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Viewing changes to breezy/git/memorytree.py

  • Committer: Breezy landing bot
  • Author(s): Colin Watson
  • Date: 2020-11-16 21:47:08 UTC
  • mfrom: (7521.1.1 remove-lp-workaround)
  • Revision ID: breezy.the.bot@gmail.com-20201116214708-jos209mgxi41oy15
Remove breezy.git workaround for bazaar.launchpad.net.

Merged from https://code.launchpad.net/~cjwatson/brz/remove-lp-workaround/+merge/393710

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breezy/git/memorytree.py
 
1
# Copyright (C) 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
 
 
18
"""Git Memory Trees."""
 
19
 
 
20
import os
 
21
import posixpath
 
22
import stat
 
23
 
 
24
from dulwich.index import (
 
25
    index_entry_from_stat,
 
26
    )
 
27
from dulwich.objects import (
 
28
    Blob,
 
29
    Tree,
 
30
    )
 
31
 
 
32
from breezy import (
 
33
    errors,
 
34
    lock,
 
35
    osutils,
 
36
    revision as _mod_revision,
 
37
    tree as _mod_tree,
 
38
    urlutils,
 
39
    )
 
40
from breezy.transport.memory import MemoryTransport
 
41
 
 
42
from .mapping import (
 
43
    decode_git_path,
 
44
    encode_git_path,
 
45
    )
 
46
from .tree import MutableGitIndexTree
 
47
 
 
48
 
 
49
class GitMemoryTree(MutableGitIndexTree, _mod_tree.Tree):
 
50
    """A Git memory tree."""
 
51
 
 
52
    def __init__(self, branch, store, head):
 
53
        MutableGitIndexTree.__init__(self)
 
54
        self.branch = branch
 
55
        self.mapping = self.branch.repository.get_mapping()
 
56
        self.store = store
 
57
        self.index = {}
 
58
        self._locks = 0
 
59
        self._lock_mode = None
 
60
        self._populate_from_branch()
 
61
 
 
62
    def _supports_executable(self):
 
63
        return True
 
64
 
 
65
    @property
 
66
    def controldir(self):
 
67
        return self.branch.controldir
 
68
 
 
69
    def is_control_filename(self, path):
 
70
        return False
 
71
 
 
72
    def _gather_kinds(self, files, kinds):
 
73
        """See MutableTree._gather_kinds.
 
74
        """
 
75
        with self.lock_tree_write():
 
76
            for pos, f in enumerate(files):
 
77
                if kinds[pos] is None:
 
78
                    kinds[pos] = self.kind(f)
 
79
 
 
80
    def put_file_bytes_non_atomic(self, path, bytes):
 
81
        """See MutableTree.put_file_bytes_non_atomic."""
 
82
        self._file_transport.put_bytes(path, bytes)
 
83
 
 
84
    def _populate_from_branch(self):
 
85
        """Populate the in-tree state from the branch."""
 
86
        if self.branch.head is None:
 
87
            self._parent_ids = []
 
88
        else:
 
89
            self._parent_ids = [self.last_revision()]
 
90
        self._file_transport = MemoryTransport()
 
91
        if self.branch.head is None:
 
92
            tree = Tree()
 
93
        else:
 
94
            tree_id = self.store[self.branch.head].tree
 
95
            tree = self.store[tree_id]
 
96
 
 
97
        trees = [("", tree)]
 
98
        while trees:
 
99
            (path, tree) = trees.pop()
 
100
            for name, mode, sha in tree.iteritems():
 
101
                subpath = posixpath.join(path, decode_git_path(name))
 
102
                if stat.S_ISDIR(mode):
 
103
                    self._file_transport.mkdir(subpath)
 
104
                    trees.append((subpath, self.store[sha]))
 
105
                elif stat.S_ISREG(mode):
 
106
                    self._file_transport.put_bytes(
 
107
                        subpath, self.store[sha].data)
 
108
                    self._index_add_entry(subpath, 'file')
 
109
                else:
 
110
                    raise NotImplementedError(self._populate_from_branch)
 
111
 
 
112
    def lock_read(self):
 
113
        """Lock the memory tree for reading.
 
114
 
 
115
        This triggers population of data from the branch for its revision.
 
116
        """
 
117
        self._locks += 1
 
118
        try:
 
119
            if self._locks == 1:
 
120
                self.branch.lock_read()
 
121
                self._lock_mode = "r"
 
122
                self._populate_from_branch()
 
123
            return lock.LogicalLockResult(self.unlock)
 
124
        except BaseException:
 
125
            self._locks -= 1
 
126
            raise
 
127
 
 
128
    def lock_tree_write(self):
 
129
        """See MutableTree.lock_tree_write()."""
 
130
        self._locks += 1
 
131
        try:
 
132
            if self._locks == 1:
 
133
                self.branch.lock_read()
 
134
                self._lock_mode = "w"
 
135
                self._populate_from_branch()
 
136
            elif self._lock_mode == "r":
 
137
                raise errors.ReadOnlyError(self)
 
138
        except BaseException:
 
139
            self._locks -= 1
 
140
            raise
 
141
        return lock.LogicalLockResult(self.unlock)
 
142
 
 
143
    def lock_write(self):
 
144
        """See MutableTree.lock_write()."""
 
145
        self._locks += 1
 
146
        try:
 
147
            if self._locks == 1:
 
148
                self.branch.lock_write()
 
149
                self._lock_mode = "w"
 
150
                self._populate_from_branch()
 
151
            elif self._lock_mode == "r":
 
152
                raise errors.ReadOnlyError(self)
 
153
            return lock.LogicalLockResult(self.unlock)
 
154
        except BaseException:
 
155
            self._locks -= 1
 
156
            raise
 
157
 
 
158
    def unlock(self):
 
159
        """Release a lock.
 
160
 
 
161
        This frees all cached state when the last lock context for the tree is
 
162
        left.
 
163
        """
 
164
        if self._locks == 1:
 
165
            self._parent_ids = []
 
166
            self.index = {}
 
167
            try:
 
168
                self.branch.unlock()
 
169
            finally:
 
170
                self._locks = 0
 
171
                self._lock_mode = None
 
172
        else:
 
173
            self._locks -= 1
 
174
 
 
175
    def _lstat(self, path):
 
176
        mem_stat = self._file_transport.stat(path)
 
177
        stat_val = os.stat_result(
 
178
            (mem_stat.st_mode, 0, 0, 0, 0, 0, mem_stat.st_size, 0, 0, 0))
 
179
        return stat_val
 
180
 
 
181
    def _live_entry(self, path):
 
182
        path = urlutils.quote_from_bytes(path)
 
183
        stat_val = self._lstat(path)
 
184
        if stat.S_ISDIR(stat_val.st_mode):
 
185
            return None
 
186
        elif stat.S_ISLNK(stat_val.st_mode):
 
187
            blob = Blob.from_string(
 
188
                encode_git_path(self._file_transport.readlink(path)))
 
189
        elif stat.S_ISREG(stat_val.st_mode):
 
190
            blob = Blob.from_string(self._file_transport.get_bytes(path))
 
191
        else:
 
192
            raise AssertionError('unknown type %d' % stat_val.st_mode)
 
193
        return index_entry_from_stat(stat_val, blob.id, 0)
 
194
 
 
195
    def get_file_with_stat(self, path):
 
196
        return (self.get_file(path), self._lstat(path))
 
197
 
 
198
    def get_file(self, path):
 
199
        """See Tree.get_file."""
 
200
        return self._file_transport.get(path)
 
201
 
 
202
    def get_file_sha1(self, path, stat_value=None):
 
203
        """See Tree.get_file_sha1()."""
 
204
        stream = self._file_transport.get(path)
 
205
        return osutils.sha_file(stream)
 
206
 
 
207
    def get_parent_ids(self):
 
208
        """See Tree.get_parent_ids.
 
209
 
 
210
        This implementation returns the current cached value from
 
211
            self._parent_ids.
 
212
        """
 
213
        with self.lock_read():
 
214
            return list(self._parent_ids)
 
215
 
 
216
    def last_revision(self):
 
217
        """See MutableTree.last_revision."""
 
218
        with self.lock_read():
 
219
            if self.branch.head is None:
 
220
                return _mod_revision.NULL_REVISION
 
221
            return self.branch.repository.lookup_foreign_revision_id(
 
222
                self.branch.head)
 
223
 
 
224
    def basis_tree(self):
 
225
        """See Tree.basis_tree()."""
 
226
        return self.branch.repository.revision_tree(self.last_revision())
 
227
 
 
228
    def get_config_stack(self):
 
229
        return self.branch.get_config_stack()
 
230
 
 
231
    def has_filename(self, path):
 
232
        return self._file_transport.has(path)
 
233
 
 
234
    def _set_merges_from_parent_ids(self, rhs_parent_ids):
 
235
        if self.branch.head is None:
 
236
            self._parent_ids = []
 
237
        else:
 
238
            self._parent_ids = [self.last_revision()]
 
239
        self._parent_ids.extend(rhs_parent_ids)
 
240
 
 
241
    def set_parent_ids(self, parent_ids, allow_leftmost_as_ghost=False):
 
242
        if len(parent_ids) == 0:
 
243
            self._parent_ids = []
 
244
            self.branch.head = None
 
245
        else:
 
246
            self._parent_ids = parent_ids
 
247
            self.branch.head = self.branch.repository.lookup_bzr_revision_id(
 
248
                parent_ids[0])[0]
 
249
 
 
250
    def mkdir(self, path, file_id=None):
 
251
        """See MutableTree.mkdir()."""
 
252
        self.add(path, None, 'directory')
 
253
        self._file_transport.mkdir(path)
 
254
 
 
255
    def _rename_one(self, from_rel, to_rel):
 
256
        self._file_transport.rename(from_rel, to_rel)
 
257
 
 
258
    def kind(self, p):
 
259
        stat_value = self._file_transport.stat(p)
 
260
        return osutils.file_kind_from_stat_mode(stat_value.st_mode)
 
261
 
 
262
    def get_symlink_target(self, path):
 
263
        with self.lock_read():
 
264
            return self._file_transport.readlink(path)