/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,

    )

from bzrlib.foreign import (

    ForeignRepository,

    )

from bzrlib.plugins.git.commit import (

    GitCommitBuilder,

    )

from bzrlib.plugins.git.inventory import (

    GitInventory,

    )

from bzrlib.plugins.git.mapping import (

    default_mapping,

    foreign_git,

    mapping_registry,

    )

from bzrlib.plugins.git.versionedfiles import (

    GitRevisions,

    GitTexts,

    )

class GitRepository(ForeignRepository):

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

    _serializer = None

    _commit_builder_class = GitCommitBuilder

    vcs = foreign_git

    def __init__(self, gitdir, lockfiles):

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

            lockfiles)

        from bzrlib.plugins.git import fetch, push

        for optimiser in [fetch.InterRemoteGitNonGitRepository, 

                          fetch.InterLocalGitNonGitRepository,

                          fetch.InterGitGitRepository,

                          push.InterToLocalGitRepository,

                          push.InterToRemoteGitRepository]:

            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

    def revision_graph_can_have_wrong_parents(self):

        return False

    def dfetch(self, source, stop_revision):

        interrepo = repository.InterRepository.get(source, self)

        return interrepo.dfetch(stop_revision)

    def dfetch_refs(self, source, stop_revision):

        interrepo = repository.InterRepository.get(source, self)

        return interrepo.dfetch_refs(stop_revision)

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 = None

        self.revisions = GitRevisions(self._git.object_store)

        self.inventories = None

        self.texts = GitTexts(self)

    def all_revision_ids(self):

        ret = set([revision.NULL_REVISION])

        heads = self._git.refs.as_dict('refs/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 _make_parents_provider(self):

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

        return self._parents_provider

    def get_parent_map(self, revids):

        parent_map = {}

        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 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(revid).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._revision_id = revision_id

        self._repository = repository

        store = repository._git.object_store

        assert isinstance(revision_id, str)

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

        try:

            commit = store[git_id]

        except KeyError, r:

            raise errors.NoSuchRevision(repository, revision_id)

        self.tree = commit.tree

        self._inventory = GitInventory(self.tree, self.mapping, store, 

                                       revision_id)

    def get_revision_id(self):

        return self._revision_id

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

        if path is not None:

            entry = self._inventory._get_ie(path)

        else:

            entry = self._inventory[file_id]

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

        return entry.object.data

class GitRepositoryFormat(repository.RepositoryFormat):

    """Git repository format."""

    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 errors.UninitializableFormat(self)

    def check_conversion_target(self, target_repo_format):

        return target_repo_format.rich_root_data

    def network_name(self):

        return "git"