Changeset - a90f8f33adeb
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Andrew Shadura - 9 years ago 2016-07-14 15:31:29
andrew@shadura.me
pygrack: add missing author and copyright information

This module is based on code from git_http_backend.py,
adapted and integrated by Marcin Kuźmiński.

The protocol request handling comes from Daniel, the
rest of the code seems to come from Marcin.
1 file changed with 27 insertions and 0 deletions:
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kallithea/lib/middleware/pygrack.py
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# -*- coding: utf-8 -*-
 
# 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 3 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, see <http://www.gnu.org/licenses/>.
 
"""
 
kallithea.lib.middleware.pygrack
 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

	
 
Python implementation of git-http-backend's Smart HTTP protocol
 

	
 
Based on original code from git_http_backend.py project.
 

	
 
Copyright (c) 2010 Daniel Dotsenko <dotsa@hotmail.com>
 
Copyright (c) 2012 Marcin Kuzminski <marcin@python-works.com>
 

	
 
This file was forked by the Kallithea project in July 2014.
 
"""
 

	
 
import os
 
import socket
 
import logging
 
import traceback
 

	
 
from webob import Request, Response, exc
 

	
 
import kallithea
 
from kallithea.lib.vcs import subprocessio
 

	
 
log = logging.getLogger(__name__)
 

	
 

	
 
class FileWrapper(object):
 

	
 
    def __init__(self, fd, content_length):
 
        self.fd = fd
 
        self.content_length = content_length
 
        self.remain = content_length
 

	
 
    def read(self, size):
 
        if size <= self.remain:
 
            try:
 
                data = self.fd.read(size)
 
            except socket.error:
 
                raise IOError(self)
 
            self.remain -= size
 
        elif self.remain:
 
            data = self.fd.read(self.remain)
 
            self.remain = 0
 
        else:
 
            data = None
 
        return data
 

	
 
    def __repr__(self):
 
        return '<FileWrapper %s len: %s, read: %s>' % (
 
            self.fd, self.content_length, self.content_length - self.remain
 
        )
 

	
 

	
 
class GitRepository(object):
 
    git_folder_signature = set(['config', 'head', 'info', 'objects', 'refs'])
 
    commands = ['git-upload-pack', 'git-receive-pack']
 

	
 
    def __init__(self, repo_name, content_path, extras):
 
        files = set([f.lower() for f in os.listdir(content_path)])
 
        if  not (self.git_folder_signature.intersection(files)
 
                == self.git_folder_signature):
 
            raise OSError('%s missing git signature' % content_path)
 
        self.content_path = content_path
 
        self.valid_accepts = ['application/x-%s-result' %
 
                              c for c in self.commands]
 
        self.repo_name = repo_name
 
        self.extras = extras
 

	
 
    def _get_fixedpath(self, path):
 
        """
 
        Small fix for repo_path
 

	
 
        :param path:
 
        """
 
        return path.split(self.repo_name, 1)[-1].strip('/')
 

	
 
    def inforefs(self, request, environ):
 
        """
 
        WSGI Response producer for HTTP GET Git Smart
 
        HTTP /info/refs request.
 
        """
 

	
 
        git_command = request.GET.get('service')
 
        if git_command not in self.commands:
 
            log.debug('command %s not allowed', git_command)
 
            return exc.HTTPMethodNotAllowed()
 

	
 
        # note to self:
 
        # please, resist the urge to add '\n' to git capture and increment
 
        # line count by 1.
 
        # The code in Git client not only does NOT need '\n', but actually
 
        # blows up if you sprinkle "flush" (0000) as "0001\n".
 
        # It reads binary, per number of bytes specified.
 
        # if you do add '\n' as part of data, count it.
 
        server_advert = '# service=%s' % git_command
 
        packet_len = str(hex(len(server_advert) + 4)[2:].rjust(4, '0')).lower()
 
        _git_path = kallithea.CONFIG.get('git_path', 'git')
 
        cmd = [_git_path, git_command[4:],
 
               '--stateless-rpc', '--advertise-refs', self.content_path]
 
        log.debug('handling cmd %s', cmd)
 
        try:
 
            out = subprocessio.SubprocessIOChunker(cmd,
 
                starting_values=[packet_len + server_advert + '0000']
 
            )
 
        except EnvironmentError as e:
 
            log.error(traceback.format_exc())
 
            raise exc.HTTPExpectationFailed()
 
        resp = Response()
 
        resp.content_type = 'application/x-%s-advertisement' % str(git_command)
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