/brz/remove-bazaar

# Copyright (C) 2009 Jelmer Vernooij <jelmer@samba.org>

#

# 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

"""Git Trees."""

from dulwich.object_store import tree_lookup_path

import stat

import posixpath

from bzrlib import (

    delta,

    errors,

    inventory,

    osutils,

    revisiontree,

    tree,

    )

from bzrlib.plugins.git.mapping import (

    mode_is_executable,

    mode_kind,

    )

class GitRevisionTree(revisiontree.RevisionTree):

    """Revision tree implementation based on Git objects."""

    def __init__(self, repository, revision_id):

        self._revision_id = revision_id

        self._repository = repository

        self.store = repository._git.object_store

        assert isinstance(revision_id, str)

        self.commit_id, self.mapping = repository.lookup_bzr_revision_id(revision_id)

        try:

            commit = self.store[self.commit_id]

        except KeyError, r:

            raise errors.NoSuchRevision(repository, revision_id)

        self.tree = commit.tree

        self._fileid_map = self.mapping.get_fileid_map(self.store.__getitem__, self.tree)

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

        if path is None:

            path = self.id2path(file_id)

        change_scanner = self._repository._file_change_scanner

        (path, commit_id) = change_scanner.find_last_change_revision(path,

            self.commit_id)

        return self._repository.lookup_foreign_revision_id(commit_id, self.mapping)

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

        revid = self.get_file_revision(file_id, path)

        try:

            rev = self._repository.get_revision(revid)

        except errors.NoSuchRevision:

            raise errors.FileTimestampUnavailable(path)

        return rev.timestamp

    def id2path(self, file_id):

        return self._fileid_map.lookup_path(file_id)

    def path2id(self, path):

        if self.mapping.is_special_file(path):

            return None

        return self._fileid_map.lookup_file_id(path.encode('utf-8'))

    def all_file_ids(self):

        return set(self._fileid_map.all_file_ids())

    def get_root_id(self):

        return self.path2id("")

    def has_or_had_id(self, file_id):

        return self.has_id(file_id)

    def has_id(self, file_id):

        try:

            path = self.id2path(file_id)

        except errors.NoSuchId:

            return False

        return self.has_filename(path)

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

        if path is None:

            path = self.id2path(file_id)

        try:

            (mode, hexsha) = tree_lookup_path(self.store.__getitem__, self.tree,

                path)

        except KeyError:

            raise errors.NoSuchId(self, file_id)

        if mode is None:

            # the tree root is a directory

            return "directory"

        return mode_kind(mode)

    def has_filename(self, path):

        try:

            tree_lookup_path(self.store.__getitem__, self.tree,

                path.encode("utf-8"))

        except KeyError:

            return False

        else:

            return True

    def list_files(self, include_root=False, from_dir=None, recursive=True):

        if from_dir is None:

            from_dir = u""

        (mode, hexsha) = tree_lookup_path(self.store.__getitem__, self.tree,

            from_dir.encode("utf-8"))

        if mode is None: # Root

            root_ie = self._get_dir_ie("", None)

        else:

            parent_path = posixpath.dirname(from_dir.encode("utf-8"))

            parent_id = self._fileid_map.lookup_file_id(parent_path)

            if mode_kind(mode) == 'directory':

                root_ie = self._get_dir_ie(from_dir.encode("utf-8"), parent_id)

            else:

                root_ie = self._get_file_ie(from_dir.encode("utf-8"),

                    posixpath.basename(from_dir), mode, hexsha)

        if from_dir != "" or include_root:

            yield (from_dir, "V", root_ie.kind, root_ie.file_id, root_ie)

        todo = set()

        if root_ie.kind == 'directory':

            todo.add((from_dir.encode("utf-8"), hexsha, root_ie.file_id))

        while todo:

            (path, hexsha, parent_id) = todo.pop()

            tree = self.store[hexsha]

            for name, mode, hexsha in tree.iteritems():

                if self.mapping.is_special_file(name):

                    continue

                child_path = posixpath.join(path, name)

                if stat.S_ISDIR(mode):

                    ie = self._get_dir_ie(child_path, parent_id)

                    if recursive:

                        todo.add((child_path, hexsha, ie.file_id))

                else:

                    ie = self._get_file_ie(child_path, name, mode, hexsha, parent_id)

                yield child_path, "V", ie.kind, ie.file_id, ie

    def _get_file_ie(self, path, name, mode, hexsha, parent_id):

        kind = mode_kind(mode)

        file_id = self._fileid_map.lookup_file_id(path)

        ie = inventory.entry_factory[kind](file_id, name.decode("utf-8"), parent_id)

        if kind == 'symlink':

            ie.symlink_target = self.store[hexsha].data

        elif kind == 'tree-reference':

            ie.reference_revision = self.mapping.revision_id_foreign_to_bzr(hexsha)

        else:

            data = self.store[hexsha].data

            ie.text_sha1 = osutils.sha_string(data)

            ie.text_size = len(data)

            ie.executable = mode_is_executable(mode)

        return ie

    def _get_dir_ie(self, path, parent_id):

        file_id = self._fileid_map.lookup_file_id(path)

        return inventory.InventoryDirectory(file_id,

            posixpath.basename(path).decode("utf-8"), parent_id)

    def iter_entries_by_dir(self, specific_file_ids=None, yield_parents=False):

        # FIXME: Support yield parents

        if specific_file_ids is not None:

            specific_paths = [self.id2path(file_id) for file_id in specific_file_ids]

            if specific_paths in ([u""], []):

                specific_paths = None

            else:

                specific_paths = set(specific_paths)

        else:

            specific_paths = None

        todo = set([("", self.tree, None)])

        while todo:

            path, tree_sha, parent_id = todo.pop()

            ie = self._get_dir_ie(path, parent_id)

            if specific_paths is None or path in specific_paths:

                yield path, ie

            tree = self.store[tree_sha]

            for name, mode, hexsha  in tree.iteritems():

                if self.mapping.is_special_file(name):

                    continue

                child_path = posixpath.join(path, name)

                if stat.S_ISDIR(mode):

                    if (specific_paths is None or

                        any(filter(lambda p: p.startswith(child_path), specific_paths))):

                        todo.add((child_path, hexsha, ie.file_id))

                elif specific_paths is None or child_path in specific_paths:

                    yield (child_path,

                            self._get_file_ie(child_path, name, mode, hexsha,

                           ie.file_id))

    def get_revision_id(self):

        """See RevisionTree.get_revision_id."""

        return self._revision_id

    def get_file_sha1(self, file_id, path=None, stat_value=None):

        return osutils.sha_string(self.get_file_text(file_id, path))

    def get_file_verifier(self, file_id, path=None, stat_value=None):

        if path is None:

            path = self.id2path(file_id)

        (mode, hexsha) = tree_lookup_path(self.store.__getitem__, self.tree,

            path)

        return ("GIT", hexsha)

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

        """See RevisionTree.get_file_text."""

        if path is None:

            path = self.id2path(file_id)

        (mode, hexsha) = tree_lookup_path(self.store.__getitem__, self.tree, path)

        if stat.S_ISREG(mode):

            return self.store[hexsha].data

        else:

            return ""

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

        """See RevisionTree.get_symlink_target."""

        if path is None:

            path = self.id2path(file_id)

        (mode, hexsha) = tree_lookup_path(self.store.__getitem__, self.tree, path)

        if stat.S_ISLNK(mode):

            return self.store[hexsha].data

        else:

            return None

    def _comparison_data(self, entry, path):

        if entry is None:

            return None, False, None

        return entry.kind, entry.executable, None

    def path_content_summary(self, path):

        """See Tree.path_content_summary."""

        try:

            (mode, hexsha) = tree_lookup_path(self.store.__getitem__, self.tree, path)

        except KeyError:

            return ('missing', None, None, None)

        kind = mode_kind(mode)

        if kind == 'file':

            executable = mode_is_executable(mode)

            contents = self.store[hexsha].data

            return (kind, len(contents), executable, osutils.sha_string(contents))

        elif kind == 'symlink':

            return (kind, None, None, self.store[hexsha].data)

        else:

            return (kind, None, None, None)

def tree_delta_from_git_changes(changes, mapping,

        (old_fileid_map, new_fileid_map), specific_file=None,

        require_versioned=False):

    """Create a TreeDelta from two git trees.

    source and target are iterators over tuples with:

        (filename, sha, mode)

    """

    ret = delta.TreeDelta()

    for (oldpath, newpath), (oldmode, newmode), (oldsha, newsha) in changes:

        if mapping.is_control_file(oldpath):

            oldpath = None

        if mapping.is_control_file(newpath):

            newpath = None

        if oldpath is None and newpath is None:

            continue

        if oldpath is None:

            file_id = new_fileid_map.lookup_file_id(newpath.encode("utf-8"))

            ret.added.append((newpath, file_id, mode_kind(newmode)))

        elif newpath is None:

            file_id = old_fileid_map.lookup_file_id(oldpath.encode("utf-8"))

            ret.removed.append((oldpath, file_id, mode_kind(oldmode)))

        elif oldpath != newpath:

            file_id = old_fileid_map.lookup_file_id(oldpath.encode("utf-8"))

            ret.renamed.append((oldpath, newpath, file_id, mode_kind(newmode), (oldsha != newsha), (oldmode != newmode)))

        elif mode_kind(oldmode) != mode_kind(newmode):

            file_id = new_fileid_map.lookup_file_id(newpath.encode("utf-8"))

            ret.kind_changed.append((newpath, file_id, mode_kind(oldmode), mode_kind(newmode)))

        elif oldsha != newsha or oldmode != newmode:

            file_id = new_fileid_map.lookup_file_id(newpath.encode("utf-8"))

            ret.modified.append((newpath, file_id, mode_kind(newmode), (oldsha != newsha), (oldmode != newmode)))

        else:

            file_id = new_fileid_map.lookup_file_id(newpath.encode("utf-8"))

            ret.unchanged.append((newpath, file_id, mode_kind(newmode)))

    return ret

def changes_from_git_changes(changes, mapping, specific_file=None,

                                require_versioned=False):

    """Create a iter_changes-like generator from a git stream.

    source and target are iterators over tuples with:

        (filename, sha, mode)

    """

    for (oldpath, newpath), (oldmode, newmode), (oldsha, newsha) in changes:

        path = (oldpath, newpath)

        if mapping.is_special_file(oldpath) or mapping.is_special_file(newpath):

            continue

        if oldpath is None:

            fileid = mapping.generate_file_id(newpath)

            oldexe = None

            oldkind = None

            oldname = None

            oldparent = None

        else:

            oldpath = oldpath.decode("utf-8")

            assert oldmode is not None

            oldexe = mode_is_executable(oldmode)

            oldkind = mode_kind(oldmode)

            try:

                (oldparentpath, oldname) = oldpath.rsplit("/", 1)

            except ValueError:

                oldparent = None

                oldname = oldpath

            else:

                oldparent = mapping.generate_file_id(oldparentpath)

            fileid = mapping.generate_file_id(oldpath)

        if newpath is None:

            newexe = None

            newkind = None

            newname = None

            newparent = None

        else:

            newpath = newpath.decode("utf-8")

            assert newmode is not None

            if newmode is not None:

                newexe = mode_is_executable(newmode)

                newkind = mode_kind(newmode)

            else:

                newexe = False

                newkind = None

            try:

                newparentpath, newname = newpath.rsplit("/", 1)

            except ValueError:

                newparent = None

                newname = newpath

            else:

                newparent = mapping.generate_file_id(newparentpath)

        yield (fileid, (oldpath, newpath), (oldsha != newsha),

             (oldpath is not None, newpath is not None),

             (oldparent, newparent), (oldname, newname),

             (oldkind, newkind), (oldexe, newexe))

class InterGitRevisionTrees(tree.InterTree):

    """InterTree that works between two git revision trees."""

    _matching_from_tree_format = None

    _matching_to_tree_format = None

    _test_mutable_trees_to_test_trees = None

    @classmethod

    def is_compatible(cls, source, target):

        return (isinstance(source, GitRevisionTree) and

                isinstance(target, GitRevisionTree))

    def compare(self, want_unchanged=False, specific_files=None,

                extra_trees=None, require_versioned=False, include_root=False,

                want_unversioned=False):

        if self.source._repository._git.object_store != self.target._repository._git.object_store:

            raise AssertionError

        changes = self.source._repository._git.object_store.tree_changes(

            self.source.tree, self.target.tree, want_unchanged=want_unchanged)

        source_fileid_map = self.source.mapping.get_fileid_map(

            self.source._repository._git.object_store.__getitem__,

            self.source.tree)

        target_fileid_map = self.target.mapping.get_fileid_map(

            self.target._repository._git.object_store.__getitem__,

            self.target.tree)

        return tree_delta_from_git_changes(changes, self.target.mapping,

            (source_fileid_map, target_fileid_map),

            specific_file=specific_files)

    def iter_changes(self, include_unchanged=False, specific_files=None,

        pb=None, extra_trees=[], require_versioned=True,

        want_unversioned=False):

        if self.source._repository._git.object_store != self.target._repository._git.object_store:

            raise AssertionError

        changes = self.source._repository._git.object_store.tree_changes(

            self.source.tree, self.target.tree,

            want_unchanged=include_unchanged)

        return changes_from_git_changes(changes, self.target.mapping,

            specific_file=specific_files)

tree.InterTree.register_optimiser(InterGitRevisionTrees)