1
# Copyright (C) 2005 Canonical Ltd
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.
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.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22
from fetch import greedy_fetch
25
import bzrlib.revision
26
from bzrlib.merge_core import merge_flex, ApplyMerge3, BackupBeforeChange
27
from bzrlib.changeset import generate_changeset, ExceptionConflictHandler
28
from bzrlib.changeset import Inventory, Diff3Merge
29
from bzrlib.branch import find_branch
30
from bzrlib.errors import BzrCommandError, UnrelatedBranches, NoCommonAncestor
31
from bzrlib.errors import NoCommits
32
from bzrlib.delta import compare_trees
33
from bzrlib.trace import mutter, warning
34
from bzrlib.fetch import greedy_fetch
35
from bzrlib.revision import is_ancestor
37
# comments from abentley on irc: merge happens in two stages, each
38
# of which generates a changeset object
40
# stage 1: generate OLD->OTHER,
41
# stage 2: use MINE and OLD->OTHER to generate MINE -> RESULT
43
class MergeConflictHandler(ExceptionConflictHandler):
44
"""Handle conflicts encountered while merging.
46
This subclasses ExceptionConflictHandler, so that any types of
47
conflict that are not explicitly handled cause an exception and
50
def __init__(self, ignore_zero=False):
51
ExceptionConflictHandler.__init__(self)
53
self.ignore_zero = ignore_zero
55
def copy(self, source, dest):
56
"""Copy the text and mode of a file
57
:param source: The path of the file to copy
58
:param dest: The distination file to create
60
s_file = file(source, "rb")
61
d_file = file(dest, "wb")
64
os.chmod(dest, 0777 & os.stat(source).st_mode)
66
def dump(self, lines, dest):
67
"""Copy the text and mode of a file
68
:param source: The path of the file to copy
69
:param dest: The distination file to create
71
d_file = file(dest, "wb")
75
def add_suffix(self, name, suffix, last_new_name=None):
76
"""Rename a file to append a suffix. If the new name exists, the
77
suffix is added repeatedly until a non-existant name is found
79
:param name: The path of the file
80
:param suffix: The suffix to append
81
:param last_new_name: (used for recursive calls) the last name tried
83
if last_new_name is None:
85
new_name = last_new_name+suffix
87
os.rename(name, new_name)
90
if e.errno != errno.EEXIST and e.errno != errno.ENOTEMPTY:
92
return self.add_suffix(name, suffix, last_new_name=new_name)
94
def conflict(self, text):
99
def merge_conflict(self, new_file, this_path, base_lines, other_lines):
101
Handle diff3 conflicts by producing a .THIS, .BASE and .OTHER. The
102
main file will be a version with diff3 conflicts.
103
:param new_file: Path to the output file with diff3 markers
104
:param this_path: Path to the file text for the THIS tree
105
:param base_path: Path to the file text for the BASE tree
106
:param other_path: Path to the file text for the OTHER tree
108
self.add_suffix(this_path, ".THIS")
109
self.dump(base_lines, this_path+".BASE")
110
self.dump(other_lines, this_path+".OTHER")
111
os.rename(new_file, this_path)
112
self.conflict("Diff3 conflict encountered in %s" % this_path)
114
def new_contents_conflict(self, filename, other_contents):
115
"""Conflicting contents for newly added file."""
116
self.copy(other_contents, filename + ".OTHER")
117
self.conflict("Conflict in newly added file %s" % filename)
120
def target_exists(self, entry, target, old_path):
121
"""Handle the case when the target file or dir exists"""
122
moved_path = self.add_suffix(target, ".moved")
123
self.conflict("Moved existing %s to %s" % (target, moved_path))
125
def rmdir_non_empty(self, filename):
126
"""Handle the case where the dir to be removed still has contents"""
127
self.conflict("Directory %s not removed because it is not empty"\
132
if not self.ignore_zero:
133
print "%d conflicts encountered.\n" % self.conflicts
135
def get_tree(treespec, temp_root, label, local_branch=None):
136
location, revno = treespec
137
branch = find_branch(location)
141
revision = branch.last_patch()
143
revision = branch.lookup_revision(revno)
144
return branch, get_revid_tree(branch, revision, temp_root, label,
147
def get_revid_tree(branch, revision, temp_root, label, local_branch):
149
base_tree = branch.working_tree()
151
if local_branch is not None:
152
greedy_fetch(local_branch, branch, revision)
153
base_tree = local_branch.revision_tree(revision)
155
base_tree = branch.revision_tree(revision)
156
temp_path = os.path.join(temp_root, label)
158
return MergeTree(base_tree, temp_path)
161
def file_exists(tree, file_id):
162
return tree.has_filename(tree.id2path(file_id))
165
class MergeTree(object):
166
def __init__(self, tree, tempdir):
167
object.__init__(self)
168
if hasattr(tree, "basedir"):
169
self.root = tree.basedir
173
self.tempdir = tempdir
174
os.mkdir(os.path.join(self.tempdir, "texts"))
178
return self.tree.__iter__()
180
def __contains__(self, file_id):
181
return file_id in self.tree
183
def get_file(self, file_id):
184
return self.tree.get_file(file_id)
186
def get_file_sha1(self, id):
187
return self.tree.get_file_sha1(id)
189
def id2path(self, file_id):
190
return self.tree.id2path(file_id)
192
def has_id(self, file_id):
193
return self.tree.has_id(file_id)
195
def has_or_had_id(self, file_id):
196
if file_id == self.tree.inventory.root.file_id:
198
return self.tree.inventory.has_id(file_id)
200
def has_or_had_id(self, file_id):
201
if file_id == self.tree.inventory.root.file_id:
203
return self.tree.inventory.has_id(file_id)
205
def readonly_path(self, id):
206
if id not in self.tree:
208
if self.root is not None:
209
return self.tree.abspath(self.tree.id2path(id))
211
if self.tree.inventory[id].kind in ("directory", "root_directory"):
213
if not self.cached.has_key(id):
214
path = os.path.join(self.tempdir, "texts", id)
215
outfile = file(path, "wb")
216
outfile.write(self.tree.get_file(id).read())
217
assert(os.path.exists(path))
218
self.cached[id] = path
219
return self.cached[id]
223
def merge(other_revision, base_revision,
224
check_clean=True, ignore_zero=False,
225
this_dir=None, backup_files=False, merge_type=ApplyMerge3,
227
"""Merge changes into a tree.
230
tuple(path, revision) Base for three-way merge.
232
tuple(path, revision) Other revision for three-way merge.
234
Directory to merge changes into; '.' by default.
236
If true, this_dir must have no uncommitted changes before the
238
all available ancestors of other_revision and base_revision are
239
automatically pulled into the branch.
241
from bzrlib.revision import common_ancestor, MultipleRevisionSources
242
from bzrlib.errors import NoSuchRevision
243
tempdir = tempfile.mkdtemp(prefix="bzr-")
247
this_branch = find_branch(this_dir)
248
this_rev_id = this_branch.last_patch()
249
if this_rev_id is None:
250
raise BzrCommandError("This branch has no commits")
252
changes = compare_trees(this_branch.working_tree(),
253
this_branch.basis_tree(), False)
254
if changes.has_changed():
255
raise BzrCommandError("Working tree has uncommitted changes.")
256
other_branch, other_tree = get_tree(other_revision, tempdir, "other",
258
if other_revision[1] == -1:
259
other_rev_id = other_branch.last_patch()
260
if other_rev_id is None:
261
raise NoCommits(other_branch)
262
other_basis = other_rev_id
263
elif other_revision[1] is not None:
264
other_rev_id = other_branch.lookup_revision(other_revision[1])
265
other_basis = other_rev_id
268
other_basis = other_branch.last_patch()
269
if other_basis is None:
270
raise NoCommits(other_branch)
271
if base_revision == [None, None]:
273
base_rev_id = common_ancestor(this_rev_id, other_basis,
275
except NoCommonAncestor:
276
raise UnrelatedBranches()
277
base_tree = get_revid_tree(this_branch, base_rev_id, tempdir,
279
base_is_ancestor = True
281
base_branch, base_tree = get_tree(base_revision, tempdir, "base")
282
if base_revision[1] == -1:
283
base_rev_id = base_branch.last_patch()
284
elif base_revision[1] is None:
287
base_rev_id = base_branch.lookup_revision(base_revision[1])
288
if base_rev_id is not None:
289
base_is_ancestor = is_ancestor(this_rev_id, base_rev_id,
290
MultipleRevisionSources(this_branch,
293
base_is_ancestor = False
294
if file_list is None:
295
interesting_ids = None
297
interesting_ids = set()
298
this_tree = this_branch.working_tree()
299
for fname in file_list:
300
path = this_branch.relpath(fname)
302
for tree in (this_tree, base_tree.tree, other_tree.tree):
303
file_id = tree.inventory.path2id(path)
304
if file_id is not None:
305
interesting_ids.add(file_id)
308
raise BzrCommandError("%s is not a source file in any"
310
merge_inner(this_branch, other_tree, base_tree, tempdir,
311
ignore_zero=ignore_zero, backup_files=backup_files,
312
merge_type=merge_type, interesting_ids=interesting_ids)
313
if base_is_ancestor and other_rev_id is not None\
314
and other_rev_id not in this_branch.revision_history():
315
this_branch.add_pending_merge(other_rev_id)
317
shutil.rmtree(tempdir)
320
def set_interesting(inventory_a, inventory_b, interesting_ids):
321
"""Mark files whose ids are in interesting_ids as interesting
323
for inventory in (inventory_a, inventory_b):
324
for path, source_file in inventory.iteritems():
325
source_file.interesting = source_file.id in interesting_ids
328
def generate_cset_optimized(tree_a, tree_b, interesting_ids=None):
329
"""Generate a changeset. If interesting_ids is supplied, only changes
330
to those files will be shown. Metadata changes are stripped.
332
cset = generate_changeset(tree_a, tree_b, interesting_ids)
333
for entry in cset.entries.itervalues():
334
entry.metadata_change = None
338
def merge_inner(this_branch, other_tree, base_tree, tempdir,
339
ignore_zero=False, merge_type=ApplyMerge3, backup_files=False,
340
interesting_ids=None):
342
def merge_factory(file_id, base, other):
343
contents_change = merge_type(file_id, base, other)
345
contents_change = BackupBeforeChange(contents_change)
346
return contents_change
348
this_tree = get_tree((this_branch.base, None), tempdir, "this")[1]
350
def get_inventory(tree):
351
return tree.tree.inventory
353
inv_changes = merge_flex(this_tree, base_tree, other_tree,
354
generate_cset_optimized, get_inventory,
355
MergeConflictHandler(ignore_zero=ignore_zero),
356
merge_factory=merge_factory,
357
interesting_ids=interesting_ids)
360
for id, path in inv_changes.iteritems():
365
assert path.startswith('.' + os.sep), "path is %s" % path
367
adjust_ids.append((path, id))
368
if len(adjust_ids) > 0:
369
this_branch.set_inventory(regen_inventory(this_branch, this_tree.root,
373
def regen_inventory(this_branch, root, new_entries):
374
old_entries = this_branch.read_working_inventory()
378
for path, file_id in new_entries:
381
new_entries_map[file_id] = path
383
def id2path(file_id):
384
path = new_entries_map.get(file_id)
387
entry = old_entries[file_id]
388
if entry.parent_id is None:
390
return os.path.join(id2path(entry.parent_id), entry.name)
392
for file_id in old_entries:
393
entry = old_entries[file_id]
394
path = id2path(file_id)
395
new_inventory[file_id] = (path, file_id, entry.parent_id, entry.kind)
396
by_path[path] = file_id
401
for path, file_id in new_entries:
403
del new_inventory[file_id]
406
new_path_list.append((path, file_id))
407
if file_id not in old_entries:
409
# Ensure no file is added before its parent
411
for path, file_id in new_path_list:
415
parent = by_path[os.path.dirname(path)]
416
kind = bzrlib.osutils.file_kind(os.path.join(root, path))
417
new_inventory[file_id] = (path, file_id, parent, kind)
418
by_path[path] = file_id
420
# Get a list in insertion order
421
new_inventory_list = new_inventory.values()
422
mutter ("""Inventory regeneration:
423
old length: %i insertions: %i deletions: %i new_length: %i"""\
424
% (len(old_entries), insertions, deletions, len(new_inventory_list)))
425
assert len(new_inventory_list) == len(old_entries) + insertions - deletions
426
new_inventory_list.sort()
427
return new_inventory_list
429
merge_types = { "merge3": (ApplyMerge3, "Native diff3-style merge"),
430
"diff3": (Diff3Merge, "Merge using external diff3")
added
removed
bzrlib/merge.py
