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
|
from merge_core import merge_flex
from changeset import generate_changeset, ExceptionConflictHandler
from changeset import Inventory
from bzrlib import Branch
import bzrlib.osutils
from trace import mutter
import os.path
import tempfile
import shutil
import errno
class MergeConflictHandler(ExceptionConflictHandler):
"""Handle conflicts encountered while merging"""
def copy(self, source, dest):
"""Copy the text and mode of a file
:param source: The path of the file to copy
:param dest: The distination file to create
"""
s_file = file(source, "rb")
d_file = file(dest, "wb")
for line in s_file:
d_file.write(line)
os.chmod(dest, 0777 & os.stat(source).st_mode)
def add_suffix(self, name, suffix, last_new_name=None):
"""Rename a file to append a suffix. If the new name exists, the
suffix is added repeatedly until a non-existant name is found
:param name: The path of the file
:param suffix: The suffix to append
:param last_new_name: (used for recursive calls) the last name tried
"""
if last_new_name is None:
last_new_name = name
new_name = last_new_name+suffix
try:
os.rename(name, new_name)
except OSError, e:
if e.errno != errno.EEXIST and e.errno != errno.ENOTEMPTY:
raise
self.add_suffix(name, suffix, last_new_name=new_name)
def merge_conflict(self, new_file, this_path, base_path, other_path):
"""
Handle diff3 conflicts by producing a .THIS, .BASE and .OTHER. The
main file will be a version with diff3 conflicts.
:param new_file: Path to the output file with diff3 markers
:param this_path: Path to the file text for the THIS tree
:param base_path: Path to the file text for the BASE tree
:param other_path: Path to the file text for the OTHER tree
"""
self.add_suffix(this_path, ".THIS")
self.copy(base_path, this_path+".BASE")
self.copy(other_path, this_path+".OTHER")
os.rename(new_file, this_path)
def target_exists(self, entry, target, old_path):
"""Handle the case when the target file or dir exists"""
self.add_suffix(target, ".moved")
class SourceFile:
def __init__(self, path, id, present=None, isdir=None):
self.path = path
self.id = id
self.present = present
self.isdir = isdir
self.interesting = True
def __repr__(self):
return "SourceFile(%s, %s)" % (self.path, self.id)
def get_tree(treespec, temp_root, label):
dir, revno = treespec
branch = Branch(dir)
if revno is None:
base_tree = branch.working_tree()
elif revno == -1:
base_tree = branch.basis_tree()
else:
base_tree = branch.revision_tree(branch.lookup_revision(revno))
temp_path = os.path.join(temp_root, label)
os.mkdir(temp_path)
return MergeTree(base_tree, temp_path)
def abspath(tree, file_id):
path = tree.inventory.id2path(file_id)
if path == "":
return "./."
return "./" + path
def file_exists(tree, file_id):
return tree.has_filename(tree.id2path(file_id))
def inventory_map(tree):
inventory = {}
for file_id in tree.inventory:
if not file_exists(tree, file_id):
continue
path = abspath(tree, file_id)
inventory[path] = SourceFile(path, file_id)
return inventory
class MergeTree(object):
def __init__(self, tree, tempdir):
object.__init__(self)
if hasattr(tree, "basedir"):
self.root = tree.basedir
else:
self.root = None
self.inventory = inventory_map(tree)
self.tree = tree
self.tempdir = tempdir
os.mkdir(os.path.join(self.tempdir, "texts"))
self.cached = {}
def readonly_path(self, id):
if self.root is not None:
return self.tree.abspath(self.tree.id2path(id))
else:
if self.tree.inventory[id].kind in ("directory", "root_directory"):
return self.tempdir
if not self.cached.has_key(id):
path = os.path.join(self.tempdir, "texts", id)
outfile = file(path, "wb")
outfile.write(self.tree.get_file(id).read())
assert(os.path.exists(path))
self.cached[id] = path
return self.cached[id]
def merge(other_revision, base_revision):
tempdir = tempfile.mkdtemp(prefix="bzr-")
try:
this_branch = Branch('.')
other_tree = get_tree(other_revision, tempdir, "other")
base_tree = get_tree(base_revision, tempdir, "base")
merge_inner(this_branch, other_tree, base_tree, tempdir)
finally:
shutil.rmtree(tempdir)
def generate_cset_optimized(tree_a, tree_b, inventory_a, inventory_b):
"""Generate a changeset, using the text_id to mark really-changed files.
This permits blazing comparisons when text_ids are present. It also
disables metadata comparison for files with identical texts.
"""
for file_id in tree_a.tree.inventory:
if file_id not in tree_b.tree.inventory:
continue
entry_a = tree_a.tree.inventory[file_id]
entry_b = tree_b.tree.inventory[file_id]
if (entry_a.kind, entry_b.kind) != ("file", "file"):
continue
if None in (entry_a.text_id, entry_b.text_id):
continue
if entry_a.text_id != entry_b.text_id:
continue
inventory_a[abspath(tree_a.tree, file_id)].interesting = False
inventory_b[abspath(tree_b.tree, file_id)].interesting = False
cset = generate_changeset(tree_a, tree_b, inventory_a, inventory_b)
for entry in cset.entries.itervalues():
entry.metadata_change = None
return cset
def merge_inner(this_branch, other_tree, base_tree, tempdir):
this_tree = get_tree(('.', None), tempdir, "this")
def get_inventory(tree):
return tree.inventory
inv_changes = merge_flex(this_tree, base_tree, other_tree,
generate_cset_optimized, get_inventory,
MergeConflictHandler(base_tree.root))
adjust_ids = []
for id, path in inv_changes.iteritems():
if path is not None:
if path == '.':
path = ''
else:
assert path.startswith('./')
path = path[2:]
adjust_ids.append((path, id))
this_branch.set_inventory(regen_inventory(this_branch, this_tree.root, adjust_ids))
def regen_inventory(this_branch, root, new_entries):
old_entries = this_branch.read_working_inventory()
new_inventory = {}
by_path = {}
for file_id in old_entries:
entry = old_entries[file_id]
path = old_entries.id2path(file_id)
new_inventory[file_id] = (path, file_id, entry.parent_id, entry.kind)
by_path[path] = file_id
deletions = 0
insertions = 0
new_path_list = []
for path, file_id in new_entries:
if path is None:
del new_inventory[file_id]
deletions += 1
else:
new_path_list.append((path, file_id))
if file_id not in old_entries:
insertions += 1
# Ensure no file is added before its parent
new_path_list.sort()
for path, file_id in new_path_list:
if path == '':
parent = None
else:
parent = by_path[os.path.dirname(path)]
kind = bzrlib.osutils.file_kind(os.path.join(root, path))
new_inventory[file_id] = (path, file_id, parent, kind)
by_path[path] = file_id
# Get a list in insertion order
new_inventory_list = new_inventory.values()
mutter ("""Inventory regeneration:
old length: %i insertions: %i deletions: %i new_length: %i"""\
% (len(old_entries), insertions, deletions, len(new_inventory_list)))
assert len(new_inventory_list) == len(old_entries) + insertions - deletions
new_inventory_list.sort()
return new_inventory_list
|