/brz/remove-bazaar

# Copyright (C) 2007 Canonical Ltd

# Copyright (C) 2008-2009 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

"""An adapter between a Git Repository and a Bazaar Branch"""

import bzrlib

from bzrlib import (

    errors,

    graph,

    inventory,

    osutils,

    repository,

    revision,

    revisiontree,

    ui,

    urlutils,

    )

from bzrlib.foreign import (

    ForeignRepository,

    )

from bzrlib.trace import (

    mutter,

    )

from bzrlib.transport import (

    get_transport,

    )

from bzrlib.plugins.git.foreign import (

    versionedfiles,

    )

from bzrlib.plugins.git.mapping import (

    default_mapping,

    inventory_to_tree_and_blobs,

    mapping_registry,

    revision_to_commit,

    )

from bzrlib.plugins.git.versionedfiles import (

    GitTexts,

    )

import dulwich as git

import os

import time

class GitTags(object):

    def __init__(self, tags):

        self._tags = tags

    def __iter__(self):

        return iter(self._tags)

class GitRepository(ForeignRepository):

    """An adapter to git repositories for bzr."""

    _serializer = None

    def __init__(self, gitdir, lockfiles):

        ForeignRepository.__init__(self, GitRepositoryFormat(), gitdir, 

            lockfiles)

        from bzrlib.plugins.git import fetch, push

        for optimiser in [fetch.InterGitRepository, 

                          fetch.InterGitNonGitRepository,

                          push.InterToGitRepository]:

            repository.InterRepository.register_optimiser(optimiser)

    def is_shared(self):

        return True

    def supports_rich_root(self):

        return True

    def _warn_if_deprecated(self):

        # This class isn't deprecated

        pass

    def get_mapping(self):

        return default_mapping

    def make_working_trees(self):

        return True

class LocalGitRepository(GitRepository):

    """Git repository on the file system."""

    def __init__(self, gitdir, lockfiles):

        # FIXME: This also caches negatives. Need to be more careful 

        # about this once we start writing to git

        self._parents_provider = graph.CachingParentsProvider(self)

        GitRepository.__init__(self, gitdir, lockfiles)

        self.base = gitdir.root_transport.base

        self._git = gitdir._git

        self.texts = None

        self.signatures = versionedfiles.VirtualSignatureTexts(self)

        self.revisions = versionedfiles.VirtualRevisionTexts(self)

        self.inventories = versionedfiles.VirtualInventoryTexts(self)

        self.texts = GitTexts(self)

        self.tags = GitTags(self._git.get_tags())

    def all_revision_ids(self):

        ret = set([revision.NULL_REVISION])

        heads = self._git.heads()

        if heads == {}:

            return ret

        bzr_heads = [self.get_mapping().revision_id_foreign_to_bzr(h) for h in heads.itervalues()]

        ret = set(bzr_heads)

        graph = self.get_graph()

        for rev, parents in graph.iter_ancestry(bzr_heads):

            ret.add(rev)

        return ret

    #def get_revision_delta(self, revision_id):

    #    parent_revid = self.get_revision(revision_id).parent_ids[0]

    #    diff = self._git.diff(ids.convert_revision_id_bzr_to_git(parent_revid),

    #                   ids.convert_revision_id_bzr_to_git(revision_id))

    def _make_parents_provider(self):

        """See Repository._make_parents_provider()."""

        return self._parents_provider

    def get_parent_map(self, revids):

        parent_map = {}

        mutter("get_parent_map(%r)", revids)

        for revision_id in revids:

            assert isinstance(revision_id, str)

            if revision_id == revision.NULL_REVISION:

                parent_map[revision_id] = ()

                continue

            hexsha, mapping = self.lookup_git_revid(revision_id)

            commit  = self._git.commit(hexsha)

            if commit is None:

                continue

            else:

                parent_map[revision_id] = [mapping.revision_id_foreign_to_bzr(p) for p in commit.parents]

        return parent_map

    def get_ancestry(self, revision_id, topo_sorted=True):

        """See Repository.get_ancestry().

        """

        if revision_id is None:

            return [None, revision.NULL_REVISION] + self._all_revision_ids()

        assert isinstance(revision_id, str)

        ancestry = []

        graph = self.get_graph()

        for rev, parents in graph.iter_ancestry([revision_id]):

            ancestry.append(rev)

        ancestry.reverse()

        return [None] + ancestry

    def import_revision_gist(self, source, revid, parent_lookup):

        """Import the gist of a revision into this Git repository.

        """

        objects = []

        rev = source.get_revision(revid)

        for sha, object, path in inventory_to_tree_and_blobs(source, None, revid):

            if path == "":

                tree_sha = sha

            objects.append((object, path))

        commit = revision_to_commit(rev, tree_sha, parent_lookup)

        objects.append((commit, None))

        self._git.object_store.add_objects(objects)

        return commit.sha().hexdigest()

    def dfetch(self, source, stop_revision):

        """Import the gist of the ancestry of a particular revision."""

        if stop_revision is None:

            raise NotImplementedError

        revidmap = {}

        gitidmap = {}

        def parent_lookup(revid):

            try:

                return gitidmap[revid]

            except KeyError:

                return self.lookup_git_revid(revid)[0]

        todo = []

        source.lock_write()

        try:

            graph = source.get_graph()

            ancestry = [x for x in source.get_ancestry(stop_revision) if x is not None]

            for revid in graph.iter_topo_order(ancestry):

                if not self.has_revision(revid):

                    todo.append(revid)

            pb = ui.ui_factory.nested_progress_bar()

            try:

                for i, revid in enumerate(todo):

                    pb.update("pushing revisions", i, len(todo))

                    git_commit = self.import_revision_gist(source, revid,

                        parent_lookup)

                    gitidmap[revid] = git_commit

                    git_revid = self.get_mapping().revision_id_foreign_to_bzr(

                        git_commit)

                    revidmap[revid] = git_revid

            finally:

                pb.finished()

            source.fetch(self, revision_id=revidmap[stop_revision])

        finally:

            source.unlock()

        return revidmap

    def get_signature_text(self, revision_id):

        raise errors.NoSuchRevision(self, revision_id)

    def lookup_revision_id(self, revid):

        """Lookup a revision id.

        :param revid: Bazaar revision id.

        :return: Tuple with git revisionid and mapping.

        """

        # Yes, this doesn't really work, but good enough as a stub

        return osutils.sha(rev_id).hexdigest(), self.get_mapping()

    def has_signature_for_revision_id(self, revision_id):

        return False

    def lookup_git_revid(self, bzr_revid):

        try:

            return mapping_registry.revision_id_bzr_to_foreign(bzr_revid)

        except errors.InvalidRevisionId:

            raise errors.NoSuchRevision(self, bzr_revid)

    def get_revision(self, revision_id):

        git_commit_id, mapping = self.lookup_git_revid(revision_id)

        try:

            commit = self._git.commit(git_commit_id)

        except KeyError:

            raise errors.NoSuchRevision(self, revision_id)

        # print "fetched revision:", git_commit_id

        revision = mapping.import_commit(commit)

        assert revision is not None

        return revision

    def has_revision(self, revision_id):

        try:

            self.get_revision(revision_id)

        except errors.NoSuchRevision:

            return False

        else:

            return True

    def get_revisions(self, revids):

        return [self.get_revision(r) for r in revids]

    def revision_trees(self, revids):

        for revid in revids:

            yield self.revision_tree(revid)

    def revision_tree(self, revision_id):

        revision_id = revision.ensure_null(revision_id)

        if revision_id == revision.NULL_REVISION:

            inv = inventory.Inventory(root_id=None)

            inv.revision_id = revision_id

            return revisiontree.RevisionTree(self, inv, revision_id)

        return GitRevisionTree(self, revision_id)

    def get_inventory(self, revision_id):

        assert revision_id != None

        return self.revision_tree(revision_id).inventory

    def set_make_working_trees(self, trees):

        pass

    def fetch_objects(self, determine_wants, graph_walker, resolve_ext_ref,

        progress=None):

        return self._git.fetch_objects(determine_wants, graph_walker, progress)

class GitRevisionTree(revisiontree.RevisionTree):

    def __init__(self, repository, revision_id):

        self._repository = repository

        self.revision_id = revision_id

        assert isinstance(revision_id, str)

        git_id, self.mapping = repository.lookup_git_revid(revision_id)

        try:

            commit = repository._git.commit(git_id)

        except KeyError, r:

            raise errors.NoSuchRevision(repository, revision_id)

        self.tree = commit.tree

        self._inventory = inventory.Inventory(revision_id=revision_id)

        self._inventory.root.revision = revision_id

        self._build_inventory(self.tree, self._inventory.root, "")

    def get_revision_id(self):

        return self.revision_id

    def get_file_text(self, file_id):

        entry = self._inventory[file_id]

        if entry.kind == 'directory': return ""

        return self._repository._git.get_blob(entry.text_id).data

    def _build_inventory(self, tree_id, ie, path):

        assert isinstance(path, str)

        tree = self._repository._git.tree(tree_id)

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

            basename = name.decode("utf-8")

            if path == "":

                child_path = name

            else:

                child_path = urlutils.join(path, name)

            file_id = self.mapping.generate_file_id(child_path)

            entry_kind = (mode & 0700000) / 0100000

            if entry_kind == 0:

                child_ie = inventory.InventoryDirectory(file_id, basename, ie.file_id)

            elif entry_kind == 1:

                file_kind = (mode & 070000) / 010000

                b = self._repository._git.get_blob(hexsha)

                if file_kind == 0:

                    child_ie = inventory.InventoryFile(file_id, basename, ie.file_id)

                    child_ie.text_sha1 = osutils.sha_string(b.data)

                elif file_kind == 2:

                    child_ie = inventory.InventoryLink(file_id, basename, ie.file_id)

                    child_ie.text_sha1 = osutils.sha_string("")

                else:

                    raise AssertionError(

                        "Unknown file kind, perms=%o." % (mode,))

                child_ie.text_id = b.id

                child_ie.text_size = len(b.data)

            else:

                raise AssertionError(

                    "Unknown blob kind, perms=%r." % (mode,))

            fs_mode = mode & 0777

            child_ie.executable = bool(fs_mode & 0111)

            child_ie.revision = self.revision_id

            self._inventory.add(child_ie)

            if entry_kind == 0:

                self._build_inventory(hexsha, child_ie, child_path)

class GitRepositoryFormat(repository.RepositoryFormat):

    supports_tree_reference = False

    rich_root_data = True

    def get_format_description(self):

        return "Git Repository"

    def initialize(self, url, shared=False, _internal=False):

        raise bzr_errors.UninitializableFormat(self)

    def check_conversion_target(self, target_repo_format):

        return target_repo_format.rich_root_data