/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,

    BzrDirFormat,

    )

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,

    BackendRepo,

    )

from dulwich.pack import (

    PackData,

    write_pack_index_v2,

    )

from dulwich.objects import (

    ShaFile,

    hex_to_sha,

    )

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):

        return BzrBackendRepo(self.transport.clone(path), 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_refs(self):

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

        ret = {}

        branch = None

        for branch in self.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] = self.object_store._lookup_revision_sha1(branch.last_revision())

        if 'HEAD' not in ret and branch:

            ret['HEAD'] = self.object_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()

        heads = []

        for e in entries:

            sha = e[0]

            offset = e[1]

            t, o = p.get_object_at (offset)

            if t == 1 or t == 4:

                heads.append(sha)

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

        repo_dir = BzrDir.open_from_transport(self.transport)

        target = repo_dir.find_repository()

        objects = {}

        for tup in p.iterobjects():

            obj_type, obj = p.get_object_at (tup[0])

            if obj_type in range(1, 4):

                sf = ShaFile.from_raw_string (obj_type, obj)

                objects[hex_to_sha(sf.id)] = sf

        target.lock_write()

        try:

            target.start_write_group()

            try:

                import_git_objects(target, self.mapping, objects,

                                   BazaarObjectStore (target, self.mapping),

                                   heads)

            except:

                target.abort_write_group()

                raise

            else:

                target.commit_write_group()

        finally:

            target.unlock()

        for oldsha, sha, ref in refs:

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

                branch_nick = ref[11:]

                transport = self.transport.clone(branch_nick)

                try:

                    target_dir = BzrDir.open_from_transport(transport)

                except:

                    format = BzrDirFormat.get_default_format()

                    format.initialize_on_transport(transport)

                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 """

        bzrdir = BzrDir.open_from_transport(self.transport)

        repo = bzrdir.find_repository()

        # 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)[0]

        wants = determine_wants(self.get_refs())

        graph_walker.reset()

        repo.lock_read()

        store = BazaarObjectStore(repo)

        have = store.find_common_revisions(graph_walker)

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

        return store.iter_shas(missing_sha1s)

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()