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Viewing changes to breezy/git/refs.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/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 dulwich.refs import (
20
 
    ANNOTATED_TAG_SUFFIX,
21
 
    LOCAL_BRANCH_PREFIX,
22
 
    LOCAL_TAG_PREFIX,
23
 
    )
24
 
from dulwich.repo import (
25
 
    RefsContainer,
26
 
    )
27
 
 
28
 
from .. import (
29
 
    errors,
30
 
    osutils,
31
 
    revision as _mod_revision,
32
 
    )
33
 
 
34
 
 
35
 
def is_tag(x):
36
 
    return x.startswith(LOCAL_TAG_PREFIX)
37
 
 
38
 
 
39
 
def is_head(x):
40
 
    return x.startswith(LOCAL_BRANCH_PREFIX)
41
 
 
42
 
 
43
 
def is_peeled(x):
44
 
    return x.endswith(ANNOTATED_TAG_SUFFIX)
45
 
 
46
 
 
47
 
def gather_peeled(refs):
48
 
    ret = {}
49
 
    for k, v in refs.items():
50
 
        if is_peeled(k):
51
 
            continue
52
 
        try:
53
 
            peeled = refs[k + ANNOTATED_TAG_SUFFIX]
54
 
            unpeeled = v
55
 
        except KeyError:
56
 
            peeled = v
57
 
            unpeeled = None
58
 
        ret[k] = (peeled, unpeeled)
59
 
    return ret
60
 
 
61
 
 
62
 
def branch_name_to_ref(name):
63
 
    """Map a branch name to a ref.
64
 
 
65
 
    :param name: Branch name
66
 
    :return: ref string
67
 
    """
68
 
    if name == "":
69
 
        return b"HEAD"
70
 
    if not name.startswith("refs/"):
71
 
        return LOCAL_BRANCH_PREFIX + osutils.safe_utf8(name)
72
 
    else:
73
 
        return osutils.safe_utf8(name)
74
 
 
75
 
 
76
 
def tag_name_to_ref(name):
77
 
    """Map a tag name to a ref.
78
 
 
79
 
    :param name: Tag name
80
 
    :return: ref string
81
 
    """
82
 
    return LOCAL_TAG_PREFIX + osutils.safe_utf8(name)
83
 
 
84
 
 
85
 
def ref_to_branch_name(ref):
86
 
    """Map a ref to a branch name
87
 
 
88
 
    :param ref: Ref
89
 
    :return: A branch name
90
 
    """
91
 
    if ref == b"HEAD":
92
 
        return u""
93
 
    if ref is None:
94
 
        return ref
95
 
    if ref.startswith(LOCAL_BRANCH_PREFIX):
96
 
        return ref[len(LOCAL_BRANCH_PREFIX):].decode('utf-8')
97
 
    raise ValueError("unable to map ref %s back to branch name" % ref)
98
 
 
99
 
 
100
 
def ref_to_tag_name(ref):
101
 
    if ref.startswith(LOCAL_TAG_PREFIX):
102
 
        return ref[len(LOCAL_TAG_PREFIX):].decode("utf-8")
103
 
    raise ValueError("unable to map ref %s back to tag name" % ref)
104
 
 
105
 
 
106
 
class BazaarRefsContainer(RefsContainer):
107
 
 
108
 
    def __init__(self, dir, object_store):
109
 
        self.dir = dir
110
 
        self.object_store = object_store
111
 
 
112
 
    def get_packed_refs(self):
113
 
        return {}
114
 
 
115
 
    def set_symbolic_ref(self, name, other):
116
 
        if name == b"HEAD":
117
 
            pass  # FIXME: Switch default branch
118
 
        else:
119
 
            raise NotImplementedError(
120
 
                "Symbolic references not supported for anything other than "
121
 
                "HEAD")
122
 
 
123
 
    def _get_revid_by_tag_name(self, tag_name):
124
 
        for branch in self.dir.list_branches():
125
 
            try:
126
 
                # FIXME: This is ambiguous!
127
 
                return branch.tags.lookup_tag(tag_name)
128
 
            except errors.NoSuchTag:
129
 
                pass
130
 
        return None
131
 
 
132
 
    def _get_revid_by_branch_name(self, branch_name):
133
 
        try:
134
 
            branch = self.dir.open_branch(branch_name)
135
 
        except errors.NoColocatedBranchSupport:
136
 
            if branch_name in ("HEAD", "master"):
137
 
                branch = self.dir.open_branch()
138
 
            else:
139
 
                raise
140
 
        return branch.last_revision()
141
 
 
142
 
    def read_loose_ref(self, ref):
143
 
        try:
144
 
            branch_name = ref_to_branch_name(ref)
145
 
        except ValueError:
146
 
            tag_name = ref_to_tag_name(ref)
147
 
            revid = self._get_revid_by_tag_name(tag_name)
148
 
        else:
149
 
            revid = self._get_revid_by_branch_name(branch_name)
150
 
        if revid == _mod_revision.NULL_REVISION:
151
 
            return None
152
 
        # FIXME: Unpeel if necessary
153
 
        with self.object_store.lock_read():
154
 
            return self.object_store._lookup_revision_sha1(revid)
155
 
 
156
 
    def get_peeled(self, ref):
157
 
        return self.read_loose_ref(ref)
158
 
 
159
 
    def allkeys(self):
160
 
        keys = set()
161
 
        for branch in self.dir.list_branches():
162
 
            repo = branch.repository
163
 
            if repo.has_revision(branch.last_revision()):
164
 
                ref = branch_name_to_ref(getattr(branch, "name", ""))
165
 
                keys.add(ref)
166
 
            try:
167
 
                for tag_name, revid in branch.tags.get_tag_dict().items():
168
 
                    if repo.has_revision(revid):
169
 
                        keys.add(tag_name_to_ref(tag_name))
170
 
            except errors.TagsNotSupported:
171
 
                pass
172
 
        return keys
173
 
 
174
 
    def __delitem__(self, ref):
175
 
        try:
176
 
            branch_name = ref_to_branch_name(ref)
177
 
        except ValueError:
178
 
            return  # FIXME: Cope with tags!
179
 
        self.dir.destroy_branch(branch_name)
180
 
 
181
 
    def __setitem__(self, ref, sha):
182
 
        try:
183
 
            branch_name = ref_to_branch_name(ref)
184
 
        except ValueError:
185
 
            # FIXME: Cope with tags!
186
 
            return
187
 
        try:
188
 
            target_branch = self.repo_dir.open_branch(branch_name)
189
 
        except errors.NotBranchError:
190
 
            target_branch = self.repo.create_branch(branch_name)
191
 
 
192
 
        rev_id = self.mapping.revision_id_foreign_to_bzr(sha)
193
 
        with target_branch.lock_write():
194
 
            target_branch.generate_revision_history(rev_id)
195
 
 
196
 
 
197
 
def get_refs_container(controldir, object_store):
198
 
    fn = getattr(controldir, "get_refs_container", None)
199
 
    if fn is not None:
200
 
        return fn()
201
 
    return BazaarRefsContainer(controldir, object_store)
202
 
 
203
 
 
204
 
def remote_refs_dict_to_tag_refs(refs_dict):
205
 
    base = {}
206
 
    peeled = {}
207
 
    for k, v in refs_dict.items():
208
 
        if is_peeled(k):
209
 
            peeled[k[:-3]] = v
210
 
        else:
211
 
            base[k] = v
212
 
            peeled[k] = v
213
 
    all_keys = set().union(base.keys(), peeled.keys())
214
 
    for n in all_keys:
215
 
        try:
216
 
            tag_name = ref_to_tag_name(n)
217
 
        except ValueError:
218
 
            continue
219
 
        yield (n, tag_name, peeled.get(n), base.get(n))