Mercurial > hg
view mercurial/dirstateguard.py @ 33318:526255fe7899
sparse: clean up config signature code
Before, 0 was being used as the default signature value and we cast
the int to a string. We also handled I/O exceptions manually.
The new code uses cfs.tryread() so we always feed data into the
hasher. The empty string does hash and and should be suitable
for input into a cache key.
The changes made the code simple enough that the separate checksum
function could be inlined.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 06 Jul 2017 16:01:36 -0700 |
parents | 751639bf6fc4 |
children | ec306bc6915b |
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# dirstateguard.py - class to allow restoring dirstate after failure # # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import from .i18n import _ from . import ( error, ) class dirstateguard(object): '''Restore dirstate at unexpected failure. At the construction, this class does: - write current ``repo.dirstate`` out, and - save ``.hg/dirstate`` into the backup file This restores ``.hg/dirstate`` from backup file, if ``release()`` is invoked before ``close()``. This just removes the backup file at ``close()`` before ``release()``. ''' def __init__(self, repo, name): self._repo = repo self._active = False self._closed = False self._suffix = '.backup.%s.%d' % (name, id(self)) repo.dirstate.savebackup(repo.currenttransaction(), self._suffix) self._active = True def __del__(self): if self._active: # still active # this may occur, even if this class is used correctly: # for example, releasing other resources like transaction # may raise exception before ``dirstateguard.release`` in # ``release(tr, ....)``. self._abort() def close(self): if not self._active: # already inactivated msg = (_("can't close already inactivated backup: dirstate%s") % self._suffix) raise error.Abort(msg) self._repo.dirstate.clearbackup(self._repo.currenttransaction(), self._suffix) self._active = False self._closed = True def _abort(self): self._repo.dirstate.restorebackup(self._repo.currenttransaction(), self._suffix) self._active = False def release(self): if not self._closed: if not self._active: # already inactivated msg = (_("can't release already inactivated backup:" " dirstate%s") % self._suffix) raise error.Abort(msg) self._abort()