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
|
import changeset
from changeset import Inventory, apply_changeset, invert_dict
import os.path
from osutils import backup_file
from merge3 import Merge3
class ApplyMerge3:
"""Contents-change wrapper around merge3.Merge3"""
def __init__(self, file_id, base, other):
self.file_id = file_id
self.base = base
self.other = other
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, reverse=False):
new_file = filename+".new"
if not reverse:
base = self.base
other = self.other
else:
base = self.other
other = self.base
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
output_file = file(new_file, "wb")
start_marker = "!START OF MERGE CONFLICT!" + "I HOPE THIS IS UNIQUE"
for line in m3.merge_lines(name_a = "TREE", name_b = "MERGE-SOURCE",
start_marker=start_marker):
if line.startswith(start_marker):
new_conflicts = True
output_file.write(line.replace(start_marker, '<<<<<<<<'))
else:
output_file.write(line)
output_file.close()
if not new_conflicts:
os.chmod(new_file, os.stat(filename).st_mode)
os.rename(new_file, filename)
return
else:
conflict_handler.merge_conflict(new_file, filename, base_lines,
other_lines)
class BackupBeforeChange:
"""Contents-change wrapper to back up file first"""
def __init__(self, contents_change):
self.contents_change = contents_change
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, reverse=False):
backup_file(filename)
self.contents_change.apply(filename, conflict_handler, reverse)
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.tree.inventory),
this.root, conflict_handler, False)
conflict_handler.finalize()
return result
def make_merge_changeset(cset, this, base, other,
conflict_handler, merge_factory):
new_cset = changeset.Changeset()
def get_this_contents(id):
path = this.readonly_path(id)
if os.path.isdir(path):
return changeset.dir_create
else:
return changeset.FileCreate(file(path, "rb").read())
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.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 os.path.join(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 get_contents(entry, tree):
"""Get a contents change element suitable for use with ReplaceContents
"""
tree_entry = tree.tree.inventory[entry.id]
if tree_entry.kind == "file":
return changeset.FileCreate(tree.get_file(entry.id).read())
else:
assert tree_entry.kind in ("root_directory", "directory")
return changeset.dir_create
def make_merged_contents(entry, this, base, other, conflict_handler,
merge_factory):
contents = entry.contents_change
if contents is None:
return None
this_path = this.readonly_path(entry.id)
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):
if contents.old_contents is None and contents.new_contents is None:
return None
if contents.new_contents is None:
if this_path is not None and os.path.exists(this_path):
return contents
else:
return None
elif contents.old_contents is None:
if this_path is None or not os.path.exists(this_path):
return contents
else:
this_contents = get_contents(entry, this)
if this_contents == contents.new_contents:
return None
else:
other_path = other.readonly_path(entry.id)
conflict_handler.new_contents_conflict(this_path,
other_path)
elif isinstance(contents.old_contents, changeset.FileCreate) and \
isinstance(contents.new_contents, changeset.FileCreate):
return make_merge()
else:
raise Exception("Unhandled merge scenario")
def make_merged_metadata(entry, base, other):
if entry.metadata_change is not None:
base_path = base.readonly_path(entry.id)
other_path = other.readonly_path(entry.id)
return PermissionsMerge(base_path, other_path)
class PermissionsMerge(object):
def __init__(self, base_path, other_path):
self.base_path = base_path
self.other_path = other_path
def apply(self, filename, conflict_handler, reverse=False):
if not reverse:
base = self.base_path
other = self.other_path
else:
base = self.other_path
other = self.base_path
base_stat = os.stat(base).st_mode
other_stat = os.stat(other).st_mode
this_stat = os.stat(filename).st_mode
if base_stat &0777 == other_stat &0777:
return
elif this_stat &0777 == other_stat &0777:
return
elif this_stat &0777 == base_stat &0777:
os.chmod(filename, other_stat)
else:
conflict_handler.permission_conflict(filename, base, other)
|