author | Gregory Szorc <gregory.szorc@gmail.com> |
Sun, 11 Mar 2018 16:29:54 -0700 | |
changeset 36917 | f0a851542a05 |
parent 33814 | bbbbd3c30bfc |
child 38908 | ad24b581e4d9 |
permissions | -rw-r--r-- |
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# dirstateguard.py - class to allow restoring dirstate after failure |
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# |
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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from .i18n import _ |
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from . import ( |
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error, |
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util, |
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) |
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class dirstateguard(util.transactional): |
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'''Restore dirstate at unexpected failure. |
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At the construction, this class does: |
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- write current ``repo.dirstate`` out, and |
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- save ``.hg/dirstate`` into the backup file |
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This restores ``.hg/dirstate`` from backup file, if ``release()`` |
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is invoked before ``close()``. |
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This just removes the backup file at ``close()`` before ``release()``. |
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''' |
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def __init__(self, repo, name): |
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self._repo = repo |
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self._active = False |
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self._closed = False |
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self._backupname = 'dirstate.backup.%s.%d' % (name, id(self)) |
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repo.dirstate.savebackup(repo.currenttransaction(), self._backupname) |
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self._active = True |
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def __del__(self): |
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if self._active: # still active |
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# this may occur, even if this class is used correctly: |
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# for example, releasing other resources like transaction |
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# may raise exception before ``dirstateguard.release`` in |
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# ``release(tr, ....)``. |
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self._abort() |
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def close(self): |
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if not self._active: # already inactivated |
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msg = (_("can't close already inactivated backup: %s") |
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% self._backupname) |
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raise error.Abort(msg) |
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self._repo.dirstate.clearbackup(self._repo.currenttransaction(), |
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self._backupname) |
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self._active = False |
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self._closed = True |
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def _abort(self): |
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self._repo.dirstate.restorebackup(self._repo.currenttransaction(), |
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self._backupname) |
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self._active = False |
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def release(self): |
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if not self._closed: |
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if not self._active: # already inactivated |
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msg = (_("can't release already inactivated backup: %s") |
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% self._backupname) |
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raise error.Abort(msg) |
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self._abort() |