1
# Copyright (C) 2005 by Canonical Development Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
"""A store that keeps the full text of every version.
19
This store keeps uncompressed versions of the full text. It does not
20
do any sort of delta compression.
25
from bzrlib.trace import mutter
26
from bzrlib.errors import BzrError, NoSuchFile, FileExists
29
from cStringIO import StringIO
32
class TextStore(bzrlib.store.TransportStore):
33
"""Store that holds files indexed by unique names.
35
Files can be added, but not modified once they are in. Typically
36
the hash is used as the name, or something else known to be unique,
39
Files are stored uncompressed, with no delta compression.
42
def _add_compressed(self, fn, f):
43
from cStringIO import StringIO
44
from bzrlib.osutils import pumpfile
46
if isinstance(f, basestring):
50
gf = gzip.GzipFile(mode='wb', fileobj=sio)
51
# if pumpfile handles files that don't fit in ram,
52
# so will this function
56
self._try_put(fn, sio)
58
def _add(self, fn, f):
60
self._add_compressed(fn, f)
64
def _try_put(self, fn, f):
66
self._transport.put(fn, f, mode=self._file_mode)
68
if not self._prefixed:
71
self._transport.mkdir(os.path.dirname(fn), mode=self._dir_mode)
74
self._transport.put(fn, f, mode=self._file_mode)
77
if fn.endswith('.gz'):
78
return self._get_compressed(fn)
80
return self._transport.get(fn)
82
def _copy_one(self, fileid, suffix, other, pb):
83
# TODO: Once the copy_to interface is improved to allow a source
84
# and destination targets, then we can always do the copy
85
# as long as other is a TextStore
86
if not (isinstance(other, TextStore)
87
and other._prefixed == self._prefixed):
88
return super(TextStore, self)._copy_one(fileid, suffix, other, pb)
90
mutter('_copy_one: %r, %r', fileid, suffix)
91
path = other._get_name(fileid, suffix)
93
raise KeyError(fileid + '-' + str(suffix))
96
result = other._transport.copy_to([path], self._transport,
99
if not self._prefixed:
102
self._transport.mkdir(self.hash_prefix(fileid)[:-1], mode=self._dir_mode)
105
result = other._transport.copy_to([path], self._transport,
106
mode=self._file_mode)
109
raise BzrError('Unable to copy file: %r' % (path,))
111
def _get_compressed(self, filename):
112
"""Returns a file reading from a particular entry."""
113
f = self._transport.get(filename)
114
# gzip.GzipFile.read() requires a tell() function
115
# but some transports return objects that cannot seek
116
# so buffer them in a StringIO instead
117
if hasattr(f, 'tell'):
118
return gzip.GzipFile(mode='rb', fileobj=f)
120
from cStringIO import StringIO
121
sio = StringIO(f.read())
122
return gzip.GzipFile(mode='rb', fileobj=sio)
added
removed
bzrlib/store/text.py
