/brz/remove-bazaar : contents of bzrlib/tests/test

: (revision 3835)

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# Copyright (C) 2005, 2006, 2007 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Tests for Knit data structure"""

from cStringIO import StringIO
import difflib
import gzip
import sys

from bzrlib import (
    errors,
    generate_ids,
    knit,
    multiparent,
    osutils,
    pack,
    )
from bzrlib.errors import (
    RevisionAlreadyPresent,
    KnitHeaderError,
    RevisionNotPresent,
    NoSuchFile,
    )
from bzrlib.index import *
from bzrlib.knit import (
    AnnotatedKnitContent,
    KnitContent,
    KnitSequenceMatcher,
    KnitVersionedFiles,
    PlainKnitContent,
    _DirectPackAccess,
    _KndxIndex,
    _KnitGraphIndex,
    _KnitKeyAccess,
    make_file_factory,
    )
from bzrlib.tests import (
    Feature,
    KnownFailure,
    TestCase,
    TestCaseWithMemoryTransport,
    TestCaseWithTransport,
    TestNotApplicable,
    )
from bzrlib.transport import get_transport
from bzrlib.transport.memory import MemoryTransport
from bzrlib.tuned_gzip import GzipFile
from bzrlib.versionedfile import (
    AbsentContentFactory,
    ConstantMapper,
    RecordingVersionedFilesDecorator,
    )


class _CompiledKnitFeature(Feature):

    def _probe(self):
        try:
            import bzrlib._knit_load_data_c
        except ImportError:
            return False
        return True

    def feature_name(self):
        return 'bzrlib._knit_load_data_c'

CompiledKnitFeature = _CompiledKnitFeature()


class KnitContentTestsMixin(object):

    def test_constructor(self):
        content = self._make_content([])

    def test_text(self):
        content = self._make_content([])
        self.assertEqual(content.text(), [])

        content = self._make_content([("origin1", "text1"), ("origin2", "text2")])
        self.assertEqual(content.text(), ["text1", "text2"])

    def test_copy(self):
        content = self._make_content([("origin1", "text1"), ("origin2", "text2")])
        copy = content.copy()
        self.assertIsInstance(copy, content.__class__)
        self.assertEqual(copy.annotate(), content.annotate())

    def assertDerivedBlocksEqual(self, source, target, noeol=False):
        """Assert that the derived matching blocks match real output"""
        source_lines = source.splitlines(True)
        target_lines = target.splitlines(True)
        def nl(line):
            if noeol and not line.endswith('\n'):
                return line + '\n'
            else:
                return line
        source_content = self._make_content([(None, nl(l)) for l in source_lines])
        target_content = self._make_content([(None, nl(l)) for l in target_lines])
        line_delta = source_content.line_delta(target_content)
        delta_blocks = list(KnitContent.get_line_delta_blocks(line_delta,
            source_lines, target_lines))
        matcher = KnitSequenceMatcher(None, source_lines, target_lines)
        matcher_blocks = list(list(matcher.get_matching_blocks()))
        self.assertEqual(matcher_blocks, delta_blocks)

    def test_get_line_delta_blocks(self):
        self.assertDerivedBlocksEqual('a\nb\nc\n', 'q\nc\n')
        self.assertDerivedBlocksEqual(TEXT_1, TEXT_1)
        self.assertDerivedBlocksEqual(TEXT_1, TEXT_1A)
        self.assertDerivedBlocksEqual(TEXT_1, TEXT_1B)
        self.assertDerivedBlocksEqual(TEXT_1B, TEXT_1A)
        self.assertDerivedBlocksEqual(TEXT_1A, TEXT_1B)
        self.assertDerivedBlocksEqual(TEXT_1A, '')
        self.assertDerivedBlocksEqual('', TEXT_1A)
        self.assertDerivedBlocksEqual('', '')
        self.assertDerivedBlocksEqual('a\nb\nc', 'a\nb\nc\nd')

    def test_get_line_delta_blocks_noeol(self):
        """Handle historical knit deltas safely

        Some existing knit deltas don't consider the last line to differ
        when the only difference whether it has a final newline.

        New knit deltas appear to always consider the last line to differ
        in this case.
        """
        self.assertDerivedBlocksEqual('a\nb\nc', 'a\nb\nc\nd\n', noeol=True)
        self.assertDerivedBlocksEqual('a\nb\nc\nd\n', 'a\nb\nc', noeol=True)
        self.assertDerivedBlocksEqual('a\nb\nc\n', 'a\nb\nc', noeol=True)
        self.assertDerivedBlocksEqual('a\nb\nc', 'a\nb\nc\n', noeol=True)


TEXT_1 = """\
Banana cup cakes:

- bananas
- eggs
- broken tea cups
"""

TEXT_1A = """\
Banana cup cake recipe
(serves 6)

- bananas
- eggs
- broken tea cups
- self-raising flour
"""

TEXT_1B = """\
Banana cup cake recipe

- bananas (do not use plantains!!!)
- broken tea cups
- flour
"""

delta_1_1a = """\
0,1,2
Banana cup cake recipe
(serves 6)
5,5,1
- self-raising flour
"""

TEXT_2 = """\
Boeuf bourguignon

- beef
- red wine
- small onions
- carrot
- mushrooms
"""


class TestPlainKnitContent(TestCase, KnitContentTestsMixin):

    def _make_content(self, lines):
        annotated_content = AnnotatedKnitContent(lines)
        return PlainKnitContent(annotated_content.text(), 'bogus')

    def test_annotate(self):
        content = self._make_content([])
        self.assertEqual(content.annotate(), [])

        content = self._make_content([("origin1", "text1"), ("origin2", "text2")])
        self.assertEqual(content.annotate(),
            [("bogus", "text1"), ("bogus", "text2")])

    def test_line_delta(self):
        content1 = self._make_content([("", "a"), ("", "b")])
        content2 = self._make_content([("", "a"), ("", "a"), ("", "c")])
        self.assertEqual(content1.line_delta(content2),
            [(1, 2, 2, ["a", "c"])])

    def test_line_delta_iter(self):
        content1 = self._make_content([("", "a"), ("", "b")])
        content2 = self._make_content([("", "a"), ("", "a"), ("", "c")])
        it = content1.line_delta_iter(content2)
        self.assertEqual(it.next(), (1, 2, 2, ["a", "c"]))
        self.assertRaises(StopIteration, it.next)


class TestAnnotatedKnitContent(TestCase, KnitContentTestsMixin):

    def _make_content(self, lines):
        return AnnotatedKnitContent(lines)

    def test_annotate(self):
        content = self._make_content([])
        self.assertEqual(content.annotate(), [])

        content = self._make_content([("origin1", "text1"), ("origin2", "text2")])
        self.assertEqual(content.annotate(),
            [("origin1", "text1"), ("origin2", "text2")])

    def test_line_delta(self):
        content1 = self._make_content([("", "a"), ("", "b")])
        content2 = self._make_content([("", "a"), ("", "a"), ("", "c")])
        self.assertEqual(content1.line_delta(content2),
            [(1, 2, 2, [("", "a"), ("", "c")])])

    def test_line_delta_iter(self):
        content1 = self._make_content([("", "a"), ("", "b")])
        content2 = self._make_content([("", "a"), ("", "a"), ("", "c")])
        it = content1.line_delta_iter(content2)
        self.assertEqual(it.next(), (1, 2, 2, [("", "a"), ("", "c")]))
        self.assertRaises(StopIteration, it.next)


class MockTransport(object):

    def __init__(self, file_lines=None):
        self.file_lines = file_lines
        self.calls = []
        # We have no base directory for the MockTransport
        self.base = ''

    def get(self, filename):
        if self.file_lines is None:
            raise NoSuchFile(filename)
        else:
            return StringIO("\n".join(self.file_lines))

    def readv(self, relpath, offsets):
        fp = self.get(relpath)
        for offset, size in offsets:
            fp.seek(offset)
            yield offset, fp.read(size)

    def __getattr__(self, name):
        def queue_call(*args, **kwargs):
            self.calls.append((name, args, kwargs))
        return queue_call


class KnitRecordAccessTestsMixin(object):
    """Tests for getting and putting knit records."""

    def test_add_raw_records(self):
        """Add_raw_records adds records retrievable later."""
        access = self.get_access()
        memos = access.add_raw_records([('key', 10)], '1234567890')
        self.assertEqual(['1234567890'], list(access.get_raw_records(memos)))
 
    def test_add_several_raw_records(self):
        """add_raw_records with many records and read some back."""
        access = self.get_access()
        memos = access.add_raw_records([('key', 10), ('key2', 2), ('key3', 5)],
            '12345678901234567')
        self.assertEqual(['1234567890', '12', '34567'],
            list(access.get_raw_records(memos)))
        self.assertEqual(['1234567890'],
            list(access.get_raw_records(memos[0:1])))
        self.assertEqual(['12'],
            list(access.get_raw_records(memos[1:2])))
        self.assertEqual(['34567'],
            list(access.get_raw_records(memos[2:3])))
        self.assertEqual(['1234567890', '34567'],
            list(access.get_raw_records(memos[0:1] + memos[2:3])))


class TestKnitKnitAccess(TestCaseWithMemoryTransport, KnitRecordAccessTestsMixin):
    """Tests for the .kndx implementation."""

    def get_access(self):
        """Get a .knit style access instance."""
        mapper = ConstantMapper("foo")
        access = _KnitKeyAccess(self.get_transport(), mapper)
        return access
    

class TestPackKnitAccess(TestCaseWithMemoryTransport, KnitRecordAccessTestsMixin):
    """Tests for the pack based access."""

    def get_access(self):
        return self._get_access()[0]

    def _get_access(self, packname='packfile', index='FOO'):
        transport = self.get_transport()
        def write_data(bytes):
            transport.append_bytes(packname, bytes)
        writer = pack.ContainerWriter(write_data)
        writer.begin()
        access = _DirectPackAccess({})
        access.set_writer(writer, index, (transport, packname))
        return access, writer

    def test_read_from_several_packs(self):
        access, writer = self._get_access()
        memos = []
        memos.extend(access.add_raw_records([('key', 10)], '1234567890'))
        writer.end()
        access, writer = self._get_access('pack2', 'FOOBAR')
        memos.extend(access.add_raw_records([('key', 5)], '12345'))
        writer.end()
        access, writer = self._get_access('pack3', 'BAZ')
        memos.extend(access.add_raw_records([('key', 5)], 'alpha'))
        writer.end()
        transport = self.get_transport()
        access = _DirectPackAccess({"FOO":(transport, 'packfile'),
            "FOOBAR":(transport, 'pack2'),
            "BAZ":(transport, 'pack3')})
        self.assertEqual(['1234567890', '12345', 'alpha'],
            list(access.get_raw_records(memos)))
        self.assertEqual(['1234567890'],
            list(access.get_raw_records(memos[0:1])))
        self.assertEqual(['12345'],
            list(access.get_raw_records(memos[1:2])))
        self.assertEqual(['alpha'],
            list(access.get_raw_records(memos[2:3])))
        self.assertEqual(['1234567890', 'alpha'],
            list(access.get_raw_records(memos[0:1] + memos[2:3])))

    def test_set_writer(self):
        """The writer should be settable post construction."""
        access = _DirectPackAccess({})
        transport = self.get_transport()
        packname = 'packfile'
        index = 'foo'
        def write_data(bytes):
            transport.append_bytes(packname, bytes)
        writer = pack.ContainerWriter(write_data)
        writer.begin()
        access.set_writer(writer, index, (transport, packname))
        memos = access.add_raw_records([('key', 10)], '1234567890')
        writer.end()
        self.assertEqual(['1234567890'], list(access.get_raw_records(memos)))


class LowLevelKnitDataTests(TestCase):

    def create_gz_content(self, text):
        sio = StringIO()
        gz_file = gzip.GzipFile(mode='wb', fileobj=sio)
        gz_file.write(text)
        gz_file.close()
        return sio.getvalue()

    def test_valid_knit_data(self):
        sha1sum = osutils.sha('foo\nbar\n').hexdigest()
        gz_txt = self.create_gz_content('version rev-id-1 2 %s\n'
                                        'foo\n'
                                        'bar\n'
                                        'end rev-id-1\n'
                                        % (sha1sum,))
        transport = MockTransport([gz_txt])
        access = _KnitKeyAccess(transport, ConstantMapper('filename'))
        knit = KnitVersionedFiles(None, access)
        records = [(('rev-id-1',), (('rev-id-1',), 0, len(gz_txt)))]

        contents = list(knit._read_records_iter(records))
        self.assertEqual([(('rev-id-1',), ['foo\n', 'bar\n'],
            '4e48e2c9a3d2ca8a708cb0cc545700544efb5021')], contents)

        raw_contents = list(knit._read_records_iter_raw(records))
        self.assertEqual([(('rev-id-1',), gz_txt, sha1sum)], raw_contents)

    def test_not_enough_lines(self):
        sha1sum = osutils.sha('foo\n').hexdigest()
        # record says 2 lines data says 1
        gz_txt = self.create_gz_content('version rev-id-1 2 %s\n'
                                        'foo\n'
                                        'end rev-id-1\n'
                                        % (sha1sum,))
        transport = MockTransport([gz_txt])
        access = _KnitKeyAccess(transport, ConstantMapper('filename'))
        knit = KnitVersionedFiles(None, access)
        records = [(('rev-id-1',), (('rev-id-1',), 0, len(gz_txt)))]
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter(records))

        # read_records_iter_raw won't detect that sort of mismatch/corruption
        raw_contents = list(knit._read_records_iter_raw(records))
        self.assertEqual([(('rev-id-1',),  gz_txt, sha1sum)], raw_contents)

    def test_too_many_lines(self):
        sha1sum = osutils.sha('foo\nbar\n').hexdigest()
        # record says 1 lines data says 2
        gz_txt = self.create_gz_content('version rev-id-1 1 %s\n'
                                        'foo\n'
                                        'bar\n'
                                        'end rev-id-1\n'
                                        % (sha1sum,))
        transport = MockTransport([gz_txt])
        access = _KnitKeyAccess(transport, ConstantMapper('filename'))
        knit = KnitVersionedFiles(None, access)
        records = [(('rev-id-1',), (('rev-id-1',), 0, len(gz_txt)))]
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter(records))

        # read_records_iter_raw won't detect that sort of mismatch/corruption
        raw_contents = list(knit._read_records_iter_raw(records))
        self.assertEqual([(('rev-id-1',), gz_txt, sha1sum)], raw_contents)

    def test_mismatched_version_id(self):
        sha1sum = osutils.sha('foo\nbar\n').hexdigest()
        gz_txt = self.create_gz_content('version rev-id-1 2 %s\n'
                                        'foo\n'
                                        'bar\n'
                                        'end rev-id-1\n'
                                        % (sha1sum,))
        transport = MockTransport([gz_txt])
        access = _KnitKeyAccess(transport, ConstantMapper('filename'))
        knit = KnitVersionedFiles(None, access)
        # We are asking for rev-id-2, but the data is rev-id-1
        records = [(('rev-id-2',), (('rev-id-2',), 0, len(gz_txt)))]
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter(records))

        # read_records_iter_raw detects mismatches in the header
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter_raw(records))

    def test_uncompressed_data(self):
        sha1sum = osutils.sha('foo\nbar\n').hexdigest()
        txt = ('version rev-id-1 2 %s\n'
               'foo\n'
               'bar\n'
               'end rev-id-1\n'
               % (sha1sum,))
        transport = MockTransport([txt])
        access = _KnitKeyAccess(transport, ConstantMapper('filename'))
        knit = KnitVersionedFiles(None, access)
        records = [(('rev-id-1',), (('rev-id-1',), 0, len(txt)))]

        # We don't have valid gzip data ==> corrupt
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter(records))

        # read_records_iter_raw will notice the bad data
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter_raw(records))

    def test_corrupted_data(self):
        sha1sum = osutils.sha('foo\nbar\n').hexdigest()
        gz_txt = self.create_gz_content('version rev-id-1 2 %s\n'
                                        'foo\n'
                                        'bar\n'
                                        'end rev-id-1\n'
                                        % (sha1sum,))
        # Change 2 bytes in the middle to \xff
        gz_txt = gz_txt[:10] + '\xff\xff' + gz_txt[12:]
        transport = MockTransport([gz_txt])
        access = _KnitKeyAccess(transport, ConstantMapper('filename'))
        knit = KnitVersionedFiles(None, access)
        records = [(('rev-id-1',), (('rev-id-1',), 0, len(gz_txt)))]
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter(records))
        # read_records_iter_raw will barf on bad gz data
        self.assertRaises(errors.KnitCorrupt, list,
            knit._read_records_iter_raw(records))


class LowLevelKnitIndexTests(TestCase):

    def get_knit_index(self, transport, name, mode):
        mapper = ConstantMapper(name)
        orig = knit._load_data
        def reset():
            knit._load_data = orig
        self.addCleanup(reset)
        from bzrlib._knit_load_data_py import _load_data_py
        knit._load_data = _load_data_py
        allow_writes = lambda: 'w' in mode
        return _KndxIndex(transport, mapper, lambda:None, allow_writes, lambda:True)

    def test_create_file(self):
        transport = MockTransport()
        index = self.get_knit_index(transport, "filename", "w")
        index.keys()
        call = transport.calls.pop(0)
        # call[1][1] is a StringIO - we can't test it by simple equality.
        self.assertEqual('put_file_non_atomic', call[0])
        self.assertEqual('filename.kndx', call[1][0])
        # With no history, _KndxIndex writes a new index:
        self.assertEqual(_KndxIndex.HEADER,
            call[1][1].getvalue())
        self.assertEqual({'create_parent_dir': True}, call[2])

    def test_read_utf8_version_id(self):
        unicode_revision_id = u"version-\N{CYRILLIC CAPITAL LETTER A}"
        utf8_revision_id = unicode_revision_id.encode('utf-8')
        transport = MockTransport([
            _KndxIndex.HEADER,
            '%s option 0 1 :' % (utf8_revision_id,)
            ])
        index = self.get_knit_index(transport, "filename", "r")
        # _KndxIndex is a private class, and deals in utf8 revision_ids, not
        # Unicode revision_ids.
        self.assertEqual({(utf8_revision_id,):()},
            index.get_parent_map(index.keys()))
        self.assertFalse((unicode_revision_id,) in index.keys())

    def test_read_utf8_parents(self):
        unicode_revision_id = u"version-\N{CYRILLIC CAPITAL LETTER A}"
        utf8_revision_id = unicode_revision_id.encode('utf-8')
        transport = MockTransport([
            _KndxIndex.HEADER,
            "version option 0 1 .%s :" % (utf8_revision_id,)
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertEqual({("version",):((utf8_revision_id,),)},
            index.get_parent_map(index.keys()))

    def test_read_ignore_corrupted_lines(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "corrupted",
            "corrupted options 0 1 .b .c ",
            "version options 0 1 :"
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertEqual(1, len(index.keys()))
        self.assertEqual(set([("version",)]), index.keys())

    def test_read_corrupted_header(self):
        transport = MockTransport(['not a bzr knit index header\n'])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertRaises(KnitHeaderError, index.keys)

    def test_read_duplicate_entries(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "parent options 0 1 :",
            "version options1 0 1 0 :",
            "version options2 1 2 .other :",
            "version options3 3 4 0 .other :"
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertEqual(2, len(index.keys()))
        # check that the index used is the first one written. (Specific
        # to KnitIndex style indices.
        self.assertEqual("1", index._dictionary_compress([("version",)]))
        self.assertEqual((("version",), 3, 4), index.get_position(("version",)))
        self.assertEqual(["options3"], index.get_options(("version",)))
        self.assertEqual({("version",):(("parent",), ("other",))},
            index.get_parent_map([("version",)]))

    def test_read_compressed_parents(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 1 :",
            "b option 0 1 0 :",
            "c option 0 1 1 0 :",
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertEqual({("b",):(("a",),), ("c",):(("b",), ("a",))},
            index.get_parent_map([("b",), ("c",)]))

    def test_write_utf8_version_id(self):
        unicode_revision_id = u"version-\N{CYRILLIC CAPITAL LETTER A}"
        utf8_revision_id = unicode_revision_id.encode('utf-8')
        transport = MockTransport([
            _KndxIndex.HEADER
            ])
        index = self.get_knit_index(transport, "filename", "r")
        index.add_records([
            ((utf8_revision_id,), ["option"], ((utf8_revision_id,), 0, 1), [])])
        call = transport.calls.pop(0)
        # call[1][1] is a StringIO - we can't test it by simple equality.
        self.assertEqual('put_file_non_atomic', call[0])
        self.assertEqual('filename.kndx', call[1][0])
        # With no history, _KndxIndex writes a new index:
        self.assertEqual(_KndxIndex.HEADER +
            "\n%s option 0 1  :" % (utf8_revision_id,),
            call[1][1].getvalue())
        self.assertEqual({'create_parent_dir': True}, call[2])

    def test_write_utf8_parents(self):
        unicode_revision_id = u"version-\N{CYRILLIC CAPITAL LETTER A}"
        utf8_revision_id = unicode_revision_id.encode('utf-8')
        transport = MockTransport([
            _KndxIndex.HEADER
            ])
        index = self.get_knit_index(transport, "filename", "r")
        index.add_records([
            (("version",), ["option"], (("version",), 0, 1), [(utf8_revision_id,)])])
        call = transport.calls.pop(0)
        # call[1][1] is a StringIO - we can't test it by simple equality.
        self.assertEqual('put_file_non_atomic', call[0])
        self.assertEqual('filename.kndx', call[1][0])
        # With no history, _KndxIndex writes a new index:
        self.assertEqual(_KndxIndex.HEADER +
            "\nversion option 0 1 .%s :" % (utf8_revision_id,),
            call[1][1].getvalue())
        self.assertEqual({'create_parent_dir': True}, call[2])

    def test_keys(self):
        transport = MockTransport([
            _KndxIndex.HEADER
            ])
        index = self.get_knit_index(transport, "filename", "r")

        self.assertEqual(set(), index.keys())

        index.add_records([(("a",), ["option"], (("a",), 0, 1), [])])
        self.assertEqual(set([("a",)]), index.keys())

        index.add_records([(("a",), ["option"], (("a",), 0, 1), [])])
        self.assertEqual(set([("a",)]), index.keys())

        index.add_records([(("b",), ["option"], (("b",), 0, 1), [])])
        self.assertEqual(set([("a",), ("b",)]), index.keys())

    def add_a_b(self, index, random_id=None):
        kwargs = {}
        if random_id is not None:
            kwargs["random_id"] = random_id
        index.add_records([
            (("a",), ["option"], (("a",), 0, 1), [("b",)]),
            (("a",), ["opt"], (("a",), 1, 2), [("c",)]),
            (("b",), ["option"], (("b",), 2, 3), [("a",)])
            ], **kwargs)

    def assertIndexIsAB(self, index):
        self.assertEqual({
            ('a',): (('c',),),
            ('b',): (('a',),),
            },
            index.get_parent_map(index.keys()))
        self.assertEqual((("a",), 1, 2), index.get_position(("a",)))
        self.assertEqual((("b",), 2, 3), index.get_position(("b",)))
        self.assertEqual(["opt"], index.get_options(("a",)))

    def test_add_versions(self):
        transport = MockTransport([
            _KndxIndex.HEADER
            ])
        index = self.get_knit_index(transport, "filename", "r")

        self.add_a_b(index)
        call = transport.calls.pop(0)
        # call[1][1] is a StringIO - we can't test it by simple equality.
        self.assertEqual('put_file_non_atomic', call[0])
        self.assertEqual('filename.kndx', call[1][0])
        # With no history, _KndxIndex writes a new index:
        self.assertEqual(
            _KndxIndex.HEADER +
            "\na option 0 1 .b :"
            "\na opt 1 2 .c :"
            "\nb option 2 3 0 :",
            call[1][1].getvalue())
        self.assertEqual({'create_parent_dir': True}, call[2])
        self.assertIndexIsAB(index)

    def test_add_versions_random_id_is_accepted(self):
        transport = MockTransport([
            _KndxIndex.HEADER
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.add_a_b(index, random_id=True)

    def test_delay_create_and_add_versions(self):
        transport = MockTransport()

        index = self.get_knit_index(transport, "filename", "w")
        # dir_mode=0777)
        self.assertEqual([], transport.calls)
        self.add_a_b(index)
        #self.assertEqual(
        #[    {"dir_mode": 0777, "create_parent_dir": True, "mode": "wb"},
        #    kwargs)
        # Two calls: one during which we load the existing index (and when its
        # missing create it), then a second where we write the contents out.
        self.assertEqual(2, len(transport.calls))
        call = transport.calls.pop(0)
        self.assertEqual('put_file_non_atomic', call[0])
        self.assertEqual('filename.kndx', call[1][0])
        # With no history, _KndxIndex writes a new index:
        self.assertEqual(_KndxIndex.HEADER, call[1][1].getvalue())
        self.assertEqual({'create_parent_dir': True}, call[2])
        call = transport.calls.pop(0)
        # call[1][1] is a StringIO - we can't test it by simple equality.
        self.assertEqual('put_file_non_atomic', call[0])
        self.assertEqual('filename.kndx', call[1][0])
        # With no history, _KndxIndex writes a new index:
        self.assertEqual(
            _KndxIndex.HEADER +
            "\na option 0 1 .b :"
            "\na opt 1 2 .c :"
            "\nb option 2 3 0 :",
            call[1][1].getvalue())
        self.assertEqual({'create_parent_dir': True}, call[2])

    def test_get_position(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 1 :",
            "b option 1 2 :"
            ])
        index = self.get_knit_index(transport, "filename", "r")

        self.assertEqual((("a",), 0, 1), index.get_position(("a",)))
        self.assertEqual((("b",), 1, 2), index.get_position(("b",)))

    def test_get_method(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a fulltext,unknown 0 1 :",
            "b unknown,line-delta 1 2 :",
            "c bad 3 4 :"
            ])
        index = self.get_knit_index(transport, "filename", "r")

        self.assertEqual("fulltext", index.get_method("a"))
        self.assertEqual("line-delta", index.get_method("b"))
        self.assertRaises(errors.KnitIndexUnknownMethod, index.get_method, "c")

    def test_get_options(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a opt1 0 1 :",
            "b opt2,opt3 1 2 :"
            ])
        index = self.get_knit_index(transport, "filename", "r")

        self.assertEqual(["opt1"], index.get_options("a"))
        self.assertEqual(["opt2", "opt3"], index.get_options("b"))

    def test_get_parent_map(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 1 :",
            "b option 1 2 0 .c :",
            "c option 1 2 1 0 .e :"
            ])
        index = self.get_knit_index(transport, "filename", "r")

        self.assertEqual({
            ("a",):(),
            ("b",):(("a",), ("c",)),
            ("c",):(("b",), ("a",), ("e",)),
            }, index.get_parent_map(index.keys()))

    def test_impossible_parent(self):
        """Test we get KnitCorrupt if the parent couldn't possibly exist."""
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 1 :",
            "b option 0 1 4 :"  # We don't have a 4th record
            ])
        index = self.get_knit_index(transport, 'filename', 'r')
        try:
            self.assertRaises(errors.KnitCorrupt, index.keys)
        except TypeError, e:
            if (str(e) == ('exceptions must be strings, classes, or instances,'
                           ' not exceptions.IndexError')
                and sys.version_info[0:2] >= (2,5)):
                self.knownFailure('Pyrex <0.9.5 fails with TypeError when'
                                  ' raising new style exceptions with python'
                                  ' >=2.5')
            else:
                raise

    def test_corrupted_parent(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 1 :",
            "b option 0 1 :",
            "c option 0 1 1v :", # Can't have a parent of '1v'
            ])
        index = self.get_knit_index(transport, 'filename', 'r')
        try:
            self.assertRaises(errors.KnitCorrupt, index.keys)
        except TypeError, e:
            if (str(e) == ('exceptions must be strings, classes, or instances,'
                           ' not exceptions.ValueError')
                and sys.version_info[0:2] >= (2,5)):
                self.knownFailure('Pyrex <0.9.5 fails with TypeError when'
                                  ' raising new style exceptions with python'
                                  ' >=2.5')
            else:
                raise

    def test_corrupted_parent_in_list(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 1 :",
            "b option 0 1 :",
            "c option 0 1 1 v :", # Can't have a parent of 'v'
            ])
        index = self.get_knit_index(transport, 'filename', 'r')
        try:
            self.assertRaises(errors.KnitCorrupt, index.keys)
        except TypeError, e:
            if (str(e) == ('exceptions must be strings, classes, or instances,'
                           ' not exceptions.ValueError')
                and sys.version_info[0:2] >= (2,5)):
                self.knownFailure('Pyrex <0.9.5 fails with TypeError when'
                                  ' raising new style exceptions with python'
                                  ' >=2.5')
            else:
                raise

    def test_invalid_position(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 1v 1 :",
            ])
        index = self.get_knit_index(transport, 'filename', 'r')
        try:
            self.assertRaises(errors.KnitCorrupt, index.keys)
        except TypeError, e:
            if (str(e) == ('exceptions must be strings, classes, or instances,'
                           ' not exceptions.ValueError')
                and sys.version_info[0:2] >= (2,5)):
                self.knownFailure('Pyrex <0.9.5 fails with TypeError when'
                                  ' raising new style exceptions with python'
                                  ' >=2.5')
            else:
                raise

    def test_invalid_size(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 1 1v :",
            ])
        index = self.get_knit_index(transport, 'filename', 'r')
        try:
            self.assertRaises(errors.KnitCorrupt, index.keys)
        except TypeError, e:
            if (str(e) == ('exceptions must be strings, classes, or instances,'
                           ' not exceptions.ValueError')
                and sys.version_info[0:2] >= (2,5)):
                self.knownFailure('Pyrex <0.9.5 fails with TypeError when'
                                  ' raising new style exceptions with python'
                                  ' >=2.5')
            else:
                raise

    def test_short_line(self):
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 10  :",
            "b option 10 10 0", # This line isn't terminated, ignored
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertEqual(set([('a',)]), index.keys())

    def test_skip_incomplete_record(self):
        # A line with bogus data should just be skipped
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 10  :",
            "b option 10 10 0", # This line isn't terminated, ignored
            "c option 20 10 0 :", # Properly terminated, and starts with '\n'
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertEqual(set([('a',), ('c',)]), index.keys())

    def test_trailing_characters(self):
        # A line with bogus data should just be skipped
        transport = MockTransport([
            _KndxIndex.HEADER,
            "a option 0 10  :",
            "b option 10 10 0 :a", # This line has extra trailing characters
            "c option 20 10 0 :", # Properly terminated, and starts with '\n'
            ])
        index = self.get_knit_index(transport, "filename", "r")
        self.assertEqual(set([('a',), ('c',)]), index.keys())


class LowLevelKnitIndexTests_c(LowLevelKnitIndexTests):

    _test_needs_features = [CompiledKnitFeature]

    def get_knit_index(self, transport, name, mode):
        mapper = ConstantMapper(name)
        orig = knit._load_data
        def reset():
            knit._load_data = orig
        self.addCleanup(reset)
        from bzrlib._knit_load_data_c import _load_data_c
        knit._load_data = _load_data_c
        allow_writes = lambda: mode == 'w'
        return _KndxIndex(transport, mapper, lambda:None, allow_writes, lambda:True)


class KnitTests(TestCaseWithTransport):
    """Class containing knit test helper routines."""

    def make_test_knit(self, annotate=False, name='test'):
        mapper = ConstantMapper(name)
        return make_file_factory(annotate, mapper)(self.get_transport())


class TestBadShaError(KnitTests):
    """Tests for handling of sha errors."""

    def test_exception_has_text(self):
        # having the failed text included in the error allows for recovery.
        source = self.make_test_knit()
        target = self.make_test_knit(name="target")
        if not source._max_delta_chain:
            raise TestNotApplicable(
                "cannot get delta-caused sha failures without deltas.")
        # create a basis
        basis = ('basis',)
        broken = ('broken',)
        source.add_lines(basis, (), ['foo\n'])
        source.add_lines(broken, (basis,), ['foo\n', 'bar\n'])
        # Seed target with a bad basis text
        target.add_lines(basis, (), ['gam\n'])
        target.insert_record_stream(
            source.get_record_stream([broken], 'unordered', False))
        err = self.assertRaises(errors.KnitCorrupt,
            target.get_record_stream([broken], 'unordered', True).next)
        self.assertEqual(['gam\n', 'bar\n'], err.content)
        # Test for formatting with live data
        self.assertStartsWith(str(err), "Knit ")


class TestKnitIndex(KnitTests):

    def test_add_versions_dictionary_compresses(self):
        """Adding versions to the index should update the lookup dict"""
        knit = self.make_test_knit()
        idx = knit._index
        idx.add_records([(('a-1',), ['fulltext'], (('a-1',), 0, 0), [])])
        self.check_file_contents('test.kndx',
            '# bzr knit index 8\n'
            '\n'
            'a-1 fulltext 0 0  :'
            )
        idx.add_records([
            (('a-2',), ['fulltext'], (('a-2',), 0, 0), [('a-1',)]),
            (('a-3',), ['fulltext'], (('a-3',), 0, 0), [('a-2',)]),
            ])
        self.check_file_contents('test.kndx',
            '# bzr knit index 8\n'
            '\n'
            'a-1 fulltext 0 0  :\n'
            'a-2 fulltext 0 0 0 :\n'
            'a-3 fulltext 0 0 1 :'
            )
        self.assertEqual(set([('a-3',), ('a-1',), ('a-2',)]), idx.keys())
        self.assertEqual({
            ('a-1',): ((('a-1',), 0, 0), None, (), ('fulltext', False)),
            ('a-2',): ((('a-2',), 0, 0), None, (('a-1',),), ('fulltext', False)),
            ('a-3',): ((('a-3',), 0, 0), None, (('a-2',),), ('fulltext', False)),
            }, idx.get_build_details(idx.keys()))
        self.assertEqual({('a-1',):(),
            ('a-2',):(('a-1',),),
            ('a-3',):(('a-2',),),},
            idx.get_parent_map(idx.keys()))

    def test_add_versions_fails_clean(self):
        """If add_versions fails in the middle, it restores a pristine state.

        Any modifications that are made to the index are reset if all versions
        cannot be added.
        """
        # This cheats a little bit by passing in a generator which will
        # raise an exception before the processing finishes
        # Other possibilities would be to have an version with the wrong number
        # of entries, or to make the backing transport unable to write any
        # files.

        knit = self.make_test_knit()
        idx = knit._index
        idx.add_records([(('a-1',), ['fulltext'], (('a-1',), 0, 0), [])])

        class StopEarly(Exception):
            pass

        def generate_failure():
            """Add some entries and then raise an exception"""
            yield (('a-2',), ['fulltext'], (None, 0, 0), ('a-1',))
            yield (('a-3',), ['fulltext'], (None, 0, 0), ('a-2',))
            raise StopEarly()

        # Assert the pre-condition
        def assertA1Only():
            self.assertEqual(set([('a-1',)]), set(idx.keys()))
            self.assertEqual(
                {('a-1',): ((('a-1',), 0, 0), None, (), ('fulltext', False))},
                idx.get_build_details([('a-1',)]))
            self.assertEqual({('a-1',):()}, idx.get_parent_map(idx.keys()))

        assertA1Only()
        self.assertRaises(StopEarly, idx.add_records, generate_failure())
        # And it shouldn't be modified
        assertA1Only()

    def test_knit_index_ignores_empty_files(self):
        # There was a race condition in older bzr, where a ^C at the right time
        # could leave an empty .kndx file, which bzr would later claim was a
        # corrupted file since the header was not present. In reality, the file
        # just wasn't created, so it should be ignored.
        t = get_transport('.')
        t.put_bytes('test.kndx', '')

        knit = self.make_test_knit()

    def test_knit_index_checks_header(self):
        t = get_transport('.')
        t.put_bytes('test.kndx', '# not really a knit header\n\n')
        k = self.make_test_knit()
        self.assertRaises(KnitHeaderError, k.keys)


class TestGraphIndexKnit(KnitTests):
    """Tests for knits using a GraphIndex rather than a KnitIndex."""

    def make_g_index(self, name, ref_lists=0, nodes=[]):
        builder = GraphIndexBuilder(ref_lists)
        for node, references, value in nodes:
            builder.add_node(node, references, value)
        stream = builder.finish()
        trans = self.get_transport()
        size = trans.put_file(name, stream)
        return GraphIndex(trans, name, size)

    def two_graph_index(self, deltas=False, catch_adds=False):
        """Build a two-graph index.

        :param deltas: If true, use underlying indices with two node-ref
            lists and 'parent' set to a delta-compressed against tail.
        """
        # build a complex graph across several indices.
        if deltas:
            # delta compression inn the index
            index1 = self.make_g_index('1', 2, [
                (('tip', ), 'N0 100', ([('parent', )], [], )),
                (('tail', ), '', ([], []))])
            index2 = self.make_g_index('2', 2, [
                (('parent', ), ' 100 78', ([('tail', ), ('ghost', )], [('tail', )])),
                (('separate', ), '', ([], []))])
        else:
            # just blob location and graph in the index.
            index1 = self.make_g_index('1', 1, [
                (('tip', ), 'N0 100', ([('parent', )], )),
                (('tail', ), '', ([], ))])
            index2 = self.make_g_index('2', 1, [
                (('parent', ), ' 100 78', ([('tail', ), ('ghost', )], )),
                (('separate', ), '', ([], ))])
        combined_index = CombinedGraphIndex([index1, index2])
        if catch_adds:
            self.combined_index = combined_index
            self.caught_entries = []
            add_callback = self.catch_add
        else:
            add_callback = None
        return _KnitGraphIndex(combined_index, lambda:True, deltas=deltas,
            add_callback=add_callback)

    def test_keys(self):
        index = self.two_graph_index()
        self.assertEqual(set([('tail',), ('tip',), ('parent',), ('separate',)]),
            set(index.keys()))

    def test_get_position(self):
        index = self.two_graph_index()
        self.assertEqual((index._graph_index._indices[0], 0, 100), index.get_position(('tip',)))
        self.assertEqual((index._graph_index._indices[1], 100, 78), index.get_position(('parent',)))

    def test_get_method_deltas(self):
        index = self.two_graph_index(deltas=True)
        self.assertEqual('fulltext', index.get_method(('tip',)))
        self.assertEqual('line-delta', index.get_method(('parent',)))

    def test_get_method_no_deltas(self):
        # check that the parent-history lookup is ignored with deltas=False.
        index = self.two_graph_index(deltas=False)
        self.assertEqual('fulltext', index.get_method(('tip',)))
        self.assertEqual('fulltext', index.get_method(('parent',)))

    def test_get_options_deltas(self):
        index = self.two_graph_index(deltas=True)
        self.assertEqual(['fulltext', 'no-eol'], index.get_options(('tip',)))
        self.assertEqual(['line-delta'], index.get_options(('parent',)))

    def test_get_options_no_deltas(self):
        # check that the parent-history lookup is ignored with deltas=False.
        index = self.two_graph_index(deltas=False)
        self.assertEqual(['fulltext', 'no-eol'], index.get_options(('tip',)))
        self.assertEqual(['fulltext'], index.get_options(('parent',)))

    def test_get_parent_map(self):
        index = self.two_graph_index()
        self.assertEqual({('parent',):(('tail',), ('ghost',))},
            index.get_parent_map([('parent',), ('ghost',)]))

    def catch_add(self, entries):
        self.caught_entries.append(entries)

    def test_add_no_callback_errors(self):
        index = self.two_graph_index()
        self.assertRaises(errors.ReadOnlyError, index.add_records,
            [(('new',), 'fulltext,no-eol', (None, 50, 60), ['separate'])])

    def test_add_version_smoke(self):
        index = self.two_graph_index(catch_adds=True)
        index.add_records([(('new',), 'fulltext,no-eol', (None, 50, 60),
            [('separate',)])])
        self.assertEqual([[(('new', ), 'N50 60', ((('separate',),),))]],
            self.caught_entries)

    def test_add_version_delta_not_delta_index(self):
        index = self.two_graph_index(catch_adds=True)
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('new',), 'no-eol,line-delta', (None, 0, 100), [('parent',)])])
        self.assertEqual([], self.caught_entries)

    def test_add_version_same_dup(self):
        index = self.two_graph_index(catch_adds=True)
        # options can be spelt two different ways
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 100), [('parent',)])])
        index.add_records([(('tip',), 'no-eol,fulltext', (None, 0, 100), [('parent',)])])
        # position/length are ignored (because each pack could have fulltext or
        # delta, and be at a different position.
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 50, 100),
            [('parent',)])])
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 1000),
            [('parent',)])])
        # but neither should have added data:
        self.assertEqual([[], [], [], []], self.caught_entries)
        
    def test_add_version_different_dup(self):
        index = self.two_graph_index(deltas=True, catch_adds=True)
        # change options
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'no-eol,line-delta', (None, 0, 100), [('parent',)])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'line-delta,no-eol', (None, 0, 100), [('parent',)])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext', (None, 0, 100), [('parent',)])])
        # parents
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext,no-eol', (None, 0, 100), [])])
        self.assertEqual([], self.caught_entries)
        
    def test_add_versions_nodeltas(self):
        index = self.two_graph_index(catch_adds=True)
        index.add_records([
                (('new',), 'fulltext,no-eol', (None, 50, 60), [('separate',)]),
                (('new2',), 'fulltext', (None, 0, 6), [('new',)]),
                ])
        self.assertEqual([(('new', ), 'N50 60', ((('separate',),),)),
            (('new2', ), ' 0 6', ((('new',),),))],
            sorted(self.caught_entries[0]))
        self.assertEqual(1, len(self.caught_entries))

    def test_add_versions_deltas(self):
        index = self.two_graph_index(deltas=True, catch_adds=True)
        index.add_records([
                (('new',), 'fulltext,no-eol', (None, 50, 60), [('separate',)]),
                (('new2',), 'line-delta', (None, 0, 6), [('new',)]),
                ])
        self.assertEqual([(('new', ), 'N50 60', ((('separate',),), ())),
            (('new2', ), ' 0 6', ((('new',),), (('new',),), ))],
            sorted(self.caught_entries[0]))
        self.assertEqual(1, len(self.caught_entries))

    def test_add_versions_delta_not_delta_index(self):
        index = self.two_graph_index(catch_adds=True)
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('new',), 'no-eol,line-delta', (None, 0, 100), [('parent',)])])
        self.assertEqual([], self.caught_entries)

    def test_add_versions_random_id_accepted(self):
        index = self.two_graph_index(catch_adds=True)
        index.add_records([], random_id=True)

    def test_add_versions_same_dup(self):
        index = self.two_graph_index(catch_adds=True)
        # options can be spelt two different ways
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 100),
            [('parent',)])])
        index.add_records([(('tip',), 'no-eol,fulltext', (None, 0, 100),
            [('parent',)])])
        # position/length are ignored (because each pack could have fulltext or
        # delta, and be at a different position.
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 50, 100),
            [('parent',)])])
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 1000),
            [('parent',)])])
        # but neither should have added data.
        self.assertEqual([[], [], [], []], self.caught_entries)
        
    def test_add_versions_different_dup(self):
        index = self.two_graph_index(deltas=True, catch_adds=True)
        # change options
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'no-eol,line-delta', (None, 0, 100), [('parent',)])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'line-delta,no-eol', (None, 0, 100), [('parent',)])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext', (None, 0, 100), [('parent',)])])
        # parents
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext,no-eol', (None, 0, 100), [])])
        # change options in the second record
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext,no-eol', (None, 0, 100), [('parent',)]),
             (('tip',), 'no-eol,line-delta', (None, 0, 100), [('parent',)])])
        self.assertEqual([], self.caught_entries)


class TestNoParentsGraphIndexKnit(KnitTests):
    """Tests for knits using _KnitGraphIndex with no parents."""

    def make_g_index(self, name, ref_lists=0, nodes=[]):
        builder = GraphIndexBuilder(ref_lists)
        for node, references in nodes:
            builder.add_node(node, references)
        stream = builder.finish()
        trans = self.get_transport()
        size = trans.put_file(name, stream)
        return GraphIndex(trans, name, size)

    def test_parents_deltas_incompatible(self):
        index = CombinedGraphIndex([])
        self.assertRaises(errors.KnitError, _KnitGraphIndex, lambda:True,
            index, deltas=True, parents=False)

    def two_graph_index(self, catch_adds=False):
        """Build a two-graph index.

        :param deltas: If true, use underlying indices with two node-ref
            lists and 'parent' set to a delta-compressed against tail.
        """
        # put several versions in the index.
        index1 = self.make_g_index('1', 0, [
            (('tip', ), 'N0 100'),
            (('tail', ), '')])
        index2 = self.make_g_index('2', 0, [
            (('parent', ), ' 100 78'),
            (('separate', ), '')])
        combined_index = CombinedGraphIndex([index1, index2])
        if catch_adds:
            self.combined_index = combined_index
            self.caught_entries = []
            add_callback = self.catch_add
        else:
            add_callback = None
        return _KnitGraphIndex(combined_index, lambda:True, parents=False,
            add_callback=add_callback)

    def test_keys(self):
        index = self.two_graph_index()
        self.assertEqual(set([('tail',), ('tip',), ('parent',), ('separate',)]),
            set(index.keys()))

    def test_get_position(self):
        index = self.two_graph_index()
        self.assertEqual((index._graph_index._indices[0], 0, 100),
            index.get_position(('tip',)))
        self.assertEqual((index._graph_index._indices[1], 100, 78),
            index.get_position(('parent',)))

    def test_get_method(self):
        index = self.two_graph_index()
        self.assertEqual('fulltext', index.get_method(('tip',)))
        self.assertEqual(['fulltext'], index.get_options(('parent',)))

    def test_get_options(self):
        index = self.two_graph_index()
        self.assertEqual(['fulltext', 'no-eol'], index.get_options(('tip',)))
        self.assertEqual(['fulltext'], index.get_options(('parent',)))

    def test_get_parent_map(self):
        index = self.two_graph_index()
        self.assertEqual({('parent',):None},
            index.get_parent_map([('parent',), ('ghost',)]))

    def catch_add(self, entries):
        self.caught_entries.append(entries)

    def test_add_no_callback_errors(self):
        index = self.two_graph_index()
        self.assertRaises(errors.ReadOnlyError, index.add_records,
            [(('new',), 'fulltext,no-eol', (None, 50, 60), [('separate',)])])

    def test_add_version_smoke(self):
        index = self.two_graph_index(catch_adds=True)
        index.add_records([(('new',), 'fulltext,no-eol', (None, 50, 60), [])])
        self.assertEqual([[(('new', ), 'N50 60')]],
            self.caught_entries)

    def test_add_version_delta_not_delta_index(self):
        index = self.two_graph_index(catch_adds=True)
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('new',), 'no-eol,line-delta', (None, 0, 100), [])])
        self.assertEqual([], self.caught_entries)

    def test_add_version_same_dup(self):
        index = self.two_graph_index(catch_adds=True)
        # options can be spelt two different ways
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 100), [])])
        index.add_records([(('tip',), 'no-eol,fulltext', (None, 0, 100), [])])
        # position/length are ignored (because each pack could have fulltext or
        # delta, and be at a different position.
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 50, 100), [])])
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 1000), [])])
        # but neither should have added data.
        self.assertEqual([[], [], [], []], self.caught_entries)
        
    def test_add_version_different_dup(self):
        index = self.two_graph_index(catch_adds=True)
        # change options
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'no-eol,line-delta', (None, 0, 100), [])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'line-delta,no-eol', (None, 0, 100), [])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext', (None, 0, 100), [])])
        # parents
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext,no-eol', (None, 0, 100), [('parent',)])])
        self.assertEqual([], self.caught_entries)
        
    def test_add_versions(self):
        index = self.two_graph_index(catch_adds=True)
        index.add_records([
                (('new',), 'fulltext,no-eol', (None, 50, 60), []),
                (('new2',), 'fulltext', (None, 0, 6), []),
                ])
        self.assertEqual([(('new', ), 'N50 60'), (('new2', ), ' 0 6')],
            sorted(self.caught_entries[0]))
        self.assertEqual(1, len(self.caught_entries))

    def test_add_versions_delta_not_delta_index(self):
        index = self.two_graph_index(catch_adds=True)
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('new',), 'no-eol,line-delta', (None, 0, 100), [('parent',)])])
        self.assertEqual([], self.caught_entries)

    def test_add_versions_parents_not_parents_index(self):
        index = self.two_graph_index(catch_adds=True)
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('new',), 'no-eol,fulltext', (None, 0, 100), [('parent',)])])
        self.assertEqual([], self.caught_entries)

    def test_add_versions_random_id_accepted(self):
        index = self.two_graph_index(catch_adds=True)
        index.add_records([], random_id=True)

    def test_add_versions_same_dup(self):
        index = self.two_graph_index(catch_adds=True)
        # options can be spelt two different ways
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 100), [])])
        index.add_records([(('tip',), 'no-eol,fulltext', (None, 0, 100), [])])
        # position/length are ignored (because each pack could have fulltext or
        # delta, and be at a different position.
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 50, 100), [])])
        index.add_records([(('tip',), 'fulltext,no-eol', (None, 0, 1000), [])])
        # but neither should have added data.
        self.assertEqual([[], [], [], []], self.caught_entries)
        
    def test_add_versions_different_dup(self):
        index = self.two_graph_index(catch_adds=True)
        # change options
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'no-eol,line-delta', (None, 0, 100), [])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'line-delta,no-eol', (None, 0, 100), [])])
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext', (None, 0, 100), [])])
        # parents
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext,no-eol', (None, 0, 100), [('parent',)])])
        # change options in the second record
        self.assertRaises(errors.KnitCorrupt, index.add_records,
            [(('tip',), 'fulltext,no-eol', (None, 0, 100), []),
             (('tip',), 'no-eol,line-delta', (None, 0, 100), [])])
        self.assertEqual([], self.caught_entries)


class TestStacking(KnitTests):

    def get_basis_and_test_knit(self):
        basis = self.make_test_knit(name='basis')
        basis = RecordingVersionedFilesDecorator(basis)
        test = self.make_test_knit(name='test')
        test.add_fallback_versioned_files(basis)
        return basis, test

    def test_add_fallback_versioned_files(self):
        basis = self.make_test_knit(name='basis')
        test = self.make_test_knit(name='test')
        # It must not error; other tests test that the fallback is referred to
        # when accessing data.
        test.add_fallback_versioned_files(basis)

    def test_add_lines(self):
        # lines added to the test are not added to the basis
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_cross_border = ('quux',)
        key_delta = ('zaphod',)
        test.add_lines(key, (), ['foo\n'])
        self.assertEqual({}, basis.get_parent_map([key]))
        # lines added to the test that reference across the stack do a
        # fulltext.
        basis.add_lines(key_basis, (), ['foo\n'])
        basis.calls = []
        test.add_lines(key_cross_border, (key_basis,), ['foo\n'])
        self.assertEqual('fulltext', test._index.get_method(key_cross_border))
        self.assertEqual([("get_parent_map", set([key_basis]))], basis.calls)
        # Subsequent adds do delta.
        basis.calls = []
        test.add_lines(key_delta, (key_cross_border,), ['foo\n'])
        self.assertEqual('line-delta', test._index.get_method(key_delta))
        self.assertEqual([], basis.calls)

    def test_annotate(self):
        # annotations from the test knit are answered without asking the basis
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_missing = ('missing',)
        test.add_lines(key, (), ['foo\n'])
        details = test.annotate(key)
        self.assertEqual([(key, 'foo\n')], details)
        self.assertEqual([], basis.calls)
        # But texts that are not in the test knit are looked for in the basis
        # directly.
        basis.add_lines(key_basis, (), ['foo\n', 'bar\n'])
        basis.calls = []
        details = test.annotate(key_basis)
        self.assertEqual([(key_basis, 'foo\n'), (key_basis, 'bar\n')], details)
        # Not optimised to date:
        # self.assertEqual([("annotate", key_basis)], basis.calls)
        self.assertEqual([('get_parent_map', set([key_basis])),
            ('get_parent_map', set([key_basis])),
            ('get_parent_map', set([key_basis])),
            ('get_record_stream', [key_basis], 'unordered', True)],
            basis.calls)

    def test_check(self):
        # At the moment checking a stacked knit does implicitly check the
        # fallback files.  
        basis, test = self.get_basis_and_test_knit()
        test.check()

    def test_get_parent_map(self):
        # parents in the test knit are answered without asking the basis
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_missing = ('missing',)
        test.add_lines(key, (), [])
        parent_map = test.get_parent_map([key])
        self.assertEqual({key: ()}, parent_map)
        self.assertEqual([], basis.calls)
        # But parents that are not in the test knit are looked for in the basis
        basis.add_lines(key_basis, (), [])
        basis.calls = []
        parent_map = test.get_parent_map([key, key_basis, key_missing])
        self.assertEqual({key: (),
            key_basis: ()}, parent_map)
        self.assertEqual([("get_parent_map", set([key_basis, key_missing]))],
            basis.calls)

    def test_get_record_stream_unordered_fulltexts(self):
        # records from the test knit are answered without asking the basis:
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_missing = ('missing',)
        test.add_lines(key, (), ['foo\n'])
        records = list(test.get_record_stream([key], 'unordered', True))
        self.assertEqual(1, len(records))
        self.assertEqual([], basis.calls)
        # Missing (from test knit) objects are retrieved from the basis:
        basis.add_lines(key_basis, (), ['foo\n', 'bar\n'])
        basis.calls = []
        records = list(test.get_record_stream([key_basis, key_missing],
            'unordered', True))
        self.assertEqual(2, len(records))
        calls = list(basis.calls)
        for record in records:
            self.assertSubset([record.key], (key_basis, key_missing))
            if record.key == key_missing:
                self.assertIsInstance(record, AbsentContentFactory)
            else:
                reference = list(basis.get_record_stream([key_basis],
                    'unordered', True))[0]
                self.assertEqual(reference.key, record.key)
                self.assertEqual(reference.sha1, record.sha1)
                self.assertEqual(reference.storage_kind, record.storage_kind)
                self.assertEqual(reference.get_bytes_as(reference.storage_kind),
                    record.get_bytes_as(record.storage_kind))
                self.assertEqual(reference.get_bytes_as('fulltext'),
                    record.get_bytes_as('fulltext'))
        # It's not strictly minimal, but it seems reasonable for now for it to
        # ask which fallbacks have which parents.
        self.assertEqual([
            ("get_parent_map", set([key_basis, key_missing])),
            ("get_record_stream", [key_basis], 'unordered', True)],
            calls)

    def test_get_record_stream_ordered_fulltexts(self):
        # ordering is preserved down into the fallback store.
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_basis_2 = ('quux',)
        key_missing = ('missing',)
        test.add_lines(key, (key_basis,), ['foo\n'])
        # Missing (from test knit) objects are retrieved from the basis:
        basis.add_lines(key_basis, (key_basis_2,), ['foo\n', 'bar\n'])
        basis.add_lines(key_basis_2, (), ['quux\n'])
        basis.calls = []
        # ask for in non-topological order
        records = list(test.get_record_stream(
            [key, key_basis, key_missing, key_basis_2], 'topological', True))
        self.assertEqual(4, len(records))
        results = []
        for record in records:
            self.assertSubset([record.key],
                (key_basis, key_missing, key_basis_2, key))
            if record.key == key_missing:
                self.assertIsInstance(record, AbsentContentFactory)
            else:
                results.append((record.key, record.sha1, record.storage_kind,
                    record.get_bytes_as('fulltext')))
        calls = list(basis.calls)
        order = [record[0] for record in results]
        self.assertEqual([key_basis_2, key_basis, key], order)
        for result in results:
            if result[0] == key:
                source = test
            else:
                source = basis
            record = source.get_record_stream([result[0]], 'unordered',
                True).next()
            self.assertEqual(record.key, result[0])
            self.assertEqual(record.sha1, result[1])
            self.assertEqual(record.storage_kind, result[2])
            self.assertEqual(record.get_bytes_as('fulltext'), result[3])
        # It's not strictly minimal, but it seems reasonable for now for it to
        # ask which fallbacks have which parents.
        self.assertEqual([
            ("get_parent_map", set([key_basis, key_basis_2, key_missing])),
            # unordered is asked for by the underlying worker as it still
            # buffers everything while answering - which is a problem!
            ("get_record_stream", [key_basis_2, key_basis], 'unordered', True)],
            calls)

    def test_get_record_stream_unordered_deltas(self):
        # records from the test knit are answered without asking the basis:
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_missing = ('missing',)
        test.add_lines(key, (), ['foo\n'])
        records = list(test.get_record_stream([key], 'unordered', False))
        self.assertEqual(1, len(records))
        self.assertEqual([], basis.calls)
        # Missing (from test knit) objects are retrieved from the basis:
        basis.add_lines(key_basis, (), ['foo\n', 'bar\n'])
        basis.calls = []
        records = list(test.get_record_stream([key_basis, key_missing],
            'unordered', False))
        self.assertEqual(2, len(records))
        calls = list(basis.calls)
        for record in records:
            self.assertSubset([record.key], (key_basis, key_missing))
            if record.key == key_missing:
                self.assertIsInstance(record, AbsentContentFactory)
            else:
                reference = list(basis.get_record_stream([key_basis],
                    'unordered', False))[0]
                self.assertEqual(reference.key, record.key)
                self.assertEqual(reference.sha1, record.sha1)
                self.assertEqual(reference.storage_kind, record.storage_kind)
                self.assertEqual(reference.get_bytes_as(reference.storage_kind),
                    record.get_bytes_as(record.storage_kind))
        # It's not strictly minimal, but it seems reasonable for now for it to
        # ask which fallbacks have which parents.
        self.assertEqual([
            ("get_parent_map", set([key_basis, key_missing])),
            ("get_record_stream", [key_basis], 'unordered', False)],
            calls)

    def test_get_record_stream_ordered_deltas(self):
        # ordering is preserved down into the fallback store.
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_basis_2 = ('quux',)
        key_missing = ('missing',)
        test.add_lines(key, (key_basis,), ['foo\n'])
        # Missing (from test knit) objects are retrieved from the basis:
        basis.add_lines(key_basis, (key_basis_2,), ['foo\n', 'bar\n'])
        basis.add_lines(key_basis_2, (), ['quux\n'])
        basis.calls = []
        # ask for in non-topological order
        records = list(test.get_record_stream(
            [key, key_basis, key_missing, key_basis_2], 'topological', False))
        self.assertEqual(4, len(records))
        results = []
        for record in records:
            self.assertSubset([record.key],
                (key_basis, key_missing, key_basis_2, key))
            if record.key == key_missing:
                self.assertIsInstance(record, AbsentContentFactory)
            else:
                results.append((record.key, record.sha1, record.storage_kind,
                    record.get_bytes_as(record.storage_kind)))
        calls = list(basis.calls)
        order = [record[0] for record in results]
        self.assertEqual([key_basis_2, key_basis, key], order)
        for result in results:
            if result[0] == key:
                source = test
            else:
                source = basis
            record = source.get_record_stream([result[0]], 'unordered',
                False).next()
            self.assertEqual(record.key, result[0])
            self.assertEqual(record.sha1, result[1])
            self.assertEqual(record.storage_kind, result[2])
            self.assertEqual(record.get_bytes_as(record.storage_kind), result[3])
        # It's not strictly minimal, but it seems reasonable for now for it to
        # ask which fallbacks have which parents.
        self.assertEqual([
            ("get_parent_map", set([key_basis, key_basis_2, key_missing])),
            ("get_record_stream", [key_basis_2, key_basis], 'topological', False)],
            calls)

    def test_get_sha1s(self):
        # sha1's in the test knit are answered without asking the basis
        basis, test = self.get_basis_and_test_knit()
        key = ('foo',)
        key_basis = ('bar',)
        key_missing = ('missing',)
        test.add_lines(key, (), ['foo\n'])
        key_sha1sum = osutils.sha('foo\n').hexdigest()
        sha1s = test.get_sha1s([key])
        self.assertEqual({key: key_sha1sum}, sha1s)
        self.assertEqual([], basis.calls)
        # But texts that are not in the test knit are looked for in the basis
        # directly (rather than via text reconstruction) so that remote servers
        # etc don't have to answer with full content.
        basis.add_lines(key_basis, (), ['foo\n', 'bar\n'])
        basis_sha1sum = osutils.sha('foo\nbar\n').hexdigest()
        basis.calls = []
        sha1s = test.get_sha1s([key, key_missing, key_basis])
        self.assertEqual({key: key_sha1sum,
            key_basis: basis_sha1sum}, sha1s)
        self.assertEqual([("get_sha1s", set([key_basis, key_missing]))],
            basis.calls)

    def test_insert_record_stream(self):
        # records are inserted as normal; insert_record_stream builds on
        # add_lines, so a smoke test should be all that's needed:
        key = ('foo',)
        key_basis = ('bar',)
        key_delta = ('zaphod',)
        basis, test = self.get_basis_and_test_knit()
        source = self.make_test_knit(name='source')
        basis.add_lines(key_basis, (), ['foo\n'])
        basis.calls = []
        source.add_lines(key_basis, (), ['foo\n'])
        source.add_lines(key_delta, (key_basis,), ['bar\n'])
        stream = source.get_record_stream([key_delta], 'unordered', False)
        test.insert_record_stream(stream)
        self.assertEqual([("get_parent_map", set([key_basis]))],
            basis.calls)
        self.assertEqual({key_delta:(key_basis,)},
            test.get_parent_map([key_delta]))
        self.assertEqual('bar\n', test.get_record_stream([key_delta],
            'unordered', True).next().get_bytes_as('fulltext'))

    def test_iter_lines_added_or_present_in_keys(self):
        # Lines from the basis are returned, and lines for a given key are only
        # returned once. 
        key1 = ('foo1',)
        key2 = ('foo2',)
        # all sources are asked for keys:
        basis, test = self.get_basis_and_test_knit()
        basis.add_lines(key1, (), ["foo"])
        basis.calls = []
        lines = list(test.iter_lines_added_or_present_in_keys([key1]))
        self.assertEqual([("foo\n", key1)], lines)
        self.assertEqual([("iter_lines_added_or_present_in_keys", set([key1]))],
            basis.calls)
        # keys in both are not duplicated:
        test.add_lines(key2, (), ["bar\n"])
        basis.add_lines(key2, (), ["bar\n"])
        basis.calls = []
        lines = list(test.iter_lines_added_or_present_in_keys([key2]))
        self.assertEqual([("bar\n", key2)], lines)
        self.assertEqual([], basis.calls)

    def test_keys(self):
        key1 = ('foo1',)
        key2 = ('foo2',)
        # all sources are asked for keys:
        basis, test = self.get_basis_and_test_knit()
        keys = test.keys()
        self.assertEqual(set(), set(keys))
        self.assertEqual([("keys",)], basis.calls)
        # keys from a basis are returned:
        basis.add_lines(key1, (), [])
        basis.calls = []
        keys = test.keys()
        self.assertEqual(set([key1]), set(keys))
        self.assertEqual([("keys",)], basis.calls)
        # keys in both are not duplicated:
        test.add_lines(key2, (), [])
        basis.add_lines(key2, (), [])
        basis.calls = []
        keys = test.keys()
        self.assertEqual(2, len(keys))
        self.assertEqual(set([key1, key2]), set(keys))
        self.assertEqual([("keys",)], basis.calls)

    def test_add_mpdiffs(self):
        # records are inserted as normal; add_mpdiff builds on
        # add_lines, so a smoke test should be all that's needed:
        key = ('foo',)
        key_basis = ('bar',)
        key_delta = ('zaphod',)
        basis, test = self.get_basis_and_test_knit()
        source = self.make_test_knit(name='source')
        basis.add_lines(key_basis, (), ['foo\n'])
        basis.calls = []
        source.add_lines(key_basis, (), ['foo\n'])
        source.add_lines(key_delta, (key_basis,), ['bar\n'])
        diffs = source.make_mpdiffs([key_delta])
        test.add_mpdiffs([(key_delta, (key_basis,),
            source.get_sha1s([key_delta])[key_delta], diffs[0])])
        self.assertEqual([("get_parent_map", set([key_basis])),
            ('get_record_stream', [key_basis], 'unordered', True),
            ('get_parent_map', set([key_basis]))],
            basis.calls)
        self.assertEqual({key_delta:(key_basis,)},
            test.get_parent_map([key_delta]))
        self.assertEqual('bar\n', test.get_record_stream([key_delta],
            'unordered', True).next().get_bytes_as('fulltext'))

    def test_make_mpdiffs(self):
        # Generating an mpdiff across a stacking boundary should detect parent
        # texts regions.
        key = ('foo',)
        key_left = ('bar',)
        key_right = ('zaphod',)
        basis, test = self.get_basis_and_test_knit()
        basis.add_lines(key_left, (), ['bar\n'])
        basis.add_lines(key_right, (), ['zaphod\n'])
        basis.calls = []
        test.add_lines(key, (key_left, key_right),
            ['bar\n', 'foo\n', 'zaphod\n'])
        diffs = test.make_mpdiffs([key])
        self.assertEqual([
            multiparent.MultiParent([multiparent.ParentText(0, 0, 0, 1),
                multiparent.NewText(['foo\n']),
                multiparent.ParentText(1, 0, 2, 1)])],
            diffs)
        self.assertEqual(4, len(basis.calls))
        self.assertEqual([
            ("get_parent_map", set([key_left, key_right])),
            ("get_parent_map", set([key_left, key_right])),
            ("get_parent_map", set([key_left, key_right])),
            ],
            basis.calls[:3])
        last_call = basis.calls[3]
        self.assertEqual('get_record_stream', last_call[0])
        self.assertEqual(set([key_left, key_right]), set(last_call[1]))
        self.assertEqual('unordered', last_call[2])
        self.assertEqual(True, last_call[3])

2484.1.12 by John Arbash Meinel Switch the layout to use a matching _knit_load_data_py.py and _knit_load_data_c.pyx	1	# Copyright (C) 2005, 2006, 2007 Canonical Ltd
1563.2.4 by Robert Collins First cut at including the knit implementation of versioned_file.	2	#
	3	# This program is free software; you can redistribute it and/or modify
	4	# it under the terms of the GNU General Public License as published by
	5	# the Free Software Foundation; either version 2 of the License, or
	6	# (at your option) any later version.
	7	#
	8	# This program is distributed in the hope that it will be useful,
	9	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	# GNU General Public License for more details.
	12	#
	13	# You should have received a copy of the GNU General Public License
	14	# along with this program; if not, write to the Free Software
	15	# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	16
	17	"""Tests for Knit data structure"""
	18
2158.3.1 by Dmitry Vasiliev KnitIndex tests/fixes/optimizations	19	from cStringIO import StringIO
1563.2.4 by Robert Collins First cut at including the knit implementation of versioned_file.	20	import difflib
2329.1.1 by John Arbash Meinel Update _KnitData parser to raise more helpful errors when it detects corruption.	21	import gzip
2484.1.17 by John Arbash Meinel Workaround for Pyrex <0.9.5 and python >=2.5 incompatibilities.	22	import sys
1563.2.4 by Robert Collins First cut at including the knit implementation of versioned_file.	23
2196.2.5 by John Arbash Meinel Add an exception class when the knit index storage method is unknown, and properly test for it	24	from bzrlib import (
	25	errors,
2484.1.5 by John Arbash Meinel Simplistic implementations of custom parsers for options and parents	26	generate_ids,
2484.1.1 by John Arbash Meinel Add an initial function to read knit indexes in pyrex.	27	knit,
3350.8.12 by Robert Collins Stacked make_mpdiffs.	28	multiparent,
3734.2.4 by Vincent Ladeuil Fix python2.6 deprecation warnings related to hashlib.	29	osutils,
2592.3.66 by Robert Collins Allow adaption of KnitData to pack files.	30	pack,
2196.2.5 by John Arbash Meinel Add an exception class when the knit index storage method is unknown, and properly test for it	31	)
2158.3.1 by Dmitry Vasiliev KnitIndex tests/fixes/optimizations	32	from bzrlib.errors import (
	33	RevisionAlreadyPresent,
	34	KnitHeaderError,
	35	RevisionNotPresent,
	36	NoSuchFile,
	37	)
2592.3.1 by Robert Collins Allow giving KnitVersionedFile an index object to use rather than implicitly creating one.	38	from bzrlib.index import *
1684.3.3 by Robert Collins Add a special cased weaves to knit converter.	39	from bzrlib.knit import (
2794.1.2 by Robert Collins Nuke versioned file add/get delta support, allowing easy simplification of unannotated Content, reducing memory copies and friction during commit on unannotated texts.	40	AnnotatedKnitContent,