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Viewing changes to breezy/git/git_remote_helper.py

  • Committer: Jelmer Vernooij
  • Date: 2018-02-18 21:42:57 UTC
  • mto: This revision was merged to the branch mainline in revision 6859.
  • Revision ID: jelmer@jelmer.uk-20180218214257-jpevutp1wa30tz3v
Update TODO to reference Breezy, not Bazaar.

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breezy/git/git_remote_helper.py
1
 
#!/usr/bin/env python3
2
 
# vim: expandtab
3
 
 
4
 
# Copyright (C) 2011-2018 Jelmer Vernooij <jelmer@jelmer.uk>
5
 
 
6
 
# This program is free software; you can redistribute it and/or modify
7
 
# it under the terms of the GNU General Public License as published by
8
 
# the Free Software Foundation; either version 2 of the License, or
9
 
# (at your option) any later version.
10
 
#
11
 
# This program is distributed in the hope that it will be useful,
12
 
# but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
 
# GNU General Public License for more details.
15
 
#
16
 
# You should have received a copy of the GNU General Public License
17
 
# along with this program; if not, write to the Free Software
18
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 
 
20
 
 
21
 
"""Remote helper for git for accessing bzr repositories."""
22
 
 
23
 
CAPABILITIES = ["fetch", "option", "push"]
24
 
 
25
 
import os
26
 
 
27
 
from ..controldir import ControlDir
28
 
from ..errors import NotBranchError, NoRepositoryPresent
29
 
from ..repository import InterRepository
30
 
from ..transport import get_transport_from_path
31
 
 
32
 
from . import (
33
 
    LocalGitProber,
34
 
    )
35
 
from .dir import (
36
 
    BareLocalGitControlDirFormat,
37
 
    LocalGitControlDirFormat,
38
 
    )
39
 
 
40
 
from .object_store import (
41
 
    get_object_store,
42
 
    )
43
 
from .refs import (
44
 
    get_refs_container,
45
 
    ref_to_branch_name,
46
 
    )
47
 
from .repository import (
48
 
    GitRepository,
49
 
    )
50
 
 
51
 
from ..plugins.fastimport import exporter as fastexporter
52
 
 
53
 
try:
54
 
    import fastimport  # noqa: F401
55
 
except ImportError:
56
 
    pass
57
 
else:
58
 
    CAPABILITIES.append("import")
59
 
    CAPABILITIES.append("refspec *:*")
60
 
 
61
 
 
62
 
def open_remote_dir(url):
63
 
    try:
64
 
        return ControlDir.open(url)
65
 
    except NotBranchError:
66
 
        return ControlDir.create(url)
67
 
 
68
 
 
69
 
def fetch(outf, wants, shortname, remote_dir, local_dir):
70
 
    remote_repo = remote_dir.find_repository()
71
 
    local_repo = local_dir.find_repository()
72
 
    inter = InterRepository.get(remote_repo, local_repo)
73
 
    revs = []
74
 
    for (sha1, ref) in wants:
75
 
        revs.append((sha1, None))
76
 
    if (isinstance(remote_repo, GitRepository) and
77
 
            isinstance(local_repo, GitRepository)):
78
 
        lossy = False
79
 
    else:
80
 
        lossy = True
81
 
    inter.fetch_objects(revs, lossy=lossy)
82
 
    outf.write(b"\n")
83
 
 
84
 
 
85
 
def push(outf, wants, shortname, remote_dir, local_dir):
86
 
    for (src_ref, dest_ref) in wants:
87
 
        local_branch = local_dir.open_branch(ref=src_ref)
88
 
        dest_branch_name = ref_to_branch_name(dest_ref)
89
 
        if dest_branch_name == "master":
90
 
            dest_branch_name = None
91
 
        try:
92
 
            remote_branch = remote_dir.open_branch(name=dest_branch_name)
93
 
        except NotBranchError:
94
 
            remote_branch = remote_dir.create_branch(name=dest_branch_name)
95
 
        local_branch.push(remote_branch)
96
 
        outf.write(b"ok %s\n" % dest_ref)
97
 
    outf.write(b"\n")
98
 
 
99
 
 
100
 
class RemoteHelper(object):
101
 
    """Git remote helper."""
102
 
 
103
 
    def __init__(self, local_dir, shortname, remote_dir):
104
 
        self.local_dir = local_dir
105
 
        self.shortname = shortname
106
 
        self.remote_dir = remote_dir
107
 
        self.batchcmd = None
108
 
        self.wants = []
109
 
 
110
 
    def cmd_capabilities(self, outf, argv):
111
 
        outf.write(b"\n".join([c.encode() for c in CAPABILITIES]) + b"\n\n")
112
 
 
113
 
    def cmd_list(self, outf, argv):
114
 
        try:
115
 
            repo = self.remote_dir.find_repository()
116
 
        except NoRepositoryPresent:
117
 
            repo = self.remote_dir.create_repository()
118
 
        object_store = get_object_store(repo)
119
 
        with object_store.lock_read():
120
 
            refs = get_refs_container(self.remote_dir, object_store)
121
 
            for ref, git_sha1 in refs.as_dict().items():
122
 
                ref = ref.replace(b"~", b"_")
123
 
                outf.write(b"%s %s\n" % (git_sha1, ref))
124
 
            outf.write(b"\n")
125
 
 
126
 
    def cmd_option(self, outf, argv):
127
 
        outf.write(b"unsupported\n")
128
 
 
129
 
    def cmd_fetch(self, outf, argv):
130
 
        if self.batchcmd not in (None, "fetch"):
131
 
            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):
136
 
        if self.batchcmd not in (None, "push"):
137
 
            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
 
        if "fastimport" in CAPABILITIES:
143
 
            raise Exception("install fastimport for 'import' command support")
144
 
        ref = argv[1].encode('utf-8')
145
 
        dest_branch_name = ref_to_branch_name(ref)
146
 
        if dest_branch_name == "master":
147
 
            dest_branch_name = None
148
 
        remote_branch = self.remote_dir.open_branch(name=dest_branch_name)
149
 
        exporter = fastexporter.BzrFastExporter(
150
 
            remote_branch, outf=outf, ref=ref, checkpoint=None,
151
 
            import_marks_file=None, export_marks_file=None, revision=None,
152
 
            verbose=None, plain_format=True, rewrite_tags=False)
153
 
        exporter.run()
154
 
 
155
 
    commands = {
156
 
        "capabilities": cmd_capabilities,
157
 
        "list": cmd_list,
158
 
        "option": cmd_option,
159
 
        "fetch": cmd_fetch,
160
 
        "push": cmd_push,
161
 
        "import": cmd_import,
162
 
        }
163
 
 
164
 
    def process(self, inf, outf):
165
 
        while True:
166
 
            line = inf.readline()
167
 
            if not line:
168
 
                break
169
 
            self.process_line(line, outf)
170
 
 
171
 
    def process_line(self, l, outf):
172
 
        argv = l.strip().split()
173
 
        if argv == []:
174
 
            if self.batchcmd == "fetch":
175
 
                fetch(outf, self.wants, self.shortname,
176
 
                      self.remote_dir, self.local_dir)
177
 
            elif self.batchcmd == "push":
178
 
                push(outf, self.wants, self.shortname,
179
 
                     self.remote_dir, self.local_dir)
180
 
            elif self.batchcmd is None:
181
 
                return
182
 
            else:
183
 
                raise AssertionError("invalid batch %r" % self.batchcmd)
184
 
            self.batchcmd = None
185
 
        else:
186
 
            try:
187
 
                self.commands[argv[0].decode()](self, outf, argv)
188
 
            except KeyError:
189
 
                raise Exception("Unknown remote command %r" % argv)
190
 
        outf.flush()
191
 
 
192
 
 
193
 
def open_local_dir():
194
 
    try:
195
 
        git_path = os.environ["GIT_DIR"]
196
 
    except KeyError:
197
 
        git_transport = get_transport_from_path(".")
198
 
        git_format = LocalGitProber().probe_transport(git_transport)
199
 
    else:
200
 
        if git_path.endswith("/.git"):
201
 
            git_format = LocalGitControlDirFormat()
202
 
            git_path = git_path[:-4]
203
 
        else:
204
 
            git_format = BareLocalGitControlDirFormat()
205
 
        git_transport = get_transport_from_path(git_path)
206
 
 
207
 
    return git_format.open(git_transport)