/brz/remove-bazaar

# Copyright (C) 2008 Jelmer Vernooij

# Copyright (C) 2008 John Carr

# 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 dulwich.server import TCPGitServer

from bzrlib.bzrdir import (

    BzrDir,

    )

from bzrlib.errors import (

    NotBranchError,

    )

from bzrlib.plugins.git.branch import (

    branch_name_to_ref,

    ref_to_branch_name,

    )

from bzrlib.plugins.git.fetch import (

    import_git_objects,

    )

from bzrlib.plugins.git.mapping import (

    default_mapping,

    )

from bzrlib.plugins.git.object_store import (

    get_object_store

    )

from dulwich.server import (

    Backend,

    BackendRepo,

    )

from dulwich.pack import (

    PackData,

    Pack,

    )

class BzrBackend(Backend):

    """A git serve backend that can use a Bazaar repository."""

    def __init__(self, transport):

        self.transport = transport

        self.mapping = default_mapping

    def open_repository(self, path):

        # FIXME: More secure path sanitization

        return BzrBackendRepo(self.transport.clone(path.lstrip("/")),

            self.mapping)

class BzrBackendRepo(BackendRepo):

    def __init__(self, transport, mapping):

        self.transport = transport

        self.mapping = mapping

        self.repo_dir = BzrDir.open_from_transport(self.transport)

        self.repo = self.repo_dir.find_repository()

        self.object_store = get_object_store(self.repo)

    def get_peeled(self, name):

        return self.get_refs()[name]

    def get_refs(self):

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

        ret = {}

        self.repo.lock_read()

        try:

            for branch in self.repo_dir.list_branches():

                ref = branch_name_to_ref(branch.name, "refs/heads/master")

                ret[ref] = self.object_store._lookup_revision_sha1(

                    branch.last_revision())

                assert type(ref) == str and type(ret[ref]) == str, \

                        "(%s) %r -> %r" % (branch.name, ref, ret[ref])

        finally:

            self.repo.unlock()

        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()

        pd = PackData(path)

        pd.create_index_v2(path[:-5]+".idx", self.object_store.get_raw)

        p = Pack(path[:-5])

        heads = [k[1] for k in refs]

        self.repo.lock_write()

        try:

            self.repo.start_write_group()

            try:

                import_git_objects(self.repo, self.mapping, 

                    p.iterobjects(get_raw=self.object_store.get_raw),

                    self.object_store, heads)

            except:

                self.repo.abort_write_group()

                raise

            else:

                self.repo.commit_write_group()

        finally:

            self.repo.unlock()

        for oldsha, sha, ref in refs:

            try:

                branch_name = ref_to_branch_name(ref)

            except ValueError:

                # FIXME: Cope with tags!

                continue

            try:

                target_branch = self.repo_dir.open_branch(branch_name)

            except NotBranchError:

                target_branch = self.repo.create_branch(branch_name)

            rev_id = self.mapping.revision_id_foreign_to_bzr(sha)

            target_branch.lock_write()

            try:

                target_branch.generate_revision_history(rev_id)

            finally:

                target_branch.unlock()

    def fetch_objects(self, determine_wants, graph_walker, progress,

        get_tagged=None):

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

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

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

            return self.repo.fetch_objects(determine_wants, graph_walker, None, progress)[0]

        wants = determine_wants(self.get_refs())

        graph_walker.reset()

        self.repo.lock_read()

        try:

            have = self.object_store.find_common_revisions(graph_walker)

            return self.object_store.generate_pack_contents(have, wants)

        finally:

            self.repo.unlock()

def serve_git(transport, host=None, port=None, inet=False):

    backend = BzrBackend(transport)

    if host is None:

        host = 'localhost'

    if port:

        server = TCPGitServer(backend, host, port)

    else:

        server = TCPGitServer(backend, host)

    server.serve_forever()