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# dirstateguard.py - class to allow restoring dirstate after failure
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#
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# Copyright 2005-2007 Olivia Mackall <olivia@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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import os
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from .i18n import _
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from . import (
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error,
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narrowspec,
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requirements,
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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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def getname(prefix):
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fd, fname = repo.vfs.mkstemp(prefix=prefix)
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os.close(fd)
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return fname
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self._backupname = getname(b'dirstate.backup.%s.' % name)
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repo.dirstate.savebackup(repo.currenttransaction(), self._backupname)
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# Don't make this the empty string, things may join it with stuff and
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# blindly try to unlink it, which could be bad.
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self._narrowspecbackupname = None
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if requirements.NARROW_REQUIREMENT in repo.requirements:
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self._narrowspecbackupname = getname(
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b'narrowspec.backup.%s.' % name
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)
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narrowspec.savewcbackup(repo, self._narrowspecbackupname)
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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 = (
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_(b"can't close already inactivated backup: %s")
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% self._backupname
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)
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raise error.Abort(msg)
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self._repo.dirstate.clearbackup(
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self._repo.currenttransaction(), self._backupname
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)
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if self._narrowspecbackupname:
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narrowspec.clearwcbackup(self._repo, self._narrowspecbackupname)
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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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if self._narrowspecbackupname:
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narrowspec.restorewcbackup(self._repo, self._narrowspecbackupname)
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self._repo.dirstate.restorebackup(
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self._repo.currenttransaction(), self._backupname
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)
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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 = (
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_(b"can't release already inactivated backup: %s")
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% self._backupname
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)
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raise error.Abort(msg)
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self._abort()
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