and not _mod_revision.is_null(old_tip)
 
2287
            and old_tip != last_rev):
 
2288
            # our last revision was not the prior branch last revision
 
2289
            # and we have converted that last revision to a pending merge.
 
2290
            # base is somewhere between the branch tip now
 
2291
            # and the now pending merge
 
2292
 
 
2293
            # Since we just modified the working tree and inventory, flush out
 
2294
            # the current state, before we modify it again.
 
2295
            # TODO: jam 20070214 WorkingTree3 doesn't require this, dirstate
 
2296
            #       requires it only because TreeTransform directly munges the
 
2297
            #       inventory and calls tree._write_inventory(). Ultimately we
 
2298
            #       should be able to remove this extra flush.
 
2299
            self.flush()
 
2300
            graph = self.branch.repository.get_graph()
 
2301
            base_rev_id = graph.find_unique_lca(self.branch.last_revision(),
 
2302
                                                old_tip)
 
2303
            base_tree = self.branch.repository.revision_tree(base_rev_id)
 
2304
            other_tree = self.branch.repository.revision_tree(old_tip)
 
2305
            result += merge.merge_inner(
 
2306
                                  self.branch,
 
2307
                                  other_tree,
 
2308
                                  base_tree,
 
2309
                                  this_tree=self,
 
2310
                                  change_reporter=change_reporter)
 
2311
        return result
2338
2312
 
2339
2313
    def _write_hashcache_if_dirty(self):
2340
2314
        """Write out the hashcache if it is dirty."""
2610
2584
        """
2611
2585
        return
2612
2586
 
 
2587
    @needs_read_lock
2613
2588
    def _get_rules_searcher(self, default_searcher):
2614
2589
        """See Tree._get_rules_searcher."""
2615
2590
        if self._rules_searcher is None:
2651
2626
 
2652
2627
        In Format2 WorkingTrees we have a single lock for the branch and tree
2653
2628
        so lock_tree_write() degrades to lock_write().
2654
 
 
2655
 
        :return: An object with an unlock method which will release the lock
2656
 
            obtained.
2657
2629
        """
2658
2630
        self.branch.lock_write()
2659
2631
        try:
2660
 
            self._control_files.lock_write()
2661
 
            return self
 
2632
            return self._control_files.lock_write()
2662
2633
        except:
2663
2634
            self.branch.unlock()
2664
2635
            raise
2798
2769
        """Return the format for the working tree object in a_bzrdir."""
2799
2770
        try:
2800
2771
            transport = a_bzrdir.get_workingtree_transport(None)
2801
 
            format_string = transport.get_bytes("format")
 
2772
            format_string = transport.get("format").read()
2802
2773
            return klass._formats[format_string]
2803
2774
        except errors.NoSuchFile:
2804
2775
            raise errors.NoWorkingTree(base=transport.base)