/brz/remove-bazaar

# Copyright (C) 2009-2010 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

"""Push implementation that simply prints message saying push is not supported."""

from bzrlib import (

    errors,

    ui,

    )

from bzrlib.graph import (

    PendingAncestryResult,

    )

from bzrlib.repository import (

    InterRepository,

    )

from bzrlib.revision import (

    NULL_REVISION,

    )

from bzrlib.plugins.git.errors import (

    NoPushSupport,

    )

from bzrlib.plugins.git.object_store import (

    BazaarObjectStore,

    )

from bzrlib.plugins.git.repository import (

    GitRepository,

    LocalGitRepository,

    GitRepositoryFormat,

    )

from bzrlib.plugins.git.remote import (

    RemoteGitRepository,

    )

class MissingObjectsIterator(object):

    """Iterate over git objects that are missing from a target repository.

    """

    def __init__(self, store, source, pb=None):

        """Create a new missing objects iterator.

        """

        self.source = source

        self._object_store = store

        self._pending = []

        self.pb = pb

    def import_revisions(self, revids, roundtrip):

        """Import a set of revisions into this git repository.

        :param revids: Revision ids of revisions to import

        :param roundtrip: Whether to roundtrip bzr metadata

        """

        for i, revid in enumerate(revids):

            if self.pb:

                self.pb.update("pushing revisions", i, len(revids))

            git_commit = self.import_revision(revid, roundtrip)

            yield (revid, git_commit)

    def import_revision(self, revid, roundtrip):

        """Import a revision into this Git repository.

        :param revid: Revision id of the revision

        :param roundtrip: Whether to roundtrip bzr metadata

        """

        tree = self._object_store.tree_cache.revision_tree(revid)

        rev = self.source.get_revision(revid)

        commit = None

        for path, obj, ie in self._object_store._revision_to_objects(rev, tree,

            roundtrip):

            if obj.type_name == "commit":

                commit = obj

            self._pending.append((obj, path))

        return commit.id

    def __len__(self):

        return len(self._pending)

    def __iter__(self):

        return iter(self._pending)

class InterToGitRepository(InterRepository):

    """InterRepository that copies into a Git repository."""

    _matching_repo_format = GitRepositoryFormat()

    def __init__(self, source, target):

        super(InterToGitRepository, self).__init__(source, target)

        self.mapping = self.target.get_mapping()

        self.source_store = BazaarObjectStore(self.source, self.mapping)

    @staticmethod

    def _get_repo_format_to_test():

        return None

    def copy_content(self, revision_id=None, pb=None):

        """See InterRepository.copy_content."""

        self.fetch(revision_id, pb, find_ghosts=False)

    def dfetch_refs(self, update_refs):

        """Fetch non-roundtripped revisions into the target repository.

        :param update_refs: Generate refs to fetch. Receives dictionary 

            with old names to old git shas. Should return a dictionary

            of new names to Bazaar revision ids.

        :return: revision id map, old refs dictionary and new refs dictionary

        """

        raise NotImplementedError(self.dfetch_refs)

    def fetch_refs(self, update_refs):

        """Fetch possibly roundtripped revisions into the target repository.

        :param update_refs: Generate refs to fetch. Receives dictionary 

            with old refs (git shas), returns dictionary of new names to 

            git shas.

        :return: old refs, new refs

        """

        raise NotImplementedError(self.fetch_refs)

class InterToLocalGitRepository(InterToGitRepository):

    """InterBranch implementation between a Bazaar and a Git repository."""

    def __init__(self, source, target):

        super(InterToLocalGitRepository, self).__init__(source, target)

        self.target_store = self.target._git.object_store

        self.target_refs = self.target._git.refs

    def _revision_needs_fetching(self, revid):

        if revid == NULL_REVISION:

            return False

        try:

            sha_id = self.source_store._lookup_revision_sha1(revid)

        except KeyError:

            raise errors.NoSuchRevision(self.source, revid)

        try:

            return (sha_id not in self.target_store)

        except errors.NoSuchRevision:

            # Ghost, can't push

            return False

    def missing_revisions(self, stop_revisions):

        """Find the revisions that are missing from the target repository.

        :param stop_revisions: Revisions to check for

        :return: sequence of missing revisions, in topological order

        :raise: NoSuchRevision if the stop_revisions are not present in

            the source

        """

        missing = []

        graph = self.source.get_graph()

        pb = ui.ui_factory.nested_progress_bar()

        try:

            for revid, _ in graph.iter_ancestry(stop_revisions):

                assert type(revid) is str

                pb.update("determining revisions to fetch", len(missing))

                if self._revision_needs_fetching(revid):

                    missing.append(revid)

        finally:

            pb.finished()

        return graph.iter_topo_order(missing)

    def _get_target_bzr_refs(self):

        """Return a dictionary with references.

        :return: Dictionary with reference names as keys and tuples

            with Git SHA, Bazaar revid as values.

        """

        bzr_refs = {}

        refs = self.target._git.get_refs()

        for k, v in refs.iteritems():

            try:

                (kind, (revid, treesha)) = self.source_store.lookup_git_sha(v)

            except KeyError:

                revid = None

            bzr_refs[k] = (v, revid)

        return bzr_refs

    def fetch_refs(self, update_refs):

        self.source.lock_read()

        try:

            old_refs = self._get_target_bzr_refs()

            new_refs = update_refs(old_refs)

            # FIXME: Keep track of already looked up revid<->sha mappings

            fetch_spec = PendingAncestryResult(

                [revid for sha, revid in new_refs.values()], self.source)

            self.fetch(fetch_spec=fetch_spec)

        finally:

            self.source.unlock()

        return old_refs, new_refs

    def dfetch_refs(self, update_refs):

        self.source.lock_read()

        try:

            old_refs = self._get_target_bzr_refs()

            new_refs = update_refs(old_refs)

            revidmap, gitidmap = self.dfetch(new_refs.values())

            for name, (gitid, revid) in new_refs.iteritems():

                if gitid is None:

                    try:

                        gitid = gitidmap[revid]

                    except KeyError:

                        gitid = self.source_store._lookup_revision_sha1(revid)

                self.target._git.refs[name] = gitid

                new_refs[name] = (gitid, self.source_store.lookup_git_sha(gitid)[1][0])

        finally:

            self.source.unlock()

        return revidmap, old_refs, new_refs

    def _get_missing_objects_iterator(self, pb):

        return MissingObjectsIterator(self.source_store, self.source, pb)

    def dfetch(self, stop_revisions):

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

        gitidmap = {}

        revidmap = {}

        self.source.lock_read()

        try:

            todo = list(self.missing_revisions([revid for sha, revid in stop_revisions]))

            pb = ui.ui_factory.nested_progress_bar()

            try:

                object_generator = self._get_missing_objects_iterator(pb)

                for old_bzr_revid, git_commit in object_generator.import_revisions(

                    todo, roundtrip=False):

                    new_bzr_revid = self.mapping.revision_id_foreign_to_bzr(git_commit)

                    revidmap[old_bzr_revid] = new_bzr_revid

                    gitidmap[old_bzr_revid] = git_commit

                self.target_store.add_objects(object_generator)

            finally:

                pb.finished()

        finally:

            self.source.unlock()

        return revidmap, gitidmap

    def fetch(self, revision_id=None, pb=None, find_ghosts=False,

            fetch_spec=None):

        if revision_id is not None:

            stop_revisions = [revision_id]

        elif fetch_spec is not None:

            stop_revisions = fetch_spec.heads

        else:

            stop_revisions = self.source.all_revision_ids()

        self.source.lock_read()

        try:

            todo = list(self.missing_revisions(stop_revisions))

            pb = ui.ui_factory.nested_progress_bar()

            try:

                object_generator = self._get_missing_objects_iterator(pb)

                for (revid, git_sha) in object_generator.import_revisions(

                    todo, roundtrip=True):

                    try:

                        self.mapping.revision_id_bzr_to_foreign(revid)

                    except errors.InvalidRevisionId:

                        self.target_refs[self.mapping.revid_as_refname(revid)] = git_sha

                self.target_store.add_objects(object_generator)

            finally:

                pb.finished()

        finally:

            self.source.unlock()

    @staticmethod

    def is_compatible(source, target):

        """Be compatible with GitRepository."""

        return (not isinstance(source, GitRepository) and

                isinstance(target, LocalGitRepository))

class InterToRemoteGitRepository(InterToGitRepository):

    def dfetch_refs(self, update_refs):

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

        revidmap = {}

        def determine_wants(old_refs):

            ret = {}

            self.old_refs = old_refs

            self.new_refs = update_refs(self.old_refs)

            for name, (gitid, revid) in self.new_refs.iteritems():

                if gitid is None:

                    ret[name] = self.source_store._lookup_revision_sha1(revid)

                else:

                    ret[name] = gitid

            return ret

        self.source.lock_read()

        try:

            new_refs = self.target.send_pack(determine_wants,

                    self.source_store.generate_lossy_pack_contents)

        finally:

            self.source.unlock()

        return revidmap, self.old_refs, self.new_refs

    def fetch_refs(self, update_refs):

        raise NoPushSupport()

    @staticmethod

    def is_compatible(source, target):

        """Be compatible with GitRepository."""

        return (not isinstance(source, GitRepository) and

                isinstance(target, RemoteGitRepository))