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# Copyright (C) 2005 by Canonical Development Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A store that keeps the full text of every version.
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This store keeps uncompressed versions of the full text. It does not
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do any sort of delta compression.
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from bzrlib.store import hash_prefix
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from bzrlib.trace import mutter
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from bzrlib.errors import BzrError, NoSuchFile, FileExists
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from cStringIO import StringIO
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class TextStore(bzrlib.store.TransportStore):
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"""Store that holds files indexed by unique names.
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Files can be added, but not modified once they are in. Typically
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the hash is used as the name, or something else known to be unique,
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Files are stored uncompressed, with no delta compression.
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def _add_compressed(self, fn, f):
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from cStringIO import StringIO
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from bzrlib.osutils import pumpfile
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if isinstance(f, basestring):
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gf = gzip.GzipFile(mode='wb', fileobj=sio)
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# if pumpfile handles files that don't fit in ram,
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# so will this function
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self._try_put(fn, sio)
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def _add(self, fn, f):
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self._add_compressed(fn, f)
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def _try_put(self, fn, f):
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self._transport.put(fn, f)
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if not self._prefixed:
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self._transport.mkdir(os.path.dirname(fn))
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self._transport.put(fn, f)
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if fn.endswith('.gz'):
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return self._get_compressed(fn)
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return self._transport.get(fn)
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def _copy_one(self, fileid, suffix, other, pb):
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# TODO: Once the copy_to interface is improved to allow a source
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# and destination targets, then we can always do the copy
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# as long as other is a TextStore
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if not (isinstance(other, TextStore)
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and other._prefixed == self._prefixed):
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return super(TextStore, self)._copy_one(fileid, suffix, other, pb)
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mutter('_copy_one: %r, %r', fileid, suffix)
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path = other._get_name(fileid, suffix)
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raise KeyError(fileid + '-' + str(suffix))
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result = other._transport.copy_to([path], self._transport, pb=pb)
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if not self._prefixed:
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self._transport.mkdir(hash_prefix(fileid)[:-1])
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result = other._transport.copy_to([path], self._transport, pb=pb)
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raise BzrError('Unable to copy file: %r' % (path,))
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def _get_compressed(self, filename):
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"""Returns a file reading from a particular entry."""
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f = self._transport.get(filename)
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# gzip.GzipFile.read() requires a tell() function
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# but some transports return objects that cannot seek
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# so buffer them in a StringIO instead
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if hasattr(f, 'tell'):
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return gzip.GzipFile(mode='rb', fileobj=f)
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from cStringIO import StringIO
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sio = StringIO(f.read())
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return gzip.GzipFile(mode='rb', fileobj=sio)
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def ScratchTextStore():
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return TextStore(ScratchTransport())
added
removed
bzrlib/store/text.py
