~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006, 2007, 2009, 2010, 2011 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

# TODO: 'bzr resolve' should accept a directory name and work from that

# point down

import os

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

import errno

from bzrlib import (

    cleanup,

    commands,

    errors,

    osutils,

    rio,

    trace,

    transform,

    workingtree,

    )

""")

from bzrlib import (

    option,

    registry,

    )

CONFLICT_SUFFIXES = ('.THIS', '.BASE', '.OTHER')

class cmd_conflicts(commands.Command):

    __doc__ = """List files with conflicts.

    Merge will do its best to combine the changes in two branches, but there

    are some kinds of problems only a human can fix.  When it encounters those,

    it will mark a conflict.  A conflict means that you need to fix something,

    before you should commit.

    Conflicts normally are listed as short, human-readable messages.  If --text

    is supplied, the pathnames of files with text conflicts are listed,

    instead.  (This is useful for editing all files with text conflicts.)

    Use bzr resolve when you have fixed a problem.

    """

    takes_options = [

            'directory',

            option.Option('text',

                          help='List paths of files with text conflicts.'),

        ]

    _see_also = ['resolve', 'conflict-types']

    def run(self, text=False, directory=u'.'):

        wt = workingtree.WorkingTree.open_containing(directory)[0]

        for conflict in wt.conflicts():

            if text:

                if conflict.typestring != 'text conflict':

                    continue

                self.outf.write(conflict.path + '\n')

            else:

                self.outf.write(str(conflict) + '\n')

resolve_action_registry = registry.Registry()

resolve_action_registry.register(

    'done', 'done', 'Marks the conflict as resolved' )

resolve_action_registry.register(

    'take-this', 'take_this',

    'Resolve the conflict preserving the version in the working tree' )

resolve_action_registry.register(

    'take-other', 'take_other',

    'Resolve the conflict taking the merged version into account' )

resolve_action_registry.default_key = 'done'

class ResolveActionOption(option.RegistryOption):

    def __init__(self):

        super(ResolveActionOption, self).__init__(

            'action', 'How to resolve the conflict.',

            value_switches=True,

            registry=resolve_action_registry)

class cmd_resolve(commands.Command):

    __doc__ = """Mark a conflict as resolved.

    Merge will do its best to combine the changes in two branches, but there

    are some kinds of problems only a human can fix.  When it encounters those,

    it will mark a conflict.  A conflict means that you need to fix something,

    before you should commit.

    Once you have fixed a problem, use "bzr resolve" to automatically mark

    text conflicts as fixed, "bzr resolve FILE" to mark a specific conflict as

    resolved, or "bzr resolve --all" to mark all conflicts as resolved.

    """

    aliases = ['resolved']

    takes_args = ['file*']

    takes_options = [

            'directory',

            option.Option('all', help='Resolve all conflicts in this tree.'),

            ResolveActionOption(),

            ]

    _see_also = ['conflicts']

    def run(self, file_list=None, all=False, action=None, directory=None):

        if all:

            if file_list:

                raise errors.BzrCommandError("If --all is specified,"

                                             " no FILE may be provided")

            if directory is None:

                directory = u'.'

            tree = workingtree.WorkingTree.open_containing(directory)[0]

            if action is None:

                action = 'done'

        else:

            tree, file_list = workingtree.WorkingTree.open_containing_paths(

                file_list, directory)

            if file_list is None:

                if action is None:

                    # FIXME: There is a special case here related to the option

                    # handling that could be clearer and easier to discover by

                    # providing an --auto action (bug #344013 and #383396) and

                    # make it mandatory instead of implicit and active only

                    # when no file_list is provided -- vila 091229

                    action = 'auto'

            else:

                if action is None:

                    action = 'done'

        if action == 'auto':

            if file_list is None:

                un_resolved, resolved = tree.auto_resolve()

                if len(un_resolved) > 0:

                    trace.note('%d conflict(s) auto-resolved.', len(resolved))

                    trace.note('Remaining conflicts:')

                    for conflict in un_resolved:

                        trace.note(conflict)

                    return 1

                else:

                    trace.note('All conflicts resolved.')

                    return 0

            else:

                # FIXME: This can never occur but the block above needs some

                # refactoring to transfer tree.auto_resolve() to

                # conflict.auto(tree) --vila 091242

                pass

        else:

            before, after = resolve(tree, file_list, action=action)

            trace.note('%d conflict(s) resolved, %d remaining'

                       % (before - after, after))

def resolve(tree, paths=None, ignore_misses=False, recursive=False,

            action='done'):

    """Resolve some or all of the conflicts in a working tree.

    :param paths: If None, resolve all conflicts.  Otherwise, select only

        specified conflicts.

    :param recursive: If True, then elements of paths which are directories

        have all their children resolved, etc.  When invoked as part of

        recursive commands like revert, this should be True.  For commands

        or applications wishing finer-grained control, like the resolve

        command, this should be False.

    :param ignore_misses: If False, warnings will be printed if the supplied

        paths do not have conflicts.

    :param action: How the conflict should be resolved,

    """

    tree.lock_tree_write()

    nb_conflicts_after = None

    try:

        tree_conflicts = tree.conflicts()

        nb_conflicts_before = len(tree_conflicts)

        if paths is None:

            new_conflicts = ConflictList()

            to_process = tree_conflicts

        else:

            new_conflicts, to_process = tree_conflicts.select_conflicts(

                tree, paths, ignore_misses, recursive)

        for conflict in to_process:

            try:

                conflict._do(action, tree)

                conflict.cleanup(tree)

            except NotImplementedError:

                new_conflicts.append(conflict)

        try:

            nb_conflicts_after = len(new_conflicts)

            tree.set_conflicts(new_conflicts)

        except errors.UnsupportedOperation:

            pass

    finally:

        tree.unlock()

    if nb_conflicts_after is None:

        nb_conflicts_after = nb_conflicts_before

    return nb_conflicts_before, nb_conflicts_after

def restore(filename):

    """Restore a conflicted file to the state it was in before merging.

    Only text restoration is supported at present.

    """

    conflicted = False

    try:

        osutils.rename(filename + ".THIS", filename)

        conflicted = True

    except OSError, e:

        if e.errno != errno.ENOENT:

            raise

    try:

        os.unlink(filename + ".BASE")

        conflicted = True

    except OSError, e:

        if e.errno != errno.ENOENT:

            raise

    try:

        os.unlink(filename + ".OTHER")

        conflicted = True

    except OSError, e:

        if e.errno != errno.ENOENT:

            raise

    if not conflicted:

        raise errors.NotConflicted(filename)

class ConflictList(object):

    """List of conflicts.

    Typically obtained from WorkingTree.conflicts()

    Can be instantiated from stanzas or from Conflict subclasses.

    """

    def __init__(self, conflicts=None):

        object.__init__(self)

        if conflicts is None:

            self.__list = []

        else:

            self.__list = conflicts

    def is_empty(self):

        return len(self.__list) == 0

    def __len__(self):

        return len(self.__list)

    def __iter__(self):

        return iter(self.__list)

    def __getitem__(self, key):

        return self.__list[key]

    def append(self, conflict):

        return self.__list.append(conflict)

    def __eq__(self, other_list):

        return list(self) == list(other_list)

    def __ne__(self, other_list):

        return not (self == other_list)

    def __repr__(self):

        return "ConflictList(%r)" % self.__list

    @staticmethod

    def from_stanzas(stanzas):

        """Produce a new ConflictList from an iterable of stanzas"""

        conflicts = ConflictList()

        for stanza in stanzas:

            conflicts.append(Conflict.factory(**stanza.as_dict()))

        return conflicts

    def to_stanzas(self):

        """Generator of stanzas"""

        for conflict in self:

            yield conflict.as_stanza()

    def to_strings(self):

        """Generate strings for the provided conflicts"""

        for conflict in self:

            yield str(conflict)

    def remove_files(self, tree):

        """Remove the THIS, BASE and OTHER files for listed conflicts"""

        for conflict in self:

            if not conflict.has_files:

                continue

            conflict.cleanup(tree)

    def select_conflicts(self, tree, paths, ignore_misses=False,

                         recurse=False):

        """Select the conflicts associated with paths in a tree.

        File-ids are also used for this.

        :return: a pair of ConflictLists: (not_selected, selected)

        """

        path_set = set(paths)

        ids = {}

        selected_paths = set()

        new_conflicts = ConflictList()

        selected_conflicts = ConflictList()

        for path in paths:

            file_id = tree.path2id(path)

            if file_id is not None:

                ids[file_id] = path

        for conflict in self:

            selected = False

            for key in ('path', 'conflict_path'):

                cpath = getattr(conflict, key, None)

                if cpath is None:

                    continue

                if cpath in path_set:

                    selected = True

                    selected_paths.add(cpath)

                if recurse:

                    if osutils.is_inside_any(path_set, cpath):

                        selected = True

                        selected_paths.add(cpath)

            for key in ('file_id', 'conflict_file_id'):

                cfile_id = getattr(conflict, key, None)

                if cfile_id is None:

                    continue

                try:

                    cpath = ids[cfile_id]

                except KeyError:

                    continue

                selected = True

                selected_paths.add(cpath)

            if selected:

                selected_conflicts.append(conflict)

            else:

                new_conflicts.append(conflict)

        if ignore_misses is not True:

            for path in [p for p in paths if p not in selected_paths]:

                if not os.path.exists(tree.abspath(path)):

                    print "%s does not exist" % path

                else:

                    print "%s is not conflicted" % path

        return new_conflicts, selected_conflicts

class Conflict(object):

    """Base class for all types of conflict"""

    # FIXME: cleanup should take care of that ? -- vila 091229

    has_files = False

    def __init__(self, path, file_id=None):

        self.path = path

        # warn turned off, because the factory blindly transfers the Stanza

        # values to __init__ and Stanza is purely a Unicode api.

        self.file_id = osutils.safe_file_id(file_id, warn=False)

    def as_stanza(self):

        s = rio.Stanza(type=self.typestring, path=self.path)

        if self.file_id is not None:

            # Stanza requires Unicode apis

            s.add('file_id', self.file_id.decode('utf8'))

        return s

    def _cmp_list(self):

        return [type(self), self.path, self.file_id]

    def __cmp__(self, other):

        if getattr(other, "_cmp_list", None) is None:

            return -1

        return cmp(self._cmp_list(), other._cmp_list())

    def __hash__(self):

        return hash((type(self), self.path, self.file_id))

    def __eq__(self, other):

        return self.__cmp__(other) == 0

    def __ne__(self, other):

        return not self.__eq__(other)

    def __str__(self):

        return self.format % self.__dict__

    def __repr__(self):

        rdict = dict(self.__dict__)

        rdict['class'] = self.__class__.__name__

        return self.rformat % rdict

    @staticmethod

    def factory(type, **kwargs):

        global ctype

        return ctype[type](**kwargs)

    @staticmethod

    def sort_key(conflict):

        if conflict.path is not None:

            return conflict.path, conflict.typestring

        elif getattr(conflict, "conflict_path", None) is not None:

            return conflict.conflict_path, conflict.typestring

        else:

            return None, conflict.typestring

    def _do(self, action, tree):

        """Apply the specified action to the conflict.

        :param action: The method name to call.

        :param tree: The tree passed as a parameter to the method.

        """

        meth = getattr(self, 'action_%s' % action, None)

        if meth is None:

            raise NotImplementedError(self.__class__.__name__ + '.' + action)

        meth(tree)

    def associated_filenames(self):

        """The names of the files generated to help resolve the conflict."""

        raise NotImplementedError(self.associated_filenames)

    def cleanup(self, tree):

        for fname in self.associated_filenames():

            try:

                osutils.delete_any(tree.abspath(fname))

            except OSError, e:

                if e.errno != errno.ENOENT:

                    raise

    def action_done(self, tree):

        """Mark the conflict as solved once it has been handled."""

        # This method does nothing but simplifies the design of upper levels.

        pass

    def action_take_this(self, tree):

        raise NotImplementedError(self.action_take_this)

    def action_take_other(self, tree):

        raise NotImplementedError(self.action_take_other)

    def _resolve_with_cleanups(self, tree, *args, **kwargs):

        tt = transform.TreeTransform(tree)

        op = cleanup.OperationWithCleanups(self._resolve)

        op.add_cleanup(tt.finalize)

        op.run_simple(tt, *args, **kwargs)

class PathConflict(Conflict):

    """A conflict was encountered merging file paths"""

    typestring = 'path conflict'

    format = 'Path conflict: %(path)s / %(conflict_path)s'

    rformat = '%(class)s(%(path)r, %(conflict_path)r, %(file_id)r)'

    def __init__(self, path, conflict_path=None, file_id=None):

        Conflict.__init__(self, path, file_id)

        self.conflict_path = conflict_path

    def as_stanza(self):

        s = Conflict.as_stanza(self)

        if self.conflict_path is not None:

            s.add('conflict_path', self.conflict_path)

        return s

    def associated_filenames(self):

        # No additional files have been generated here

        return []

    def _resolve(self, tt, file_id, path, winner):

        """Resolve the conflict.

        :param tt: The TreeTransform where the conflict is resolved.

        :param file_id: The retained file id.

        :param path: The retained path.

        :param winner: 'this' or 'other' indicates which side is the winner.

        """

        path_to_create = None

        if winner == 'this':

            if self.path == '<deleted>':

                return # Nothing to do

            if self.conflict_path == '<deleted>':

                path_to_create = self.path

                revid = tt._tree.get_parent_ids()[0]

        elif winner == 'other':

            if self.conflict_path == '<deleted>':

                return  # Nothing to do

            if self.path == '<deleted>':

                path_to_create = self.conflict_path

                # FIXME: If there are more than two parents we may need to

                # iterate. Taking the last parent is the safer bet in the mean

                # time. -- vila 20100309

                revid = tt._tree.get_parent_ids()[-1]

        else:

            # Programmer error

            raise AssertionError('bad winner: %r' % (winner,))

        if path_to_create is not None:

            tid = tt.trans_id_tree_path(path_to_create)

            transform.create_from_tree(

                tt, tt.trans_id_tree_path(path_to_create),

                self._revision_tree(tt._tree, revid), file_id)

            tt.version_file(file_id, tid)

        # Adjust the path for the retained file id

        tid = tt.trans_id_file_id(file_id)

        parent_tid = tt.get_tree_parent(tid)

        tt.adjust_path(osutils.basename(path), parent_tid, tid)

        tt.apply()

    def _revision_tree(self, tree, revid):

        return tree.branch.repository.revision_tree(revid)

    def _infer_file_id(self, tree):

        # Prior to bug #531967, file_id wasn't always set, there may still be

        # conflict files in the wild so we need to cope with them

        # Establish which path we should use to find back the file-id

        possible_paths = []

        for p in (self.path, self.conflict_path):

            if p == '<deleted>':

                # special hard-coded path 

                continue

            if p is not None:

                possible_paths.append(p)

        # Search the file-id in the parents with any path available

        file_id = None

        for revid in tree.get_parent_ids():

            revtree = self._revision_tree(tree, revid)

            for p in possible_paths:

                file_id = revtree.path2id(p)

                if file_id is not None:

                    return revtree, file_id

        return None, None

    def action_take_this(self, tree):

        if self.file_id is not None:

            self._resolve_with_cleanups(tree, self.file_id, self.path,

                                        winner='this')

        else:

            # Prior to bug #531967 we need to find back the file_id and restore

            # the content from there

            revtree, file_id = self._infer_file_id(tree)

            tree.revert([revtree.id2path(file_id)],

                        old_tree=revtree, backups=False)

    def action_take_other(self, tree):

        if self.file_id is not None:

            self._resolve_with_cleanups(tree, self.file_id,

                                        self.conflict_path,

                                        winner='other')

        else:

            # Prior to bug #531967 we need to find back the file_id and restore

            # the content from there

            revtree, file_id = self._infer_file_id(tree)

            tree.revert([revtree.id2path(file_id)],

                        old_tree=revtree, backups=False)

class ContentsConflict(PathConflict):

    """The files are of different types (or both binary), or not present"""

    has_files = True

    typestring = 'contents conflict'

    format = 'Contents conflict in %(path)s'

    def associated_filenames(self):

        return [self.path + suffix for suffix in ('.BASE', '.OTHER')]

    def _resolve(self, tt, suffix_to_remove):

        """Resolve the conflict.

        :param tt: The TreeTransform where the conflict is resolved.

        :param suffix_to_remove: Either 'THIS' or 'OTHER'

        The resolution is symmetric, when taking THIS, OTHER is deleted and

        item.THIS is renamed into item and vice-versa.

        """

        try:

            # Delete 'item.THIS' or 'item.OTHER' depending on

            # suffix_to_remove

            tt.delete_contents(

                tt.trans_id_tree_path(self.path + '.' + suffix_to_remove))

        except errors.NoSuchFile:

            # There are valid cases where 'item.suffix_to_remove' either

            # never existed or was already deleted (including the case

            # where the user deleted it)

            pass

        # Rename 'item.suffix_to_remove' (note that if

        # 'item.suffix_to_remove' has been deleted, this is a no-op)

        this_tid = tt.trans_id_file_id(self.file_id)

        parent_tid = tt.get_tree_parent(this_tid)

        tt.adjust_path(osutils.basename(self.path), parent_tid, this_tid)

        tt.apply()

    def action_take_this(self, tree):

        self._resolve_with_cleanups(tree, 'OTHER')

    def action_take_other(self, tree):

        self._resolve_with_cleanups(tree, 'THIS')

# TODO: There should be a base revid attribute to better inform the user about

# how the conflicts were generated.

class TextConflict(Conflict):

    """The merge algorithm could not resolve all differences encountered."""

    has_files = True

    typestring = 'text conflict'

    format = 'Text conflict in %(path)s'

    rformat = '%(class)s(%(path)r, %(file_id)r)'

    def associated_filenames(self):

        return [self.path + suffix for suffix in CONFLICT_SUFFIXES]

    def _resolve(self, tt, winner_suffix):

        """Resolve the conflict by copying one of .THIS or .OTHER into file.

        :param tt: The TreeTransform where the conflict is resolved.

        :param winner_suffix: Either 'THIS' or 'OTHER'

        The resolution is symmetric, when taking THIS, item.THIS is renamed

        into item and vice-versa. This takes one of the files as a whole

        ignoring every difference that could have been merged cleanly.

        """

        # To avoid useless copies, we switch item and item.winner_suffix, only

        # item will exist after the conflict has been resolved anyway.

        item_tid = tt.trans_id_file_id(self.file_id)

        item_parent_tid = tt.get_tree_parent(item_tid)

        winner_path = self.path + '.' + winner_suffix

        winner_tid = tt.trans_id_tree_path(winner_path)

        winner_parent_tid = tt.get_tree_parent(winner_tid)

        # Switch the paths to preserve the content

        tt.adjust_path(osutils.basename(self.path),

                       winner_parent_tid, winner_tid)

        tt.adjust_path(osutils.basename(winner_path), item_parent_tid, item_tid)

        # Associate the file_id to the right content

        tt.unversion_file(item_tid)

        tt.version_file(self.file_id, winner_tid)

        tt.apply()

    def action_take_this(self, tree):

        self._resolve_with_cleanups(tree, 'THIS')

    def action_take_other(self, tree):

        self._resolve_with_cleanups(tree, 'OTHER')

class HandledConflict(Conflict):

    """A path problem that has been provisionally resolved.

    This is intended to be a base class.

    """