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Make ShaFiles created from files trust their filenames.

This adds a dummy FixedSha class that implements the read-only part
of hashlib's hash interface but does not actually compute a SHA-1
digest. This allows us to assign ids to file objects based on their
filename rather than requiring a read of the whole file; SHA-1s will
soon be checked during check().

Added a filename_to_sha helper function to objects.py; refactored the
opposite sha_to_filename functionality into this file as well for
parallelism and testing. As a side effect, reorganized some files in
tests/data to have the normal 2/38 filename structure.

Change-Id: Ic459628aec32a92e29ea49cfd6cbe685053971ef

Changeset c866eded426f

Parent 79b760a98784

committed by Jelmer Vernooij

authored by Dave Borowitz

Changes to 11 files · Browse files at c866eded426f Showing diff from parent 79b760a98784 Diff from another changeset...

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 # object_store.py -- Object store for git objects  # Copyright (C) 2008-2009 Jelmer Vernooij <jelmer@samba.org>  #  # 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  # or (at your option) a later version of the License.  #  # 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., 51 Franklin Street, Fifth Floor, Boston,  # MA 02110-1301, USA.      """Git object store interfaces and implementation."""      import errno  import itertools  import os  import posixpath  import stat  import tempfile  import urllib2    from dulwich.errors import (   NotTreeError,   )  from dulwich.file import GitFile  from dulwich.objects import (   Commit,   ShaFile,   Tag,   Tree,   hex_to_sha,   sha_to_hex, + hex_to_filename,   S_ISGITLINK,   )  from dulwich.pack import (   Pack,   PackData,   iter_sha1,   load_pack_index,   write_pack,   write_pack_data,   write_pack_index_v2,   )    PACKDIR = 'pack'      class BaseObjectStore(object):   """Object store interface."""     def determine_wants_all(self, refs):   return [sha for (ref, sha) in refs.iteritems() if not sha in self and not ref.endswith("^{}")]     def iter_shas(self, shas):   """Iterate over the objects for the specified shas.     :param shas: Iterable object with SHAs   :return: Object iterator   """   return ObjectStoreIterator(self, shas)     def contains_loose(self, sha):   """Check if a particular object is present by SHA1 and is loose."""   raise NotImplementedError(self.contains_loose)     def contains_packed(self, sha):   """Check if a particular object is present by SHA1 and is packed."""   raise NotImplementedError(self.contains_packed)     def __contains__(self, sha):   """Check if a particular object is present by SHA1.     This method makes no distinction between loose and packed objects.   """   return self.contains_packed(sha) or self.contains_loose(sha)     @property   def packs(self):   """Iterable of pack objects."""   raise NotImplementedError     def get_raw(self, name):   """Obtain the raw text for an object.     :param name: sha for the object.   :return: tuple with numeric type and object contents.   """   raise NotImplementedError(self.get_raw)     def __getitem__(self, sha):   """Obtain an object by SHA1."""   type_num, uncomp = self.get_raw(sha)   return ShaFile.from_raw_string(type_num, uncomp)     def __iter__(self):   """Iterate over the SHAs that are present in this store."""   raise NotImplementedError(self.__iter__)     def add_object(self, obj):   """Add a single object to this object store.     """   raise NotImplementedError(self.add_object)     def add_objects(self, objects):   """Add a set of objects to this object store.     :param objects: Iterable over a list of objects.   """   raise NotImplementedError(self.add_objects)     def tree_changes(self, source, target, want_unchanged=False):   """Find the differences between the contents of two trees     :param object_store: Object store to use for retrieving tree contents   :param tree: SHA1 of the root tree   :param want_unchanged: Whether unchanged files should be reported   :return: Iterator over tuples with (oldpath, newpath), (oldmode, newmode), (oldsha, newsha)   """   todo = set([(source, target, "")])   while todo:   (sid, tid, path) = todo.pop()   if sid is not None:   stree = self[sid]   else:   stree = {}   if tid is not None:   ttree = self[tid]   else:   ttree = {}   for name, oldmode, oldhexsha in stree.iteritems():   oldchildpath = posixpath.join(path, name)   try:   (newmode, newhexsha) = ttree[name]   newchildpath = oldchildpath   except KeyError:   newmode = None   newhexsha = None   newchildpath = None   if (want_unchanged or oldmode != newmode or   oldhexsha != newhexsha):   if stat.S_ISDIR(oldmode):   if newmode is None or stat.S_ISDIR(newmode):   todo.add((oldhexsha, newhexsha, oldchildpath))   else:   # entry became a file   todo.add((oldhexsha, None, oldchildpath))   yield ((None, newchildpath), (None, newmode), (None, newhexsha))   else:   if newmode is not None and stat.S_ISDIR(newmode):   # entry became a dir   yield ((oldchildpath, None), (oldmode, None), (oldhexsha, None))   todo.add((None, newhexsha, newchildpath))   else:   yield ((oldchildpath, newchildpath), (oldmode, newmode), (oldhexsha, newhexsha))     for name, newmode, newhexsha in ttree.iteritems():   childpath = posixpath.join(path, name)   if not name in stree:   if not stat.S_ISDIR(newmode):   yield ((None, childpath), (None, newmode), (None, newhexsha))   else:   todo.add((None, newhexsha, childpath))     def iter_tree_contents(self, tree):   """Yield (path, mode, hexsha) tuples for all non-Tree objects in a tree.     :param tree: SHA1 of the root of the tree   """   todo = set([(tree, "")])   while todo:   (tid, tpath) = todo.pop()   tree = self[tid]   for name, mode, hexsha in tree.iteritems():   path = posixpath.join(tpath, name)   if stat.S_ISDIR(mode):   todo.add((hexsha, path))   else:   yield path, mode, hexsha     def find_missing_objects(self, haves, wants, progress=None,   get_tagged=None):   """Find the missing objects required for a set of revisions.     :param haves: Iterable over SHAs already in common.   :param wants: Iterable over SHAs of objects to fetch.   :param progress: Simple progress function that will be called with   updated progress strings.   :param get_tagged: Function that returns a dict of pointed-to sha -> tag   sha for including tags.   :return: Iterator over (sha, path) pairs.   """   finder = MissingObjectFinder(self, haves, wants, progress, get_tagged)   return iter(finder.next, None)     def find_common_revisions(self, graphwalker):   """Find which revisions this store has in common using graphwalker.     :param graphwalker: A graphwalker object.   :return: List of SHAs that are in common   """   haves = []   sha = graphwalker.next()   while sha:   if sha in self:   haves.append(sha)   graphwalker.ack(sha)   sha = graphwalker.next()   return haves     def get_graph_walker(self, heads):   """Obtain a graph walker for this object store.     :param heads: Local heads to start search with   :return: GraphWalker object   """   return ObjectStoreGraphWalker(heads, lambda sha: self[sha].parents)     def generate_pack_contents(self, have, want, progress=None):   """Iterate over the contents of a pack file.     :param have: List of SHA1s of objects that should not be sent   :param want: List of SHA1s of objects that should be sent   :param progress: Optional progress reporting method   """   return self.iter_shas(self.find_missing_objects(have, want, progress))      class PackBasedObjectStore(BaseObjectStore):     def __init__(self):   self._pack_cache = None     def contains_packed(self, sha):   """Check if a particular object is present by SHA1 and is packed."""   for pack in self.packs:   if sha in pack:   return True   return False     def _load_packs(self):   raise NotImplementedError(self._load_packs)     def _pack_cache_stale(self):   """Check whether the pack cache is stale."""   raise NotImplementedError(self._pack_cache_stale)     def _add_known_pack(self, pack):   """Add a newly appeared pack to the cache by path.     """   if self._pack_cache is not None:   self._pack_cache.append(pack)     @property   def packs(self):   """List with pack objects."""   if self._pack_cache is None or self._pack_cache_stale():   self._pack_cache = self._load_packs()   return self._pack_cache     def _iter_loose_objects(self):   raise NotImplementedError(self._iter_loose_objects)     def _get_loose_object(self, sha):   raise NotImplementedError(self._get_loose_object)     def __iter__(self):   """Iterate over the SHAs that are present in this store."""   iterables = self.packs + [self._iter_loose_objects()]   return itertools.chain(*iterables)     def contains_loose(self, sha):   """Check if a particular object is present by SHA1 and is loose."""   return self._get_loose_object(sha) is not None     def get_raw(self, name):   """Obtain the raw text for an object.     :param name: sha for the object.   :return: tuple with numeric type and object contents.   """   if len(name) == 40:   sha = hex_to_sha(name)   hexsha = name   elif len(name) == 20:   sha = name   hexsha = None   else:   raise AssertionError   for pack in self.packs:   try:   return pack.get_raw(sha)   except KeyError:   pass   if hexsha is None:   hexsha = sha_to_hex(name)   ret = self._get_loose_object(hexsha)   if ret is not None:   return ret.type_num, ret.as_raw_string()   raise KeyError(hexsha)     def add_objects(self, objects):   """Add a set of objects to this object store.     :param objects: Iterable over objects, should support __len__.   """   if len(objects) == 0:   # Don't bother writing an empty pack file   return   f, commit = self.add_pack()   write_pack_data(f, objects, len(objects))   commit()      class DiskObjectStore(PackBasedObjectStore):   """Git-style object store that exists on disk."""     def __init__(self, path):   """Open an object store.     :param path: Path of the object store.   """   super(DiskObjectStore, self).__init__()   self.path = path   self.pack_dir = os.path.join(self.path, PACKDIR)   self._pack_cache_time = 0     def _load_packs(self):   pack_files = []   try:   self._pack_cache_time = os.stat(self.pack_dir).st_mtime   pack_dir_contents = os.listdir(self.pack_dir)   for name in pack_dir_contents:   # TODO: verify that idx exists first   if name.startswith("pack-") and name.endswith(".pack"):   filename = os.path.join(self.pack_dir, name)   pack_files.append((os.stat(filename).st_mtime, filename))   except OSError, e:   if e.errno == errno.ENOENT:   return []   raise   pack_files.sort(reverse=True)   suffix_len = len(".pack")   return [Pack(f[:-suffix_len]) for _, f in pack_files]     def _pack_cache_stale(self):   try:   return os.stat(self.pack_dir).st_mtime > self._pack_cache_time   except OSError, e:   if e.errno == errno.ENOENT:   return True   raise     def _get_shafile_path(self, sha): - dir = sha[:2] - file = sha[2:]   # Check from object dir - return os.path.join(self.path, dir, file) + return hex_to_filename(self.path, sha)     def _iter_loose_objects(self):   for base in os.listdir(self.path):   if len(base) != 2:   continue   for rest in os.listdir(os.path.join(self.path, base)):   yield base+rest     def _get_loose_object(self, sha):   path = self._get_shafile_path(sha)   try:   return ShaFile.from_file(path)   except (OSError, IOError), e:   if e.errno == errno.ENOENT:   return None   raise     def move_in_thin_pack(self, path):   """Move a specific file containing a pack into the pack directory.     :note: The file should be on the same file system as the   packs directory.     :param path: Path to the pack file.   """   data = PackData(path)     # Write index for the thin pack (do we really need this?)   temppath = os.path.join(self.pack_dir,   sha_to_hex(urllib2.randombytes(20))+".tempidx")   data.create_index_v2(temppath, self.get_raw)   p = Pack.from_objects(data, load_pack_index(temppath))     # Write a full pack version   temppath = os.path.join(self.pack_dir,   sha_to_hex(urllib2.randombytes(20))+".temppack")   write_pack(temppath, ((o, None) for o in p.iterobjects(self.get_raw)),   len(p))   pack_sha = load_pack_index(temppath+".idx").objects_sha1()   newbasename = os.path.join(self.pack_dir, "pack-%s" % pack_sha)   os.rename(temppath+".pack", newbasename+".pack")   os.rename(temppath+".idx", newbasename+".idx")   self._add_known_pack(Pack(newbasename))     def move_in_pack(self, path):   """Move a specific file containing a pack into the pack directory.     :note: The file should be on the same file system as the   packs directory.     :param path: Path to the pack file.   """   p = PackData(path)   entries = p.sorted_entries()   basename = os.path.join(self.pack_dir,   "pack-%s" % iter_sha1(entry[0] for entry in entries))   write_pack_index_v2(basename+".idx", entries, p.get_stored_checksum())   p.close()   os.rename(path, basename + ".pack")   self._add_known_pack(Pack(basename))     def add_thin_pack(self):   """Add a new thin pack to this object store.     Thin packs are packs that contain deltas with parents that exist   in a different pack.   """   fd, path = tempfile.mkstemp(dir=self.pack_dir, suffix=".pack")   f = os.fdopen(fd, 'wb')   def commit():   os.fsync(fd)   f.close()   if os.path.getsize(path) > 0:   self.move_in_thin_pack(path)   return f, commit     def add_pack(self):   """Add a new pack to this object store.     :return: Fileobject to write to and a commit function to   call when the pack is finished.   """   fd, path = tempfile.mkstemp(dir=self.pack_dir, suffix=".pack")   f = os.fdopen(fd, 'wb')   def commit():   os.fsync(fd)   f.close()   if os.path.getsize(path) > 0:   self.move_in_pack(path)   return f, commit     def add_object(self, obj):   """Add a single object to this object store.     :param obj: Object to add   """   dir = os.path.join(self.path, obj.id[:2])   try:   os.mkdir(dir)   except OSError, e:   if e.errno != errno.EEXIST:   raise   path = os.path.join(dir, obj.id[2:])   if os.path.exists(path):   return # Already there, no need to write again   f = GitFile(path, 'wb')   try:   f.write(obj.as_legacy_object())   finally:   f.close()     @classmethod   def init(cls, path):   try:   os.mkdir(path)   except OSError, e:   if e.errno != errno.EEXIST:   raise   os.mkdir(os.path.join(path, "info"))   os.mkdir(os.path.join(path, PACKDIR))   return cls(path)      class MemoryObjectStore(BaseObjectStore):   """Object store that keeps all objects in memory."""     def __init__(self):   super(MemoryObjectStore, self).__init__()   self._data = {}     def contains_loose(self, sha):   """Check if a particular object is present by SHA1 and is loose."""   return sha in self._data     def contains_packed(self, sha):   """Check if a particular object is present by SHA1 and is packed."""   return False     def __iter__(self):   """Iterate over the SHAs that are present in this store."""   return self._data.iterkeys()     @property   def packs(self):   """List with pack objects."""   return []     def get_raw(self, name):   """Obtain the raw text for an object.     :param name: sha for the object.   :return: tuple with numeric type and object contents.   """   return self[name].as_raw_string()     def __getitem__(self, name):   return self._data[name]     def add_object(self, obj):   """Add a single object to this object store.     """   self._data[obj.id] = obj     def add_objects(self, objects):   """Add a set of objects to this object store.     :param objects: Iterable over a list of objects.   """   for obj, path in objects:   self._data[obj.id] = obj      class ObjectImporter(object):   """Interface for importing objects."""     def __init__(self, count):   """Create a new ObjectImporter.     :param count: Number of objects that's going to be imported.   """   self.count = count     def add_object(self, object):   """Add an object."""   raise NotImplementedError(self.add_object)     def finish(self, object):   """Finish the imoprt and write objects to disk."""   raise NotImplementedError(self.finish)      class ObjectIterator(object):   """Interface for iterating over objects."""     def iterobjects(self):   raise NotImplementedError(self.iterobjects)      class ObjectStoreIterator(ObjectIterator):   """ObjectIterator that works on top of an ObjectStore."""     def __init__(self, store, sha_iter):   """Create a new ObjectIterator.     :param store: Object store to retrieve from   :param sha_iter: Iterator over (sha, path) tuples   """   self.store = store   self.sha_iter = sha_iter   self._shas = []     def __iter__(self):   """Yield tuple with next object and path."""   for sha, path in self.itershas():   yield self.store[sha], path     def iterobjects(self):   """Iterate over just the objects."""   for o, path in self:   yield o     def itershas(self):   """Iterate over the SHAs."""   for sha in self._shas:   yield sha   for sha in self.sha_iter:   self._shas.append(sha)   yield sha     def __contains__(self, needle):   """Check if an object is present.     :note: This checks if the object is present in   the underlying object store, not if it would   be yielded by the iterator.     :param needle: SHA1 of the object to check for   """   return needle in self.store     def __getitem__(self, key):   """Find an object by SHA1.     :note: This retrieves the object from the underlying   object store. It will also succeed if the object would   not be returned by the iterator.   """   return self.store[key]     def __len__(self):   """Return the number of objects."""   return len(list(self.itershas()))      def tree_lookup_path(lookup_obj, root_sha, path):   """Lookup an object in a Git tree.     :param lookup_obj: Callback for retrieving object by SHA1   :param root_sha: SHA1 of the root tree   :param path: Path to lookup   """   parts = path.split("/")   sha = root_sha   mode = None   for p in parts:   obj = lookup_obj(sha)   if not isinstance(obj, Tree):   raise NotTreeError(sha)   if p == '':   continue   mode, sha = obj[p]   return mode, sha      class MissingObjectFinder(object):   """Find the objects missing from another object store.     :param object_store: Object store containing at least all objects to be   sent   :param haves: SHA1s of commits not to send (already present in target)   :param wants: SHA1s of commits to send   :param progress: Optional function to report progress to.   :param get_tagged: Function that returns a dict of pointed-to sha -> tag   sha for including tags.   :param tagged: dict of pointed-to sha -> tag sha for including tags   """     def __init__(self, object_store, haves, wants, progress=None,   get_tagged=None):   self.sha_done = set(haves)   self.objects_to_send = set([(w, None, False) for w in wants if w not in haves])   self.object_store = object_store   if progress is None:   self.progress = lambda x: None   else:   self.progress = progress   self._tagged = get_tagged and get_tagged() or {}     def add_todo(self, entries):   self.objects_to_send.update([e for e in entries if not e[0] in self.sha_done])     def parse_tree(self, tree):   self.add_todo([(sha, name, not stat.S_ISDIR(mode)) for (mode, name, sha) in tree.entries() if not S_ISGITLINK(mode)])     def parse_commit(self, commit):   self.add_todo([(commit.tree, "", False)])   self.add_todo([(p, None, False) for p in commit.parents])     def parse_tag(self, tag):   self.add_todo([(tag.object[1], None, False)])     def next(self):   if not self.objects_to_send:   return None   (sha, name, leaf) = self.objects_to_send.pop()   if not leaf:   o = self.object_store[sha]   if isinstance(o, Commit):   self.parse_commit(o)   elif isinstance(o, Tree):   self.parse_tree(o)   elif isinstance(o, Tag):   self.parse_tag(o)   if sha in self._tagged:   self.add_todo([(self._tagged[sha], None, True)])   self.sha_done.add(sha)   self.progress("counting objects: %d\r" % len(self.sha_done))   return (sha, name)      class ObjectStoreGraphWalker(object):   """Graph walker that finds out what commits are missing from an object   store.     :ivar heads: Revisions without descendants in the local repo   :ivar get_parents: Function to retrieve parents in the local repo   """     def __init__(self, local_heads, get_parents):   """Create a new instance.     :param local_heads: Heads to start search with   :param get_parents: Function for finding the parents of a SHA1.   """   self.heads = set(local_heads)   self.get_parents = get_parents   self.parents = {}     def ack(self, sha):   """Ack that a revision and its ancestors are present in the source."""   ancestors = set([sha])     # stop if we run out of heads to remove   while self.heads:   for a in ancestors:   if a in self.heads:   self.heads.remove(a)     # collect all ancestors   new_ancestors = set()   for a in ancestors:   if a in self.parents:   new_ancestors.update(self.parents[a])     # no more ancestors; stop   if not new_ancestors:   break     ancestors = new_ancestors     def next(self):   """Iterate over ancestors of heads in the target."""   if self.heads:   ret = self.heads.pop()   ps = self.get_parents(ret)   self.parents[ret] = ps   self.heads.update(ps)   return ret   return None
 
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@@ -84,6 +84,27 @@
  return binascii.unhexlify(hex)     +def hex_to_filename(path, hex): + """Takes a hex sha and returns its filename relative to the given path.""" + dir = hex[:2] + file = hex[2:] + # Check from object dir + return os.path.join(path, dir, file) + + +def filename_to_hex(filename): + """Takes an object filename and returns its corresponding hex sha.""" + # grab the last (up to) two path components + names = filename.rsplit(os.path.sep, 2)[-2:] + errmsg = "Invalid object filename: %s" % filename + assert len(names) == 2, errmsg + base, rest = names + assert len(base) == 2 and len(rest) == 38, errmsg + hex = base + rest + hex_to_sha(hex) + return hex + +  def serializable_property(name, docstring=None):   def set(obj, value):   obj._ensure_parsed() @@ -120,6 +141,20 @@
  or identity.find(">", email_end + 1) >= 0   or not identity.endswith(">")):   raise ObjectFormatException(error_msg) + + +class FixedSha(object): + """SHA object that behaves like hashlib's but is given a fixed value.""" + + def __init__(self, hexsha): + self._hexsha = hexsha + self._sha = hex_to_sha(hexsha) + + def digest(self): + return self._sha + + def hexdigest(self): + return self._hexsha      class ShaFile(object): @@ -282,6 +317,7 @@
  try:   try:   obj = cls._parse_file_header(f) + obj._sha = FixedSha(filename_to_hex(filename))   obj._needs_parsing = True   obj._needs_serialization = True   return obj
Show Entire File dulwich/​tests/​data/​blobs/​6f/​670c0fb53f9463760b7295fbb814e965fb20c8 Stacked
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@@ -38,6 +38,7 @@
  Tag,   format_timezone,   hex_to_sha, + hex_to_filename,   check_hexsha,   check_identity,   parse_timezone, @@ -89,11 +90,11 @@
   class BlobReadTests(unittest.TestCase):   """Test decompression of blobs""" - - def get_sha_file(self, obj, base, sha): - return obj.from_file(os.path.join(os.path.dirname(__file__), - 'data', base, sha)) - + + def get_sha_file(self, cls, base, sha): + dir = os.path.join(os.path.dirname(__file__), 'data', base) + return cls.from_file(hex_to_filename(dir, sha)) +   def get_blob(self, sha):   """Return the blob named sha from the test data dir"""   return self.get_sha_file(Blob, 'blobs', sha) @@ -406,8 +407,8 @@
  self.assertEquals(["a.c", "a", "a/c"], [p[0] for p in x.iteritems()])     def _do_test_parse_tree(self, parse_tree): - o = Tree.from_file(os.path.join(os.path.dirname(__file__), 'data', - 'trees', tree_sha)) + dir = os.path.join(os.path.dirname(__file__), 'data', 'trees') + o = Tree.from_file(hex_to_filename(dir, tree_sha))   o._parse_file()   self.assertEquals([('a', 0100644, a_sha), ('b', 0100644, b_sha)],   list(parse_tree(o.as_raw_string())))