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Viewing changes to bzrlib/atomicfile.py

  • Committer: John Arbash Meinel
  • Date: 2006-10-16 01:25:46 UTC
  • mfrom: (2071 +trunk)
  • mto: This revision was merged to the branch mainline in revision 2080.
  • Revision ID: john@arbash-meinel.com-20061016012546-d01a0740671b4d73
[merge] bzr.dev

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bzrlib/atomicfile.py
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import codecs
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import errno
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import os
 
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import sys
 
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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 sys
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import warnings
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from bzrlib import (
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    osutils,
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    symbol_versioning,
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    )
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from bzrlib.osutils import rename
 
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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 = socket.gethostname()
 
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_hostname = None
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class AtomicFile(object):
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    __slots__ = ['tmpfilename', 'realfilename', '_fd']
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    def __init__(self, filename, mode='wb', new_mode=None):
 
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        global _hostname
 
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        self._fd = None
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        assert mode in ('wb', 'wt'), \
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            "invalid AtomicFile mode %r" % mode
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        if _hostname is None:
 
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            _hostname = socket.gethostname()
 
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        self.tmpfilename = '%s.%d.%s.tmp' % (filename, _pid, _hostname)
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        self.realfilename = filename
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    def commit(self):
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        """Close the file and move to final name."""
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        self._close_tmpfile('commit')
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        rename(self.tmpfilename, self.realfilename)
 
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        osutils.rename(self.tmpfilename, self.realfilename)
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    def abort(self):
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        """Discard temporary file without committing changes."""