/brz/remove-bazaar

# Copyright (C) 2008-2018 Jelmer Vernooij <jelmer@jelmer.uk>

# Copyright (C) 2008 John Carr

# Copyright (C) 2008-2011 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

from __future__ import absolute_import

from dulwich.server import TCPGitServer

import sys

from .. import (

    errors,

    trace,

    )

from ..controldir import (

    ControlDir,

    )

from .mapping import (

    default_mapping,

    decode_git_path,

    )

from .object_store import (

    BazaarObjectStore,

    get_object_store,

    )

from .refs import (

    get_refs_container,

    )

from dulwich.protocol import Protocol

from dulwich.server import (

    Backend,

    BackendRepo,

    ReceivePackHandler,

    UploadPackHandler,

    )

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

        transport = self.transport.clone(decode_git_path(path).lstrip("/"))

        trace.mutter('client opens %r: %r', path, transport)

        return BzrBackendRepo(transport, self.mapping)

class BzrBackendRepo(BackendRepo):

    def __init__(self, transport, mapping):

        self.mapping = mapping

        self.repo_dir = ControlDir.open_from_transport(transport)

        self.repo = self.repo_dir.find_repository()

        self.object_store = get_object_store(self.repo)

        self.refs = get_refs_container(self.repo_dir, self.object_store)

    def get_refs(self):

        with self.object_store.lock_read():

            return self.refs.as_dict()

    def get_peeled(self, name):

        cached = self.refs.get_peeled(name)

        if cached is not None:

            return cached

        return self.object_store.peel_sha(self.refs[name]).id

    def fetch_objects(self, determine_wants, graph_walker, progress,

                      get_tagged=None):

        """Yield git objects to send to client """

        with self.object_store.lock_read():

            wants = determine_wants(self.get_refs())

            have = self.object_store.find_common_revisions(graph_walker)

            if wants is None:

                return

            shallows = getattr(graph_walker, 'shallow', frozenset())

            if isinstance(self.object_store, BazaarObjectStore):

                return self.object_store.generate_pack_contents(

                    have, wants, shallow=shallows,

                    progress=progress, get_tagged=get_tagged, lossy=True)

            else:

                if shallows:

                    return self.object_store.generate_pack_contents(

                        have, wants, shallow=shallows, progress=progress)

                else:

                    return self.object_store.generate_pack_contents(

                        have, wants, progress=progress)

class BzrTCPGitServer(TCPGitServer):

    def handle_error(self, request, client_address):

        trace.log_exception_quietly()

        trace.warning('Exception happened during processing of request '

                      'from %s', client_address)

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

    backend = BzrBackend(transport)

    if host is None:

        host = 'localhost'

    if port:

        server = BzrTCPGitServer(backend, host, port)

    else:

        server = BzrTCPGitServer(backend, host)

    server.serve_forever()

def git_http_hook(branch, method, path):

    from dulwich.web import HTTPGitApplication, HTTPGitRequest, DEFAULT_HANDLERS

    handler = None

    for (smethod, spath) in HTTPGitApplication.services:

        if smethod != method:

            continue

        mat = spath.search(path)

        if mat:

            handler = HTTPGitApplication.services[smethod, spath]

            break

    if handler is None:

        return None

    backend = BzrBackend(branch.user_transport)

    def git_call(environ, start_response):

        req = HTTPGitRequest(environ, start_response, dumb=False,

                             handlers=DEFAULT_HANDLERS)

        return handler(req, backend, mat)

    return git_call

def serve_command(handler_cls, backend, inf=sys.stdin, outf=sys.stdout):

    """Serve a single command.

    This is mostly useful for the implementation of commands used by e.g. git+ssh.

    :param handler_cls: `Handler` class to use for the request

    :param argv: execv-style command-line arguments. Defaults to sys.argv.

    :param backend: `Backend` to use

    :param inf: File-like object to read from, defaults to standard input.

    :param outf: File-like object to write to, defaults to standard output.

    :return: Exit code for use with sys.exit. 0 on success, 1 on failure.

    """

    def send_fn(data):

        outf.write(data)

        outf.flush()

    proto = Protocol(inf.read, send_fn)

    handler = handler_cls(backend, ["/"], proto)

    # FIXME: Catch exceptions and write a single-line summary to outf.

    handler.handle()

    return 0

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

    if not inet:

        raise errors.CommandError(

            "git-receive-pack only works in inetd mode")

    backend = BzrBackend(transport)

    sys.exit(serve_command(ReceivePackHandler, backend=backend))

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

    if not inet:

        raise errors.CommandError(

            "git-receive-pack only works in inetd mode")

    backend = BzrBackend(transport)

    sys.exit(serve_command(UploadPackHandler, backend=backend))