15
14
# along with this program; if not, write to the Free Software
16
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
"""Stores are the main data-storage mechanism for Bazaar-NG.
18
Stores are the main data-storage mechanism for Bazaar-NG.
20
20
A store is a simple write-once container indexed by a universally
21
unique ID, which is typically the SHA-1 of the content."""
23
__copyright__ = "Copyright (C) 2005 Canonical Ltd."
24
__author__ = "Martin Pool <mbp@canonical.com>"
26
24
import os, tempfile, types, osutils, gzip, errno
27
25
from stat import ST_SIZE
28
26
from StringIO import StringIO
29
from trace import mutter
27
from bzrlib.errors import BzrError
28
from bzrlib.trace import mutter
31
31
######################################################################
58
58
>>> st['123123'].read()
61
:todo: Atomic add by writing to a temporary file and renaming.
63
:todo: Perhaps automatically transform to/from XML in a method?
64
Would just need to tell the constructor what class to
67
:todo: Even within a simple disk store like this, we could
68
gzip the files. But since many are less than one disk
69
block, that might not help a lot.
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
73
68
def __init__(self, basedir):
74
"""ImmutableStore constructor."""
75
69
self._basedir = basedir
78
return os.path.join(self._basedir, id)
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)
80
78
def __repr__(self):
81
79
return "%s(%r)" % (self.__class__.__name__, self._basedir)
83
81
def add(self, f, fileid, compressed=True):
84
82
"""Add contents of a file into the store.
86
:param f: An open file, or file-like object."""
87
# FIXME: Only works on smallish files
88
# TODO: Can be optimized by copying at the same time as
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
90
89
mutter("add store entry %r" % (fileid))
91
90
if isinstance(f, types.StringTypes):
96
95
p = self._path(fileid)
97
96
if os.access(p, os.F_OK) or os.access(p + '.gz', os.F_OK):
98
bailout("store %r already contains id %r" % (self._basedir, fileid))
97
raise BzrError("store %r already contains id %r" % (self._basedir, fileid))
101
f = gzip.GzipFile(p + '.gz', 'wb')
102
os.chmod(p + '.gz', 0444)
103
af = AtomicFile(fn, 'wb')
106
gf = gzip.GzipFile(mode='wb', fileobj=af)
116
def copy_multi(self, other, ids, permit_failure=False):
117
"""Copy texts for ids from other into self.
119
If an id is present in self, it is skipped.
121
Returns (count_copied, failed), where failed is a collection of ids
122
that could not be copied.
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,
130
permit_failure=permit_failure)
135
pb.update('copy', count, len(to_copy))
136
if not permit_failure:
137
self.add(other[id], id)
146
if not permit_failure:
147
assert count == len(to_copy)
151
def copy_multi_immutable(self, other, to_copy, pb, permit_failure=False):
152
from shutil import copyfile
157
other_p = other._path(id)
161
if e.errno == errno.ENOENT:
162
if not permit_failure:
163
copyfile(other_p+".gz", p+".gz")
166
copyfile(other_p+".gz", p+".gz")
168
if e.errno == errno.ENOENT:
176
pb.update('copy', count, len(to_copy))
177
assert count == len(to_copy)
111
182
def __contains__(self, fileid):
127
198
def __len__(self):
128
199
return len(os.listdir(self._basedir))
130
202
def __getitem__(self, fileid):
131
203
"""Returns a file reading from a particular entry."""
132
204
p = self._path(fileid)
134
206
return gzip.GzipFile(p + '.gz', 'rb')
135
207
except IOError, e:
136
if e.errno == errno.ENOENT:
208
if e.errno != errno.ENOENT:
214
if e.errno != errno.ENOENT:
217
raise KeyError(fileid)
141
220
def total_size(self):
142
221
"""Return (count, bytes)
162
241
"""Self-destructing test subclass of ImmutableStore.
164
243
The Store only exists for the lifetime of the Python object.
165
Obviously you should not put anything precious in it.
244
Obviously you should not put anything precious in it.
167
246
def __init__(self):
168
247
ImmutableStore.__init__(self, tempfile.mkdtemp())
170
249
def __del__(self):
171
250
for f in os.listdir(self._basedir):
172
os.remove(os.path.join(self._basedir, f))
251
fpath = os.path.join(self._basedir, f)
252
# needed on windows, and maybe some other filesystems
253
os.chmod(fpath, 0600)
173
255
os.rmdir(self._basedir)
174
256
mutter("%r destroyed" % self)