1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
# Copyright (C) 2018 Jelmer Vernooij <jelmer@jelmer.uk>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Git Memory Trees."""
from __future__ import absolute_import
import os
import posixpath
import stat
from dulwich.objects import (
Tree,
)
from breezy import (
errors,
lock,
osutils,
revision as _mod_revision,
tree as _mod_tree,
)
from breezy.transport.memory import MemoryTransport
from .mapping import GitFileIdMap
from .tree import MutableGitIndexTree
class GitMemoryTree(MutableGitIndexTree,_mod_tree.Tree):
"""A Git memory tree."""
def __init__(self, branch, store, head):
MutableGitIndexTree.__init__(self)
self.branch = branch
self.mapping = self.branch.repository.get_mapping()
self.store = store
self.index = {}
self._locks = 0
self._lock_mode = None
self._populate_from_branch()
@property
def controldir(self):
return self.branch.controldir
def is_control_filename(self, path):
return False
def _gather_kinds(self, files, kinds):
"""See MutableTree._gather_kinds.
"""
with self.lock_tree_write():
for pos, f in enumerate(files):
if kinds[pos] is None:
kinds[pos] = self.kind(f)
def put_file_bytes_non_atomic(self, path, bytes, file_id=None):
"""See MutableTree.put_file_bytes_non_atomic."""
self._file_transport.put_bytes(path, bytes)
def _populate_from_branch(self):
"""Populate the in-tree state from the branch."""
if self.branch.head is None:
self._parent_ids = []
else:
self._parent_ids = [self.last_revision()]
self._file_transport = MemoryTransport()
if self.branch.head is None:
tree = Tree()
self._basis_fileid_map = GitFileIdMap({}, self.mapping)
else:
tree_id = self.store[self.branch.head].tree
self._basis_fileid_map = self.mapping.get_fileid_map(
self.store.__getitem__, tree_id)
tree = self.store[tree_id]
self._fileid_map = self._basis_fileid_map.copy()
trees = [("", tree)]
while trees:
(path, tree) = trees.pop()
for name, mode, sha in tree.iteritems():
subpath = posixpath.join(path, name)
if stat.S_ISDIR(mode):
self._file_transport.mkdir(subpath)
trees.append((subpath, self.store[sha]))
elif stat.S_ISREG(mode):
self._file_transport.put_bytes(subpath, self.store[sha].data)
self._index_add_entry(subpath, 'file')
else:
raise NotImplementedError(self._populate_from_branch)
def lock_read(self):
"""Lock the memory tree for reading.
This triggers population of data from the branch for its revision.
"""
self._locks += 1
try:
if self._locks == 1:
self.branch.lock_read()
self._lock_mode = "r"
self._populate_from_branch()
return lock.LogicalLockResult(self.unlock)
except:
self._locks -= 1
raise
def lock_tree_write(self):
"""See MutableTree.lock_tree_write()."""
self._locks += 1
try:
if self._locks == 1:
self.branch.lock_read()
self._lock_mode = "w"
self._populate_from_branch()
elif self._lock_mode == "r":
raise errors.ReadOnlyError(self)
except:
self._locks -= 1
raise
return lock.LogicalLockResult(self.unlock)
def lock_write(self):
"""See MutableTree.lock_write()."""
self._locks += 1
try:
if self._locks == 1:
self.branch.lock_write()
self._lock_mode = "w"
self._populate_from_branch()
elif self._lock_mode == "r":
raise errors.ReadOnlyError(self)
return lock.LogicalLockResult(self.unlock)
except:
self._locks -= 1
raise
def unlock(self):
"""Release a lock.
This frees all cached state when the last lock context for the tree is
left.
"""
if self._locks == 1:
self._parent_ids = []
self.index = {}
try:
self.branch.unlock()
finally:
self._locks = 0
self._lock_mode = None
else:
self._locks -= 1
def _lstat(self, path):
mem_stat = self._file_transport.stat(path)
stat_val = os.stat_result(
(mem_stat.st_mode, 0, 0, 0, 0, 0, mem_stat.st_size, 0, 0, 0))
return stat_val
def get_file_with_stat(self, path, file_id=None):
return (self.get_file(path, file_id), self._lstat(path))
def get_file(self, path, file_id=None):
"""See Tree.get_file."""
return self._file_transport.get(path)
def get_file_sha1(self, path, file_id=None, stat_value=None):
"""See Tree.get_file_sha1()."""
stream = self._file_transport.get(path)
return osutils.sha_file(stream)
def get_parent_ids(self):
"""See Tree.get_parent_ids.
This implementation returns the current cached value from
self._parent_ids.
"""
with self.lock_read():
return list(self._parent_ids)
def last_revision(self):
"""See MutableTree.last_revision."""
with self.lock_read():
if self.branch.head is None:
return _mod_revision.NULL_REVISION
return self.branch.repository.lookup_foreign_revision_id(self.branch.head)
def basis_tree(self):
"""See Tree.basis_tree()."""
return self.branch.repository.revision_tree(self.last_revision())
def get_config_stack(self):
return self.branch.get_config_stack()
def has_filename(self, path):
return self._file_transport.has(path)
def _set_merges_from_parent_ids(self, rhs_parent_ids):
if self.branch.head is None:
self._parent_ids = []
else:
self._parent_ids = [self.last_revision()]
self._parent_ids.extend(rhs_parent_ids)
def set_parent_ids(self, parent_ids, allow_leftmost_as_ghost=False):
if len(parent_ids) == 0:
self._parent_ids = []
self.branch.head = None
else:
self._parent_ids = parent_ids
self.branch.head = self.branch.repository.lookup_bzr_revision_id(parent_ids[0])[0]
def mkdir(self, path, file_id=None):
"""See MutableTree.mkdir()."""
self.add(path, None, 'directory')
self._file_transport.mkdir(path)
def _rename_one(self, from_rel, to_rel):
self._file_transport.rename(from_rel, to_rel)
def kind(self, p):
stat_value = self._file_transport.stat(p)
return osutils.file_kind_from_stat_mode(stat_value.st_mode)
|