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import os.path
import changeset
from changeset import Inventory, apply_changeset, invert_dict
from bzrlib.osutils import backup_file, rename
from bzrlib.merge3 import Merge3
import bzrlib
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, '<' * 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 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):
return get_id_contents(entry.id, tree)
def get_id_contents(file_id, tree):
"""Get a contents change element suitable for use with ReplaceContents
"""
tree_entry = tree.tree.inventory[file_id]
if tree_entry.kind == "file":
return changeset.FileCreate(tree.get_file(file_id).read())
elif tree_entry.kind == "symlink":
return changeset.SymlinkCreate(tree.get_symlink_target(file_id))
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:
this_contents = get_contents(entry, this)
if this_path is not None and bzrlib.osutils.lexists(this_path):
if this_contents != contents.old_contents:
return conflict_handler.rem_contents_conflict(this_path,
this_contents, contents.old_contents)
return contents
else:
return None
elif contents.old_contents is None:
if this_path is None or not bzrlib.osutils.lexists(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)
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