~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# FIXME: This refactoring of the workingtree code doesn't seem to keep 

# the WorkingTree's copy of the inventory in sync with the branch.  The

# branch modifies its working inventory when it does a commit to make

# missing files permanently removed.

# TODO: Maybe also keep the full path of the entry, and the children?

# But those depend on its position within a particular inventory, and

# it would be nice not to need to hold the backpointer here.

# This should really be an id randomly assigned when the tree is

# created, but it's not for now.

ROOT_ID = "TREE_ROOT"

import os.path

import re

import sys

import tarfile

import types

import bzrlib

from bzrlib.osutils import (pumpfile, quotefn, splitpath, joinpath,

                            pathjoin, sha_strings)

from bzrlib.errors import (NotVersionedError, InvalidEntryName,

                           BzrError, BzrCheckError, BinaryFile)

from bzrlib.trace import mutter

class InventoryEntry(object):

    """Description of a versioned file.

    An InventoryEntry has the following fields, which are also

    present in the XML inventory-entry element:

    file_id

    name

        (within the parent directory)

    parent_id

        file_id of the parent directory, or ROOT_ID

    revision

        the revision_id in which this variation of this file was 

        introduced.

    executable

        Indicates that this file should be executable on systems

        that support it.

    text_sha1

        sha-1 of the text of the file

    text_size

        size in bytes of the text of the file

    (reading a version 4 tree created a text_id field.)

    >>> i = Inventory()

    >>> i.path2id('')

    'TREE_ROOT'

    >>> i.add(InventoryDirectory('123', 'src', ROOT_ID))

    InventoryDirectory('123', 'src', parent_id='TREE_ROOT')

    >>> i.add(InventoryFile('2323', 'hello.c', parent_id='123'))

    InventoryFile('2323', 'hello.c', parent_id='123')

    >>> shouldbe = {0: 'src', 1: pathjoin('src','hello.c')}

    >>> for ix, j in enumerate(i.iter_entries()):

    ...   print (j[0] == shouldbe[ix], j[1])

    ... 

    (True, InventoryDirectory('123', 'src', parent_id='TREE_ROOT'))

    (True, InventoryFile('2323', 'hello.c', parent_id='123'))

    >>> i.add(InventoryFile('2323', 'bye.c', '123'))

    Traceback (most recent call last):

    ...

    BzrError: inventory already contains entry with id {2323}

    >>> i.add(InventoryFile('2324', 'bye.c', '123'))

    InventoryFile('2324', 'bye.c', parent_id='123')

    >>> i.add(InventoryDirectory('2325', 'wibble', '123'))

    InventoryDirectory('2325', 'wibble', parent_id='123')

    >>> i.path2id('src/wibble')

    '2325'

    >>> '2325' in i

    True

    >>> i.add(InventoryFile('2326', 'wibble.c', '2325'))

    InventoryFile('2326', 'wibble.c', parent_id='2325')

    >>> i['2326']

    InventoryFile('2326', 'wibble.c', parent_id='2325')

    >>> for path, entry in i.iter_entries():

    ...     print path

    ...     assert i.path2id(path)

    ... 

    src

    src/bye.c

    src/hello.c

    src/wibble

    src/wibble/wibble.c

    >>> i.id2path('2326')

    'src/wibble/wibble.c'

    """

    # Constants returned by describe_change()

    #

    # TODO: These should probably move to some kind of FileChangeDescription 

    # class; that's like what's inside a TreeDelta but we want to be able to 

    # generate them just for one file at a time.

    RENAMED = 'renamed'

    MODIFIED_AND_RENAMED = 'modified and renamed'

    __slots__ = ['text_sha1', 'text_size', 'file_id', 'name', 'kind',

                 'text_id', 'parent_id', 'children', 'executable', 

                 'revision']

    def _add_text_to_weave(self, new_lines, parents, weave_store, transaction):

        versionedfile = weave_store.get_weave_or_empty(self.file_id,

                                                       transaction)

        versionedfile.add_lines(self.revision, parents, new_lines)

        versionedfile.clear_cache()

    def detect_changes(self, old_entry):

        """Return a (text_modified, meta_modified) from this to old_entry.

        _read_tree_state must have been called on self and old_entry prior to 

        calling detect_changes.

        """

        return False, False

    def diff(self, text_diff, from_label, tree, to_label, to_entry, to_tree,

             output_to, reverse=False):

        """Perform a diff from this to to_entry.

        text_diff will be used for textual difference calculation.

        This is a template method, override _diff in child classes.

        """

        self._read_tree_state(tree.id2path(self.file_id), tree)

        if to_entry:

            # cannot diff from one kind to another - you must do a removal

            # and an addif they do not match.

            assert self.kind == to_entry.kind

            to_entry._read_tree_state(to_tree.id2path(to_entry.file_id),

                                      to_tree)

        self._diff(text_diff, from_label, tree, to_label, to_entry, to_tree,

                   output_to, reverse)

    def _diff(self, text_diff, from_label, tree, to_label, to_entry, to_tree,

             output_to, reverse=False):

        """Perform a diff between two entries of the same kind."""

    def find_previous_heads(self, previous_inventories,

                            versioned_file_store,

                            transaction,

                            entry_vf=None):

        """Return the revisions and entries that directly preceed this.

        Returned as a map from revision to inventory entry.

        This is a map containing the file revisions in all parents

        for which the file exists, and its revision is not a parent of

        any other. If the file is new, the set will be empty.

        :param versioned_file_store: A store where ancestry data on this

                                     file id can be queried.

        :param transaction: The transaction that queries to the versioned 

                            file store should be completed under.

        :param entry_vf: The entry versioned file, if its already available.

        """

        def get_ancestors(weave, entry):

            return set(weave.get_ancestry(entry.revision))

        # revision:ie mapping for each ie found in previous_inventories.

        candidates = {}

        # revision:ie mapping with one revision for each head.

        heads = {}

        # revision: ancestor list for each head

        head_ancestors = {}

        # identify candidate head revision ids.

        for inv in previous_inventories:

            if self.file_id in inv:

                ie = inv[self.file_id]

                assert ie.file_id == self.file_id

                if ie.revision in candidates:

                    # same revision value in two different inventories:

                    # correct possible inconsistencies:

                    #     * there was a bug in revision updates with 'x' bit 

                    #       support.

                    try:

                        if candidates[ie.revision].executable != ie.executable:

                            candidates[ie.revision].executable = False

                            ie.executable = False

                    except AttributeError:

                        pass

                    # must now be the same.

                    assert candidates[ie.revision] == ie

                else:

                    # add this revision as a candidate.

                    candidates[ie.revision] = ie

        # common case optimisation

        if len(candidates) == 1:

            # if there is only one candidate revision found

            # then we can opening the versioned file to access ancestry:

            # there cannot be any ancestors to eliminate when there is 

            # only one revision available.

            heads[ie.revision] = ie

            return heads

        # eliminate ancestors amongst the available candidates:

        # heads are those that are not an ancestor of any other candidate

        # - this provides convergence at a per-file level.

        for ie in candidates.values():

            # may be an ancestor of a known head:

            already_present = 0 != len(

                [head for head in heads 

                 if ie.revision in head_ancestors[head]])

            if already_present:

                # an ancestor of an analyzed candidate.

                continue

            # not an ancestor of a known head:

            # load the versioned file for this file id if needed

            if entry_vf is None:

                entry_vf = versioned_file_store.get_weave_or_empty(

                    self.file_id, transaction)

            ancestors = get_ancestors(entry_vf, ie)

            # may knock something else out:

            check_heads = list(heads.keys())

            for head in check_heads:

                if head in ancestors:

                    # this previously discovered 'head' is not

                    # really a head - its an ancestor of the newly 

                    # found head,

                    heads.pop(head)

            head_ancestors[ie.revision] = ancestors

            heads[ie.revision] = ie

        return heads

    def get_tar_item(self, root, dp, now, tree):

        """Get a tarfile item and a file stream for its content."""

        item = tarfile.TarInfo(pathjoin(root, dp))

        # TODO: would be cool to actually set it to the timestamp of the

        # revision it was last changed

        item.mtime = now

        fileobj = self._put_in_tar(item, tree)

        return item, fileobj

    def has_text(self):

        """Return true if the object this entry represents has textual data.

        Note that textual data includes binary content.

        Also note that all entries get weave files created for them.

        This attribute is primarily used when upgrading from old trees that

        did not have the weave index for all inventory entries.

        """

        return False

    def __init__(self, file_id, name, parent_id, text_id=None):

        """Create an InventoryEntry

        The filename must be a single component, relative to the

        parent directory; it cannot be a whole path or relative name.

        >>> e = InventoryFile('123', 'hello.c', ROOT_ID)

        >>> e.name

        'hello.c'

        >>> e.file_id

        '123'

        >>> e = InventoryFile('123', 'src/hello.c', ROOT_ID)

        Traceback (most recent call last):

        InvalidEntryName: Invalid entry name: src/hello.c

        """

        assert isinstance(name, basestring), name

        if '/' in name or '\\' in name:

            raise InvalidEntryName(name=name)

        self.executable = False

        self.revision = None

        self.text_sha1 = None

        self.text_size = None

        self.file_id = file_id

        self.name = name

        self.text_id = text_id

        self.parent_id = parent_id

        self.symlink_target = None

    def kind_character(self):

        """Return a short kind indicator useful for appending to names."""

        raise BzrError('unknown kind %r' % self.kind)

    known_kinds = ('file', 'directory', 'symlink', 'root_directory')

    def _put_in_tar(self, item, tree):

        """populate item for stashing in a tar, and return the content stream.

        If no content is available, return None.

        """

        raise BzrError("don't know how to export {%s} of kind %r" %

                       (self.file_id, self.kind))

    def put_on_disk(self, dest, dp, tree):

        """Create a representation of self on disk in the prefix dest.

        This is a template method - implement _put_on_disk in subclasses.

        """

        fullpath = pathjoin(dest, dp)

        self._put_on_disk(fullpath, tree)

        mutter("  export {%s} kind %s to %s", self.file_id,

                self.kind, fullpath)

    def _put_on_disk(self, fullpath, tree):

        """Put this entry onto disk at fullpath, from tree tree."""

        raise BzrError("don't know how to export {%s} of kind %r" % (self.file_id, self.kind))

    def sorted_children(self):

        l = self.children.items()

        l.sort()

        return l

    @staticmethod

    def versionable_kind(kind):

        return kind in ('file', 'directory', 'symlink')

    def check(self, checker, rev_id, inv, tree):

        """Check this inventory entry is intact.

        This is a template method, override _check for kind specific

        tests.

        :param checker: Check object providing context for the checks; 

             can be used to find out what parts of the repository have already

             been checked.

        :param rev_id: Revision id from which this InventoryEntry was loaded.

             Not necessarily the last-changed revision for this file.

        :param inv: Inventory from which the entry was loaded.

        :param tree: RevisionTree for this entry.

        """

        if self.parent_id != None:

            if not inv.has_id(self.parent_id):

                raise BzrCheckError('missing parent {%s} in inventory for revision {%s}'

                        % (self.parent_id, rev_id))

        self._check(checker, rev_id, tree)

    def _check(self, checker, rev_id, tree):

        """Check this inventory entry for kind specific errors."""

        raise BzrCheckError('unknown entry kind %r in revision {%s}' % 

                            (self.kind, rev_id))

    def copy(self):

        """Clone this inventory entry."""

        raise NotImplementedError

    @staticmethod

    def describe_change(old_entry, new_entry):

        """Describe the change between old_entry and this.

        This smells of being an InterInventoryEntry situation, but as its

        the first one, we're making it a static method for now.

        An entry with a different parent, or different name is considered 

        to be renamed. Reparenting is an internal detail.

        Note that renaming the parent does not trigger a rename for the

        child entry itself.

        """

        # TODO: Perhaps return an object rather than just a string

        if old_entry is new_entry:

            # also the case of both being None

            return 'unchanged'

        elif old_entry is None:

            return 'added'

        elif new_entry is None:

            return 'removed'

        text_modified, meta_modified = new_entry.detect_changes(old_entry)

        if text_modified or meta_modified:

            modified = True

        else:

            modified = False

        # TODO 20060511 (mbp, rbc) factor out 'detect_rename' here.

        if old_entry.parent_id != new_entry.parent_id:

            renamed = True

        elif old_entry.name != new_entry.name:

            renamed = True

        else:

            renamed = False

        if renamed and not modified:

            return InventoryEntry.RENAMED

        if modified and not renamed:

            return 'modified'

        if modified and renamed:

            return InventoryEntry.MODIFIED_AND_RENAMED

        return 'unchanged'

    def __repr__(self):

        return ("%s(%r, %r, parent_id=%r)"

                % (self.__class__.__name__,

                   self.file_id,

                   self.name,

                   self.parent_id))

    def snapshot(self, revision, path, previous_entries,

                 work_tree, weave_store, transaction):

        """Make a snapshot of this entry which may or may not have changed.

        This means that all its fields are populated, that it has its

        text stored in the text store or weave.

        """

        mutter('new parents of %s are %r', path, previous_entries)

        self._read_tree_state(path, work_tree)

        if len(previous_entries) == 1:

            # cannot be unchanged unless there is only one parent file rev.

            parent_ie = previous_entries.values()[0]

            if self._unchanged(parent_ie):

                mutter("found unchanged entry")

                self.revision = parent_ie.revision

                return "unchanged"

        return self._snapshot_into_revision(revision, previous_entries, 

                                            work_tree, weave_store, transaction)

    def _snapshot_into_revision(self, revision, previous_entries, work_tree,

                                weave_store, transaction):

        """Record this revision unconditionally into a store.

        The entry's last-changed revision property (`revision`) is updated to 

        that of the new revision.

        :param revision: id of the new revision that is being recorded.

        :returns: String description of the commit (e.g. "merged", "modified"), etc.

        """

        mutter('new revision {%s} for {%s}', revision, self.file_id)

        self.revision = revision

        self._snapshot_text(previous_entries, work_tree, weave_store,

                            transaction)

    def _snapshot_text(self, file_parents, work_tree, weave_store, transaction): 

        """Record the 'text' of this entry, whatever form that takes.

        This default implementation simply adds an empty text.

        """

        mutter('storing file {%s} in revision {%s}',

               self.file_id, self.revision)

        self._add_text_to_weave([], file_parents.keys(), weave_store, transaction)

    def __eq__(self, other):

        if not isinstance(other, InventoryEntry):

            return NotImplemented

        return ((self.file_id == other.file_id)

                and (self.name == other.name)

                and (other.symlink_target == self.symlink_target)

                and (self.text_sha1 == other.text_sha1)

                and (self.text_size == other.text_size)

                and (self.text_id == other.text_id)

                and (self.parent_id == other.parent_id)

                and (self.kind == other.kind)

                and (self.revision == other.revision)

                and (self.executable == other.executable)

                )

    def __ne__(self, other):

        return not (self == other)

    def __hash__(self):

        raise ValueError('not hashable')

    def _unchanged(self, previous_ie):

        """Has this entry changed relative to previous_ie.

        This method should be overriden in child classes.

        """

        compatible = True

        # different inv parent

        if previous_ie.parent_id != self.parent_id:

            compatible = False

        # renamed

        elif previous_ie.name != self.name:

            compatible = False

        return compatible

    def _read_tree_state(self, path, work_tree):

        """Populate fields in the inventory entry from the given tree.

        Note that this should be modified to be a noop on virtual trees

        as all entries created there are prepopulated.

        """

        # TODO: Rather than running this manually, we should check the 

        # working sha1 and other expensive properties when they're

        # first requested, or preload them if they're already known

        pass            # nothing to do by default

    def _forget_tree_state(self):

        pass

class RootEntry(InventoryEntry):

    def _check(self, checker, rev_id, tree):

        """See InventoryEntry._check"""

    def __init__(self, file_id):

        self.file_id = file_id

        self.children = {}

        self.kind = 'root_directory'

        self.parent_id = None

        self.name = u''

    def __eq__(self, other):

        if not isinstance(other, RootEntry):

            return NotImplemented

        return (self.file_id == other.file_id) \

               and (self.children == other.children)

class InventoryDirectory(InventoryEntry):

    """A directory in an inventory."""

    def _check(self, checker, rev_id, tree):

        """See InventoryEntry._check"""

        if self.text_sha1 != None or self.text_size != None or self.text_id != None:

            raise BzrCheckError('directory {%s} has text in revision {%s}'

                                % (self.file_id, rev_id))

    def copy(self):

        other = InventoryDirectory(self.file_id, self.name, self.parent_id)

        other.revision = self.revision

        # note that children are *not* copied; they're pulled across when

        # others are added

        return other

    def __init__(self, file_id, name, parent_id):

        super(InventoryDirectory, self).__init__(file_id, name, parent_id)

        self.children = {}

        self.kind = 'directory'

    def kind_character(self):

        """See InventoryEntry.kind_character."""

        return '/'

    def _put_in_tar(self, item, tree):

        """See InventoryEntry._put_in_tar."""

        item.type = tarfile.DIRTYPE

        fileobj = None

        item.name += '/'

        item.size = 0

        item.mode = 0755

        return fileobj

    def _put_on_disk(self, fullpath, tree):

        """See InventoryEntry._put_on_disk."""

        os.mkdir(fullpath)

class InventoryFile(InventoryEntry):

    """A file in an inventory."""

    def _check(self, checker, tree_revision_id, tree):

        """See InventoryEntry._check"""

        t = (self.file_id, self.revision)

        if t in checker.checked_texts:

            prev_sha = checker.checked_texts[t]

            if prev_sha != self.text_sha1:

                raise BzrCheckError('mismatched sha1 on {%s} in {%s}' %

                                    (self.file_id, tree_revision_id))

            else:

                checker.repeated_text_cnt += 1

                return

        if self.file_id not in checker.checked_weaves:

            mutter('check weave {%s}', self.file_id)

            w = tree.get_weave(self.file_id)

            # Not passing a progress bar, because it creates a new

            # progress, which overwrites the current progress,

            # and doesn't look nice

            w.check()

            checker.checked_weaves[self.file_id] = True

        else:

            w = tree.get_weave(self.file_id)

        mutter('check version {%s} of {%s}', tree_revision_id, self.file_id)

        checker.checked_text_cnt += 1

        # We can't check the length, because Weave doesn't store that

        # information, and the whole point of looking at the weave's

        # sha1sum is that we don't have to extract the text.

        if self.text_sha1 != w.get_sha1(self.revision):

            raise BzrCheckError('text {%s} version {%s} wrong sha1' 

                                % (self.file_id, self.revision))

        checker.checked_texts[t] = self.text_sha1

    def copy(self):

        other = InventoryFile(self.file_id, self.name, self.parent_id)

        other.executable = self.executable

        other.text_id = self.text_id

        other.text_sha1 = self.text_sha1

        other.text_size = self.text_size

        other.revision = self.revision

        return other

    def detect_changes(self, old_entry):

        """See InventoryEntry.detect_changes."""

        assert self.text_sha1 != None

        assert old_entry.text_sha1 != None

        text_modified = (self.text_sha1 != old_entry.text_sha1)

        meta_modified = (self.executable != old_entry.executable)

        return text_modified, meta_modified

    def _diff(self, text_diff, from_label, tree, to_label, to_entry, to_tree,

             output_to, reverse=False):

        """See InventoryEntry._diff."""

        try:

            from_text = tree.get_file(self.file_id).readlines()

            if to_entry:

                to_text = to_tree.get_file(to_entry.file_id).readlines()

            else:

                to_text = []

            if not reverse:

                text_diff(from_label, from_text,

                          to_label, to_text, output_to)

            else:

                text_diff(to_label, to_text,

                          from_label, from_text, output_to)

        except BinaryFile:

            if reverse:

                label_pair = (to_label, from_label)

            else:

                label_pair = (from_label, to_label)

            print >> output_to, "Binary files %s and %s differ" % label_pair

    def has_text(self):

        """See InventoryEntry.has_text."""

        return True

    def __init__(self, file_id, name, parent_id):

        super(InventoryFile, self).__init__(file_id, name, parent_id)

        self.kind = 'file'

    def kind_character(self):

        """See InventoryEntry.kind_character."""

        return ''

    def _put_in_tar(self, item, tree):

        """See InventoryEntry._put_in_tar."""

        item.type = tarfile.REGTYPE

        fileobj = tree.get_file(self.file_id)

        item.size = self.text_size

        if tree.is_executable(self.file_id):

            item.mode = 0755

        else:

            item.mode = 0644

        return fileobj

    def _put_on_disk(self, fullpath, tree):

        """See InventoryEntry._put_on_disk."""

        pumpfile(tree.get_file(self.file_id), file(fullpath, 'wb'))

        if tree.is_executable(self.file_id):

            os.chmod(fullpath, 0755)

    def _read_tree_state(self, path, work_tree):

        """See InventoryEntry._read_tree_state."""

        self.text_sha1 = work_tree.get_file_sha1(self.file_id)

        self.executable = work_tree.is_executable(self.file_id)

    def _forget_tree_state(self):

        self.text_sha1 = None

        self.executable = None

    def _snapshot_text(self, file_parents, work_tree, versionedfile_store, transaction):

        """See InventoryEntry._snapshot_text."""

        mutter('storing text of file {%s} in revision {%s} into %r',

               self.file_id, self.revision, versionedfile_store)

        # special case to avoid diffing on renames or 

        # reparenting

        if (len(file_parents) == 1

            and self.text_sha1 == file_parents.values()[0].text_sha1

            and self.text_size == file_parents.values()[0].text_size):

            previous_ie = file_parents.values()[0]

            versionedfile = versionedfile_store.get_weave(self.file_id, transaction)

            versionedfile.clone_text(self.revision, previous_ie.revision, file_parents.keys())

        else:

            new_lines = work_tree.get_file(self.file_id).readlines()