44
"""This class represents the abstract storage layout for saving information.
38
class ImmutableStore(object):
39
"""Store that holds files indexed by unique names.
46
41
Files can be added, but not modified once they are in. Typically
47
42
the hash is used as the name, or something else known to be unique,
45
>>> st = ImmutableScratchStore()
47
>>> st.add(StringIO('hello'), 'aa')
53
You are not allowed to add an id that is already present.
55
Entries can be retrieved as files, which may then be read.
57
>>> st.add(StringIO('goodbye'), '123123')
58
>>> st['123123'].read()
61
TODO: Atomic add by writing to a temporary file and renaming.
63
In bzr 0.0.5 and earlier, files within the store were marked
64
readonly on disk. This is no longer done but existing stores need
52
raise NotImplementedError('Children should define their length')
54
def get(self, fileid, suffix=None):
55
"""Returns a file reading from a particular entry.
57
If suffix is present, retrieve the named suffix for fileid.
59
raise NotImplementedError
61
def __getitem__(self, fileid):
62
"""DEPRECATED. Please use .get(fileid) instead."""
63
raise NotImplementedError
66
raise NotImplementedError
68
def add(self, f, fileid):
69
"""Add a file object f to the store accessible from the given fileid"""
70
raise NotImplementedError('Children of Store must define their method of adding entries.')
72
def has_id(self, fileid, suffix=None):
73
"""Return True or false for the presence of fileid in the store.
75
suffix, if present, is a per file suffix, i.e. for digital signature
77
raise NotImplementedError
80
"""Return True if this store is able to be listed."""
81
return (getattr(self, "__iter__", None) is not None)
83
def copy_all_ids(self, store_from, pb=None):
84
"""Copy all the file ids from store_from into self."""
85
if not store_from.listable():
86
raise UnlistableStore(store_from)
88
for count, file_id in enumerate(store_from):
90
pb.update('listing files', count, count)
94
mutter('copy_all ids: %r', ids)
95
self.copy_multi(store_from, ids, pb=pb)
97
def copy_multi(self, other, ids, pb=None, permit_failure=False):
68
def __init__(self, basedir):
69
self._basedir = basedir
71
def _path(self, entry_id):
72
if not isinstance(entry_id, basestring):
73
raise TypeError(type(entry_id))
74
if '\\' in entry_id or '/' in entry_id:
75
raise ValueError("invalid store id %r" % entry_id)
76
return os.path.join(self._basedir, entry_id)
79
return "%s(%r)" % (self.__class__.__name__, self._basedir)
81
def add(self, f, fileid, compressed=True):
82
"""Add contents of a file into the store.
84
f -- An open file, or file-like object."""
85
# FIXME: Only works on files that will fit in memory
87
from bzrlib.atomicfile import AtomicFile
89
mutter("add store entry %r" % (fileid))
90
if isinstance(f, types.StringTypes):
95
p = self._path(fileid)
96
if os.access(p, os.F_OK) or os.access(p + '.gz', os.F_OK):
97
raise BzrError("store %r already contains id %r" % (self._basedir, fileid))
103
af = AtomicFile(fn, 'wb')
106
gf = gzip.GzipFile(mode='wb', fileobj=af)
116
def copy_multi(self, other, ids, permit_failure=False):
98
117
"""Copy texts for ids from other into self.
100
If an id is present in self, it is skipped. A count of copied
101
ids is returned, which may be less than len(ids).
119
If an id is present in self, it is skipped.
103
:param other: Another Store object
104
:param ids: A list of entry ids to be copied
105
:param pb: A ProgressBar object, if none is given, the default will be created.
106
:param permit_failure: Allow missing entries to be ignored
107
:return: (n_copied, [failed]) The number of entries copied successfully,
108
followed by a list of entries which could not be copied (because they
121
Returns (count_copied, failed), where failed is a collection of ids
122
that could not be copied.
112
pb.update('preparing to copy')
124
pb = bzrlib.ui.ui_factory.progress_bar()
126
pb.update('preparing to copy')
127
to_copy = [id for id in ids if id not in self]
128
if isinstance(other, ImmutableStore):
129
return self.copy_multi_immutable(other, to_copy, pb)
117
if self.has_id(fileid):
134
pb.update('copy', count, len(to_copy))
135
if not permit_failure:
136
self.add(other[id], id)
145
if not permit_failure:
146
assert count == len(to_copy)
150
def copy_multi_immutable(self, other, to_copy, pb, permit_failure=False):
151
from shutil import copyfile
156
other_p = other._path(id)
120
self._copy_one(fileid, None, other, pb)
121
for suffix in self._suffixes:
123
self._copy_one(fileid, suffix, other, pb)
127
pb.update('copy', count, len(ids))
160
if e.errno == errno.ENOENT:
161
if not permit_failure:
162
copyfile(other_p+".gz", p+".gz")
165
copyfile(other_p+".gz", p+".gz")
167
if e.errno == errno.ENOENT:
175
pb.update('copy', count, len(to_copy))
176
assert count == len(to_copy)
135
178
return count, failed
137
def _copy_one(self, fileid, suffix, other, pb):
138
"""Most generic copy-one object routine.
140
Subclasses can override this to provide an optimised
141
copy between their own instances. Such overriden routines
142
should call this if they have no optimised facility for a
145
mutter('Store._copy_one: %r', fileid)
146
f = other.get(fileid, suffix)
147
self.add(f, fileid, suffix)
150
class TransportStore(Store):
151
"""A TransportStore is a Store superclass for Stores that use Transports."""
153
def add(self, f, fileid, suffix=None):
154
"""Add contents of a file into the store.
156
f -- A file-like object
158
mutter("add store entry %r", fileid)
159
names = self._id_to_names(fileid, suffix)
160
if self._transport.has_any(names):
161
raise BzrError("store %r already contains id %r"
162
% (self._transport.base, fileid))
164
# Most of the time, just adding the file will work
165
# if we find a time where it fails, (because the dir
166
# doesn't exist), then create the dir, and try again
167
self._add(names[0], f)
169
def _add(self, relpath, f):
170
"""Actually add the file to the given location.
171
This should be overridden by children.
173
raise NotImplementedError('children need to implement this function.')
175
def _check_fileid(self, fileid):
176
if type(fileid) != str:
177
raise TypeError('Fileids should be bytestrings: %s %r' % (
178
type(fileid), fileid))
179
if '\\' in fileid or '/' in fileid:
180
raise ValueError("invalid store id %r" % fileid)
182
def _id_to_names(self, fileid, suffix):
183
"""Return the names in the expected order"""
184
if suffix is not None:
185
fn = self._relpath(fileid, [suffix])
187
fn = self._relpath(fileid)
189
# FIXME RBC 20051128 this belongs in TextStore.
196
def has_id(self, fileid, suffix=None):
197
"""See Store.has_id."""
198
return self._transport.has_any(self._id_to_names(fileid, suffix))
200
def _get_name(self, fileid, suffix=None):
201
"""A special check, which returns the name of an existing file.
203
This is similar in spirit to 'has_id', but it is designed
204
to return information about which file the store has.
206
for name in self._id_to_names(fileid, suffix=suffix):
207
if self._transport.has(name):
211
def _get(self, filename):
212
"""Return an vanilla file stream for clients to read from.
214
This is the body of a template method on 'get', and should be
215
implemented by subclasses.
217
raise NotImplementedError
219
def get(self, fileid, suffix=None):
220
"""See Store.get()."""
221
names = self._id_to_names(fileid, suffix)
224
return self._get(name)
225
except errors.NoSuchFile:
227
raise KeyError(fileid)
229
def __init__(self, a_transport, prefixed=False, compressed=False,
230
dir_mode=None, file_mode=None,
232
super(TransportStore, self).__init__()
233
self._transport = a_transport
234
self._prefixed = prefixed
235
# FIXME RBC 20051128 this belongs in TextStore.
236
self._compressed = compressed
237
self._suffixes = set()
238
self._escaped = escaped
240
# It is okay for these to be None, it just means they
241
# will just use the filesystem defaults
242
self._dir_mode = dir_mode
243
self._file_mode = file_mode
244
# Create a key mapper to use
245
if escaped and prefixed:
246
self._mapper = versionedfile.HashEscapedPrefixMapper()
247
elif not escaped and prefixed:
248
self._mapper = versionedfile.HashPrefixMapper()
251
"%r: escaped unprefixed stores are not permitted."
254
self._mapper = versionedfile.PrefixMapper()
256
def _iter_files_recursive(self):
257
"""Iterate through the files in the transport."""
258
for quoted_relpath in self._transport.iter_files_recursive():
181
def __contains__(self, fileid):
183
p = self._path(fileid)
184
return (os.access(p, os.R_OK)
185
or os.access(p + '.gz', os.R_OK))
187
# TODO: Guard against the same thing being stored twice, compressed and uncompresse
261
189
def __iter__(self):
262
for relpath in self._iter_files_recursive():
263
# worst case is one of each suffix.
264
name = os.path.basename(relpath)
265
if name.endswith('.gz'):
268
for count in range(len(self._suffixes)):
269
for suffix in self._suffixes:
270
if name.endswith('.' + suffix):
273
yield self._mapper.unmap(name)[0]
190
for f in os.listdir(self._basedir):
192
# TODO: case-insensitive?
275
197
def __len__(self):
276
return len(list(self.__iter__()))
278
def _relpath(self, fileid, suffixes=None):
279
self._check_fileid(fileid)
281
for suffix in suffixes:
282
if not suffix in self._suffixes:
283
raise ValueError("Unregistered suffix %r" % suffix)
284
self._check_fileid(suffix)
287
path = self._mapper.map((fileid,))
288
full_path = '.'.join([path] + suffixes)
292
if self._transport is None:
293
return "%s(None)" % (self.__class__.__name__)
295
return "%s(%r)" % (self.__class__.__name__, self._transport.base)
300
"""Return True if this store is able to be listed."""
301
return self._transport.listable()
303
def register_suffix(self, suffix):
304
"""Register a suffix as being expected in this store."""
305
self._check_fileid(suffix)
307
raise ValueError('You cannot register the "gz" suffix.')
308
self._suffixes.add(suffix)
198
return len(os.listdir(self._basedir))
201
def __getitem__(self, fileid):
202
"""Returns a file reading from a particular entry."""
203
p = self._path(fileid)
205
return gzip.GzipFile(p + '.gz', 'rb')
207
if e.errno != errno.ENOENT:
213
if e.errno != errno.ENOENT:
216
raise IndexError(fileid)
310
219
def total_size(self):
311
220
"""Return (count, bytes)
added
removed
bzrlib/store.py
