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# server.py -- Implementation of the server side git protocols
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# Copryight (C) 2008 John Carr <john.carr@unrouted.co.uk>
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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from dulwich.protocol import Protocol, ProtocolFile, TCP_GIT_PORT, extract_capabilities
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from dulwich.repo import Repo
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from dulwich.pack import PackData, Pack, write_pack_data
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import os, sha, tempfile
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class Backend(object):
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Get all the refs in the repository
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:return: dict of name -> sha
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raise NotImplementedError
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def apply_pack(self, refs, read):
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""" Import a set of changes into a repository and update the refs
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:param refs: list of tuple(name, sha)
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:param read: callback to read from the incoming pack
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raise NotImplementedError
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def fetch_objects(self, determine_wants, graph_walker, progress):
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Yield the objects required for a list of commits.
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:param progress: is a callback to send progress messages to the client
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raise NotImplementedError
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class GitBackend(Backend):
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def __init__(self, gitdir=None):
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self.gitdir = tempfile.mkdtemp()
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Repo.create(self.gitdir)
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self.repo = Repo(self.gitdir)
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self.fetch_objects = self.repo.fetch_objects
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self.get_refs = self.repo.get_refs
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def apply_pack(self, refs, read):
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# store the incoming pack in the repository
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fd, name = tempfile.mkstemp(suffix='.pack', prefix='pack-', dir=self.repo.pack_dir())
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# strip '.pack' off our filename
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# generate an index for it
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pd.create_index_v2(basename+".idx")
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for oldsha, sha, ref in refs:
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self.repo.remove_ref(ref)
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self.repo.set_ref(ref, sha)
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class Handler(object):
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def __init__(self, backend, read, write):
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self.backend = backend
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self.proto = Protocol(read, write)
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def capabilities(self):
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return " ".join(self.default_capabilities())
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class UploadPackHandler(Handler):
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def default_capabilities(self):
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return ("multi_ack", "side-band-64k", "thin-pack", "ofs-delta")
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def determine_wants(heads):
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self.proto.write_pkt_line("%s %s\x00%s\n" % ( heads[keys[0]], keys[0], self.capabilities()))
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self.proto.write_pkt_line("%s %s\n" % (heads[k], k))
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self.proto.write("0000")
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# Now client will either send "0000", meaning that it doesnt want to pull.
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# or it will start sending want want want commands
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want = self.proto.read_pkt_line()
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want, self.client_capabilities = extract_capabilities(want)
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while want and want[:4] == 'want':
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want_revs.append(want[5:45])
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want = self.proto.read_pkt_line()
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progress = lambda x: self.proto.write_sideband(2, x)
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write = lambda x: self.proto.write_sideband(1, x)
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class ProtocolGraphWalker(object):
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def __init__(self, proto):
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self._last_sha = None
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def ack(self, have_ref):
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self.proto.write_pkt_line("ACK %s continue\n" % have_ref)
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have = self.proto.read_pkt_line()
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if have[:4] == 'have':
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#if have[:4] == 'done':
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# Oddness: Git seems to resend the last ACK, without the "continue" statement
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self.proto.write_pkt_line("ACK %s\n" % self._last_sha)
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# The exchange finishes with a NAK
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self.proto.write_pkt_line("NAK\n")
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graph_walker = ProtocolGraphWalker(self.proto)
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objects = list(self.backend.fetch_objects(determine_wants, graph_walker, progress))
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progress("dul-daemon says what\n")
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progress("counting objects: %d, done.\n" % len(objects))
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write_pack_data(ProtocolFile(None, write), objects, len(objects))
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progress("how was that, then?\n")
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self.proto.write("0000")
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class ReceivePackHandler(Handler):
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def default_capabilities(self):
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return ("report-status", "delete-refs")
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refs = self.backend.get_refs().items()
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self.proto.write_pkt_line("%s %s\x00%s\n" % (refs[0][1], refs[0][0], self.capabilities()))
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for i in range(1, len(refs)):
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self.proto.write_pkt_line("%s %s\n" % (ref[1], ref[0]))
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self.proto.write_pkt_line("0000000000000000000000000000000000000000 capabilities^{} %s" % self.capabilities())
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self.proto.write("0000")
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ref = self.proto.read_pkt_line()
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# if ref is none then client doesnt want to send us anything..
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ref, client_capabilities = extract_capabilities(ref)
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# client will now send us a list of (oldsha, newsha, ref)
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client_refs.append(ref.split())
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ref = self.proto.read_pkt_line()
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# backend can now deal with this refs and read a pack using self.read
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self.backend.apply_pack(client_refs, self.proto.read)
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# when we have read all the pack from the client, it assumes everything worked OK
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# there is NO ack from the server before it reports victory.
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class TCPGitRequestHandler(SocketServer.StreamRequestHandler):
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proto = Protocol(self.rfile.read, self.wfile.write)
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command, args = proto.read_cmd()
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# switch case to handle the specific git command
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if command == 'git-upload-pack':
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cls = UploadPackHandler
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elif command == 'git-receive-pack':
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cls = ReceivePackHandler
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h = cls(self.server.backend, self.rfile.read, self.wfile.write)
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class TCPGitServer(SocketServer.TCPServer):
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allow_reuse_address = True
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serve = SocketServer.TCPServer.serve_forever
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def __init__(self, backend, listen_addr, port=TCP_GIT_PORT):
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self.backend = backend
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SocketServer.TCPServer.__init__(self, (listen_addr, port), TCPGitRequestHandler)