/brz/remove-bazaar

# Copyright (C) 2005 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

"""WorkingTree object and friends.

A WorkingTree represents the editable working copy of a branch.

Operations which represent the WorkingTree are also done here, 

such as renaming or adding files.  The WorkingTree has an inventory 

which is updated by these operations.  A commit produces a 

new revision based on the workingtree and its inventory.

At the moment every WorkingTree has its own branch.  Remote

WorkingTrees aren't supported.

To get a WorkingTree, call Branch.working_tree():

"""

# TODO: Don't allow WorkingTrees to be constructed for remote branches if 

# they don't work.

# FIXME: I don't know if writing out the cache from the destructor is really a

# good idea, because destructors are considered poor taste in Python, and it's

# not predictable when it will be written out.

# TODO: Give the workingtree sole responsibility for the working inventory;

# remove the variable and references to it from the branch.  This may require

# updating the commit code so as to update the inventory within the working

# copy, and making sure there's only one WorkingTree for any directory on disk.

# At the momenthey may alias the inventory and have old copies of it in memory.

from copy import deepcopy

import os

import stat

import fnmatch

from bzrlib.branch import (Branch,

                           is_control_file,

                           needs_read_lock,

                           needs_write_lock,

                           quotefn)

from bzrlib.errors import (BzrCheckError,

                           BzrError,

                           DivergedBranches,

                           NotBranchError,

                           NotVersionedError)

from bzrlib.inventory import InventoryEntry

from bzrlib.osutils import (appendpath,

                            compact_date,

                            file_kind,

                            isdir,

                            pumpfile,

                            splitpath,

                            rand_bytes,

                            realpath,

                            relpath,

                            rename)

import bzrlib.tree

from bzrlib.trace import mutter

import bzrlib.xml5

def gen_file_id(name):

    """Return new file id.

    This should probably generate proper UUIDs, but for the moment we

    cope with just randomness because running uuidgen every time is

    slow."""

    import re

    from binascii import hexlify

    from time import time

    # get last component

    idx = name.rfind('/')

    if idx != -1:

        name = name[idx+1 : ]

    idx = name.rfind('\\')

    if idx != -1:

        name = name[idx+1 : ]

    # make it not a hidden file

    name = name.lstrip('.')

    # remove any wierd characters; we don't escape them but rather

    # just pull them out

    name = re.sub(r'[^\w.]', '', name)

    s = hexlify(rand_bytes(8))

    return '-'.join((name, compact_date(time()), s))

def gen_root_id():

    """Return a new tree-root file id."""

    return gen_file_id('TREE_ROOT')

class TreeEntry(object):

    """An entry that implements the minium interface used by commands.

    This needs further inspection, it may be better to have 

    InventoryEntries without ids - though that seems wrong. For now,

    this is a parallel hierarchy to InventoryEntry, and needs to become

    one of several things: decorates to that hierarchy, children of, or

    parents of it.

    Another note is that these objects are currently only used when there is

    no InventoryEntry available - i.e. for unversioned objects.

    Perhaps they should be UnversionedEntry et al. ? - RBC 20051003

    """

    def __eq__(self, other):

        # yes, this us ugly, TODO: best practice __eq__ style.

        return (isinstance(other, TreeEntry)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return "???"

class TreeDirectory(TreeEntry):

    """See TreeEntry. This is a directory in a working tree."""

    def __eq__(self, other):

        return (isinstance(other, TreeDirectory)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return "/"

class TreeFile(TreeEntry):

    """See TreeEntry. This is a regular file in a working tree."""

    def __eq__(self, other):

        return (isinstance(other, TreeFile)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return ''

class TreeLink(TreeEntry):

    """See TreeEntry. This is a symlink in a working tree."""

    def __eq__(self, other):

        return (isinstance(other, TreeLink)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return ''

class WorkingTree(bzrlib.tree.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='.', branch=None):

        """Construct a WorkingTree for basedir.

        If the branch is not supplied, it is opened automatically.

        If the branch is supplied, it must be the branch for this basedir.

        (branch.base is not cross checked, because for remote branches that

        would be meaningless).

        """

        from bzrlib.hashcache import HashCache

        from bzrlib.trace import note, mutter

        assert isinstance(basedir, basestring), \

            "base directory %r is not a string" % basedir

        if branch is None:

            branch = Branch.open(basedir)

        assert isinstance(branch, Branch), \

            "branch %r is not a Branch" % branch

        self.branch = branch

        self.basedir = realpath(basedir)

        self._set_inventory(self.read_working_inventory())

        # update the whole cache up front and write to disk if anything changed;

        # in the future we might want to do this more selectively

        # two possible ways offer themselves : in self._unlock, write the cache

        # if needed, or, when the cache sees a change, append it to the hash

        # cache file, and have the parser take the most recent entry for a

        # given path only.

        hc = self._hashcache = HashCache(basedir)

        hc.read()

        hc.scan()

        if hc.needs_write:

            mutter("write hc")

            hc.write()

    def _set_inventory(self, inv):

        self._inventory = inv

        self.path2id = self._inventory.path2id

    @staticmethod

    def open_containing(path=None):

        """Open an existing working tree which has its root about path.

        This probes for a working tree at path and searches upwards from there.

        Basically we keep looking up until we find the control directory or

        run into /.  If there isn't one, raises NotBranchError.

        TODO: give this a new exception.

        If there is one, it is returned, along with the unused portion of path.

        """

        if path is None:

            path = os.getcwdu()

        else:

            # sanity check.

            if path.find('://') != -1:

                raise NotBranchError(path=path)

        path = os.path.abspath(path)

        tail = ''

        while True:

            try:

                return WorkingTree(path), tail

            except NotBranchError:

                pass

            if tail:

                tail = os.path.join(os.path.basename(path), tail)

            else:

                tail = os.path.basename(path)

            path = os.path.dirname(path)

            # FIXME: top in windows is indicated how ???

            if path == os.path.sep:

                # reached the root, whatever that may be

                raise NotBranchError(path=path)

    def __iter__(self):

        """Iterate through file_ids for this tree.

        file_ids are in a WorkingTree if they are in the working inventory

        and the working file exists.

        """

        inv = self._inventory

        for path, ie in inv.iter_entries():

            if bzrlib.osutils.lexists(self.abspath(path)):

                yield ie.file_id

    def __repr__(self):

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

                               getattr(self, 'basedir', None))

    def abspath(self, filename):

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

    def relpath(self, abspath):

        """Return the local path portion from a given absolute path."""

        return relpath(self.basedir, abspath)

    def has_filename(self, filename):

        return bzrlib.osutils.lexists(self.abspath(filename))

    def get_file(self, file_id):

        return self.get_file_byname(self.id2path(file_id))

    def get_file_byname(self, filename):

        return file(self.abspath(filename), 'rb')

    def get_root_id(self):

        """Return the id of this trees root"""

        inv = self.read_working_inventory()

        return inv.root.file_id

    def _get_store_filename(self, file_id):

        ## XXX: badly named; this is not in the store at all

        return self.abspath(self.id2path(file_id))

    @needs_write_lock

    def commit(self, *args, **kw):

        from bzrlib.commit import Commit

        Commit().commit(self.branch, *args, **kw)

        self._set_inventory(self.read_working_inventory())

    def id2abspath(self, file_id):

        return self.abspath(self.id2path(file_id))

    def has_id(self, file_id):

        # files that have been deleted are excluded

        inv = self._inventory

        if not inv.has_id(file_id):

            return False

        path = inv.id2path(file_id)

        return bzrlib.osutils.lexists(self.abspath(path))

    def has_or_had_id(self, file_id):

        if file_id == self.inventory.root.file_id:

            return True

        return self.inventory.has_id(file_id)

    __contains__ = has_id

    def get_file_size(self, file_id):

        return os.path.getsize(self.id2abspath(file_id))

    def get_file_sha1(self, file_id):

        path = self._inventory.id2path(file_id)

        return self._hashcache.get_sha1(path)

    def is_executable(self, file_id):

        if os.name == "nt":

            return self._inventory[file_id].executable

        else:

            path = self._inventory.id2path(file_id)

            mode = os.lstat(self.abspath(path)).st_mode

            return bool(stat.S_ISREG(mode) and stat.S_IEXEC&mode)

    @needs_write_lock

    def add(self, files, ids=None):

        """Make files versioned.

        Note that the command line normally calls smart_add instead,

        which can automatically recurse.

        This adds the files to the inventory, so that they will be

        recorded by the next commit.

        files

            List of paths to add, relative to the base of the tree.

        ids

            If set, use these instead of automatically generated ids.

            Must be the same length as the list of files, but may

            contain None for ids that are to be autogenerated.

        TODO: Perhaps have an option to add the ids even if the files do

              not (yet) exist.

        TODO: Perhaps callback with the ids and paths as they're added.

        """

        # TODO: Re-adding a file that is removed in the working copy

        # should probably put it back with the previous ID.

        if isinstance(files, basestring):

            assert(ids is None or isinstance(ids, basestring))

            files = [files]

            if ids is not None:

                ids = [ids]

        if ids is None:

            ids = [None] * len(files)

        else:

            assert(len(ids) == len(files))

        inv = self.read_working_inventory()

        for f,file_id in zip(files, ids):

            if is_control_file(f):

                raise BzrError("cannot add control file %s" % quotefn(f))

            fp = splitpath(f)

            if len(fp) == 0:

                raise BzrError("cannot add top-level %r" % f)

            fullpath = os.path.normpath(self.abspath(f))

            try:

                kind = file_kind(fullpath)

            except OSError:

                # maybe something better?

                raise BzrError('cannot add: not a regular file, symlink or directory: %s' % quotefn(f))

            if not InventoryEntry.versionable_kind(kind):

                raise BzrError('cannot add: not a versionable file ('

                               'i.e. regular file, symlink or directory): %s' % quotefn(f))

            if file_id is None:

                file_id = gen_file_id(f)

            inv.add_path(f, kind=kind, file_id=file_id)

            mutter("add file %s file_id:{%s} kind=%r" % (f, file_id, kind))

        self._write_inventory(inv)

    @needs_write_lock

    def add_pending_merge(self, *revision_ids):

        # TODO: Perhaps should check at this point that the

        # history of the revision is actually present?

        p = self.pending_merges()

        updated = False

        for rev_id in revision_ids:

            if rev_id in p:

                continue

            p.append(rev_id)

            updated = True

        if updated:

            self.set_pending_merges(p)

    def pending_merges(self):

        """Return a list of pending merges.

        These are revisions that have been merged into the working

        directory but not yet committed.

        """

        cfn = self.branch._rel_controlfilename('pending-merges')

        if not self.branch._transport.has(cfn):

            return []

        p = []

        for l in self.branch.controlfile('pending-merges', 'r').readlines():

            p.append(l.rstrip('\n'))

        return p

    @needs_write_lock

    def set_pending_merges(self, rev_list):

        self.branch.put_controlfile('pending-merges', '\n'.join(rev_list))

    def get_symlink_target(self, file_id):

        return os.readlink(self.id2abspath(file_id))

    def file_class(self, filename):

        if self.path2id(filename):

            return 'V'

        elif self.is_ignored(filename):

            return 'I'

        else:

            return '?'

    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_relpath, from_dir_id, dp):

            ls = os.listdir(dp)

            ls.sort()

            for f in ls:

                ## TODO: If we find a subdirectory with its own .bzr

                ## directory, then that is a separate tree and we

                ## should exclude it.

                if bzrlib.BZRDIR == f:

                    continue

                # path within tree

                fp = appendpath(from_dir_relpath, 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:

                        raise BzrCheckError("file %r entered as kind %r id %r, "

                                            "now of kind %r"

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

                # make a last minute entry

                if f_ie:

                    entry = f_ie

                else:

                    if fk == 'directory':

                        entry = TreeDirectory()

                    elif fk == 'file':

                        entry = TreeFile()

                    elif fk == 'symlink':

                        entry = TreeLink()

                    else:

                        entry = TreeEntry()

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

                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('', inv.root.file_id, self.basedir):

            yield f

    @needs_write_lock

    def move(self, from_paths, to_name):

        """Rename files.

        to_name must exist in the inventory.

        If to_name exists and is a directory, the files are moved into

        it, keeping their old names.  

        Note that to_name is only the last component of the new name;

        this doesn't change the directory.

        This returns a list of (from_path, to_path) pairs for each

        entry that is moved.

        """

        result = []

        ## TODO: Option to move IDs only

        assert not isinstance(from_paths, basestring)

        inv = self.inventory

        to_abs = self.abspath(to_name)

        if not isdir(to_abs):

            raise BzrError("destination %r is not a directory" % to_abs)

        if not self.has_filename(to_name):

            raise BzrError("destination %r not in working directory" % to_abs)

        to_dir_id = inv.path2id(to_name)

        if to_dir_id == None and to_name != '':

            raise BzrError("destination %r is not a versioned directory" % to_name)

        to_dir_ie = inv[to_dir_id]

        if to_dir_ie.kind not in ('directory', 'root_directory'):

            raise BzrError("destination %r is not a directory" % to_abs)

        to_idpath = inv.get_idpath(to_dir_id)

        for f in from_paths:

            if not self.has_filename(f):

                raise BzrError("%r does not exist in working tree" % f)

            f_id = inv.path2id(f)

            if f_id == None:

                raise BzrError("%r is not versioned" % f)

            name_tail = splitpath(f)[-1]

            dest_path = appendpath(to_name, name_tail)

            if self.has_filename(dest_path):

                raise BzrError("destination %r already exists" % dest_path)

            if f_id in to_idpath:

                raise BzrError("can't move %r to a subdirectory of itself" % f)

        # OK, so there's a race here, it's possible that someone will

        # create a file in this interval and then the rename might be

        # left half-done.  But we should have caught most problems.

        orig_inv = deepcopy(self.inventory)

        try:

            for f in from_paths:

                name_tail = splitpath(f)[-1]

                dest_path = appendpath(to_name, name_tail)

                result.append((f, dest_path))

                inv.rename(inv.path2id(f), to_dir_id, name_tail)

                try:

                    rename(self.abspath(f), self.abspath(dest_path))

                except OSError, e:

                    raise BzrError("failed to rename %r to %r: %s" %

                                   (f, dest_path, e[1]),

                            ["rename rolled back"])

        except:

            # restore the inventory on error

            self._set_inventory(orig_inv)

            raise

        self._write_inventory(inv)

        return result

    @needs_write_lock

    def rename_one(self, from_rel, to_rel):

        """Rename one file.

        This can change the directory or the filename or both.

        """

        inv = self.inventory

        if not self.has_filename(from_rel):

            raise BzrError("can't rename: old working file %r does not exist" % from_rel)

        if self.has_filename(to_rel):

            raise BzrError("can't rename: new working file %r already exists" % to_rel)

        file_id = inv.path2id(from_rel)

        if file_id == None:

            raise BzrError("can't rename: old name %r is not versioned" % from_rel)

        entry = inv[file_id]

        from_parent = entry.parent_id

        from_name = entry.name

        if inv.path2id(to_rel):

            raise BzrError("can't rename: new name %r is already versioned" % to_rel)

        to_dir, to_tail = os.path.split(to_rel)

        to_dir_id = inv.path2id(to_dir)

        if to_dir_id == None and to_dir != '':

            raise BzrError("can't determine destination directory id for %r" % to_dir)

        mutter("rename_one:")

        mutter("  file_id    {%s}" % file_id)

        mutter("  from_rel   %r" % from_rel)

        mutter("  to_rel     %r" % to_rel)

        mutter("  to_dir     %r" % to_dir)

        mutter("  to_dir_id  {%s}" % to_dir_id)

        inv.rename(file_id, to_dir_id, to_tail)

        from_abs = self.abspath(from_rel)

        to_abs = self.abspath(to_rel)

        try:

            rename(from_abs, to_abs)

        except OSError, e:

            inv.rename(file_id, from_parent, from_name)

            raise BzrError("failed to rename %r to %r: %s"

                    % (from_abs, to_abs, e[1]),

                    ["rename rolled back"])

        self._write_inventory(inv)

    @needs_read_lock

    def unknowns(self):

        """Return all unknown files.

        These are files in the working directory that are not versioned or

        control files or ignored.

        >>> from bzrlib.branch import ScratchBranch

        >>> b = ScratchBranch(files=['foo', 'foo~'])

        >>> tree = WorkingTree(b.base, b)

        >>> map(str, tree.unknowns())

        ['foo']

        >>> tree.add('foo')

        >>> list(b.unknowns())

        []

        >>> tree.remove('foo')

        >>> list(b.unknowns())

        [u'foo']

        """

        for subp in self.extras():

            if not self.is_ignored(subp):

                yield subp

    def iter_conflicts(self):

        conflicted = set()

        for path in (s[0] for s in self.list_files()):

            stem = get_conflicted_stem(path)

            if stem is None:

                continue

            if stem not in conflicted:

                conflicted.add(stem)

                yield stem

    @needs_write_lock

    def pull(self, source, overwrite=False):

        from bzrlib.merge import merge_inner

        source.lock_read()

        try:

            old_revision_history = self.branch.revision_history()

            count = self.branch.pull(source, overwrite)

            new_revision_history = self.branch.revision_history()

            if new_revision_history != old_revision_history:

                if len(old_revision_history):

                    other_revision = old_revision_history[-1]

                else:

                    other_revision = None

                merge_inner(self.branch,

                            self.branch.basis_tree(), 

                            self.branch.revision_tree(other_revision))

            return count

        finally:

            source.unlock()

    def extras(self):

        """Yield all 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.

        """

        ## TODO: Work from given directory downwards

        for path, dir_entry in self.inventory.directories():

            mutter("search for unknowns in %r", path)

            dirabs = self.abspath(path)

            if not isdir(dirabs):

                # e.g. directory deleted

                continue

            fl = []

            for subf in os.listdir(dirabs):

                if (subf != '.bzr'

                    and (subf not in dir_entry.children)):

                    fl.append(subf)

            fl.sort()

            for subf in fl:

                subp = appendpath(path, subf)

                yield subp

    def ignored_files(self):

        """Yield list of PATH, IGNORE_PATTERN"""

        for subp in self.extras():

            pat = self.is_ignored(subp)

            if pat != None:

                yield subp, pat

    def get_ignore_list(self):

        """Return list of ignore patterns.

        Cached in the Tree object after the first call.

        """

        if hasattr(self, '_ignorelist'):

            return self._ignorelist

        l = bzrlib.DEFAULT_IGNORE[:]

        if self.has_filename(bzrlib.IGNORE_FILENAME):

            f = self.get_file_byname(bzrlib.IGNORE_FILENAME)

            l.extend([line.rstrip("\n\r") for line in f.readlines()])

        self._ignorelist = l

        return l

    def is_ignored(self, filename):

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

        Patterns containing '/' or '\' need to match the whole path;

        others match against only the last component.

        If the file is ignored, returns the pattern which caused it to

        be ignored, otherwise None.  So this can simply be used as a

        boolean if desired."""

        # TODO: Use '**' to match directories, and other extended

        # globbing stuff from cvs/rsync.

        # XXX: fnmatch is actually not quite what we want: it's only

        # approximately the same as real Unix fnmatch, and doesn't

        # treat dotfiles correctly and allows * to match /.

        # Eventually it should be replaced with something more

        # accurate.

        for pat in self.get_ignore_list():