/brz/remove-bazaar

# Copyright (C) 2008 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import os

import tempfile

from bzrlib.bzrdir import (

    BzrDir,

    )

from bzrlib.repository import (

    Repository,

    )

from bzrlib.plugins.git.fetch import (

    import_git_objects,

    BazaarObjectStore,

    )

from bzrlib.plugins.git.mapping import (

    default_mapping,

    )

from bzrlib.plugins.git.object_store import (

    get_object_store

    )

from dulwich.server import (

    Backend,

    )

from dulwich.pack import (

    Pack,

    PackData,

    write_pack_index_v2,

    )

class BzrBackend(Backend):

    def __init__(self, directory):

        self.directory = directory

        self.mapping = default_mapping

    def get_refs(self):

        """ return a dict of all tags and branches in repository (and shas) """

        ret = {}

        repo_dir = BzrDir.open(self.directory)

        repo = repo_dir.open_repository()

        store = get_object_store(repo)

        branch = None

        for branch in repo.find_branches(using=True):

            #FIXME: Look for 'master' or 'trunk' in here, and set HEAD accordingly...

            #FIXME: Need to get branch path relative to its repository and use this instead of nick

            ret["refs/heads/"+branch.nick] = store._lookup_revision_sha1(branch.last_revision())

        if 'HEAD' not in ret and branch:

            ret['HEAD'] = store._lookup_revision_sha1(branch.last_revision())

        return ret

    def apply_pack(self, refs, read):

        """ apply pack from client to current repository """

        fd, path = tempfile.mkstemp(suffix=".pack")

        f = os.fdopen(fd, 'w')

        f.write(read())

        f.close()

        p = PackData(path)

        entries = p.sorted_entries()

        write_pack_index_v2(path[:-5]+".idx", entries, p.calculate_checksum())

        def get_objects():

            pack = Pack(path[:-5])

            for obj in pack.iterobjects():

                yield obj

        target = Repository.open(self.directory)

        target.lock_write()

        try:

            target.start_write_group()

            try:

                import_git_objects(target, self.mapping, iter(get_objects()))

            finally:

                target.commit_write_group()

        finally:

            target.unlock()

        for oldsha, sha, ref in refs:

            if ref[:11] == 'refs/heads/':

                branch_nick = ref[11:]

                try:

                    target_dir = BzrDir.open(self.directory + "/" + branch_nick)

                except:

                    target_dir = BzrDir.create(self.directory + "/" + branch_nick)

                try:

                    target_branch = target_dir.open_branch()

                except:

                    target_branch = target_dir.create_branch()

                rev_id = self.mapping.revision_id_foreign_to_bzr(sha)

                target_branch.generate_revision_history(rev_id)

    def fetch_objects(self, determine_wants, graph_walker, progress):

        """ yield git objects to send to client """

        repo = Repository.open(self.directory)

        # If this is a Git repository, just use the existing fetch_objects implementation.

        if getattr(repo, "fetch_objects", None) is not None:

            return repo.fetch_objects(determine_wants, graph_walker, None, progress)

        wants = determine_wants(self.get_refs())

        repo.lock_read()

        try:

            store = BazaarObjectStore(repo)

            have = store.find_missing_revisions(graph_walker)

            missing_sha1s = store.find_missing_objects(have, wants, progress)

            return self.object_store.iter_shas(missing_sha1s)

        finally:

            repo.unlock()