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# Copyright (C) 2005, 2006 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Knit versionedfile implementation.
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A knit is a versioned file implementation that supports efficient append only
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lifeless: the data file is made up of "delta records". each delta record has a delta header
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that contains; (1) a version id, (2) the size of the delta (in lines), and (3) the digest of
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the -expanded data- (ie, the delta applied to the parent). the delta also ends with a
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end-marker; simply "end VERSION"
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delta can be line or full contents.a
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... the 8's there are the index number of the annotation.
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version robertc@robertcollins.net-20051003014215-ee2990904cc4c7ad 7 c7d23b2a5bd6ca00e8e266cec0ec228158ee9f9e
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8 e.set('executable', 'yes')
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8 if elt.get('executable') == 'yes':
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8 ie.executable = True
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end robertc@robertcollins.net-20051003014215-ee2990904cc4c7ad
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09:33 < jrydberg> lifeless: each index is made up of a tuple of; version id, options, position, size, parents
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09:33 < jrydberg> lifeless: the parents are currently dictionary compressed
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09:33 < jrydberg> lifeless: (meaning it currently does not support ghosts)
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09:33 < lifeless> right
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09:33 < jrydberg> lifeless: the position and size is the range in the data file
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so the index sequence is the dictionary compressed sequence number used
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in the deltas to provide line annotation
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# 10:16 < lifeless> make partial index writes safe
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# 10:16 < lifeless> implement 'knit.check()' like weave.check()
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# 10:17 < lifeless> record known ghosts so we can detect when they are filled in rather than the current 'reweave
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# move sha1 out of the content so that join is faster at verifying parents
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# record content length ?
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from cStringIO import StringIO
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from itertools import izip, chain
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from bzrlib.errors import (
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RevisionAlreadyPresent,
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from bzrlib.tuned_gzip import GzipFile
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from bzrlib.trace import mutter
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from bzrlib.osutils import (
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from bzrlib.symbol_versioning import DEPRECATED_PARAMETER, deprecated_passed
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from bzrlib.tsort import topo_sort
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from bzrlib.versionedfile import VersionedFile, InterVersionedFile
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# TODO: Split out code specific to this format into an associated object.
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# TODO: Can we put in some kind of value to check that the index and data
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# files belong together?
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# TODO: accommodate binaries, perhaps by storing a byte count
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# TODO: function to check whole file
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# TODO: atomically append data, then measure backwards from the cursor
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# position after writing to work out where it was located. we may need to
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# bypass python file buffering.
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DATA_SUFFIX = '.knit'
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INDEX_SUFFIX = '.kndx'
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class KnitContent(object):
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"""Content of a knit version to which deltas can be applied."""
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def __init__(self, lines):
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def annotate_iter(self):
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"""Yield tuples of (origin, text) for each content line."""
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return iter(self._lines)
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"""Return a list of (origin, text) tuples."""
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return list(self.annotate_iter())
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def line_delta_iter(self, new_lines):
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"""Generate line-based delta from this content to new_lines."""
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new_texts = new_lines.text()
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old_texts = self.text()
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s = KnitSequenceMatcher(None, old_texts, new_texts)
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for tag, i1, i2, j1, j2 in s.get_opcodes():
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# ofrom, oto, length, data
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yield i1, i2, j2 - j1, new_lines._lines[j1:j2]
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def line_delta(self, new_lines):
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return list(self.line_delta_iter(new_lines))
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return [text for origin, text in self._lines]
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return KnitContent(self._lines[:])
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class _KnitFactory(object):
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"""Base factory for creating content objects."""
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def make(self, lines, version_id):
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num_lines = len(lines)
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return KnitContent(zip([version_id] * num_lines, lines))
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class KnitAnnotateFactory(_KnitFactory):
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"""Factory for creating annotated Content objects."""
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def parse_fulltext(self, content, version_id):
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"""Convert fulltext to internal representation
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fulltext content is of the format
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revid(utf8) plaintext\n
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internal representation is of the format:
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# TODO: jam 20070209 The tests expect this to be returned as tuples,
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# but the code itself doesn't really depend on that.
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# Figure out a way to not require the overhead of turning the
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# list back into tuples.
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lines = [tuple(line.split(' ', 1)) for line in content]
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return KnitContent(lines)
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def parse_line_delta_iter(self, lines):
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return iter(self.parse_line_delta(lines))
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def parse_line_delta(self, lines, version_id):
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"""Convert a line based delta into internal representation.
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line delta is in the form of:
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intstart intend intcount
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revid(utf8) newline\n
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internal representation is
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(start, end, count, [1..count tuples (revid, newline)])
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def cache_and_return(line):
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origin, text = line.split(' ', 1)
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return cache.setdefault(origin, origin), text
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# walk through the lines parsing.
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start, end, count = [int(n) for n in header.split(',')]
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contents = [tuple(next().split(' ', 1)) for i in xrange(count)]
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result.append((start, end, count, contents))
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def get_fulltext_content(self, lines):
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"""Extract just the content lines from a fulltext."""
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return (line.split(' ', 1)[1] for line in lines)
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def get_linedelta_content(self, lines):
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"""Extract just the content from a line delta.
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This doesn't return all of the extra information stored in a delta.
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Only the actual content lines.
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header = header.split(',')
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count = int(header[2])
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for i in xrange(count):
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origin, text = next().split(' ', 1)
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def lower_fulltext(self, content):
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"""convert a fulltext content record into a serializable form.
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see parse_fulltext which this inverts.
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# TODO: jam 20070209 We only do the caching thing to make sure that
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# the origin is a valid utf-8 line, eventually we could remove it
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return ['%s %s' % (o, t) for o, t in content._lines]
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def lower_line_delta(self, delta):
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"""convert a delta into a serializable form.
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See parse_line_delta which this inverts.
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# TODO: jam 20070209 We only do the caching thing to make sure that
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# the origin is a valid utf-8 line, eventually we could remove it
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for start, end, c, lines in delta:
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out.append('%d,%d,%d\n' % (start, end, c))
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out.extend(origin + ' ' + text
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for origin, text in lines)
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class KnitPlainFactory(_KnitFactory):
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"""Factory for creating plain Content objects."""
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def parse_fulltext(self, content, version_id):
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"""This parses an unannotated fulltext.
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Note that this is not a noop - the internal representation
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has (versionid, line) - its just a constant versionid.
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return self.make(content, version_id)
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def parse_line_delta_iter(self, lines, version_id):
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num_lines = len(lines)
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while cur < num_lines:
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start, end, c = [int(n) for n in header.split(',')]
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yield start, end, c, zip([version_id] * c, lines[cur:cur+c])
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def parse_line_delta(self, lines, version_id):
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return list(self.parse_line_delta_iter(lines, version_id))
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def get_fulltext_content(self, lines):
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"""Extract just the content lines from a fulltext."""
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def get_linedelta_content(self, lines):
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"""Extract just the content from a line delta.
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This doesn't return all of the extra information stored in a delta.
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Only the actual content lines.
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header = header.split(',')
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count = int(header[2])
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for i in xrange(count):
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def lower_fulltext(self, content):
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return content.text()
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def lower_line_delta(self, delta):
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for start, end, c, lines in delta:
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out.append('%d,%d,%d\n' % (start, end, c))
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out.extend([text for origin, text in lines])
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def make_empty_knit(transport, relpath):
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"""Construct a empty knit at the specified location."""
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k = KnitVersionedFile(transport, relpath, 'w', KnitPlainFactory)
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class KnitVersionedFile(VersionedFile):
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"""Weave-like structure with faster random access.
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A knit stores a number of texts and a summary of the relationships
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between them. Texts are identified by a string version-id. Texts
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are normally stored and retrieved as a series of lines, but can
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also be passed as single strings.
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Lines are stored with the trailing newline (if any) included, to
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avoid special cases for files with no final newline. Lines are
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composed of 8-bit characters, not unicode. The combination of
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these approaches should mean any 'binary' file can be safely
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stored and retrieved.
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def __init__(self, relpath, transport, file_mode=None, access_mode=None,
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factory=None, basis_knit=DEPRECATED_PARAMETER, delta=True,
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create=False, create_parent_dir=False, delay_create=False,
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"""Construct a knit at location specified by relpath.
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:param create: If not True, only open an existing knit.
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:param create_parent_dir: If True, create the parent directory if
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creating the file fails. (This is used for stores with
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hash-prefixes that may not exist yet)
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:param delay_create: The calling code is aware that the knit won't
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actually be created until the first data is stored.
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if deprecated_passed(basis_knit):
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warnings.warn("KnitVersionedFile.__(): The basis_knit parameter is"
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" deprecated as of bzr 0.9.",
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DeprecationWarning, stacklevel=2)
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if access_mode is None:
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super(KnitVersionedFile, self).__init__(access_mode)
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assert access_mode in ('r', 'w'), "invalid mode specified %r" % access_mode
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self.transport = transport
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self.filename = relpath
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self.factory = factory or KnitAnnotateFactory()
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self.writable = (access_mode == 'w')
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self._max_delta_chain = 200
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self._index = _KnitIndex(transport, relpath + INDEX_SUFFIX,
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access_mode, create=create, file_mode=file_mode,
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create_parent_dir=create_parent_dir, delay_create=delay_create,
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self._data = _KnitData(transport, relpath + DATA_SUFFIX,
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access_mode, create=create and not len(self), file_mode=file_mode,
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create_parent_dir=create_parent_dir, delay_create=delay_create,
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return '%s(%s)' % (self.__class__.__name__,
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self.transport.abspath(self.filename))
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def _check_should_delta(self, first_parents):
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"""Iterate back through the parent listing, looking for a fulltext.
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This is used when we want to decide whether to add a delta or a new
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fulltext. It searches for _max_delta_chain parents. When it finds a
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fulltext parent, it sees if the total size of the deltas leading up to
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it is large enough to indicate that we want a new full text anyway.
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Return True if we should create a new delta, False if we should use a
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delta_parents = first_parents
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for count in xrange(self._max_delta_chain):
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parent = delta_parents[0]
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method = self._index.get_method(parent)
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pos, size = self._index.get_position(parent)
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if method == 'fulltext':
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delta_parents = self._index.get_parents(parent)
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# We couldn't find a fulltext, so we must create a new one
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return fulltext_size > delta_size
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def _add_delta(self, version_id, parents, delta_parent, sha1, noeol, delta):
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"""See VersionedFile._add_delta()."""
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self._check_add(version_id, []) # should we check the lines ?
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self._check_versions_present(parents)
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for parent in parents:
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if not self.has_version(parent):
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ghosts.append(parent)
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present_parents.append(parent)
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if delta_parent is None:
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# reconstitute as full text.
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assert len(delta) == 1 or len(delta) == 0
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assert delta[0][0] == 0
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assert delta[0][1] == 0, delta[0][1]
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return super(KnitVersionedFile, self)._add_delta(version_id,
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options.append('no-eol')
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if delta_parent is not None:
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# determine the current delta chain length.
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# To speed the extract of texts the delta chain is limited
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# to a fixed number of deltas. This should minimize both
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# I/O and the time spend applying deltas.
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# The window was changed to a maximum of 200 deltas, but also added
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# was a check that the total compressed size of the deltas is
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# smaller than the compressed size of the fulltext.
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if not self._check_should_delta([delta_parent]):
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# We don't want a delta here, just do a normal insertion.
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return super(KnitVersionedFile, self)._add_delta(version_id,
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options.append('line-delta')
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store_lines = self.factory.lower_line_delta(delta)
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where, size = self._data.add_record(version_id, digest, store_lines)
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self._index.add_version(version_id, options, where, size, parents)
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def _add_raw_records(self, records, data):
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"""Add all the records 'records' with data pre-joined in 'data'.
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:param records: A list of tuples(version_id, options, parents, size).
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:param data: The data for the records. When it is written, the records
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are adjusted to have pos pointing into data by the sum of
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the preceding records sizes.
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pos = self._data.add_raw_record(data)
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for (version_id, options, parents, size) in records:
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index_entries.append((version_id, options, pos+offset,
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if self._data._do_cache:
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self._data._cache[version_id] = data[offset:offset+size]
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self._index.add_versions(index_entries)
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def enable_cache(self):
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"""Start caching data for this knit"""
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self._data.enable_cache()
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def clear_cache(self):
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"""Clear the data cache only."""
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self._data.clear_cache()
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def copy_to(self, name, transport):
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"""See VersionedFile.copy_to()."""
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# copy the current index to a temp index to avoid racing with local
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transport.put_file_non_atomic(name + INDEX_SUFFIX + '.tmp',
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self.transport.get(self._index._filename))
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f = self._data._open_file()
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transport.put_file(name + DATA_SUFFIX, f)
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# move the copied index into place
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transport.move(name + INDEX_SUFFIX + '.tmp', name + INDEX_SUFFIX)
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def create_empty(self, name, transport, mode=None):
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return KnitVersionedFile(name, transport, factory=self.factory,
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delta=self.delta, create=True)
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def _fix_parents(self, version_id, new_parents):
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"""Fix the parents list for version.
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This is done by appending a new version to the index
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with identical data except for the parents list.
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the parents list must be a superset of the current
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current_values = self._index._cache[version_id]
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assert set(current_values[4]).difference(set(new_parents)) == set()
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self._index.add_version(version_id,
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def get_delta(self, version_id):
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"""Get a delta for constructing version from some other version."""
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version_id = osutils.safe_revision_id(version_id)
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self.check_not_reserved_id(version_id)
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if not self.has_version(version_id):
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raise RevisionNotPresent(version_id, self.filename)
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parents = self.get_parents(version_id)
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data_pos, data_size = self._index.get_position(version_id)
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data, sha1 = self._data.read_records(((version_id, data_pos, data_size),))[version_id]
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noeol = 'no-eol' in self._index.get_options(version_id)
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if 'fulltext' == self._index.get_method(version_id):
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new_content = self.factory.parse_fulltext(data, version_id)
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if parent is not None:
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reference_content = self._get_content(parent)
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old_texts = reference_content.text()
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new_texts = new_content.text()
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delta_seq = KnitSequenceMatcher(None, old_texts, new_texts)
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return parent, sha1, noeol, self._make_line_delta(delta_seq, new_content)
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delta = self.factory.parse_line_delta(data, version_id)
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return parent, sha1, noeol, delta
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def get_graph_with_ghosts(self):
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"""See VersionedFile.get_graph_with_ghosts()."""
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graph_items = self._index.get_graph()
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return dict(graph_items)
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def get_sha1(self, version_id):
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"""See VersionedFile.get_sha1()."""
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version_id = osutils.safe_revision_id(version_id)
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record_map = self._get_record_map([version_id])
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method, content, digest, next = record_map[version_id]
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"""See VersionedFile.get_suffixes()."""
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return [DATA_SUFFIX, INDEX_SUFFIX]
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def has_ghost(self, version_id):
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"""True if there is a ghost reference in the file to version_id."""
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version_id = osutils.safe_revision_id(version_id)
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if self.has_version(version_id):
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# optimisable if needed by memoising the _ghosts set.
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items = self._index.get_graph()
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for node, parents in items:
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for parent in parents:
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if parent not in self._index._cache:
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if parent == version_id:
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"""See VersionedFile.versions."""
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return self._index.get_versions()
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def has_version(self, version_id):
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"""See VersionedFile.has_version."""
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version_id = osutils.safe_revision_id(version_id)
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return self._index.has_version(version_id)
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__contains__ = has_version
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def _merge_annotations(self, content, parents, parent_texts={},
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delta=None, annotated=None):
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"""Merge annotations for content. This is done by comparing
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the annotations based on changed to the text.
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for parent_id in parents:
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merge_content = self._get_content(parent_id, parent_texts)
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seq = patiencediff.PatienceSequenceMatcher(
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None, merge_content.text(), content.text())
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if delta_seq is None:
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# setup a delta seq to reuse.
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for i, j, n in seq.get_matching_blocks():
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# this appears to copy (origin, text) pairs across to the new
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# content for any line that matches the last-checked parent.
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# FIXME: save the sequence control data for delta compression
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# against the most relevant parent rather than rediffing.
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content._lines[j:j+n] = merge_content._lines[i:i+n]
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reference_content = self._get_content(parents[0], parent_texts)
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new_texts = content.text()
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old_texts = reference_content.text()
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delta_seq = patiencediff.PatienceSequenceMatcher(
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None, old_texts, new_texts)
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return self._make_line_delta(delta_seq, content)
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def _make_line_delta(self, delta_seq, new_content):
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"""Generate a line delta from delta_seq and new_content."""
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for op in delta_seq.get_opcodes():
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diff_hunks.append((op[1], op[2], op[4]-op[3], new_content._lines[op[3]:op[4]]))
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def _get_components_positions(self, version_ids):
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"""Produce a map of position data for the components of versions.
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This data is intended to be used for retrieving the knit records.
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A dict of version_id to (method, data_pos, data_size, next) is
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method is the way referenced data should be applied.
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data_pos is the position of the data in the knit.
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data_size is the size of the data in the knit.
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next is the build-parent of the version, or None for fulltexts.
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for version_id in version_ids:
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while cursor is not None and cursor not in component_data:
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method = self._index.get_method(cursor)
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if method == 'fulltext':
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next = self.get_parents(cursor)[0]
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data_pos, data_size = self._index.get_position(cursor)
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component_data[cursor] = (method, data_pos, data_size, next)
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return component_data
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def _get_content(self, version_id, parent_texts={}):
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"""Returns a content object that makes up the specified
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if not self.has_version(version_id):
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raise RevisionNotPresent(version_id, self.filename)
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cached_version = parent_texts.get(version_id, None)
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if cached_version is not None:
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return cached_version
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text_map, contents_map = self._get_content_maps([version_id])
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return contents_map[version_id]
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def _check_versions_present(self, version_ids):
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"""Check that all specified versions are present."""
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self._index.check_versions_present(version_ids)
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def _add_lines_with_ghosts(self, version_id, parents, lines, parent_texts):
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"""See VersionedFile.add_lines_with_ghosts()."""
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self._check_add(version_id, lines)
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return self._add(version_id, lines[:], parents, self.delta, parent_texts)
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def _add_lines(self, version_id, parents, lines, parent_texts):
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"""See VersionedFile.add_lines."""
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self._check_add(version_id, lines)
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self._check_versions_present(parents)
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return self._add(version_id, lines[:], parents, self.delta, parent_texts)
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def _check_add(self, version_id, lines):
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"""check that version_id and lines are safe to add."""
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assert self.writable, "knit is not opened for write"
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### FIXME escape. RBC 20060228
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if contains_whitespace(version_id):
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raise InvalidRevisionId(version_id, self.filename)
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self.check_not_reserved_id(version_id)
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if self.has_version(version_id):
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raise RevisionAlreadyPresent(version_id, self.filename)
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self._check_lines_not_unicode(lines)
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self._check_lines_are_lines(lines)
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def _add(self, version_id, lines, parents, delta, parent_texts):
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"""Add a set of lines on top of version specified by parents.
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If delta is true, compress the text as a line-delta against
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Any versions not present will be converted into ghosts.
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# 461 0 6546.0390 43.9100 bzrlib.knit:489(_add)
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# +400 0 889.4890 418.9790 +bzrlib.knit:192(lower_fulltext)
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# +461 0 1364.8070 108.8030 +bzrlib.knit:996(add_record)
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# +461 0 193.3940 41.5720 +bzrlib.knit:898(add_version)
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# +461 0 134.0590 18.3810 +bzrlib.osutils:361(sha_strings)
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# +461 0 36.3420 15.4540 +bzrlib.knit:146(make)
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# +1383 0 8.0370 8.0370 +<len>
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# +61 0 13.5770 7.9190 +bzrlib.knit:199(lower_line_delta)
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# +61 0 963.3470 7.8740 +bzrlib.knit:427(_get_content)
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# +61 0 973.9950 5.2950 +bzrlib.knit:136(line_delta)
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# +61 0 1918.1800 5.2640 +bzrlib.knit:359(_merge_annotations)
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if parent_texts is None:
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for parent in parents:
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if not self.has_version(parent):
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ghosts.append(parent)
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present_parents.append(parent)
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if delta and not len(present_parents):
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digest = sha_strings(lines)
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if lines[-1][-1] != '\n':
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options.append('no-eol')
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lines[-1] = lines[-1] + '\n'
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if len(present_parents) and delta:
742
# To speed the extract of texts the delta chain is limited
743
# to a fixed number of deltas. This should minimize both
744
# I/O and the time spend applying deltas.
745
delta = self._check_should_delta(present_parents)
747
assert isinstance(version_id, str)
748
lines = self.factory.make(lines, version_id)
749
if delta or (self.factory.annotated and len(present_parents) > 0):
750
# Merge annotations from parent texts if so is needed.
751
delta_hunks = self._merge_annotations(lines, present_parents, parent_texts,
752
delta, self.factory.annotated)
755
options.append('line-delta')
756
store_lines = self.factory.lower_line_delta(delta_hunks)
758
options.append('fulltext')
759
store_lines = self.factory.lower_fulltext(lines)
761
where, size = self._data.add_record(version_id, digest, store_lines)
762
self._index.add_version(version_id, options, where, size, parents)
765
def check(self, progress_bar=None):
766
"""See VersionedFile.check()."""
768
def _clone_text(self, new_version_id, old_version_id, parents):
769
"""See VersionedFile.clone_text()."""
770
# FIXME RBC 20060228 make fast by only inserting an index with null
772
self.add_lines(new_version_id, parents, self.get_lines(old_version_id))
774
def get_lines(self, version_id):
775
"""See VersionedFile.get_lines()."""
776
return self.get_line_list([version_id])[0]
778
def _get_record_map(self, version_ids):
779
"""Produce a dictionary of knit records.
781
The keys are version_ids, the values are tuples of (method, content,
783
method is the way the content should be applied.
784
content is a KnitContent object.
785
digest is the SHA1 digest of this version id after all steps are done
786
next is the build-parent of the version, i.e. the leftmost ancestor.
787
If the method is fulltext, next will be None.
789
position_map = self._get_components_positions(version_ids)
790
# c = component_id, m = method, p = position, s = size, n = next
791
records = [(c, p, s) for c, (m, p, s, n) in position_map.iteritems()]
793
for component_id, content, digest in \
794
self._data.read_records_iter(records):
795
method, position, size, next = position_map[component_id]
796
record_map[component_id] = method, content, digest, next
800
def get_text(self, version_id):
801
"""See VersionedFile.get_text"""
802
return self.get_texts([version_id])[0]
804
def get_texts(self, version_ids):
805
return [''.join(l) for l in self.get_line_list(version_ids)]
807
def get_line_list(self, version_ids):
808
"""Return the texts of listed versions as a list of strings."""
809
version_ids = [osutils.safe_revision_id(v) for v in version_ids]
810
for version_id in version_ids:
811
self.check_not_reserved_id(version_id)
812
text_map, content_map = self._get_content_maps(version_ids)
813
return [text_map[v] for v in version_ids]
815
def _get_content_maps(self, version_ids):
816
"""Produce maps of text and KnitContents
818
:return: (text_map, content_map) where text_map contains the texts for
819
the requested versions and content_map contains the KnitContents.
820
Both dicts take version_ids as their keys.
822
for version_id in version_ids:
823
if not self.has_version(version_id):
824
raise RevisionNotPresent(version_id, self.filename)
825
record_map = self._get_record_map(version_ids)
830
for version_id in version_ids:
833
while cursor is not None:
834
method, data, digest, next = record_map[cursor]
835
components.append((cursor, method, data, digest))
836
if cursor in content_map:
841
for component_id, method, data, digest in reversed(components):
842
if component_id in content_map:
843
content = content_map[component_id]
845
if method == 'fulltext':
846
assert content is None
847
content = self.factory.parse_fulltext(data, version_id)
848
elif method == 'line-delta':
849
delta = self.factory.parse_line_delta(data, version_id)
850
content = content.copy()
851
content._lines = self._apply_delta(content._lines,
853
content_map[component_id] = content
855
if 'no-eol' in self._index.get_options(version_id):
856
content = content.copy()
857
line = content._lines[-1][1].rstrip('\n')
858
content._lines[-1] = (content._lines[-1][0], line)
859
final_content[version_id] = content
861
# digest here is the digest from the last applied component.
862
text = content.text()
863
if sha_strings(text) != digest:
864
raise KnitCorrupt(self.filename,
865
'sha-1 does not match %s' % version_id)
867
text_map[version_id] = text
868
return text_map, final_content
870
def iter_lines_added_or_present_in_versions(self, version_ids=None,
872
"""See VersionedFile.iter_lines_added_or_present_in_versions()."""
873
if version_ids is None:
874
version_ids = self.versions()
876
version_ids = [osutils.safe_revision_id(v) for v in version_ids]
878
pb = progress.DummyProgress()
879
# we don't care about inclusions, the caller cares.
880
# but we need to setup a list of records to visit.
881
# we need version_id, position, length
882
version_id_records = []
883
requested_versions = set(version_ids)
884
# filter for available versions
885
for version_id in requested_versions:
886
if not self.has_version(version_id):
887
raise RevisionNotPresent(version_id, self.filename)
888
# get a in-component-order queue:
889
for version_id in self.versions():
890
if version_id in requested_versions:
891
data_pos, length = self._index.get_position(version_id)
892
version_id_records.append((version_id, data_pos, length))
894
total = len(version_id_records)
895
for version_idx, (version_id, data, sha_value) in \
896
enumerate(self._data.read_records_iter(version_id_records)):
897
pb.update('Walking content.', version_idx, total)
898
method = self._index.get_method(version_id)
900
assert method in ('fulltext', 'line-delta')
901
if method == 'fulltext':
902
line_iterator = self.factory.get_fulltext_content(data)
904
line_iterator = self.factory.get_linedelta_content(data)
905
for line in line_iterator:
908
pb.update('Walking content.', total, total)
910
def num_versions(self):
911
"""See VersionedFile.num_versions()."""
912
return self._index.num_versions()
914
__len__ = num_versions
916
def annotate_iter(self, version_id):
917
"""See VersionedFile.annotate_iter."""
918
version_id = osutils.safe_revision_id(version_id)
919
content = self._get_content(version_id)
920
for origin, text in content.annotate_iter():
923
def get_parents(self, version_id):
924
"""See VersionedFile.get_parents."""
927
# 52554 calls in 1264 872 internal down from 3674
928
version_id = osutils.safe_revision_id(version_id)
930
return self._index.get_parents(version_id)
932
raise RevisionNotPresent(version_id, self.filename)
934
def get_parents_with_ghosts(self, version_id):
935
"""See VersionedFile.get_parents."""
936
version_id = osutils.safe_revision_id(version_id)
938
return self._index.get_parents_with_ghosts(version_id)
940
raise RevisionNotPresent(version_id, self.filename)
942
def get_ancestry(self, versions):
943
"""See VersionedFile.get_ancestry."""
944
if isinstance(versions, basestring):
945
versions = [versions]
948
versions = [osutils.safe_revision_id(v) for v in versions]
949
return self._index.get_ancestry(versions)
951
def get_ancestry_with_ghosts(self, versions):
952
"""See VersionedFile.get_ancestry_with_ghosts."""
953
if isinstance(versions, basestring):
954
versions = [versions]
957
versions = [osutils.safe_revision_id(v) for v in versions]
958
return self._index.get_ancestry_with_ghosts(versions)
960
#@deprecated_method(zero_eight)
961
def walk(self, version_ids):
962
"""See VersionedFile.walk."""
963
# We take the short path here, and extract all relevant texts
964
# and put them in a weave and let that do all the work. Far
965
# from optimal, but is much simpler.
966
# FIXME RB 20060228 this really is inefficient!
967
from bzrlib.weave import Weave
969
w = Weave(self.filename)
970
ancestry = self.get_ancestry(version_ids)
971
sorted_graph = topo_sort(self._index.get_graph())
972
version_list = [vid for vid in sorted_graph if vid in ancestry]
974
for version_id in version_list:
975
lines = self.get_lines(version_id)
976
w.add_lines(version_id, self.get_parents(version_id), lines)
978
for lineno, insert_id, dset, line in w.walk(version_ids):
979
yield lineno, insert_id, dset, line
981
def plan_merge(self, ver_a, ver_b):
982
"""See VersionedFile.plan_merge."""
983
ver_a = osutils.safe_revision_id(ver_a)
984
ver_b = osutils.safe_revision_id(ver_b)
985
ancestors_b = set(self.get_ancestry(ver_b))
986
def status_a(revision, text):
987
if revision in ancestors_b:
988
return 'killed-b', text
992
ancestors_a = set(self.get_ancestry(ver_a))
993
def status_b(revision, text):
994
if revision in ancestors_a:
995
return 'killed-a', text
999
annotated_a = self.annotate(ver_a)
1000
annotated_b = self.annotate(ver_b)
1001
plain_a = [t for (a, t) in annotated_a]
1002
plain_b = [t for (a, t) in annotated_b]
1003
blocks = KnitSequenceMatcher(None, plain_a, plain_b).get_matching_blocks()
1006
for ai, bi, l in blocks:
1007
# process all mismatched sections
1008
# (last mismatched section is handled because blocks always
1009
# includes a 0-length last block)
1010
for revision, text in annotated_a[a_cur:ai]:
1011
yield status_a(revision, text)
1012
for revision, text in annotated_b[b_cur:bi]:
1013
yield status_b(revision, text)
1015
# and now the matched section
1018
for text_a, text_b in zip(plain_a[ai:a_cur], plain_b[bi:b_cur]):
1019
assert text_a == text_b
1020
yield "unchanged", text_a
1023
class _KnitComponentFile(object):
1024
"""One of the files used to implement a knit database"""
1026
def __init__(self, transport, filename, mode, file_mode=None,
1027
create_parent_dir=False, dir_mode=None):
1028
self._transport = transport
1029
self._filename = filename
1031
self._file_mode = file_mode
1032
self._dir_mode = dir_mode
1033
self._create_parent_dir = create_parent_dir
1034
self._need_to_create = False
1036
def _full_path(self):
1037
"""Return the full path to this file."""
1038
return self._transport.base + self._filename
1040
def check_header(self, fp):
1041
line = fp.readline()
1043
# An empty file can actually be treated as though the file doesn't
1045
raise errors.NoSuchFile(self._full_path())
1046
if line != self.HEADER:
1047
raise KnitHeaderError(badline=line,
1048
filename=self._transport.abspath(self._filename))
1051
"""Commit is a nop."""
1054
return '%s(%s)' % (self.__class__.__name__, self._filename)
1057
class _KnitIndex(_KnitComponentFile):
1058
"""Manages knit index file.
1060
The index is already kept in memory and read on startup, to enable
1061
fast lookups of revision information. The cursor of the index
1062
file is always pointing to the end, making it easy to append
1065
_cache is a cache for fast mapping from version id to a Index
1068
_history is a cache for fast mapping from indexes to version ids.
1070
The index data format is dictionary compressed when it comes to
1071
parent references; a index entry may only have parents that with a
1072
lover index number. As a result, the index is topological sorted.
1074
Duplicate entries may be written to the index for a single version id
1075
if this is done then the latter one completely replaces the former:
1076
this allows updates to correct version and parent information.
1077
Note that the two entries may share the delta, and that successive
1078
annotations and references MUST point to the first entry.
1080
The index file on disc contains a header, followed by one line per knit
1081
record. The same revision can be present in an index file more than once.
1082
The first occurrence gets assigned a sequence number starting from 0.
1084
The format of a single line is
1085
REVISION_ID FLAGS BYTE_OFFSET LENGTH( PARENT_ID|PARENT_SEQUENCE_ID)* :\n
1086
REVISION_ID is a utf8-encoded revision id
1087
FLAGS is a comma separated list of flags about the record. Values include
1088
no-eol, line-delta, fulltext.
1089
BYTE_OFFSET is the ascii representation of the byte offset in the data file
1090
that the the compressed data starts at.
1091
LENGTH is the ascii representation of the length of the data file.
1092
PARENT_ID a utf-8 revision id prefixed by a '.' that is a parent of
1094
PARENT_SEQUENCE_ID the ascii representation of the sequence number of a
1095
revision id already in the knit that is a parent of REVISION_ID.
1096
The ' :' marker is the end of record marker.
1099
when a write is interrupted to the index file, it will result in a line
1100
that does not end in ' :'. If the ' :' is not present at the end of a line,
1101
or at the end of the file, then the record that is missing it will be
1102
ignored by the parser.
1104
When writing new records to the index file, the data is preceded by '\n'
1105
to ensure that records always start on new lines even if the last write was
1106
interrupted. As a result its normal for the last line in the index to be
1107
missing a trailing newline. One can be added with no harmful effects.
1110
HEADER = "# bzr knit index 8\n"
1112
# speed of knit parsing went from 280 ms to 280 ms with slots addition.
1113
# __slots__ = ['_cache', '_history', '_transport', '_filename']
1115
def _cache_version(self, version_id, options, pos, size, parents):
1116
"""Cache a version record in the history array and index cache.
1118
This is inlined into _load_data for performance. KEEP IN SYNC.
1119
(It saves 60ms, 25% of the __init__ overhead on local 4000 record
1122
# only want the _history index to reference the 1st index entry
1124
if version_id not in self._cache:
1125
index = len(self._history)
1126
self._history.append(version_id)
1128
index = self._cache[version_id][5]
1129
self._cache[version_id] = (version_id,
1136
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1137
create_parent_dir=False, delay_create=False, dir_mode=None):
1138
_KnitComponentFile.__init__(self, transport, filename, mode,
1139
file_mode=file_mode,
1140
create_parent_dir=create_parent_dir,
1143
# position in _history is the 'official' index for a revision
1144
# but the values may have come from a newer entry.
1145
# so - wc -l of a knit index is != the number of unique names
1149
fp = self._transport.get(self._filename)
1151
# _load_data may raise NoSuchFile if the target knit is
1157
if mode != 'w' or not create:
1160
self._need_to_create = True
1162
self._transport.put_bytes_non_atomic(
1163
self._filename, self.HEADER, mode=self._file_mode)
1165
def _load_data(self, fp):
1167
history = self._history
1169
self.check_header(fp)
1170
# readlines reads the whole file at once:
1171
# bad for transports like http, good for local disk
1172
# we save 60 ms doing this one change (
1173
# from calling readline each time to calling
1175
# probably what we want for nice behaviour on
1176
# http is a incremental readlines that yields, or
1177
# a check for local vs non local indexes,
1178
history_top = len(history) - 1
1179
for line in fp.readlines():
1181
if len(rec) < 5 or rec[-1] != ':':
1183
# FIXME: in the future we should determine if its a
1184
# short write - and ignore it
1185
# or a different failure, and raise. RBC 20060407
1189
for value in rec[4:-1]:
1191
# uncompressed reference
1192
parent_id = value[1:]
1194
parent_id = history[int(value)]
1195
parents.append(parent_id)
1197
version_id, options, pos, size = rec[:4]
1198
version_id = version_id
1200
# See self._cache_version
1201
# only want the _history index to reference the 1st
1202
# index entry for version_id
1203
if version_id not in cache:
1206
history.append(version_id)
1208
index = cache[version_id][5]
1209
cache[version_id] = (version_id,
1215
# end self._cache_version
1217
def get_graph(self):
1218
return [(vid, idx[4]) for vid, idx in self._cache.iteritems()]
1220
def get_ancestry(self, versions):
1221
"""See VersionedFile.get_ancestry."""
1222
# get a graph of all the mentioned versions:
1224
pending = set(versions)
1227
version = pending.pop()
1230
parents = [p for p in cache[version][4] if p in cache]
1232
raise RevisionNotPresent(version, self._filename)
1233
# if not completed and not a ghost
1234
pending.update([p for p in parents if p not in graph])
1235
graph[version] = parents
1236
return topo_sort(graph.items())
1238
def get_ancestry_with_ghosts(self, versions):
1239
"""See VersionedFile.get_ancestry_with_ghosts."""
1240
# get a graph of all the mentioned versions:
1241
self.check_versions_present(versions)
1244
pending = set(versions)
1246
version = pending.pop()
1248
parents = cache[version][4]
1254
pending.update([p for p in parents if p not in graph])
1255
graph[version] = parents
1256
return topo_sort(graph.items())
1258
def num_versions(self):
1259
return len(self._history)
1261
__len__ = num_versions
1263
def get_versions(self):
1264
return self._history
1266
def idx_to_name(self, idx):
1267
return self._history[idx]
1269
def lookup(self, version_id):
1270
assert version_id in self._cache
1271
return self._cache[version_id][5]
1273
def _version_list_to_index(self, versions):
1276
for version in versions:
1277
if version in cache:
1278
# -- inlined lookup() --
1279
result_list.append(str(cache[version][5]))
1280
# -- end lookup () --
1282
result_list.append('.' + version)
1283
return ' '.join(result_list)
1285
def add_version(self, version_id, options, pos, size, parents):
1286
"""Add a version record to the index."""
1287
self.add_versions(((version_id, options, pos, size, parents),))
1289
def add_versions(self, versions):
1290
"""Add multiple versions to the index.
1292
:param versions: a list of tuples:
1293
(version_id, options, pos, size, parents).
1296
orig_history = self._history[:]
1297
orig_cache = self._cache.copy()
1300
for version_id, options, pos, size, parents in versions:
1301
line = "\n%s %s %s %s %s :" % (version_id,
1305
self._version_list_to_index(parents))
1306
assert isinstance(line, str), \
1307
'content must be utf-8 encoded: %r' % (line,)
1309
self._cache_version(version_id, options, pos, size, parents)
1310
if not self._need_to_create:
1311
self._transport.append_bytes(self._filename, ''.join(lines))
1314
sio.write(self.HEADER)
1315
sio.writelines(lines)
1317
self._transport.put_file_non_atomic(self._filename, sio,
1318
create_parent_dir=self._create_parent_dir,
1319
mode=self._file_mode,
1320
dir_mode=self._dir_mode)
1321
self._need_to_create = False
1323
# If any problems happen, restore the original values and re-raise
1324
self._history = orig_history
1325
self._cache = orig_cache
1328
def has_version(self, version_id):
1329
"""True if the version is in the index."""
1330
return version_id in self._cache
1332
def get_position(self, version_id):
1333
"""Return data position and size of specified version."""
1334
entry = self._cache[version_id]
1335
return entry[2], entry[3]
1337
def get_method(self, version_id):
1338
"""Return compression method of specified version."""
1339
options = self._cache[version_id][1]
1340
if 'fulltext' in options:
1343
if 'line-delta' not in options:
1344
raise errors.KnitIndexUnknownMethod(self._full_path(), options)
1347
def get_options(self, version_id):
1348
return self._cache[version_id][1]
1350
def get_parents(self, version_id):
1351
"""Return parents of specified version ignoring ghosts."""
1352
return [parent for parent in self._cache[version_id][4]
1353
if parent in self._cache]
1355
def get_parents_with_ghosts(self, version_id):
1356
"""Return parents of specified version with ghosts."""
1357
return self._cache[version_id][4]
1359
def check_versions_present(self, version_ids):
1360
"""Check that all specified versions are present."""
1362
for version_id in version_ids:
1363
if version_id not in cache:
1364
raise RevisionNotPresent(version_id, self._filename)
1367
class _KnitData(_KnitComponentFile):
1368
"""Contents of the knit data file"""
1370
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1371
create_parent_dir=False, delay_create=False,
1373
_KnitComponentFile.__init__(self, transport, filename, mode,
1374
file_mode=file_mode,
1375
create_parent_dir=create_parent_dir,
1377
self._checked = False
1378
# TODO: jam 20060713 conceptually, this could spill to disk
1379
# if the cached size gets larger than a certain amount
1380
# but it complicates the model a bit, so for now just use
1381
# a simple dictionary
1383
self._do_cache = False
1386
self._need_to_create = create
1388
self._transport.put_bytes_non_atomic(self._filename, '',
1389
mode=self._file_mode)
1391
def enable_cache(self):
1392
"""Enable caching of reads."""
1393
self._do_cache = True
1395
def clear_cache(self):
1396
"""Clear the record cache."""
1397
self._do_cache = False
1400
def _open_file(self):
1402
return self._transport.get(self._filename)
1407
def _record_to_data(self, version_id, digest, lines):
1408
"""Convert version_id, digest, lines into a raw data block.
1410
:return: (len, a StringIO instance with the raw data ready to read.)
1413
data_file = GzipFile(None, mode='wb', fileobj=sio)
1415
assert isinstance(version_id, str)
1416
data_file.writelines(chain(
1417
["version %s %d %s\n" % (version_id,
1421
["end %s\n" % version_id]))
1428
def add_raw_record(self, raw_data):
1429
"""Append a prepared record to the data file.
1431
:return: the offset in the data file raw_data was written.
1433
assert isinstance(raw_data, str), 'data must be plain bytes'
1434
if not self._need_to_create:
1435
return self._transport.append_bytes(self._filename, raw_data)
1437
self._transport.put_bytes_non_atomic(self._filename, raw_data,
1438
create_parent_dir=self._create_parent_dir,
1439
mode=self._file_mode,
1440
dir_mode=self._dir_mode)
1441
self._need_to_create = False
1444
def add_record(self, version_id, digest, lines):
1445
"""Write new text record to disk. Returns the position in the
1446
file where it was written."""
1447
size, sio = self._record_to_data(version_id, digest, lines)
1449
if not self._need_to_create:
1450
start_pos = self._transport.append_file(self._filename, sio)
1452
self._transport.put_file_non_atomic(self._filename, sio,
1453
create_parent_dir=self._create_parent_dir,
1454
mode=self._file_mode,
1455
dir_mode=self._dir_mode)
1456
self._need_to_create = False
1459
self._cache[version_id] = sio.getvalue()
1460
return start_pos, size
1462
def _parse_record_header(self, version_id, raw_data):
1463
"""Parse a record header for consistency.
1465
:return: the header and the decompressor stream.
1466
as (stream, header_record)
1468
df = GzipFile(mode='rb', fileobj=StringIO(raw_data))
1470
rec = self._check_header(version_id, df.readline())
1471
except Exception, e:
1472
raise KnitCorrupt(self._filename,
1473
"While reading {%s} got %s(%s)"
1474
% (version_id, e.__class__.__name__, str(e)))
1477
def _check_header(self, version_id, line):
1480
raise KnitCorrupt(self._filename,
1481
'unexpected number of elements in record header')
1482
if rec[1] != version_id:
1483
raise KnitCorrupt(self._filename,
1484
'unexpected version, wanted %r, got %r'
1485
% (version_id, rec[1]))
1488
def _parse_record(self, version_id, data):
1490
# 4168 calls in 2880 217 internal
1491
# 4168 calls to _parse_record_header in 2121
1492
# 4168 calls to readlines in 330
1493
df = GzipFile(mode='rb', fileobj=StringIO(data))
1496
record_contents = df.readlines()
1497
except Exception, e:
1498
raise KnitCorrupt(self._filename,
1499
"While reading {%s} got %s(%s)"
1500
% (version_id, e.__class__.__name__, str(e)))
1501
header = record_contents.pop(0)
1502
rec = self._check_header(version_id, header)
1504
last_line = record_contents.pop()
1505
if len(record_contents) != int(rec[2]):
1506
raise KnitCorrupt(self._filename,
1507
'incorrect number of lines %s != %s'
1509
% (len(record_contents), int(rec[2]),
1511
if last_line != 'end %s\n' % rec[1]:
1512
raise KnitCorrupt(self._filename,
1513
'unexpected version end line %r, wanted %r'
1514
% (last_line, version_id))
1516
return record_contents, rec[3]
1518
def read_records_iter_raw(self, records):
1519
"""Read text records from data file and yield raw data.
1521
This unpacks enough of the text record to validate the id is
1522
as expected but thats all.
1524
# setup an iterator of the external records:
1525
# uses readv so nice and fast we hope.
1527
# grab the disk data needed.
1529
# Don't check _cache if it is empty
1530
needed_offsets = [(pos, size) for version_id, pos, size
1532
if version_id not in self._cache]
1534
needed_offsets = [(pos, size) for version_id, pos, size
1537
raw_records = self._transport.readv(self._filename, needed_offsets)
1539
for version_id, pos, size in records:
1540
if version_id in self._cache:
1541
# This data has already been validated
1542
data = self._cache[version_id]
1544
pos, data = raw_records.next()
1546
self._cache[version_id] = data
1548
# validate the header
1549
df, rec = self._parse_record_header(version_id, data)
1551
yield version_id, data
1553
def read_records_iter(self, records):
1554
"""Read text records from data file and yield result.
1556
The result will be returned in whatever is the fastest to read.
1557
Not by the order requested. Also, multiple requests for the same
1558
record will only yield 1 response.
1559
:param records: A list of (version_id, pos, len) entries
1560
:return: Yields (version_id, contents, digest) in the order
1561
read, not the order requested
1567
# Skip records we have alread seen
1568
yielded_records = set()
1569
needed_records = set()
1570
for record in records:
1571
if record[0] in self._cache:
1572
if record[0] in yielded_records:
1574
yielded_records.add(record[0])
1575
data = self._cache[record[0]]
1576
content, digest = self._parse_record(record[0], data)
1577
yield (record[0], content, digest)
1579
needed_records.add(record)
1580
needed_records = sorted(needed_records, key=operator.itemgetter(1))
1582
needed_records = sorted(set(records), key=operator.itemgetter(1))
1584
if not needed_records:
1587
# The transport optimizes the fetching as well
1588
# (ie, reads continuous ranges.)
1589
readv_response = self._transport.readv(self._filename,
1590
[(pos, size) for version_id, pos, size in needed_records])
1592
for (version_id, pos, size), (pos, data) in \
1593
izip(iter(needed_records), readv_response):
1594
content, digest = self._parse_record(version_id, data)
1596
self._cache[version_id] = data
1597
yield version_id, content, digest
1599
def read_records(self, records):
1600
"""Read records into a dictionary."""
1602
for record_id, content, digest in \
1603
self.read_records_iter(records):
1604
components[record_id] = (content, digest)
1608
class InterKnit(InterVersionedFile):
1609
"""Optimised code paths for knit to knit operations."""
1611
_matching_file_from_factory = KnitVersionedFile
1612
_matching_file_to_factory = KnitVersionedFile
1615
def is_compatible(source, target):
1616
"""Be compatible with knits. """
1618
return (isinstance(source, KnitVersionedFile) and
1619
isinstance(target, KnitVersionedFile))
1620
except AttributeError:
1623
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1624
"""See InterVersionedFile.join."""
1625
assert isinstance(self.source, KnitVersionedFile)
1626
assert isinstance(self.target, KnitVersionedFile)
1628
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1633
pb = ui.ui_factory.nested_progress_bar()
1635
version_ids = list(version_ids)
1636
if None in version_ids:
1637
version_ids.remove(None)
1639
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1640
this_versions = set(self.target._index.get_versions())
1641
needed_versions = self.source_ancestry - this_versions
1642
cross_check_versions = self.source_ancestry.intersection(this_versions)
1643
mismatched_versions = set()
1644
for version in cross_check_versions:
1645
# scan to include needed parents.
1646
n1 = set(self.target.get_parents_with_ghosts(version))
1647
n2 = set(self.source.get_parents_with_ghosts(version))
1649
# FIXME TEST this check for cycles being introduced works
1650
# the logic is we have a cycle if in our graph we are an
1651
# ancestor of any of the n2 revisions.
1657
parent_ancestors = self.source.get_ancestry(parent)
1658
if version in parent_ancestors:
1659
raise errors.GraphCycleError([parent, version])
1660
# ensure this parent will be available later.
1661
new_parents = n2.difference(n1)
1662
needed_versions.update(new_parents.difference(this_versions))
1663
mismatched_versions.add(version)
1665
if not needed_versions and not mismatched_versions:
1667
full_list = topo_sort(self.source.get_graph())
1669
version_list = [i for i in full_list if (not self.target.has_version(i)
1670
and i in needed_versions)]
1674
copy_queue_records = []
1676
for version_id in version_list:
1677
options = self.source._index.get_options(version_id)
1678
parents = self.source._index.get_parents_with_ghosts(version_id)
1679
# check that its will be a consistent copy:
1680
for parent in parents:
1681
# if source has the parent, we must :
1682
# * already have it or
1683
# * have it scheduled already
1684
# otherwise we don't care
1685
assert (self.target.has_version(parent) or
1686
parent in copy_set or
1687
not self.source.has_version(parent))
1688
data_pos, data_size = self.source._index.get_position(version_id)
1689
copy_queue_records.append((version_id, data_pos, data_size))
1690
copy_queue.append((version_id, options, parents))
1691
copy_set.add(version_id)
1693
# data suck the join:
1695
total = len(version_list)
1698
for (version_id, raw_data), \
1699
(version_id2, options, parents) in \
1700
izip(self.source._data.read_records_iter_raw(copy_queue_records),
1702
assert version_id == version_id2, 'logic error, inconsistent results'
1704
pb.update("Joining knit", count, total)
1705
raw_records.append((version_id, options, parents, len(raw_data)))
1706
raw_datum.append(raw_data)
1707
self.target._add_raw_records(raw_records, ''.join(raw_datum))
1709
for version in mismatched_versions:
1710
# FIXME RBC 20060309 is this needed?
1711
n1 = set(self.target.get_parents_with_ghosts(version))
1712
n2 = set(self.source.get_parents_with_ghosts(version))
1713
# write a combined record to our history preserving the current
1714
# parents as first in the list
1715
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1716
self.target.fix_parents(version, new_parents)
1722
InterVersionedFile.register_optimiser(InterKnit)
1725
class WeaveToKnit(InterVersionedFile):
1726
"""Optimised code paths for weave to knit operations."""
1728
_matching_file_from_factory = bzrlib.weave.WeaveFile
1729
_matching_file_to_factory = KnitVersionedFile
1732
def is_compatible(source, target):
1733
"""Be compatible with weaves to knits."""
1735
return (isinstance(source, bzrlib.weave.Weave) and
1736
isinstance(target, KnitVersionedFile))
1737
except AttributeError:
1740
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1741
"""See InterVersionedFile.join."""
1742
assert isinstance(self.source, bzrlib.weave.Weave)
1743
assert isinstance(self.target, KnitVersionedFile)
1745
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1750
pb = ui.ui_factory.nested_progress_bar()
1752
version_ids = list(version_ids)
1754
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1755
this_versions = set(self.target._index.get_versions())
1756
needed_versions = self.source_ancestry - this_versions
1757
cross_check_versions = self.source_ancestry.intersection(this_versions)
1758
mismatched_versions = set()
1759
for version in cross_check_versions:
1760
# scan to include needed parents.
1761
n1 = set(self.target.get_parents_with_ghosts(version))
1762
n2 = set(self.source.get_parents(version))
1763
# if all of n2's parents are in n1, then its fine.
1764
if n2.difference(n1):
1765
# FIXME TEST this check for cycles being introduced works
1766
# the logic is we have a cycle if in our graph we are an
1767
# ancestor of any of the n2 revisions.
1773
parent_ancestors = self.source.get_ancestry(parent)
1774
if version in parent_ancestors:
1775
raise errors.GraphCycleError([parent, version])
1776
# ensure this parent will be available later.
1777
new_parents = n2.difference(n1)
1778
needed_versions.update(new_parents.difference(this_versions))
1779
mismatched_versions.add(version)
1781
if not needed_versions and not mismatched_versions:
1783
full_list = topo_sort(self.source.get_graph())
1785
version_list = [i for i in full_list if (not self.target.has_version(i)
1786
and i in needed_versions)]
1790
total = len(version_list)
1791
for version_id in version_list:
1792
pb.update("Converting to knit", count, total)
1793
parents = self.source.get_parents(version_id)
1794
# check that its will be a consistent copy:
1795
for parent in parents:
1796
# if source has the parent, we must already have it
1797
assert (self.target.has_version(parent))
1798
self.target.add_lines(
1799
version_id, parents, self.source.get_lines(version_id))
1802
for version in mismatched_versions:
1803
# FIXME RBC 20060309 is this needed?
1804
n1 = set(self.target.get_parents_with_ghosts(version))
1805
n2 = set(self.source.get_parents(version))
1806
# write a combined record to our history preserving the current
1807
# parents as first in the list
1808
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1809
self.target.fix_parents(version, new_parents)
1815
InterVersionedFile.register_optimiser(WeaveToKnit)
1818
class KnitSequenceMatcher(difflib.SequenceMatcher):
1819
"""Knit tuned sequence matcher.
1821
This is based on profiling of difflib which indicated some improvements
1822
for our usage pattern.
1825
def find_longest_match(self, alo, ahi, blo, bhi):
1826
"""Find longest matching block in a[alo:ahi] and b[blo:bhi].
1828
If isjunk is not defined:
1830
Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
1831
alo <= i <= i+k <= ahi
1832
blo <= j <= j+k <= bhi
1833
and for all (i',j',k') meeting those conditions,
1836
and if i == i', j <= j'
1838
In other words, of all maximal matching blocks, return one that
1839
starts earliest in a, and of all those maximal matching blocks that
1840
start earliest in a, return the one that starts earliest in b.
1842
>>> s = SequenceMatcher(None, " abcd", "abcd abcd")
1843
>>> s.find_longest_match(0, 5, 0, 9)
1846
If isjunk is defined, first the longest matching block is
1847
determined as above, but with the additional restriction that no
1848
junk element appears in the block. Then that block is extended as
1849
far as possible by matching (only) junk elements on both sides. So
1850
the resulting block never matches on junk except as identical junk
1851
happens to be adjacent to an "interesting" match.
1853
Here's the same example as before, but considering blanks to be
1854
junk. That prevents " abcd" from matching the " abcd" at the tail
1855
end of the second sequence directly. Instead only the "abcd" can
1856
match, and matches the leftmost "abcd" in the second sequence:
1858
>>> s = SequenceMatcher(lambda x: x==" ", " abcd", "abcd abcd")
1859
>>> s.find_longest_match(0, 5, 0, 9)
1862
If no blocks match, return (alo, blo, 0).
1864
>>> s = SequenceMatcher(None, "ab", "c")
1865
>>> s.find_longest_match(0, 2, 0, 1)
1869
# CAUTION: stripping common prefix or suffix would be incorrect.
1873
# Longest matching block is "ab", but if common prefix is
1874
# stripped, it's "a" (tied with "b"). UNIX(tm) diff does so
1875
# strip, so ends up claiming that ab is changed to acab by
1876
# inserting "ca" in the middle. That's minimal but unintuitive:
1877
# "it's obvious" that someone inserted "ac" at the front.
1878
# Windiff ends up at the same place as diff, but by pairing up
1879
# the unique 'b's and then matching the first two 'a's.
1881
a, b, b2j, isbjunk = self.a, self.b, self.b2j, self.isbjunk
1882
besti, bestj, bestsize = alo, blo, 0
1883
# find longest junk-free match
1884
# during an iteration of the loop, j2len[j] = length of longest
1885
# junk-free match ending with a[i-1] and b[j]
1889
for i in xrange(alo, ahi):
1890
# look at all instances of a[i] in b; note that because
1891
# b2j has no junk keys, the loop is skipped if a[i] is junk
1892
j2lenget = j2len.get
1895
# changing b2j.get(a[i], nothing) to a try:KeyError pair produced the
1896
# following improvement
1897
# 704 0 4650.5320 2620.7410 bzrlib.knit:1336(find_longest_match)
1898
# +326674 0 1655.1210 1655.1210 +<method 'get' of 'dict' objects>
1899
# +76519 0 374.6700 374.6700 +<method 'has_key' of 'dict' objects>
1901
# 704 0 3733.2820 2209.6520 bzrlib.knit:1336(find_longest_match)
1902
# +211400 0 1147.3520 1147.3520 +<method 'get' of 'dict' objects>
1903
# +76519 0 376.2780 376.2780 +<method 'has_key' of 'dict' objects>
1915
k = newj2len[j] = 1 + j2lenget(-1 + j, 0)
1917
besti, bestj, bestsize = 1 + i-k, 1 + j-k, k
1920
# Extend the best by non-junk elements on each end. In particular,
1921
# "popular" non-junk elements aren't in b2j, which greatly speeds
1922
# the inner loop above, but also means "the best" match so far
1923
# doesn't contain any junk *or* popular non-junk elements.
1924
while besti > alo and bestj > blo and \
1925
not isbjunk(b[bestj-1]) and \
1926
a[besti-1] == b[bestj-1]:
1927
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1928
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1929
not isbjunk(b[bestj+bestsize]) and \
1930
a[besti+bestsize] == b[bestj+bestsize]:
1933
# Now that we have a wholly interesting match (albeit possibly
1934
# empty!), we may as well suck up the matching junk on each
1935
# side of it too. Can't think of a good reason not to, and it
1936
# saves post-processing the (possibly considerable) expense of
1937
# figuring out what to do with it. In the case of an empty
1938
# interesting match, this is clearly the right thing to do,
1939
# because no other kind of match is possible in the regions.
1940
while besti > alo and bestj > blo and \
1941
isbjunk(b[bestj-1]) and \
1942
a[besti-1] == b[bestj-1]:
1943
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1944
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1945
isbjunk(b[bestj+bestsize]) and \
1946
a[besti+bestsize] == b[bestj+bestsize]:
1947
bestsize = bestsize + 1
1949
return besti, bestj, bestsize
added
removed
bzrlib/knit.py
