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
24
import bzrlib.revision
25
from bzrlib.merge_core import merge_flex, ApplyMerge3, BackupBeforeChange
26
from bzrlib.changeset import generate_changeset, ExceptionConflictHandler
27
from bzrlib.changeset import Inventory, Diff3Merge, ReplaceContents
28
from bzrlib.branch import Branch
29
from bzrlib.errors import BzrCommandError, UnrelatedBranches, NoCommonAncestor
30
from bzrlib.errors import NoCommits
31
from bzrlib.delta import compare_trees
32
from bzrlib.trace import mutter, warning, note
33
from bzrlib.fetch import greedy_fetch, fetch
34
from bzrlib.revision import is_ancestor
35
from bzrlib.osutils import rename
36
from bzrlib.revision import common_ancestor, MultipleRevisionSources
37
from bzrlib.errors import NoSuchRevision
39
# TODO: build_working_dir can be built on something simpler than merge()
41
# FIXME: merge() parameters seem oriented towards the command line
42
# NOTABUG: merge is a helper for commandline functions. merge_inner is the
43
# the core functionality.
45
# comments from abentley on irc: merge happens in two stages, each
46
# of which generates a changeset object
48
# stage 1: generate OLD->OTHER,
49
# stage 2: use MINE and OLD->OTHER to generate MINE -> RESULT
51
class MergeConflictHandler(ExceptionConflictHandler):
52
"""Handle conflicts encountered while merging.
54
This subclasses ExceptionConflictHandler, so that any types of
55
conflict that are not explicitly handled cause an exception and
58
def __init__(self, this_tree, base_tree, other_tree, ignore_zero=False):
59
ExceptionConflictHandler.__init__(self)
61
self.ignore_zero = ignore_zero
62
self.this_tree = this_tree
63
self.base_tree = base_tree
64
self.other_tree = other_tree
66
def copy(self, source, 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
s_file = file(source, "rb")
72
d_file = file(dest, "wb")
75
os.chmod(dest, 0777 & os.stat(source).st_mode)
77
def dump(self, lines, dest):
78
"""Copy the text and mode of a file
79
:param source: The path of the file to copy
80
:param dest: The distination file to create
82
d_file = file(dest, "wb")
86
def add_suffix(self, name, suffix, last_new_name=None):
87
"""Rename a file to append a suffix. If the new name exists, the
88
suffix is added repeatedly until a non-existant name is found
90
:param name: The path of the file
91
:param suffix: The suffix to append
92
:param last_new_name: (used for recursive calls) the last name tried
94
if last_new_name is None:
96
new_name = last_new_name+suffix
98
rename(name, new_name)
101
if e.errno != errno.EEXIST and e.errno != errno.ENOTEMPTY:
103
return self.add_suffix(name, suffix, last_new_name=new_name)
105
def conflict(self, text):
110
def merge_conflict(self, new_file, this_path, base_lines, other_lines):
112
Handle diff3 conflicts by producing a .THIS, .BASE and .OTHER. The
113
main file will be a version with diff3 conflicts.
114
:param new_file: Path to the output file with diff3 markers
115
:param this_path: Path to the file text for the THIS tree
116
:param base_path: Path to the file text for the BASE tree
117
:param other_path: Path to the file text for the OTHER tree
119
self.add_suffix(this_path, ".THIS")
120
self.dump(base_lines, this_path+".BASE")
121
self.dump(other_lines, this_path+".OTHER")
122
rename(new_file, this_path)
123
self.conflict("Diff3 conflict encountered in %s" % this_path)
125
def new_contents_conflict(self, filename, other_contents):
126
"""Conflicting contents for newly added file."""
127
other.contents.apply(filename + ".OTHER")
128
self.conflict("Conflict in newly added file %s" % filename)
131
def target_exists(self, entry, target, old_path):
132
"""Handle the case when the target file or dir exists"""
133
moved_path = self.add_suffix(target, ".moved")
134
self.conflict("Moved existing %s to %s" % (target, moved_path))
136
def rmdir_non_empty(self, filename):
137
"""Handle the case where the dir to be removed still has contents"""
138
self.conflict("Directory %s not removed because it is not empty"\
142
def rem_contents_conflict(self, filename, this_contents, base_contents):
143
base_contents(filename+".BASE", self, False)
144
this_contents(filename+".THIS", self, False)
145
return ReplaceContents(this_contents, None)
147
def rem_contents_conflict(self, filename, this_contents, base_contents):
148
base_contents(filename+".BASE", self, False)
149
this_contents(filename+".THIS", self, False)
150
self.conflict("Other branch deleted locally modified file %s" %
152
return ReplaceContents(this_contents, None)
154
def abs_this_path(self, file_id):
155
"""Return the absolute path for a file_id in the this tree."""
156
return self.this_tree.id2abspath(file_id)
158
def add_missing_parents(self, file_id, tree):
159
"""If some of the parents for file_id are missing, add them."""
160
entry = tree.inventory[file_id]
161
if entry.parent_id not in self.this_tree:
162
return self.create_all_missing(entry.parent_id, tree)
164
return self.abs_this_path(entry.parent_id)
166
def create_all_missing(self, file_id, tree):
167
"""Add contents for a file_id and all its parents to a tree."""
168
entry = tree.inventory[file_id]
169
if entry.parent_id is not None and entry.parent_id not in self.this_tree:
170
abspath = self.create_all_missing(entry.parent_id, tree)
172
abspath = self.abs_this_path(entry.parent_id)
173
entry_path = os.path.join(abspath, entry.name)
174
if not os.path.isdir(entry_path):
175
self.create(file_id, entry_path, tree)
178
def create(self, file_id, path, tree, reverse=False):
179
"""Uses tree data to create a filesystem object for the file_id"""
180
from changeset import get_contents
181
get_contents(tree, file_id)(path, self, reverse)
183
def missing_for_merge(self, file_id, other_path):
184
"""The file_id doesn't exist in THIS, but does in OTHER and BASE"""
185
self.conflict("Other branch modified locally deleted file %s" %
187
parent_dir = self.add_missing_parents(file_id, self.other_tree)
188
stem = os.path.join(parent_dir, os.path.basename(other_path))
189
self.create(file_id, stem+".OTHER", self.other_tree)
190
self.create(file_id, stem+".BASE", self.base_tree)
192
def threeway_contents_conflict(filename, this_contents, base_contents,
194
self.conflict("Three-way conflict merging %s" % filename)
197
if not self.ignore_zero:
198
note("%d conflicts encountered.\n" % self.conflicts)
200
def get_tree(treespec, local_branch=None):
201
location, revno = treespec
202
branch = Branch.open_containing(location)
206
revision = branch.last_revision()
208
revision = branch.get_rev_id(revno)
209
return branch, get_revid_tree(branch, revision, local_branch)
211
def get_revid_tree(branch, revision, local_branch):
213
base_tree = branch.working_tree()
215
if local_branch is not None:
216
greedy_fetch(local_branch, branch, revision)
217
base_tree = local_branch.revision_tree(revision)
219
base_tree = branch.revision_tree(revision)
223
def file_exists(tree, file_id):
224
return tree.has_filename(tree.id2path(file_id))
227
def build_working_dir(to_dir):
228
"""Build a working directory in an empty directory.
230
to_dir is a directory containing branch metadata but no working files,
231
typically constructed by cloning an existing branch.
233
This is split out as a special idiomatic case of merge. It could
234
eventually be done by just building the tree directly calling into
235
lower-level code (e.g. constructing a changeset).
237
merge((to_dir, -1), (to_dir, 0), this_dir=to_dir,
238
check_clean=False, ignore_zero=True)
241
def merge(other_revision, base_revision,
242
check_clean=True, ignore_zero=False,
243
this_dir=None, backup_files=False, merge_type=ApplyMerge3,
244
file_list=None, show_base=False):
245
"""Merge changes into a tree.
248
tuple(path, revision) Base for three-way merge.
250
tuple(path, revision) Other revision for three-way merge.
252
Directory to merge changes into; '.' by default.
254
If true, this_dir must have no uncommitted changes before the
256
ignore_zero - If true, suppress the "zero conflicts" message when
257
there are no conflicts; should be set when doing something we expect
258
to complete perfectly.
260
All available ancestors of other_revision and base_revision are
261
automatically pulled into the branch.
263
tempdir = tempfile.mkdtemp(prefix="bzr-")
267
this_branch = Branch.open_containing(this_dir)
268
this_rev_id = this_branch.last_revision()
269
if this_rev_id is None:
270
raise BzrCommandError("This branch has no commits")
272
changes = compare_trees(this_branch.working_tree(),
273
this_branch.basis_tree(), False)
274
if changes.has_changed():
275
raise BzrCommandError("Working tree has uncommitted changes.")
276
other_branch, other_tree = get_tree(other_revision, this_branch)
277
if other_revision[1] == -1:
278
other_rev_id = other_branch.last_revision()
279
if other_rev_id is None:
280
raise NoCommits(other_branch)
281
other_basis = other_rev_id
282
elif other_revision[1] is not None:
283
other_rev_id = other_branch.get_rev_id(other_revision[1])
284
other_basis = other_rev_id
287
other_basis = other_branch.last_revision()
288
if other_basis is None:
289
raise NoCommits(other_branch)
290
if base_revision == [None, None]:
292
base_rev_id = common_ancestor(this_rev_id, other_basis,
294
except NoCommonAncestor:
295
raise UnrelatedBranches()
296
base_tree = get_revid_tree(this_branch, base_rev_id, None)
297
base_is_ancestor = True
299
base_branch, base_tree = get_tree(base_revision)
300
if base_revision[1] == -1:
301
base_rev_id = base_branch.last_revision()
302
elif base_revision[1] is None:
305
base_rev_id = base_branch.get_rev_id(base_revision[1])
306
fetch(from_branch=base_branch, to_branch=this_branch)
307
base_is_ancestor = is_ancestor(this_rev_id, base_rev_id,
309
if file_list is None:
310
interesting_ids = None
312
interesting_ids = set()
313
this_tree = this_branch.working_tree()
314
for fname in file_list:
315
path = this_tree.relpath(fname)
317
for tree in (this_tree, base_tree, other_tree):
318
file_id = tree.inventory.path2id(path)
319
if file_id is not None:
320
interesting_ids.add(file_id)
323
raise BzrCommandError("%s is not a source file in any"
325
merge_inner(this_branch, other_tree, base_tree, tempdir,
326
ignore_zero=ignore_zero, backup_files=backup_files,
327
merge_type=merge_type, interesting_ids=interesting_ids,
329
if base_is_ancestor and other_rev_id is not None\
330
and other_rev_id not in this_branch.revision_history():
331
this_branch.add_pending_merge(other_rev_id)
333
shutil.rmtree(tempdir)
336
def set_interesting(inventory_a, inventory_b, interesting_ids):
337
"""Mark files whose ids are in interesting_ids as interesting
339
for inventory in (inventory_a, inventory_b):
340
for path, source_file in inventory.iteritems():
341
source_file.interesting = source_file.id in interesting_ids
344
def merge_inner(this_branch, other_tree, base_tree, tempdir,
345
ignore_zero=False, merge_type=ApplyMerge3, backup_files=False,
346
interesting_ids=None, show_base=False):
348
def merge_factory(file_id, base, other):
349
if show_base is True:
350
contents_change = merge_type(file_id, base, other, show_base=True)
352
contents_change = merge_type(file_id, base, other)
354
contents_change = BackupBeforeChange(contents_change)
355
return contents_change
357
this_tree = get_tree((this_branch.base, None))[1]
359
def get_inventory(tree):
360
return tree.inventory
362
inv_changes = merge_flex(this_tree, base_tree, other_tree,
363
generate_changeset, get_inventory,
364
MergeConflictHandler(this_tree, base_tree,
365
other_tree, ignore_zero=ignore_zero),
366
merge_factory=merge_factory,
367
interesting_ids=interesting_ids)
370
for id, path in inv_changes.iteritems():
375
assert path.startswith('.' + os.sep), "path is %s" % path
377
adjust_ids.append((path, id))
378
if len(adjust_ids) > 0:
379
this_branch.set_inventory(regen_inventory(this_branch,
384
def regen_inventory(this_branch, root, new_entries):
385
old_entries = this_branch.read_working_inventory()
389
for path, file_id in new_entries:
392
new_entries_map[file_id] = path
394
def id2path(file_id):
395
path = new_entries_map.get(file_id)
398
entry = old_entries[file_id]
399
if entry.parent_id is None:
401
return os.path.join(id2path(entry.parent_id), entry.name)
403
for file_id in old_entries:
404
entry = old_entries[file_id]
405
path = id2path(file_id)
406
new_inventory[file_id] = (path, file_id, entry.parent_id, entry.kind)
407
by_path[path] = file_id
412
for path, file_id in new_entries:
414
del new_inventory[file_id]
417
new_path_list.append((path, file_id))
418
if file_id not in old_entries:
420
# Ensure no file is added before its parent
422
for path, file_id in new_path_list:
426
parent = by_path[os.path.dirname(path)]
427
kind = bzrlib.osutils.file_kind(os.path.join(root, path))
428
new_inventory[file_id] = (path, file_id, parent, kind)
429
by_path[path] = file_id
431
# Get a list in insertion order
432
new_inventory_list = new_inventory.values()
433
mutter ("""Inventory regeneration:
434
old length: %i insertions: %i deletions: %i new_length: %i"""\
435
% (len(old_entries), insertions, deletions, len(new_inventory_list)))
436
assert len(new_inventory_list) == len(old_entries) + insertions - deletions
437
new_inventory_list.sort()
438
return new_inventory_list
440
merge_types = { "merge3": (ApplyMerge3, "Native diff3-style merge"),
441
"diff3": (Diff3Merge, "Merge using external diff3")
added
removed
bzrlib/merge.py
