/brz/remove-bazaar

# 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

"""WorkingTree4 format and implementation.

WorkingTree4 provides the dirstate based working tree logic.

To get a WorkingTree, call bzrdir.open_workingtree() or
WorkingTree.open(dir).
"""

import os

from bzrlib.lazy_import import lazy_import
lazy_import(globals(), """
from bisect import bisect_left
import collections
from copy import deepcopy
import errno
import itertools
import operator
import stat
from time import time
import warnings

import bzrlib
from bzrlib import (
    bzrdir,
    conflicts as _mod_conflicts,
    dirstate,
    errors,
    generate_ids,
    globbing,
    hashcache,
    ignores,
    merge,
    osutils,
    textui,
    transform,
    urlutils,
    xml5,
    xml6,
    )
import bzrlib.branch
from bzrlib.transport import get_transport
import bzrlib.ui
""")

from bzrlib import symbol_versioning
from bzrlib.decorators import needs_read_lock, needs_write_lock
from bzrlib.inventory import InventoryEntry, Inventory, ROOT_ID
from bzrlib.lockable_files import LockableFiles, TransportLock
from bzrlib.lockdir import LockDir
import bzrlib.mutabletree
from bzrlib.mutabletree import needs_tree_write_lock
from bzrlib.osutils import (
    compact_date,
    file_kind,
    isdir,
    normpath,
    pathjoin,
    rand_chars,
    realpath,
    safe_unicode,
    splitpath,
    supports_executable,
    )
from bzrlib.trace import mutter, note
from bzrlib.transport.local import LocalTransport
from bzrlib.progress import DummyProgress, ProgressPhase
from bzrlib.revision import NULL_REVISION, CURRENT_REVISION
from bzrlib.rio import RioReader, rio_file, Stanza
from bzrlib.symbol_versioning import (deprecated_passed,
        deprecated_method,
        deprecated_function,
        DEPRECATED_PARAMETER,
        zero_eight,
        zero_eleven,
        zero_thirteen,
        )
from bzrlib.tree import Tree
from bzrlib.workingtree import WorkingTree3, WorkingTreeFormat3


class WorkingTree4(WorkingTree3):
    """This is the Format 4 working tree.

    This differs from WorkingTree3 by:
     - having a consolidated internal dirstate.

    This is new in bzr TODO FIXME SETMEBEFORE MERGE.
    """

    def __init__(self, basedir,
                 branch,
                 _inventory=None,
                 _control_files=None,
                 _format=None,
                 _bzrdir=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).
        """
        self._format = _format
        self.bzrdir = _bzrdir
        from bzrlib.hashcache import HashCache
        from bzrlib.trace import note, mutter
        assert isinstance(basedir, basestring), \
            "base directory %r is not a string" % basedir
        basedir = safe_unicode(basedir)
        mutter("opening working tree %r", basedir)
        self._branch = branch
        assert isinstance(self.branch, bzrlib.branch.Branch), \
            "branch %r is not a Branch" % self.branch
        self.basedir = realpath(basedir)
        # if branch is at our basedir and is a format 6 or less
        # assume all other formats have their own control files.
        assert isinstance(_control_files, LockableFiles), \
            "_control_files must be a LockableFiles, not %r" % _control_files
        self._control_files = _control_files
        # 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.
        cache_filename = self.bzrdir.get_workingtree_transport(None).local_abspath('stat-cache')
        hc = self._hashcache = HashCache(basedir, cache_filename, self._control_files._file_mode)
        hc.read()
        # is this scan needed ? it makes things kinda slow.
        #hc.scan()

        if hc.needs_write:
            mutter("write hc")
            hc.write()

        if _inventory is None:
            self._inventory_is_modified = False
            self.read_working_inventory()
        else:
            # the caller of __init__ has provided an inventory,
            # we assume they know what they are doing - as its only
            # the Format factory and creation methods that are
            # permitted to do this.
            self._set_inventory(_inventory, dirty=False)
        self._dirty = None
        self._parent_revisions = None
        self._dirstate = None

    def current_dirstate(self):
        """Return the current dirstate object. 

        This is not part of the tree interface and only exposed for ease of
        testing.

        :raises errors.NotWriteLocked: when not in a lock. 
            XXX: This should probably be errors.NotLocked.
        """
        if not self._control_files._lock_count:
            raise errors.NotWriteLocked(self)
        if self._dirstate is not None:
            return self._dirstate
        local_path = self.bzrdir.get_workingtree_transport(None
            ).local_abspath('dirstate')
        self._dirstate = dirstate.DirState.on_file(local_path)
        return self._dirstate

    def _new_tree(self):
        """Initialize the state in this tree to be a new tree."""
        self._parent_revisions = [NULL_REVISION]
        self._inventory = Inventory()
        self._dirty = True

    @needs_read_lock
    def revision_tree(self, revision_id):
        """See Tree.revision_tree.

        WorkingTree4 supplies revision_trees for any basis tree.
        """
        dirstate = self.current_dirstate()
        parent_ids = dirstate.get_parent_ids()
        if revision_id not in parent_ids:
            raise errors.NoSuchRevisionInTree(self, revision_id)
        return DirStateRevisionTree(dirstate, revision_id,
            self.branch.repository)

    @needs_write_lock
    def set_parent_ids(self, revision_ids, allow_leftmost_as_ghost=False):
        """Set the parent ids to revision_ids.
        
        See also set_parent_trees. This api will try to retrieve the tree data
        for each element of revision_ids from the trees repository. If you have
        tree data already available, it is more efficient to use
        set_parent_trees rather than set_parent_ids. set_parent_ids is however
        an easier API to use.

        :param revision_ids: The revision_ids to set as the parent ids of this
            working tree. Any of these may be ghosts.
        """
        trees = []
        for revision_id in revision_ids:
            try:
                revtree = self.branch.repository.revision_tree(revision_id)
            except errors.NoSuchRevision:
                revtree = None
            trees.append((revision_id, revtree))
        self.set_parent_trees(trees,
            allow_leftmost_as_ghost=allow_leftmost_as_ghost)

    @needs_write_lock
    def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):
        """Set the parents of the working tree.

        :param parents_list: A list of (revision_id, tree) tuples. 
            If tree is None, then that element is treated as an unreachable
            parent tree - i.e. a ghost.
        """
        dirstate = self.current_dirstate()
        if len(parents_list) > 0:
            if not allow_leftmost_as_ghost and parents_list[0][1] is None:
                raise errors.GhostRevisionUnusableHere(leftmost_id)
        real_trees = []
        ghosts = []
        # convert absent trees to the null tree, which we convert back to 
        # missing on access.
        for rev_id, tree in parents_list:
            if tree is not None:
                real_trees.append((rev_id, tree))
            else:
                real_trees.append((rev_id,
                    self.branch.repository.revision_tree(None)))
                ghosts.append(rev_id)
        dirstate.set_parent_trees(real_trees, ghosts=ghosts)
        self._dirty = True

    def unlock(self):
        """Unlock in format 4 trees needs to write the entire dirstate."""
        if self._control_files._lock_count == 1:
            if self._hashcache.needs_write:
                self._hashcache.write()
            # eventually we should do signature checking during read locks for
            # dirstate updates.
            if self._control_files._lock_mode == 'w':
                if self._dirty:
                    self.flush()
            self._dirstate = None
        # reverse order of locking.
        try:
            return self._control_files.unlock()
        finally:
            self.branch.unlock()

    def flush(self):
        """Write the full dirstate to disk."""
        self.current_dirstate().save()
        

class WorkingTreeFormat4(WorkingTreeFormat3):
    """The first consolidated dirstate working tree format.

    This format:
        - exists within a metadir controlling .bzr
        - includes an explicit version marker for the workingtree control
          files, separate from the BzrDir format
        - modifies the hash cache format
        - is new in bzr TODO FIXME SETBEFOREMERGE
        - uses a LockDir to guard access to it.
    """

    def get_format_string(self):
        """See WorkingTreeFormat.get_format_string()."""
        return "Bazaar Working Tree format 4\n"

    def get_format_description(self):
        """See WorkingTreeFormat.get_format_description()."""
        return "Working tree format 4"

    def initialize(self, a_bzrdir, revision_id=None):
        """See WorkingTreeFormat.initialize().
        
        revision_id allows creating a working tree at a different
        revision than the branch is at.
        """
        if not isinstance(a_bzrdir.transport, LocalTransport):
            raise errors.NotLocalUrl(a_bzrdir.transport.base)
        transport = a_bzrdir.get_workingtree_transport(self)
        control_files = self._open_control_files(a_bzrdir)
        control_files.create_lock()
        control_files.lock_write()
        control_files.put_utf8('format', self.get_format_string())
        branch = a_bzrdir.open_branch()
        if revision_id is None:
            revision_id = branch.last_revision()
        inv = Inventory()
        local_path = transport.local_abspath('dirstate')
        dirstate.DirState.initialize(local_path)
        wt = WorkingTree4(a_bzrdir.root_transport.local_abspath('.'),
                         branch,
                         inv,
                         _format=self,
                         _bzrdir=a_bzrdir,
                         _control_files=control_files)
        wt._new_tree()
        wt.lock_write()
        try:
            wt._write_inventory(inv)
            wt.set_root_id(inv.root.file_id)
            wt.set_last_revision(revision_id)
            transform.build_tree(wt.basis_tree(), wt)
        finally:
            control_files.unlock()
            wt.unlock()
        return wt


    def _open(self, a_bzrdir, control_files):
        """Open the tree itself.
        
        :param a_bzrdir: the dir for the tree.
        :param control_files: the control files for the tree.
        """
        return WorkingTree4(a_bzrdir.root_transport.local_abspath('.'),
                           branch=a_bzrdir.open_branch(),
                           _format=self,
                           _bzrdir=a_bzrdir,
                           _control_files=control_files)


class DirStateRevisionTree(Tree):
    """A revision tree pulling the inventory from a dirstate."""

    def __init__(self, dirstate, revision_id, repository):
        self._dirstate = dirstate
        self._revision_id = revision_id
        self._repository = repository
        self._inventory = None
        self._locked = False

    def _comparison_data(self, entry, path):
        """See Tree._comparison_data."""
        if entry is None:
            return None, False, None
        # trust the entry as RevisionTree does, but this may not be
        # sensible: the entry might not have come from us?
        return entry.kind, entry.executable, None

    def _get_inventory(self):
        if self._inventory is not None:
            return self._inventory
        self._generate_inventory()
        return self._inventory

    inventory = property(_get_inventory,
                         doc="Inventory of this Tree")

    def _generate_inventory(self):
        """Create and set self.inventory from the dirstate object.
        
        This is relatively expensive: we have to walk the entire dirstate.
        Ideally we would not, and instead would """
        assert self._locked, 'cannot generate inventory of an unlocked '\
            'dirstate revision tree'
        assert self._revision_id in self._dirstate.get_parent_ids(), \
            'parent %s has disappeared from %s' % (
            self._revision_id, self._dirstate.get_parent_ids())
        inv = Inventory()
        for line in self._dirstate._iter_rows():
            print line
        self._inventory = inv

    def get_parent_ids(self):
        """The parents of a tree in the dirstate are not cached."""
        return self._repository.get_revision(self._revision_id).parent_ids

    def lock_read(self):
        """Lock the tree for a set of operations."""
        self._locked = True

    def unlock(self):
        """Unlock, freeing any cache memory used during the lock."""
        # outside of a lock, the inventory is suspect: release it.
        self._inventory = None
        self._locked = False