~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006, 2009 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Serializer factory for reading and writing bundles.

"""

from __future__ import absolute_import

from bzrlib import (

    errors,

    ui,

    )

from bzrlib.bundle.serializer import (BundleSerializer,

                                      _get_bundle_header,

                                     )

from bzrlib.bundle.serializer import binary_diff

from bzrlib.bundle.bundle_data import (RevisionInfo, BundleInfo)

from bzrlib.diff import internal_diff

from bzrlib.revision import NULL_REVISION

from bzrlib.testament import StrictTestament

from bzrlib.timestamp import (

    format_highres_date,

    )

from bzrlib.textfile import text_file

from bzrlib.trace import mutter

bool_text = {True: 'yes', False: 'no'}

class Action(object):

    """Represent an action"""

    def __init__(self, name, parameters=None, properties=None):

        self.name = name

        if parameters is None:

            self.parameters = []

        else:

            self.parameters = parameters

        if properties is None:

            self.properties = []

        else:

            self.properties = properties

    def add_utf8_property(self, name, value):

        """Add a property whose value is currently utf8 to the action."""

        self.properties.append((name, value.decode('utf8')))

    def add_property(self, name, value):

        """Add a property to the action"""

        self.properties.append((name, value))

    def add_bool_property(self, name, value):

        """Add a boolean property to the action"""

        self.add_property(name, bool_text[value])

    def write(self, to_file):

        """Write action as to a file"""

        p_texts = [' '.join([self.name]+self.parameters)]

        for prop in self.properties:

            if len(prop) == 1:

                p_texts.append(prop[0])

            else:

                try:

                    p_texts.append('%s:%s' % prop)

                except:

                    raise repr(prop)

        text = ['=== ']

        text.append(' // '.join(p_texts))

        text_line = ''.join(text).encode('utf-8')

        available = 79

        while len(text_line) > available:

            to_file.write(text_line[:available])

            text_line = text_line[available:]

            to_file.write('\n... ')

            available = 79 - len('... ')

        to_file.write(text_line+'\n')

class BundleSerializerV08(BundleSerializer):

    def read(self, f):

        """Read the rest of the bundles from the supplied file.

        :param f: The file to read from

        :return: A list of bundles

        """

        return BundleReader(f).info

    def check_compatible(self):

        if self.source.supports_rich_root():

            raise errors.IncompatibleBundleFormat('0.8', repr(self.source))

    def write(self, source, revision_ids, forced_bases, f):

        """Write the bundless to the supplied files.

        :param source: A source for revision information

        :param revision_ids: The list of revision ids to serialize

        :param forced_bases: A dict of revision -> base that overrides default

        :param f: The file to output to

        """

        self.source = source

        self.revision_ids = revision_ids

        self.forced_bases = forced_bases

        self.to_file = f

        self.check_compatible()

        source.lock_read()

        try:

            self._write_main_header()

            pb = ui.ui_factory.nested_progress_bar()

            try:

                self._write_revisions(pb)

            finally:

                pb.finished()

        finally:

            source.unlock()

    def write_bundle(self, repository, target, base, fileobj):

        return self._write_bundle(repository, target, base, fileobj)

    def _write_main_header(self):

        """Write the header for the changes"""

        f = self.to_file

        f.write(_get_bundle_header('0.8'))

        f.write('#\n')

    def _write(self, key, value, indent=1, trailing_space_when_empty=False):

        """Write out meta information, with proper indenting, etc.

        :param trailing_space_when_empty: To work around a bug in earlier

            bundle readers, when writing an empty property, we use "prop: \n"

            rather than writing "prop:\n".

            If this parameter is True, and value is the empty string, we will

            write an extra space.

        """

        if indent < 1:

            raise ValueError('indentation must be greater than 0')

        f = self.to_file

        f.write('#' + (' ' * indent))

        f.write(key.encode('utf-8'))

        if not value:

            if trailing_space_when_empty and value == '':

                f.write(': \n')

            else:

                f.write(':\n')

        elif isinstance(value, str):

            f.write(': ')

            f.write(value)

            f.write('\n')

        elif isinstance(value, unicode):

            f.write(': ')

            f.write(value.encode('utf-8'))

            f.write('\n')

        else:

            f.write(':\n')

            for entry in value:

                f.write('#' + (' ' * (indent+2)))

                if isinstance(entry, str):

                    f.write(entry)

                else:

                    f.write(entry.encode('utf-8'))

                f.write('\n')

    def _write_revisions(self, pb):

        """Write the information for all of the revisions."""

        # Optimize for the case of revisions in order

        last_rev_id = None

        last_rev_tree = None

        i_max = len(self.revision_ids)

        for i, rev_id in enumerate(self.revision_ids):

            pb.update("Generating revision data", i, i_max)

            rev = self.source.get_revision(rev_id)

            if rev_id == last_rev_id:

                rev_tree = last_rev_tree

            else:

                rev_tree = self.source.revision_tree(rev_id)

            if rev_id in self.forced_bases:

                explicit_base = True

                base_id = self.forced_bases[rev_id]

                if base_id is None:

                    base_id = NULL_REVISION

            else:

                explicit_base = False

                if rev.parent_ids:

                    base_id = rev.parent_ids[-1]

                else:

                    base_id = NULL_REVISION

            if base_id == last_rev_id:

                base_tree = last_rev_tree

            else:

                base_tree = self.source.revision_tree(base_id)

            force_binary = (i != 0)

            self._write_revision(rev, rev_tree, base_id, base_tree,

                                 explicit_base, force_binary)

            last_rev_id = base_id

            last_rev_tree = base_tree

    def _testament_sha1(self, revision_id):

        return StrictTestament.from_revision(self.source,

                                             revision_id).as_sha1()

    def _write_revision(self, rev, rev_tree, base_rev, base_tree,

                        explicit_base, force_binary):

        """Write out the information for a revision."""

        def w(key, value):

            self._write(key, value, indent=1)

        w('message', rev.message.split('\n'))

        w('committer', rev.committer)

        w('date', format_highres_date(rev.timestamp, rev.timezone))

        self.to_file.write('\n')

        self._write_delta(rev_tree, base_tree, rev.revision_id, force_binary)

        w('revision id', rev.revision_id)

        w('sha1', self._testament_sha1(rev.revision_id))

        w('inventory sha1', rev.inventory_sha1)

        if rev.parent_ids:

            w('parent ids', rev.parent_ids)

        if explicit_base:

            w('base id', base_rev)

        if rev.properties:

            self._write('properties', None, indent=1)

            for name, value in sorted(rev.properties.items()):

                self._write(name, value, indent=3,

                            trailing_space_when_empty=True)

        # Add an extra blank space at the end

        self.to_file.write('\n')

    def _write_action(self, name, parameters, properties=None):

        if properties is None:

            properties = []

        p_texts = ['%s:%s' % v for v in properties]

        self.to_file.write('=== ')

        self.to_file.write(' '.join([name]+parameters).encode('utf-8'))

        self.to_file.write(' // '.join(p_texts).encode('utf-8'))

        self.to_file.write('\n')

    def _write_delta(self, new_tree, old_tree, default_revision_id,

                     force_binary):

        """Write out the changes between the trees."""

        DEVNULL = '/dev/null'

        old_label = ''

        new_label = ''

        def do_diff(file_id, old_path, new_path, action, force_binary):

            def tree_lines(tree, require_text=False):

                if tree.has_id(file_id):

                    tree_file = tree.get_file(file_id)

                    if require_text is True:

                        tree_file = text_file(tree_file)

                    return tree_file.readlines()

                else:

                    return []

            try:

                if force_binary:

                    raise errors.BinaryFile()

                old_lines = tree_lines(old_tree, require_text=True)

                new_lines = tree_lines(new_tree, require_text=True)

                action.write(self.to_file)

                internal_diff(old_path, old_lines, new_path, new_lines,

                              self.to_file)

            except errors.BinaryFile:

                old_lines = tree_lines(old_tree, require_text=False)

                new_lines = tree_lines(new_tree, require_text=False)

                action.add_property('encoding', 'base64')

                action.write(self.to_file)

                binary_diff(old_path, old_lines, new_path, new_lines,

                            self.to_file)

        def finish_action(action, file_id, kind, meta_modified, text_modified,

                          old_path, new_path):

            entry = new_tree.root_inventory[file_id]

            if entry.revision != default_revision_id:

                action.add_utf8_property('last-changed', entry.revision)

            if meta_modified:

                action.add_bool_property('executable', entry.executable)

            if text_modified and kind == "symlink":

                action.add_property('target', entry.symlink_target)

            if text_modified and kind == "file":

                do_diff(file_id, old_path, new_path, action, force_binary)

            else:

                action.write(self.to_file)

        delta = new_tree.changes_from(old_tree, want_unchanged=True,

                                      include_root=True)

        for path, file_id, kind in delta.removed:

            action = Action('removed', [kind, path]).write(self.to_file)

        for path, file_id, kind in delta.added:

            action = Action('added', [kind, path], [('file-id', file_id)])

            meta_modified = (kind=='file' and

                             new_tree.is_executable(file_id))

            finish_action(action, file_id, kind, meta_modified, True,

                          DEVNULL, path)

        for (old_path, new_path, file_id, kind,

             text_modified, meta_modified) in delta.renamed:

            action = Action('renamed', [kind, old_path], [(new_path,)])

            finish_action(action, file_id, kind, meta_modified, text_modified,

                          old_path, new_path)

        for (path, file_id, kind,

             text_modified, meta_modified) in delta.modified:

            action = Action('modified', [kind, path])

            finish_action(action, file_id, kind, meta_modified, text_modified,

                          path, path)

        for path, file_id, kind in delta.unchanged:

            new_rev = new_tree.get_file_revision(file_id)

            if new_rev is None:

                continue

            old_rev = old_tree.get_file_revision(file_id)

            if new_rev != old_rev:

                action = Action('modified', [new_tree.kind(file_id),

                                             new_tree.id2path(file_id)])

                action.add_utf8_property('last-changed', new_rev)

                action.write(self.to_file)

class BundleReader(object):

    """This class reads in a bundle from a file, and returns

    a Bundle object, which can then be applied against a tree.

    """

    def __init__(self, from_file):

        """Read in the bundle from the file.

        :param from_file: A file-like object (must have iterator support).

        """

        object.__init__(self)

        self.from_file = iter(from_file)

        self._next_line = None

        self.info = self._get_info()

        # We put the actual inventory ids in the footer, so that the patch

        # is easier to read for humans.

        # Unfortunately, that means we need to read everything before we

        # can create a proper bundle.

        self._read()

        self._validate()

    def _get_info(self):

        return BundleInfo08()

    def _read(self):

        self._next().next()

        while self._next_line is not None:

            if not self._read_revision_header():

                break

            if self._next_line is None:

                break

            self._read_patches()

            self._read_footer()

    def _validate(self):

        """Make sure that the information read in makes sense

        and passes appropriate checksums.

        """

        # Fill in all the missing blanks for the revisions

        # and generate the real_revisions list.

        self.info.complete_info()

    def _next(self):

        """yield the next line, but secretly

        keep 1 extra line for peeking.

        """

        for line in self.from_file:

            last = self._next_line

            self._next_line = line

            if last is not None:

                #mutter('yielding line: %r' % last)

                yield last

        last = self._next_line

        self._next_line = None

        #mutter('yielding line: %r' % last)

        yield last

    def _read_revision_header(self):

        found_something = False

        self.info.revisions.append(RevisionInfo(None))

        for line in self._next():

            # The bzr header is terminated with a blank line

            # which does not start with '#'

            if line is None or line == '\n':

                break

            if not line.startswith('#'):

                continue

            found_something = True

            self._handle_next(line)

        if not found_something:

            # Nothing was there, so remove the added revision

            self.info.revisions.pop()

        return found_something

    def _read_next_entry(self, line, indent=1):

        """Read in a key-value pair

        """

        if not line.startswith('#'):

            raise errors.MalformedHeader('Bzr header did not start with #')

        line = line[1:-1].decode('utf-8') # Remove the '#' and '\n'

        if line[:indent] == ' '*indent:

            line = line[indent:]

        if not line:

            return None, None# Ignore blank lines

        loc = line.find(': ')

        if loc != -1:

            key = line[:loc]

            value = line[loc+2:]

            if not value:

                value = self._read_many(indent=indent+2)

        elif line[-1:] == ':':

            key = line[:-1]

            value = self._read_many(indent=indent+2)

        else:

            raise errors.MalformedHeader('While looking for key: value pairs,'

                    ' did not find the colon %r' % (line))

        key = key.replace(' ', '_')

        #mutter('found %s: %s' % (key, value))

        return key, value

    def _handle_next(self, line):

        if line is None:

            return

        key, value = self._read_next_entry(line, indent=1)

        mutter('_handle_next %r => %r' % (key, value))

        if key is None:

            return

        revision_info = self.info.revisions[-1]

        if key in revision_info.__dict__:

            if getattr(revision_info, key) is None:

                if key in ('file_id', 'revision_id', 'base_id'):

                    value = value.encode('utf8')

                elif key in ('parent_ids'):

                    value = [v.encode('utf8') for v in value]

                setattr(revision_info, key, value)

            else:

                raise errors.MalformedHeader('Duplicated Key: %s' % key)

        else:

            # What do we do with a key we don't recognize

            raise errors.MalformedHeader('Unknown Key: "%s"' % key)

    def _read_many(self, indent):

        """If a line ends with no entry, that means that it should be

        followed with multiple lines of values.

        This detects the end of the list, because it will be a line that

        does not start properly indented.

        """

        values = []

        start = '#' + (' '*indent)

        if self._next_line is None or self._next_line[:len(start)] != start:

            return values

        for line in self._next():

            values.append(line[len(start):-1].decode('utf-8'))

            if self._next_line is None or self._next_line[:len(start)] != start:

                break

        return values

    def _read_one_patch(self):

        """Read in one patch, return the complete patch, along with

        the next line.

        :return: action, lines, do_continue

        """

        #mutter('_read_one_patch: %r' % self._next_line)

        # Peek and see if there are no patches

        if self._next_line is None or self._next_line.startswith('#'):

            return None, [], False

        first = True

        lines = []

        for line in self._next():

            if first:

                if not line.startswith('==='):

                    raise errors.MalformedPatches('The first line of all patches'

                        ' should be a bzr meta line "==="'

                        ': %r' % line)

                action = line[4:-1].decode('utf-8')

            elif line.startswith('... '):

                action += line[len('... '):-1].decode('utf-8')

            if (self._next_line is not None and

                self._next_line.startswith('===')):

                return action, lines, True

            elif self._next_line is None or self._next_line.startswith('#'):

                return action, lines, False

            if first:

                first = False

            elif not line.startswith('... '):

                lines.append(line)

        return action, lines, False

    def _read_patches(self):

        do_continue = True

        revision_actions = []

        while do_continue:

            action, lines, do_continue = self._read_one_patch()

            if action is not None:

                revision_actions.append((action, lines))

        if self.info.revisions[-1].tree_actions is not None:

            raise AssertionError()

        self.info.revisions[-1].tree_actions = revision_actions

    def _read_footer(self):

        """Read the rest of the meta information.

        :param first_line:  The previous step iterates past what it

                            can handle. That extra line is given here.

        """

        for line in self._next():

            self._handle_next(line)

            if self._next_line is None:

                break

            if not self._next_line.startswith('#'):

                # Consume the trailing \n and stop processing

                self._next().next()

                break

class BundleInfo08(BundleInfo):

    def _update_tree(self, bundle_tree, revision_id):

        bundle_tree.note_last_changed('', revision_id)

        BundleInfo._update_tree(self, bundle_tree, revision_id)

    def _testament_sha1_from_revision(self, repository, revision_id):

        testament = StrictTestament.from_revision(repository, revision_id)

        return testament.as_sha1()

    def _testament_sha1(self, revision, tree):

        return StrictTestament(revision, tree).as_sha1()