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  • Committer: Jelmer Vernooij
  • Date: 2020-04-05 19:11:34 UTC
  • mto: (7490.7.16 work)
  • mto: This revision was merged to the branch mainline in revision 7501.
  • Revision ID: jelmer@jelmer.uk-20200405191134-0aebh8ikiwygxma5
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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
 
 
37
def is_tag(x):
 
38
    return x.startswith(LOCAL_TAG_PREFIX)
 
39
 
 
40
 
 
41
def is_head(x):
 
42
    return x.startswith(LOCAL_BRANCH_PREFIX)
 
43
 
 
44
 
 
45
def is_peeled(x):
 
46
    return x.endswith(ANNOTATED_TAG_SUFFIX)
 
47
 
 
48
 
 
49
def gather_peeled(refs):
 
50
    ret = {}
 
51
    for k, v in refs.items():
 
52
        if is_peeled(k):
 
53
            continue
 
54
        try:
 
55
            peeled = refs[k + ANNOTATED_TAG_SUFFIX]
 
56
            unpeeled = v
 
57
        except KeyError:
 
58
            peeled = v
 
59
            unpeeled = None
 
60
        ret[k] = (peeled, unpeeled)
 
61
    return ret
 
62
 
 
63
 
 
64
def branch_name_to_ref(name):
 
65
    """Map a branch name to a ref.
 
66
 
 
67
    :param name: Branch name
 
68
    :return: ref string
 
69
    """
 
70
    if name == "":
 
71
        return b"HEAD"
 
72
    if not name.startswith("refs/"):
 
73
        return LOCAL_BRANCH_PREFIX + osutils.safe_utf8(name)
 
74
    else:
 
75
        return osutils.safe_utf8(name)
 
76
 
 
77
 
 
78
def tag_name_to_ref(name):
 
79
    """Map a tag name to a ref.
 
80
 
 
81
    :param name: Tag name
 
82
    :return: ref string
 
83
    """
 
84
    return LOCAL_TAG_PREFIX + osutils.safe_utf8(name)
 
85
 
 
86
 
 
87
def ref_to_branch_name(ref):
 
88
    """Map a ref to a branch name
 
89
 
 
90
    :param ref: Ref
 
91
    :return: A branch name
 
92
    """
 
93
    if ref == b"HEAD":
 
94
        return u""
 
95
    if ref is None:
 
96
        return ref
 
97
    if ref.startswith(LOCAL_BRANCH_PREFIX):
 
98
        return ref[len(LOCAL_BRANCH_PREFIX):].decode('utf-8')
 
99
    raise ValueError("unable to map ref %s back to branch name" % ref)
 
100
 
 
101
 
 
102
def ref_to_tag_name(ref):
 
103
    if ref.startswith(LOCAL_TAG_PREFIX):
 
104
        return ref[len(LOCAL_TAG_PREFIX):].decode("utf-8")
 
105
    raise ValueError("unable to map ref %s back to tag name" % ref)
 
106
 
 
107
 
 
108
class BazaarRefsContainer(RefsContainer):
 
109
 
 
110
    def __init__(self, dir, object_store):
 
111
        self.dir = dir
 
112
        self.object_store = object_store
 
113
 
 
114
    def get_packed_refs(self):
 
115
        return {}
 
116
 
 
117
    def set_symbolic_ref(self, name, other):
 
118
        if name == b"HEAD":
 
119
            pass  # FIXME: Switch default branch
 
120
        else:
 
121
            raise NotImplementedError(
 
122
                "Symbolic references not supported for anything other than "
 
123
                "HEAD")
 
124
 
 
125
    def _get_revid_by_tag_name(self, tag_name):
 
126
        for branch in self.dir.list_branches():
 
127
            try:
 
128
                # FIXME: This is ambiguous!
 
129
                return branch.tags.lookup_tag(tag_name)
 
130
            except errors.NoSuchTag:
 
131
                pass
 
132
        return None
 
133
 
 
134
    def _get_revid_by_branch_name(self, branch_name):
 
135
        try:
 
136
            branch = self.dir.open_branch(branch_name)
 
137
        except errors.NoColocatedBranchSupport:
 
138
            if branch_name in ("HEAD", "master"):
 
139
                branch = self.dir.open_branch()
 
140
            else:
 
141
                raise
 
142
        return branch.last_revision()
 
143
 
 
144
    def read_loose_ref(self, ref):
 
145
        try:
 
146
            branch_name = ref_to_branch_name(ref)
 
147
        except ValueError:
 
148
            tag_name = ref_to_tag_name(ref)
 
149
            revid = self._get_revid_by_tag_name(tag_name)
 
150
        else:
 
151
            revid = self._get_revid_by_branch_name(branch_name)
 
152
        if revid == _mod_revision.NULL_REVISION:
 
153
            return None
 
154
        # FIXME: Unpeel if necessary
 
155
        with self.object_store.lock_read():
 
156
            return self.object_store._lookup_revision_sha1(revid)
 
157
 
 
158
    def get_peeled(self, ref):
 
159
        return self.read_loose_ref(ref)
 
160
 
 
161
    def allkeys(self):
 
162
        keys = set()
 
163
        for branch in self.dir.list_branches():
 
164
            repo = branch.repository
 
165
            if repo.has_revision(branch.last_revision()):
 
166
                ref = branch_name_to_ref(getattr(branch, "name", ""))
 
167
                keys.add(ref)
 
168
            try:
 
169
                for tag_name, revid in branch.tags.get_tag_dict().items():
 
170
                    if repo.has_revision(revid):
 
171
                        keys.add(tag_name_to_ref(tag_name))
 
172
            except errors.TagsNotSupported:
 
173
                pass
 
174
        return keys
 
175
 
 
176
    def __delitem__(self, ref):
 
177
        try:
 
178
            branch_name = ref_to_branch_name(ref)
 
179
        except ValueError:
 
180
            return  # FIXME: Cope with tags!
 
181
        self.dir.destroy_branch(branch_name)
 
182
 
 
183
    def __setitem__(self, ref, sha):
 
184
        try:
 
185
            branch_name = ref_to_branch_name(ref)
 
186
        except ValueError:
 
187
            # FIXME: Cope with tags!
 
188
            return
 
189
        try:
 
190
            target_branch = self.repo_dir.open_branch(branch_name)
 
191
        except errors.NotBranchError:
 
192
            target_branch = self.repo.create_branch(branch_name)
 
193
 
 
194
        rev_id = self.mapping.revision_id_foreign_to_bzr(sha)
 
195
        with target_branch.lock_write():
 
196
            target_branch.generate_revision_history(rev_id)
 
197
 
 
198
 
 
199
def get_refs_container(controldir, object_store):
 
200
    fn = getattr(controldir, "get_refs_container", None)
 
201
    if fn is not None:
 
202
        return fn()
 
203
    return BazaarRefsContainer(controldir, object_store)
 
204
 
 
205
 
 
206
def remote_refs_dict_to_tag_refs(refs_dict):
 
207
    base = {}
 
208
    peeled = {}
 
209
    for k, v in refs_dict.items():
 
210
        if is_peeled(k):
 
211
            peeled[k[:-3]] = v
 
212
        else:
 
213
            base[k] = v
 
214
            peeled[k] = v
 
215
    all_keys = set().union(base.keys(), peeled.keys())
 
216
    for n in all_keys:
 
217
        try:
 
218
            tag_name = ref_to_tag_name(n)
 
219
        except ValueError:
 
220
            continue
 
221
        yield (n, tag_name, peeled.get(n), base.get(n))