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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/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
from __future__ import absolute_import
 
21
 
 
22
import os
 
23
import posixpath
 
24
import stat
 
25
 
 
26
from dulwich.index import (
 
27
    index_entry_from_stat,
 
28
    )
 
29
from dulwich.objects import (
 
30
    Blob,
 
31
    Tree,
 
32
    )
 
33
 
 
34
from breezy import (
 
35
    errors,
 
36
    lock,
 
37
    osutils,
 
38
    revision as _mod_revision,
 
39
    tree as _mod_tree,
 
40
    urlutils,
 
41
    )
 
42
from breezy.transport.memory import MemoryTransport
 
43
 
 
44
from .tree import MutableGitIndexTree
 
45
 
 
46
 
 
47
class GitMemoryTree(MutableGitIndexTree, _mod_tree.Tree):
 
48
    """A Git memory tree."""
 
49
 
 
50
    def __init__(self, branch, store, head):
 
51
        MutableGitIndexTree.__init__(self)
 
52
        self.branch = branch
 
53
        self.mapping = self.branch.repository.get_mapping()
 
54
        self.store = store
 
55
        self.index = {}
 
56
        self._locks = 0
 
57
        self._lock_mode = None
 
58
        self._populate_from_branch()
 
59
 
 
60
    def _supports_executable(self):
 
61
        return True
 
62
 
 
63
    @property
 
64
    def controldir(self):
 
65
        return self.branch.controldir
 
66
 
 
67
    def is_control_filename(self, path):
 
68
        return False
 
69
 
 
70
    def _gather_kinds(self, files, kinds):
 
71
        """See MutableTree._gather_kinds.
 
72
        """
 
73
        with self.lock_tree_write():
 
74
            for pos, f in enumerate(files):
 
75
                if kinds[pos] is None:
 
76
                    kinds[pos] = self.kind(f)
 
77
 
 
78
    def put_file_bytes_non_atomic(self, path, bytes):
 
79
        """See MutableTree.put_file_bytes_non_atomic."""
 
80
        self._file_transport.put_bytes(path, bytes)
 
81
 
 
82
    def _populate_from_branch(self):
 
83
        """Populate the in-tree state from the branch."""
 
84
        if self.branch.head is None:
 
85
            self._parent_ids = []
 
86
        else:
 
87
            self._parent_ids = [self.last_revision()]
 
88
        self._file_transport = MemoryTransport()
 
89
        if self.branch.head is None:
 
90
            tree = Tree()
 
91
        else:
 
92
            tree_id = self.store[self.branch.head].tree
 
93
            tree = self.store[tree_id]
 
94
 
 
95
        trees = [("", tree)]
 
96
        while trees:
 
97
            (path, tree) = trees.pop()
 
98
            for name, mode, sha in tree.iteritems():
 
99
                subpath = posixpath.join(path, name.decode('utf-8'))
 
100
                if stat.S_ISDIR(mode):
 
101
                    self._file_transport.mkdir(subpath)
 
102
                    trees.append((subpath, self.store[sha]))
 
103
                elif stat.S_ISREG(mode):
 
104
                    self._file_transport.put_bytes(
 
105
                        subpath, self.store[sha].data)
 
106
                    self._index_add_entry(subpath, 'file')
 
107
                else:
 
108
                    raise NotImplementedError(self._populate_from_branch)
 
109
 
 
110
    def lock_read(self):
 
111
        """Lock the memory tree for reading.
 
112
 
 
113
        This triggers population of data from the branch for its revision.
 
114
        """
 
115
        self._locks += 1
 
116
        try:
 
117
            if self._locks == 1:
 
118
                self.branch.lock_read()
 
119
                self._lock_mode = "r"
 
120
                self._populate_from_branch()
 
121
            return lock.LogicalLockResult(self.unlock)
 
122
        except BaseException:
 
123
            self._locks -= 1
 
124
            raise
 
125
 
 
126
    def lock_tree_write(self):
 
127
        """See MutableTree.lock_tree_write()."""
 
128
        self._locks += 1
 
129
        try:
 
130
            if self._locks == 1:
 
131
                self.branch.lock_read()
 
132
                self._lock_mode = "w"
 
133
                self._populate_from_branch()
 
134
            elif self._lock_mode == "r":
 
135
                raise errors.ReadOnlyError(self)
 
136
        except BaseException:
 
137
            self._locks -= 1
 
138
            raise
 
139
        return lock.LogicalLockResult(self.unlock)
 
140
 
 
141
    def lock_write(self):
 
142
        """See MutableTree.lock_write()."""
 
143
        self._locks += 1
 
144
        try:
 
145
            if self._locks == 1:
 
146
                self.branch.lock_write()
 
147
                self._lock_mode = "w"
 
148
                self._populate_from_branch()
 
149
            elif self._lock_mode == "r":
 
150
                raise errors.ReadOnlyError(self)
 
151
            return lock.LogicalLockResult(self.unlock)
 
152
        except BaseException:
 
153
            self._locks -= 1
 
154
            raise
 
155
 
 
156
    def unlock(self):
 
157
        """Release a lock.
 
158
 
 
159
        This frees all cached state when the last lock context for the tree is
 
160
        left.
 
161
        """
 
162
        if self._locks == 1:
 
163
            self._parent_ids = []
 
164
            self.index = {}
 
165
            try:
 
166
                self.branch.unlock()
 
167
            finally:
 
168
                self._locks = 0
 
169
                self._lock_mode = None
 
170
        else:
 
171
            self._locks -= 1
 
172
 
 
173
    def _lstat(self, path):
 
174
        mem_stat = self._file_transport.stat(path)
 
175
        stat_val = os.stat_result(
 
176
            (mem_stat.st_mode, 0, 0, 0, 0, 0, mem_stat.st_size, 0, 0, 0))
 
177
        return stat_val
 
178
 
 
179
    def _live_entry(self, path):
 
180
        path = urlutils.quote_from_bytes(path)
 
181
        stat_val = self._lstat(path)
 
182
        if stat.S_ISDIR(stat_val.st_mode):
 
183
            return None
 
184
        elif stat.S_ISLNK(stat_val.st_mode):
 
185
            blob = Blob.from_string(
 
186
                self._file_transport.readlink(path).encode('utf-8'))
 
187
        elif stat.S_ISREG(stat_val.st_mode):
 
188
            blob = Blob.from_string(self._file_transport.get_bytes(path))
 
189
        else:
 
190
            raise AssertionError('unknown type %d' % stat_val.st_mode)
 
191
        return index_entry_from_stat(stat_val, blob.id, 0)
 
192
 
 
193
    def get_file_with_stat(self, path):
 
194
        return (self.get_file(path), self._lstat(path))
 
195
 
 
196
    def get_file(self, path):
 
197
        """See Tree.get_file."""
 
198
        return self._file_transport.get(path)
 
199
 
 
200
    def get_file_sha1(self, path, stat_value=None):
 
201
        """See Tree.get_file_sha1()."""
 
202
        stream = self._file_transport.get(path)
 
203
        return osutils.sha_file(stream)
 
204
 
 
205
    def get_parent_ids(self):
 
206
        """See Tree.get_parent_ids.
 
207
 
 
208
        This implementation returns the current cached value from
 
209
            self._parent_ids.
 
210
        """
 
211
        with self.lock_read():
 
212
            return list(self._parent_ids)
 
213
 
 
214
    def last_revision(self):
 
215
        """See MutableTree.last_revision."""
 
216
        with self.lock_read():
 
217
            if self.branch.head is None:
 
218
                return _mod_revision.NULL_REVISION
 
219
            return self.branch.repository.lookup_foreign_revision_id(
 
220
                self.branch.head)
 
221
 
 
222
    def basis_tree(self):
 
223
        """See Tree.basis_tree()."""
 
224
        return self.branch.repository.revision_tree(self.last_revision())
 
225
 
 
226
    def get_config_stack(self):
 
227
        return self.branch.get_config_stack()
 
228
 
 
229
    def has_filename(self, path):
 
230
        return self._file_transport.has(path)
 
231
 
 
232
    def _set_merges_from_parent_ids(self, rhs_parent_ids):
 
233
        if self.branch.head is None:
 
234
            self._parent_ids = []
 
235
        else:
 
236
            self._parent_ids = [self.last_revision()]
 
237
        self._parent_ids.extend(rhs_parent_ids)
 
238
 
 
239
    def set_parent_ids(self, parent_ids, allow_leftmost_as_ghost=False):
 
240
        if len(parent_ids) == 0:
 
241
            self._parent_ids = []
 
242
            self.branch.head = None
 
243
        else:
 
244
            self._parent_ids = parent_ids
 
245
            self.branch.head = self.branch.repository.lookup_bzr_revision_id(
 
246
                parent_ids[0])[0]
 
247
 
 
248
    def mkdir(self, path, file_id=None):
 
249
        """See MutableTree.mkdir()."""
 
250
        self.add(path, None, 'directory')
 
251
        self._file_transport.mkdir(path)
 
252
 
 
253
    def _rename_one(self, from_rel, to_rel):
 
254
        self._file_transport.rename(from_rel, to_rel)
 
255
 
 
256
    def kind(self, p):
 
257
        stat_value = self._file_transport.stat(p)
 
258
        return osutils.file_kind_from_stat_mode(stat_value.st_mode)
 
259
 
 
260
    def get_symlink_target(self, path):
 
261
        with self.lock_read():
 
262
            return self._file_transport.readlink(path)