~bzr-pqm/bzr/bzr.dev

#! /usr/bin/env python

# -*- coding: UTF-8 -*-

# 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

"""Tree classes, representing directory at point in time.

"""

from sets import Set

import os.path, os, fnmatch

from inventory import Inventory

from trace import mutter, note

from osutils import pumpfile, compare_files, filesize, quotefn, sha_file, \

     joinpath, splitpath, appendpath, isdir, isfile, file_kind

from errors import bailout

import branch

from stat import S_ISREG, S_ISDIR, ST_MODE, ST_SIZE

import bzrlib

class Tree:

    """Abstract file tree.

    There are several subclasses:

    * `WorkingTree` exists as files on disk editable by the user.

    * `RevisionTree` is a tree as recorded at some point in the past.

    * `EmptyTree`

    Trees contain an `Inventory` object, and also know how to retrieve

    file texts mentioned in the inventory, either from a working

    directory or from a store.

    It is possible for trees to contain files that are not described

    in their inventory or vice versa; for this use `filenames()`.

    Trees can be compared, etc, regardless of whether they are working

    trees or versioned trees.

    """

    def get_file(self, file_id):

        """Return an open file-like object for given file id."""

        raise NotImplementedError()

    def has_filename(self, filename):

        """True if the tree has given filename."""

        raise NotImplementedError()

    def has_id(self, file_id):

        return self.inventory.has_id(file_id)

    def id_set(self):

        """Return set of all ids in this tree."""

        return self.inventory.id_set()

    def id2path(self, file_id):

        return self.inventory.id2path(file_id)

    def _get_inventory(self):

        return self._inventory

    inventory = property(_get_inventory,

                         doc="Inventory of this Tree")

    def _check_retrieved(self, ie, f):

        # TODO: Test this check by damaging the store?

        if ie.text_size is not None:

            fs = filesize(f)

            if fs != ie.text_size:

                bailout("mismatched size for file %r in %r" % (ie.file_id, self._store),

                        ["inventory expects %d bytes" % ie.text_size,

                         "file is actually %d bytes" % fs,

                         "store is probably damaged/corrupt"])

        f_hash = sha_file(f)

        f.seek(0)

        if ie.text_sha1 != f_hash:

            bailout("wrong SHA-1 for file %r in %r" % (ie.file_id, self._store),

                    ["inventory expects %s" % ie.text_sha1,

                     "file is actually %s" % f_hash,

                     "store is probably damaged/corrupt"])

    def export(self, dest):

        """Export this tree to a new directory.

        `dest` should not exist, and will be created holding the

        contents of this tree.

        :todo: To handle subdirectories we need to create the

               directories first.

        :note: If the export fails, the destination directory will be

               left in a half-assed state.

        """

        os.mkdir(dest)

        mutter('export version %r' % self)

        inv = self.inventory

        for dp, ie in inv.iter_entries():

            kind = ie.kind

            fullpath = appendpath(dest, dp)

            if kind == 'directory':

                os.mkdir(fullpath)

            elif kind == 'file':

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

            else:

                bailout("don't know how to export {%s} of kind %r", fid, kind)

            mutter("  export {%s} kind %s to %s" % (ie.file_id, kind, fullpath))

class WorkingTree(Tree):

    """Working copy tree.

    The inventory is held in the `Branch` working-inventory, and the

    files are in a directory on disk.

    It is possible for a `WorkingTree` to have a filename which is

    not listed in the Inventory and vice versa.

    """

    def __init__(self, basedir, inv):

        self._inventory = inv

        self.basedir = basedir

        self.path2id = inv.path2id

    def __repr__(self):

        return "<%s of %s>" % (self.__class__.__name__,

                               self.basedir)

    def _rel(self, filename):

        return os.path.join(self.basedir, filename)

    def has_filename(self, filename):

        return os.path.exists(self._rel(filename))

    def get_file(self, file_id):

        return file(self._get_store_filename(file_id), 'rb')

    def _get_store_filename(self, file_id):

        return self._rel(self.id2path(file_id))

    def get_file_size(self, file_id):

        return os.stat(self._get_store_filename(file_id))[ST_SIZE]

    def get_file_sha1(self, file_id):

        f = self.get_file(file_id)

        return sha_file(f)

    def file_class(self, filename):

        if self.path2id(filename):

            return 'V'

        elif self.is_ignored(filename):

            return 'I'

        else:

            return '?'

    def file_kind(self, filename):

        if isfile(self._rel(filename)):

            return 'file'

        elif isdir(self._rel(filename)):

            return 'directory'

        else:

            return 'unknown'

    def list_files(self):

        """Recursively list all files as (path, class, kind, id).

        Lists, but does not descend into unversioned directories.

        This does not include files that have been deleted in this

        tree.

        Skips the control directory.

        """

        inv = self.inventory

        def descend(from_dir, from_dir_id, dp):

            ls = os.listdir(dp)

            ls.sort()

            for f in ls:

                if bzrlib.BZRDIR == f:

                    continue

                # path within tree

                fp = appendpath(from_dir, f)

                # absolute path

                fap = appendpath(dp, f)

                f_ie = inv.get_child(from_dir_id, f)

                if f_ie:

                    c = 'V'

                elif self.is_ignored(fp):

                    c = 'I'

                else:

                    c = '?'

                fk = file_kind(fap)

                if f_ie:

                    if f_ie.kind != fk:

                        bailout("file %r entered as kind %r id %r, now of kind %r"

                                % (fap, f_ie.kind, f_ie.file_id, fk))

                yield fp, c, fk, (f_ie and f_ie.file_id)

                if fk != 'directory':

                    continue

                if c != 'V':

                    # don't descend unversioned directories

                    continue

                for ff in descend(fp, f_ie.file_id, fap):

                    yield ff

        for f in descend('', None, self.basedir):

            yield f

    def unknowns(self, path='', dir_id=None):

        """Yield names of unknown files in this WorkingTree.

        If there are any unknown directories then only the directory is

        returned, not all its children.  But if there are unknown files

        under a versioned subdirectory, they are returned.

        Currently returned depth-first, sorted by name within directories.

        """

        for fpath, fclass, fkind, fid in self.list_files():

            if fclass == '?':

                yield fpath

    def ignored_files(self):

        for fpath, fclass, fkind, fid in self.list_files():

            if fclass == 'I':

                yield fpath

    def is_ignored(self, filename):

        """Check whether the filename matches an ignore pattern."""

        ## TODO: Take them from a file, not hardcoded

        ## TODO: Use extended zsh-style globs maybe?

        ## TODO: Use '**' to match directories?

        ## TODO: Patterns without / should match in subdirectories?

        for i in bzrlib.DEFAULT_IGNORE:

            if fnmatch.fnmatchcase(filename, i):

                return True

        return False

class RevisionTree(Tree):

    """Tree viewing a previous revision.

    File text can be retrieved from the text store.

    :todo: Some kind of `__repr__` method, but a good one

           probably means knowing the branch and revision number,

           or at least passing a description to the constructor.

    """

    def __init__(self, store, inv):

        self._store = store

        self._inventory = inv

    def get_file(self, file_id):

        ie = self._inventory[file_id]

        f = self._store[ie.text_id]

        mutter("  get fileid{%s} from %r" % (file_id, self))

        fs = filesize(f)

        if ie.text_size is None:

            note("warning: no text size recorded on %r" % ie)

        self._check_retrieved(ie, f)

        return f

    def get_file_size(self, file_id):

        return self._inventory[file_id].text_size

    def get_file_sha1(self, file_id):

        ie = self._inventory[file_id]

        return ie.text_sha1

    def has_filename(self, filename):

        return bool(self.inventory.path2id(filename))

    def list_files(self):

        # The only files returned by this are those from the version

        for path, entry in self.inventory.iter_entries():

            yield path, 'V', entry.kind, entry.file_id

class EmptyTree(Tree):

    def __init__(self):

        self._inventory = Inventory()

    def has_filename(self, filename):

        return False

    def list_files(self):

        if False:  # just to make it a generator

            yield None

######################################################################

# diff

# TODO: Merge these two functions into a single one that can operate

# on either a whole tree or a set of files.

# TODO: Return the diff in order by filename, not by category or in

# random order.  Can probably be done by lock-stepping through the

# filenames from both trees.

def file_status(filename, old_tree, new_tree):

    """Return single-letter status, old and new names for a file.

    The complexity here is in deciding how to represent renames;

    many complex cases are possible.

    """

    old_inv = old_tree.inventory

    new_inv = new_tree.inventory

    new_id = new_inv.path2id(filename)

    old_id = old_inv.path2id(filename)

    if not new_id and not old_id:

        # easy: doesn't exist in either; not versioned at all

        if new_tree.is_ignored(filename):

            return 'I', None, None

        else:

            return '?', None, None

    elif new_id:

        # There is now a file of this name, great.

        pass

    else:

        # There is no longer a file of this name, but we can describe

        # what happened to the file that used to have

        # this name.  There are two possibilities: either it was

        # deleted entirely, or renamed.

        assert old_id

        if new_inv.has_id(old_id):

            return 'X', old_inv.id2path(old_id), new_inv.id2path(old_id)

        else:

            return 'D', old_inv.id2path(old_id), None

    # if the file_id is new in this revision, it is added

    if new_id and not old_inv.has_id(new_id):

        return 'A'

    # if there used to be a file of this name, but that ID has now

    # disappeared, it is deleted

    if old_id and not new_inv.has_id(old_id):

        return 'D'

    return 'wtf?'