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from merge_core import merge_flex
from changeset import generate_changeset, ExceptionConflictHandler
from changeset import Inventory
from bzrlib import find_branch
import bzrlib.osutils
from bzrlib.errors import BzrCommandError
from bzrlib.diff import compare_trees
from trace import mutter, warning
import os.path
import tempfile
import shutil
import errno
class UnrelatedBranches(BzrCommandError):
def __init__(self):
msg = "Branches have no common ancestor, and no base revision"\
" specified."
BzrCommandError.__init__(self, msg)
class MergeConflictHandler(ExceptionConflictHandler):
"""Handle conflicts encountered while merging"""
def __init__(self, dir, ignore_zero=False):
ExceptionConflictHandler.__init__(self, dir)
self.conflicts = 0
self.ignore_zero = ignore_zero
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)
return new_name
except OSError, e:
if e.errno != errno.EEXIST and e.errno != errno.ENOTEMPTY:
raise
return self.add_suffix(name, suffix, last_new_name=new_name)
def conflict(self, text):
warning(text)
self.conflicts += 1
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)
self.conflict("Diff3 conflict encountered in %s" % this_path)
def target_exists(self, entry, target, old_path):
"""Handle the case when the target file or dir exists"""
moved_path = self.add_suffix(target, ".moved")
self.conflict("Moved existing %s to %s" % (target, moved_path))
def finalize(self):
if not self.ignore_zero:
print "%d conflicts encountered.\n" % self.conflicts
class SourceFile(object):
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):
location, revno = treespec
branch = find_branch(location)
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 branch, 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,
check_clean=True, ignore_zero=False,
this_dir=None):
"""Merge changes into a tree.
base_revision
Base for three-way merge.
other_revision
Other revision for three-way merge.
this_dir
Directory to merge changes into; '.' by default.
check_clean
If true, this_dir must have no uncommitted changes before the
merge begins.
"""
tempdir = tempfile.mkdtemp(prefix="bzr-")
try:
if this_dir is None:
this_dir = '.'
this_branch = find_branch(this_dir)
if check_clean:
changes = compare_trees(this_branch.working_tree(),
this_branch.basis_tree(), False)
if changes.has_changed():
raise BzrCommandError("Working tree has uncommitted changes.")
other_branch, other_tree = get_tree(other_revision, tempdir, "other")
if base_revision == [None, None]:
if other_revision[1] == -1:
o_revno = None
else:
o_revno = other_revision[1]
base_revno = this_branch.common_ancestor(other_branch,
other_revno=o_revno)[0]
if base_revno is None:
raise UnrelatedBranches()
base_revision = ['.', base_revno]
base_branch, base_tree = get_tree(base_revision, tempdir, "base")
merge_inner(this_branch, other_tree, base_tree, tempdir,
ignore_zero=ignore_zero)
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,
ignore_zero=False):
this_tree = get_tree((this_branch.base, None), tempdir, "this")[1]
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,
ignore_zero=ignore_zero))
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
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