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  • Committer: Robert Collins
  • Date: 2010-05-06 11:08:10 UTC
  • mto: This revision was merged to the branch mainline in revision 5223.
  • Revision ID: robertc@robertcollins.net-20100506110810-h3j07fh5gmw54s25
Cleaner matcher matching revised unlocking protocol.

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breezy/git/refs.py
1
 
# Copyright (C) 2010-2018 Jelmer Vernooij <jelmer@jelmer.uk>
2
 
#
3
 
# This program is free software; you can redistribute it and/or modify
4
 
# it under the terms of the GNU General Public License as published by
5
 
# the Free Software Foundation; either version 2 of the License, or
6
 
# (at your option) any later version.
7
 
#
8
 
# This program is distributed in the hope that it will be useful,
9
 
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11
 
# GNU General Public License for more details.
12
 
#
13
 
# You should have received a copy of the GNU General Public License
14
 
# along with this program; if not, write to the Free Software
15
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16
 
 
17
 
"""Conversion between refs and Bazaar revision pointers."""
18
 
 
19
 
from __future__ import absolute_import
20
 
 
21
 
from dulwich.refs import (
22
 
    ANNOTATED_TAG_SUFFIX,
23
 
    LOCAL_BRANCH_PREFIX,
24
 
    LOCAL_TAG_PREFIX,
25
 
    )
26
 
from dulwich.repo import (
27
 
    RefsContainer,
28
 
    )
29
 
 
30
 
from .. import (
31
 
    errors,
32
 
    osutils,
33
 
    revision as _mod_revision,
34
 
    )
35
 
 
36
 
is_tag = lambda x: x.startswith(LOCAL_TAG_PREFIX)
37
 
is_head = lambda x: x.startswith(LOCAL_BRANCH_PREFIX)
38
 
is_peeled = lambda x: x.endswith(ANNOTATED_TAG_SUFFIX)
39
 
 
40
 
 
41
 
def gather_peeled(refs):
42
 
    ret = {}
43
 
    for k, v in refs.items():
44
 
        if is_peeled(k):
45
 
            continue
46
 
        try:
47
 
            peeled = refs[k+ANNOTATED_TAG_SUFFIX]
48
 
            unpeeled = v
49
 
        except KeyError:
50
 
            peeled = v
51
 
            unpeeled = None
52
 
        ret[k] = (peeled, unpeeled)
53
 
    return ret
54
 
 
55
 
 
56
 
def branch_name_to_ref(name):
57
 
    """Map a branch name to a ref.
58
 
 
59
 
    :param name: Branch name
60
 
    :return: ref string
61
 
    """
62
 
    if name == "":
63
 
        return b"HEAD"
64
 
    if not name.startswith("refs/"):
65
 
        return LOCAL_BRANCH_PREFIX + osutils.safe_utf8(name)
66
 
    else:
67
 
        return osutils.safe_utf8(name)
68
 
 
69
 
 
70
 
def tag_name_to_ref(name):
71
 
    """Map a tag name to a ref.
72
 
 
73
 
    :param name: Tag name
74
 
    :return: ref string
75
 
    """
76
 
    return LOCAL_TAG_PREFIX + osutils.safe_utf8(name)
77
 
 
78
 
 
79
 
def ref_to_branch_name(ref):
80
 
    """Map a ref to a branch name
81
 
 
82
 
    :param ref: Ref
83
 
    :return: A branch name
84
 
    """
85
 
    if ref == b"HEAD":
86
 
        return u""
87
 
    if ref is None:
88
 
        return ref
89
 
    if ref.startswith(LOCAL_BRANCH_PREFIX):
90
 
        return ref[len(LOCAL_BRANCH_PREFIX):].decode('utf-8')
91
 
    raise ValueError("unable to map ref %s back to branch name" % ref)
92
 
 
93
 
 
94
 
def ref_to_tag_name(ref):
95
 
    if ref.startswith(LOCAL_TAG_PREFIX):
96
 
        return ref[len(LOCAL_TAG_PREFIX):].decode("utf-8")
97
 
    raise ValueError("unable to map ref %s back to tag name" % ref)
98
 
 
99
 
 
100
 
class BazaarRefsContainer(RefsContainer):
101
 
 
102
 
    def __init__(self, dir, object_store):
103
 
        self.dir = dir
104
 
        self.object_store = object_store
105
 
 
106
 
    def get_packed_refs(self):
107
 
        return {}
108
 
 
109
 
    def set_symbolic_ref(self, name, other):
110
 
        if name == b"HEAD":
111
 
            pass # FIXME: Switch default branch
112
 
        else:
113
 
            raise NotImplementedError(
114
 
                "Symbolic references not supported for anything other than "
115
 
                "HEAD")
116
 
 
117
 
    def _get_revid_by_tag_name(self, tag_name):
118
 
        for branch in self.dir.list_branches():
119
 
            try:
120
 
                # FIXME: This is ambiguous!
121
 
                return branch.tags.lookup_tag(tag_name)
122
 
            except errors.NoSuchTag:
123
 
                pass
124
 
        return None
125
 
 
126
 
    def _get_revid_by_branch_name(self, branch_name):
127
 
        try:
128
 
            branch = self.dir.open_branch(branch_name)
129
 
        except errors.NoColocatedBranchSupport:
130
 
            if branch_name in ("HEAD", "master"):
131
 
                branch = self.dir.open_branch()
132
 
            else:
133
 
                raise
134
 
        return branch.last_revision()
135
 
 
136
 
    def read_loose_ref(self, ref):
137
 
        try:
138
 
            branch_name = ref_to_branch_name(ref)
139
 
        except ValueError:
140
 
            tag_name = ref_to_tag_name(ref)
141
 
            revid = self._get_revid_by_tag_name(tag_name)
142
 
        else:
143
 
            revid = self._get_revid_by_branch_name(branch_name)
144
 
        if revid == _mod_revision.NULL_REVISION:
145
 
            return None
146
 
        # FIXME: Unpeel if necessary
147
 
        with self.object_store.lock_read():
148
 
            return self.object_store._lookup_revision_sha1(revid)
149
 
 
150
 
    def get_peeled(self, ref):
151
 
        return self.read_loose_ref(ref)
152
 
 
153
 
    def allkeys(self):
154
 
        keys = set()
155
 
        for branch in self.dir.list_branches():
156
 
            repo = branch.repository
157
 
            if repo.has_revision(branch.last_revision()):
158
 
                ref = branch_name_to_ref(getattr(branch, "name", ""))
159
 
                keys.add(ref)
160
 
            try:
161
 
                for tag_name, revid in branch.tags.get_tag_dict().items():
162
 
                    if repo.has_revision(revid):
163
 
                        keys.add(tag_name_to_ref(tag_name))
164
 
            except errors.TagsNotSupported:
165
 
                pass
166
 
        return keys
167
 
 
168
 
    def __delitem__(self, ref):
169
 
        try:
170
 
            branch_name = ref_to_branch_name(ref)
171
 
        except ValueError:
172
 
            return # FIXME: Cope with tags!
173
 
        self.dir.destroy_branch(branch_name)
174
 
 
175
 
    def __setitem__(self, ref, sha):
176
 
        try:
177
 
            branch_name = ref_to_branch_name(ref)
178
 
        except ValueError:
179
 
            # FIXME: Cope with tags!
180
 
            return
181
 
        try:
182
 
            target_branch = self.repo_dir.open_branch(branch_name)
183
 
        except errors.NotBranchError:
184
 
            target_branch = self.repo.create_branch(branch_name)
185
 
 
186
 
        rev_id = self.mapping.revision_id_foreign_to_bzr(sha)
187
 
        with target_branch.lock_write():
188
 
            target_branch.generate_revision_history(rev_id)
189
 
 
190
 
 
191
 
def get_refs_container(controldir, object_store):
192
 
    fn = getattr(controldir, "get_refs_container", None)
193
 
    if fn is not None:
194
 
        return fn()
195
 
    return BazaarRefsContainer(controldir, object_store)
196
 
 
197
 
 
198
 
def remote_refs_dict_to_tag_refs(refs_dict):
199
 
    base = {}
200
 
    peeled = {}
201
 
    for k, v in refs_dict.items():
202
 
        if is_peeled(k):
203
 
            peeled[k[:-3]] = v
204
 
        else:
205
 
            base[k] = v
206
 
            peeled[k] = v
207
 
    all_keys = set().union(base.keys(), peeled.keys())
208
 
    for n in all_keys:
209
 
        try:
210
 
            tag_name = ref_to_tag_name(n)
211
 
        except ValueError:
212
 
            continue
213
 
        yield (n, tag_name, peeled.get(n), base.get(n))