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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
|
from os import fdopen
import os.path
from tempfile import mkstemp
from bzrlib import _changeset
from bzrlib._changeset import Inventory, apply_changeset, invert_dict
from bzrlib.osutils import backup_file, rename, pathjoin
from bzrlib.merge3 import Merge3
import bzrlib
from bzrlib.atomicfile import AtomicFile
from bzrlib._changeset import get_contents
class ApplyMerge3:
"""Contents-change wrapper around merge3.Merge3"""
history_based = False
def __init__(self, file_id, base, other, show_base=False, reprocess=False):
self.file_id = file_id
self.base = base
self.other = other
self.show_base = show_base
self.reprocess = reprocess
def is_creation(self):
return False
def is_deletion(self):
return False
def __eq__(self, other):
if not isinstance(other, ApplyMerge3):
return False
return (self.base == other.base and
self.other == other.other and self.file_id == other.file_id)
def __ne__(self, other):
return not (self == other)
def apply(self, filename, conflict_handler):
output_file, new_file = mkstemp(dir=os.path.dirname(filename),
prefix=os.path.basename(filename))
output_file = fdopen(output_file, 'wb')
base = self.base
other = self.other
def get_lines(tree):
if self.file_id not in tree:
raise Exception("%s not in tree" % self.file_id)
return ()
return tree.get_file(self.file_id).readlines()
base_lines = get_lines(base)
other_lines = get_lines(other)
m3 = Merge3(base_lines, file(filename, "rb").readlines(), other_lines)
new_conflicts = False
start_marker = "!START OF MERGE CONFLICT!" + "I HOPE THIS IS UNIQUE"
if self.show_base is True:
base_marker = '|' * 7
else:
base_marker = None
for line in m3.merge_lines(name_a = "TREE", name_b = "MERGE-SOURCE",
name_base = "BASE-REVISION",
start_marker=start_marker, base_marker=base_marker,
reprocess = self.reprocess):
if line.startswith(start_marker):
new_conflicts = True
output_file.write(line.replace(start_marker, '<' * 7))
else:
output_file.write(line)
output_file.close()
if not new_conflicts:
os.chmod(new_file, os.stat(filename).st_mode)
rename(new_file, filename)
return
else:
conflict_handler.merge_conflict(new_file, filename, base_lines,
other_lines)
class WeaveMerge:
"""Contents-change wrapper around weave merge"""
history_based = True
def __init__(self, weave, this_revision_id, other_revision_id):
self.weave = weave
self.this_revision_id = this_revision_id
self.other_revision_id = other_revision_id
def is_creation(self):
return False
def is_deletion(self):
return False
def __eq__(self, other):
if not isinstance(other, WeaveMerge):
return False
return self.weave == other.weave and\
self.this_revision_id == other.this_revision_id and\
self.other_revision_id == other.other_revision_id
def __ne__(self, other):
return not (self == other)
def apply(self, filename, conflict_handler):
this_i = self.weave.lookup(self.this_revision_id)
other_i = self.weave.lookup(self.other_revision_id)
plan = self.weave.plan_merge(this_i, other_i)
lines = self.weave.weave_merge(plan)
conflicts = False
out_file = AtomicFile(filename, mode='wb')
for line in lines:
if line == '<<<<<<<\n':
conflicts = True
out_file.write(line)
if conflicts:
conflict_handler.weave_merge_conflict(filename, self.weave,
other_i, out_file)
else:
out_file.commit()
class BackupBeforeChange:
"""Contents-change wrapper to back up file first"""
def __init__(self, contents_change):
self.contents_change = contents_change
def is_creation(self):
return self.contents_change.is_creation()
def is_deletion(self):
return self.contents_change.is_deletion()
def __eq__(self, other):
if not isinstance(other, BackupBeforeChange):
return False
return (self.contents_change == other.contents_change)
def __ne__(self, other):
return not (self == other)
def apply(self, filename, conflict_handler):
backup_file(filename)
self.contents_change.apply(filename, conflict_handler)
def invert_invent(inventory):
invert_invent = {}
for file_id in inventory:
path = inventory.id2path(file_id)
if path == '':
path = './.'
else:
path = './' + path
invert_invent[file_id] = path
return invert_invent
def merge_flex(this, base, other, changeset_function, inventory_function,
conflict_handler, merge_factory, interesting_ids):
cset = changeset_function(base, other, interesting_ids)
new_cset = make_merge_changeset(cset, this, base, other,
conflict_handler, merge_factory)
result = apply_changeset(new_cset, invert_invent(this.inventory),
this.basedir, conflict_handler)
return result
def make_merge_changeset(cset, this, base, other,
conflict_handler, merge_factory):
new_cset = _changeset.Changeset()
for entry in cset.entries.itervalues():
if entry.is_boring():
new_cset.add_entry(entry)
else:
new_entry = make_merged_entry(entry, this, base, other,
conflict_handler)
new_contents = make_merged_contents(entry, this, base, other,
conflict_handler,
merge_factory)
new_entry.contents_change = new_contents
new_entry.metadata_change = make_merged_metadata(entry, base, other)
new_cset.add_entry(new_entry)
return new_cset
class ThreeWayConflict(Exception):
def __init__(self, this, base, other):
self.this = this
self.base = base
self.other = other
msg = "Conflict merging %s %s and %s" % (this, base, other)
Exception.__init__(self, msg)
def threeway_select(this, base, other):
"""Returns a value selected by the three-way algorithm.
Raises ThreewayConflict if the algorithm yields a conflict"""
if base == other:
return this
elif base == this:
return other
elif other == this:
return this
else:
raise ThreeWayConflict(this, base, other)
def make_merged_entry(entry, this, base, other, conflict_handler):
from bzrlib.trace import mutter
def entry_data(file_id, tree):
assert hasattr(tree, "__contains__"), "%s" % tree
if not tree.has_or_had_id(file_id):
return (None, None, "")
entry = tree.inventory[file_id]
my_dir = tree.id2path(entry.parent_id)
if my_dir is None:
my_dir = ""
return entry.name, entry.parent_id, my_dir
this_name, this_parent, this_dir = entry_data(entry.id, this)
base_name, base_parent, base_dir = entry_data(entry.id, base)
other_name, other_parent, other_dir = entry_data(entry.id, other)
mutter("Dirs: this, base, other %r %r %r", this_dir, base_dir, other_dir)
mutter("Names: this, base, other %r %r %r", this_name, base_name, other_name)
old_name = this_name
try:
new_name = threeway_select(this_name, base_name, other_name)
except ThreeWayConflict:
new_name = conflict_handler.rename_conflict(entry.id, this_name,
base_name, other_name)
old_parent = this_parent
try:
new_parent = threeway_select(this_parent, base_parent, other_parent)
except ThreeWayConflict:
new_parent = conflict_handler.move_conflict(entry.id, this_dir,
base_dir, other_dir)
def get_path(name, parent):
if name is not None:
if name == "":
assert parent is None
return './.'
parent_dir = {this_parent: this_dir, other_parent: other_dir,
base_parent: base_dir}
directory = parent_dir[parent]
return pathjoin(directory, name)
else:
assert parent is None
return None
old_path = get_path(old_name, old_parent)
new_entry = _changeset.ChangesetEntry(entry.id, old_parent, old_path)
new_entry.new_path = get_path(new_name, new_parent)
new_entry.new_parent = new_parent
mutter(repr(new_entry))
return new_entry
def make_merged_contents(entry, this, base, other, conflict_handler,
merge_factory):
contents = entry.contents_change
if contents is None:
return None
if entry.id in this:
this_path = this.id2abspath(entry.id)
else:
this_path = None
def make_merge():
if this_path is None:
return conflict_handler.missing_for_merge(entry.id,
other.id2path(entry.id))
return merge_factory(entry.id, base, other)
if isinstance(contents, _changeset.ReplaceContents):
base_contents = contents.old_contents
other_contents = contents.new_contents
if base_contents is None and other_contents is None:
return None
if other_contents is None:
this_contents = get_contents(this, entry.id)
if this_path is not None and bzrlib.osutils.lexists(this_path):
if this_contents != base_contents:
return conflict_handler.rem_contents_conflict(this_path,
this_contents, base_contents)
return contents
else:
return None
elif base_contents is None:
if this_path is None or not bzrlib.osutils.lexists(this_path):
return contents
else:
this_contents = get_contents(this, entry.id)
if this_contents == other_contents:
return None
else:
conflict_handler.new_contents_conflict(this_path,
other_contents)
elif isinstance(base_contents, _changeset.TreeFileCreate) and \
isinstance(other_contents, _changeset.TreeFileCreate):
return make_merge()
else:
this_contents = get_contents(this, entry.id)
if this_contents == base_contents:
return contents
elif this_contents == other_contents:
return None
elif base_contents == other_contents:
return None
else:
conflict_handler.threeway_contents_conflict(this_path,
this_contents,
base_contents,
other_contents)
def make_merged_metadata(entry, base, other):
metadata = entry.metadata_change
if metadata is None:
return None
assert isinstance(metadata, _changeset.ChangeExecFlag)
if metadata.new_exec_flag is None:
return None
elif metadata.old_exec_flag is None:
return metadata
else:
return ExecFlagMerge(base, other, entry.id)
class ExecFlagMerge(object):
def __init__(self, base_tree, other_tree, file_id):
self.base_tree = base_tree
self.other_tree = other_tree
self.file_id = file_id
def apply(self, filename, conflict_handler):
base = self.base_tree
other = self.other_tree
base_exec_flag = base.is_executable(self.file_id)
other_exec_flag = other.is_executable(self.file_id)
this_mode = os.stat(filename).st_mode
this_exec_flag = bool(this_mode & 0111)
if (base_exec_flag != other_exec_flag and
this_exec_flag != other_exec_flag):
assert this_exec_flag == base_exec_flag
current_mode = os.stat(filename).st_mode
if other_exec_flag:
umask = os.umask(0)
os.umask(umask)
to_mode = current_mode | (0100 & ~umask)
# Enable x-bit for others only if they can read it.
if current_mode & 0004:
to_mode |= 0001 & ~umask
if current_mode & 0040:
to_mode |= 0010 & ~umask
else:
to_mode = current_mode & ~0111
os.chmod(filename, to_mode)
|