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git_remote_helper.py
 
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#!/usr/bin/env python
 
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# vim: expandtab
 
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# Copyright (C) 2011 Jelmer Vernooij <jelmer@apache.org>
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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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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#
 
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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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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"""Remote helper for git for accessing bzr repositories."""
 
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CAPABILITIES = ["fetch", "option", "push"]
 
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import os
 
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from bzrlib.controldir import ControlDir
 
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from bzrlib.errors import NotBranchError, NoRepositoryPresent
 
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from bzrlib.repository import InterRepository
 
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from bzrlib.transport import get_transport_from_path
 
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from bzrlib.plugins.git import (
 
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    LocalGitProber,
 
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    )
 
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from bzrlib.plugins.git.dir import (
 
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    BareLocalGitControlDirFormat,
 
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    LocalGitControlDirFormat,
 
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    )
 
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from bzrlib.plugins.git.object_store import (
 
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    get_object_store,
 
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    )
 
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from bzrlib.plugins.git.refs import (
 
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    get_refs_container,
 
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    ref_to_branch_name,
 
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    )
 
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from bzrlib.plugins.git.repository import (
 
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    GitRepository,
 
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    )
 
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try:
 
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    from bzrlib.plugins.fastimport import exporter as fastexporter
 
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except ImportError:
 
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    pass
 
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else:
 
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    CAPABILITIES.append("import")
 
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def open_remote_dir(url):
 
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    try:
 
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        return ControlDir.open(url)
 
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    except NotBranchError:
 
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        return ControlDir.create(url)
 
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def fetch(outf, wants, shortname, remote_dir, local_dir):
 
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    remote_repo = remote_dir.find_repository()
 
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    local_repo = local_dir.find_repository()
 
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    inter = InterRepository.get(remote_repo, local_repo)
 
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    def update_refs(heads):
 
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        ret = {}
 
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        for (sha1, ref) in wants:
 
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            ret[ref] = (sha1, None)
 
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        return ret
 
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    if (isinstance(remote_repo, GitRepository) and
 
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        isinstance(local_repo, GitRepository)):
 
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        lossy = False
 
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    else:
 
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        lossy = True
 
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    inter.fetch_refs(update_refs, lossy=lossy)
 
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    outf.write("\n")
 
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def push(outf, wants, shortname, remote_dir, local_dir):
 
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    for (src_ref, dest_ref) in wants:
 
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        local_branch = local_dir.open_branch(ref=src_ref)
 
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        dest_branch_name = ref_to_branch_name(dest_ref)
 
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        if dest_branch_name == "master":
 
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            dest_branch_name = None
 
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        try:
 
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            remote_branch = remote_dir.open_branch(name=dest_branch_name)
 
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        except NotBranchError:
 
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            remote_branch = remote_dir.create_branch(name=dest_branch_name)
 
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        local_branch.push(remote_branch)
 
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        outf.write("ok %s\n" % dest_ref)
 
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    outf.write("\n")
 
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class RemoteHelper(object):
 
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    """Git remote helper."""
 
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    def __init__(self, local_dir, shortname, remote_dir):
 
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        self.local_dir = local_dir
 
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        self.shortname = shortname
 
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        self.remote_dir = remote_dir
 
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        self.batchcmd = None
 
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        self.wants = []
 
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    def cmd_capabilities(self, outf, argv):
 
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        outf.write("\n".join(CAPABILITIES)+"\n\n")
 
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    def cmd_list(self, outf, argv):
 
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        try:
 
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            repo = self.remote_dir.find_repository()
 
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        except NoRepositoryPresent:
 
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            repo = self.remote_dir.create_repository()
 
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        object_store = get_object_store(repo)
 
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        object_store.lock_read()
 
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        try:
 
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            refs = get_refs_container(self.remote_dir, object_store)
 
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            for ref, git_sha1 in refs.as_dict().iteritems():
 
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                outf.write("%s %s\n" % (git_sha1, ref))
 
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            outf.write("\n")
 
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        finally:
 
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            object_store.unlock()
 
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126
    def cmd_option(self, outf, argv):
 
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        outf.write("unsupported\n")
 
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129
    def cmd_fetch(self, outf, argv):
 
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        if self.batchcmd not in (None, "fetch"):
 
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            raise Exception("fetch command inside other batch command")
 
132
        self.wants.append(tuple(argv[1:]))
 
133
        self.batchcmd = "fetch"
 
134
 
 
135
    def cmd_push(self, outf, argv):
 
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        if self.batchcmd not in (None, "push"):
 
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            raise Exception("push command inside other batch command")
 
138
        self.wants.append(tuple(argv[1].split(":", 1)))
 
139
        self.batchcmd = "push"
 
140
 
 
141
    def cmd_import(self, outf, argv):
 
142
        dest_branch_name = ref_to_branch_name(argv[1])
 
143
        if dest_branch_name == "master":
 
144
            dest_branch_name = None
 
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        remote_branch = self.remote_dir.open_branch(name=dest_branch_name)
 
146
        exporter = fastexporter.BzrFastExporter(remote_branch,
 
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            outf=outf, git_branch=argv[1],
 
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            checkpoint=None, import_marks_file=None,
 
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            export_marks_file=None, revision=None,
 
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            verbose=None, plain_format=True,
 
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            rewrite_tags=False)
 
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        exporter.run()
 
153
 
 
154
    commands = {
 
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        "capabilities": cmd_capabilities,
 
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        "list": cmd_list,
 
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        "option": cmd_option,
 
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        "fetch": cmd_fetch,
 
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        "push": cmd_push,
 
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        "import": cmd_import,
 
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        }
 
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163
    def process(self, inf, outf):
 
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        while True:
 
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            l = inf.readline()
 
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            if not l:
 
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                break
 
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            self.process_line(l, outf)
 
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    def process_line(self, l, outf):
 
171
        argv = l.strip().split()
 
172
        if argv == []:
 
173
            if self.batchcmd == "fetch":
 
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                fetch(outf, self.wants, self.shortname, self.remote_dir, self.local_dir)
 
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            elif self.batchcmd == "push":
 
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                push(outf, self.wants, self.shortname, self.remote_dir, self.local_dir)
 
177
            elif self.batchcmd is None:
 
178
                return
 
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            else:
 
180
                raise AssertionError("invalid batch %r" % self.batchcmd)
 
181
            self.batchcmd = None
 
182
        else:
 
183
            try:
 
184
               self.commands[argv[0]](self, outf, argv)
 
185
            except KeyError:
 
186
               raise Exception("Unknown remote command %r" % argv)
 
187
        outf.flush()
 
188
 
 
189
 
 
190
def open_local_dir():
 
191
    try:
 
192
        git_path = os.environ["GIT_DIR"]
 
193
    except KeyError:
 
194
        git_transport = get_transport_from_path(".")
 
195
        git_format = LocalGitProber().probe_transport(git_transport)
 
196
    else:
 
197
        if git_path.endswith("/.git"):
 
198
            git_format = LocalGitControlDirFormat()
 
199
            git_path = git_path[:-4]
 
200
        else:
 
201
            git_format = BareLocalGitControlDirFormat()
 
202
        git_transport = get_transport_from_path(git_path)
 
203
 
 
204
    return git_format.open(git_transport)