14
14
# along with this program; if not, write to the Free Software
15
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
"""Stores are the main data-storage mechanism for Bazaar-NG.
18
Stores are the main data-storage mechanism for Bazaar-NG.
19
20
A store is a simple write-once container indexed by a universally
20
unique ID, which is typically the SHA-1 of the content."""
22
__copyright__ = "Copyright (C) 2005 Canonical Ltd."
23
__author__ = "Martin Pool <mbp@canonical.com>"
25
24
import os, tempfile, types, osutils, gzip, errno
26
25
from stat import ST_SIZE
60
59
TODO: Atomic add by writing to a temporary file and renaming.
62
TODO: Perhaps automatically transform to/from XML in a method?
63
Would just need to tell the constructor what class to
66
TODO: Even within a simple disk store like this, we could
67
gzip the files. But since many are less than one disk
68
block, that might not help a lot.
61
In bzr 0.0.5 and earlier, files within the store were marked
62
readonly on disk. This is no longer done but existing stores need
72
66
def __init__(self, basedir):
73
"""ImmutableStore constructor."""
74
67
self._basedir = basedir
76
69
def _path(self, id):
70
if '\\' in id or '/' in id:
71
raise ValueError("invalid store id %r" % id)
77
72
return os.path.join(self._basedir, id)
79
74
def __repr__(self):
83
78
"""Add contents of a file into the store.
85
80
f -- An open file, or file-like object."""
86
# FIXME: Only works on smallish files
87
# TODO: Can be optimized by copying at the same time as
81
# FIXME: Only works on files that will fit in memory
83
from bzrlib.atomicfile import AtomicFile
89
85
mutter("add store entry %r" % (fileid))
90
86
if isinstance(f, types.StringTypes):
95
91
p = self._path(fileid)
96
92
if os.access(p, os.F_OK) or os.access(p + '.gz', os.F_OK):
97
bailout("store %r already contains id %r" % (self._basedir, fileid))
93
raise BzrError("store %r already contains id %r" % (self._basedir, fileid))
100
f = gzip.GzipFile(p + '.gz', 'wb')
101
os.chmod(p + '.gz', 0444)
99
af = AtomicFile(fn, 'wb')
102
gf = gzip.GzipFile(mode='wb', fileobj=af)
112
def copy_multi(self, other, ids):
113
"""Copy texts for ids from other into self.
115
If an id is present in self, it is skipped. A count of copied
116
ids is returned, which may be less than len(ids).
118
from bzrlib.progress import ProgressBar
120
pb.update('preparing to copy')
121
to_copy = [id for id in ids if id not in self]
125
pb.update('copy', count, len(to_copy))
126
self.add(other[id], id)
127
assert count == len(to_copy)
110
132
def __contains__(self, fileid):
161
183
"""Self-destructing test subclass of ImmutableStore.
163
185
The Store only exists for the lifetime of the Python object.
164
Obviously you should not put anything precious in it.
186
Obviously you should not put anything precious in it.
166
188
def __init__(self):
167
189
ImmutableStore.__init__(self, tempfile.mkdtemp())