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  • Committer: Marius Kruger
  • Date: 2010-07-10 21:28:56 UTC
  • mto: (5384.1.1 integration)
  • mto: This revision was merged to the branch mainline in revision 5385.
  • Revision ID: marius.kruger@enerweb.co.za-20100710212856-uq4ji3go0u5se7hx
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bzrlib/atomicfile.py
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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from __future__ import absolute_import
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import os
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from bzrlib.lazy_import import lazy_import
 
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lazy_import(globals(), """
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import stat
 
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import socket
 
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import warnings
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from breezy import (
 
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from bzrlib import (
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    errors,
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    osutils,
 
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    symbol_versioning,
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    )
 
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""")
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# not forksafe - but we dont fork.
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_pid = os.getpid()
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_hostname = None
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class AtomicFileAlreadyClosed(errors.PathError):
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    _fmt = ('"%(function)s" called on an AtomicFile after it was closed:'
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            ' "%(path)s"')
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    def __init__(self, path, function):
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        errors.PathError.__init__(self, path=path, extra=None)
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        self.function = function
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class AtomicFile(object):
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    """A file that does an atomic-rename to move into place.
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        if new_mode is not None:
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            local_mode = new_mode
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        else:
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            local_mode = 0o666
 
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            local_mode = 0666
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        # Use a low level fd operation to avoid chmodding later.
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        # This may not succeed, but it should help most of the time
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            # the common case is that we won't, though.
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            st = os.fstat(self._fd)
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            if stat.S_IMODE(st.st_mode) != new_mode:
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                osutils.chmod_if_possible(self.tmpfilename, new_mode)
 
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                os.chmod(self.tmpfilename, new_mode)
 
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    def _get_closed(self):
 
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        symbol_versioning.warn('AtomicFile.closed deprecated in bzr 0.10',
 
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                               DeprecationWarning, stacklevel=2)
 
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        return self._fd is None
 
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    closed = property(_get_closed)
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    def __repr__(self):
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        return '%s(%r)' % (self.__class__.__name__,
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    def _close_tmpfile(self, func_name):
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        """Close the local temp file in preparation for commit or abort"""
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        if self._fd is None:
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            raise AtomicFileAlreadyClosed(path=self.realfilename,
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                                          function=func_name)
 
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            raise errors.AtomicFileAlreadyClosed(path=self.realfilename,
 
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                                                 function=func_name)
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        fd = self._fd
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        self._fd = None
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        os.close(fd)
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        if self._fd is not None:
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            self.abort()
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    def __enter__(self):
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        return self
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    def __exit__(self, exc_type, exc_val, exc_tb):
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        if exc_type:
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            self.abort()
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            return False
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        self.commit()
 
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    def __del__(self):
 
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        if self._fd is not None:
 
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            warnings.warn("%r leaked" % self)