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# Copyright (C) 2005 Canonical Ltd
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Tree classes, representing directory at point in time.
"""
from sets import Set
import os.path, os, fnmatch
from osutils import pumpfile, filesize, quotefn, sha_file, \
joinpath, splitpath, appendpath, isdir, isfile, file_kind, fingerprint_file
import errno
from stat import S_ISREG, S_ISDIR, ST_MODE, ST_SIZE
from inventory import Inventory
from trace import mutter, note
from errors import bailout
import branch
import bzrlib
class Tree:
"""Abstract file tree.
There are several subclasses:
* `WorkingTree` exists as files on disk editable by the user.
* `RevisionTree` is a tree as recorded at some point in the past.
* `EmptyTree`
Trees contain an `Inventory` object, and also know how to retrieve
file texts mentioned in the inventory, either from a working
directory or from a store.
It is possible for trees to contain files that are not described
in their inventory or vice versa; for this use `filenames()`.
Trees can be compared, etc, regardless of whether they are working
trees or versioned trees.
"""
def has_filename(self, filename):
"""True if the tree has given filename."""
raise NotImplementedError()
def has_id(self, file_id):
return self.inventory.has_id(file_id)
__contains__ = has_id
def id_set(self):
"""Return set of all ids in this tree."""
return self.inventory.id_set()
def __iter__(self):
return iter(self.inventory)
def id2path(self, file_id):
return self.inventory.id2path(file_id)
def _get_inventory(self):
return self._inventory
inventory = property(_get_inventory,
doc="Inventory of this Tree")
def _check_retrieved(self, ie, f):
fp = fingerprint_file(f)
f.seek(0)
if ie.text_size != None:
if ie.text_size != fp['size']:
bailout("mismatched size for file %r in %r" % (ie.file_id, self._store),
["inventory expects %d bytes" % ie.text_size,
"file is actually %d bytes" % fp['size'],
"store is probably damaged/corrupt"])
if ie.text_sha1 != fp['sha1']:
bailout("wrong SHA-1 for file %r in %r" % (ie.file_id, self._store),
["inventory expects %s" % ie.text_sha1,
"file is actually %s" % fp['sha1'],
"store is probably damaged/corrupt"])
def print_file(self, fileid):
"""Print file with id `fileid` to stdout."""
import sys
pumpfile(self.get_file(fileid), sys.stdout)
def export(self, dest):
"""Export this tree to a new directory.
`dest` should not exist, and will be created holding the
contents of this tree.
TODO: To handle subdirectories we need to create the
directories first.
:note: If the export fails, the destination directory will be
left in a half-assed state.
"""
os.mkdir(dest)
mutter('export version %r' % self)
inv = self.inventory
for dp, ie in inv.iter_entries():
kind = ie.kind
fullpath = appendpath(dest, dp)
if kind == 'directory':
os.mkdir(fullpath)
elif kind == 'file':
pumpfile(self.get_file(ie.file_id), file(fullpath, 'wb'))
else:
bailout("don't know how to export {%s} of kind %r" % (ie.file_id, kind))
mutter(" export {%s} kind %s to %s" % (ie.file_id, kind, fullpath))
class RevisionTree(Tree):
"""Tree viewing a previous revision.
File text can be retrieved from the text store.
TODO: Some kind of `__repr__` method, but a good one
probably means knowing the branch and revision number,
or at least passing a description to the constructor.
"""
def __init__(self, store, inv):
self._store = store
self._inventory = inv
def get_file(self, file_id):
ie = self._inventory[file_id]
f = self._store[ie.text_id]
mutter(" get fileid{%s} from %r" % (file_id, self))
self._check_retrieved(ie, f)
return f
def get_file_size(self, file_id):
return self._inventory[file_id].text_size
def get_file_sha1(self, file_id):
ie = self._inventory[file_id]
return ie.text_sha1
def has_filename(self, filename):
return bool(self.inventory.path2id(filename))
def list_files(self):
# The only files returned by this are those from the version
for path, entry in self.inventory.iter_entries():
yield path, 'V', entry.kind, entry.file_id
class EmptyTree(Tree):
def __init__(self):
self._inventory = Inventory()
def has_filename(self, filename):
return False
def list_files(self):
if False: # just to make it a generator
yield None
######################################################################
# diff
# TODO: Merge these two functions into a single one that can operate
# on either a whole tree or a set of files.
# TODO: Return the diff in order by filename, not by category or in
# random order. Can probably be done by lock-stepping through the
# filenames from both trees.
def file_status(filename, old_tree, new_tree):
"""Return single-letter status, old and new names for a file.
The complexity here is in deciding how to represent renames;
many complex cases are possible.
"""
old_inv = old_tree.inventory
new_inv = new_tree.inventory
new_id = new_inv.path2id(filename)
old_id = old_inv.path2id(filename)
if not new_id and not old_id:
# easy: doesn't exist in either; not versioned at all
if new_tree.is_ignored(filename):
return 'I', None, None
else:
return '?', None, None
elif new_id:
# There is now a file of this name, great.
pass
else:
# There is no longer a file of this name, but we can describe
# what happened to the file that used to have
# this name. There are two possibilities: either it was
# deleted entirely, or renamed.
assert old_id
if new_inv.has_id(old_id):
return 'X', old_inv.id2path(old_id), new_inv.id2path(old_id)
else:
return 'D', old_inv.id2path(old_id), None
# if the file_id is new in this revision, it is added
if new_id and not old_inv.has_id(new_id):
return 'A'
# if there used to be a file of this name, but that ID has now
# disappeared, it is deleted
if old_id and not new_inv.has_id(old_id):
return 'D'
return 'wtf?'
def find_renames(old_inv, new_inv):
for file_id in old_inv:
if file_id not in new_inv:
continue
old_name = old_inv.id2path(file_id)
new_name = new_inv.id2path(file_id)
if old_name != new_name:
yield (old_name, new_name)
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