Mercurial > hg
view mercurial/dirstateguard.py @ 43870:66af68d4c751
pycompat: allow pycompat.sysbytes() even if input already is bytes
pycompat.sysstr() on py3 accepts an input that's already str
(i.e. unicode). This patch makes it so pycompat.sysbytes() on py3
accepts an input that's already bytes. Allowing that makes it possible
to do pycompat.sysbytes(fp.name) where fp.name is either bytes or
unicode, as we'll get when fp can come from either open() or
resources.open_binary().
Differential Revision: https://phab.mercurial-scm.org/D7621
author | Martin von Zweigbergk <martinvonz@google.com> |
---|---|
date | Thu, 12 Dec 2019 10:26:09 -0800 |
parents | 687b865b95ad |
children | 89a2afe31e82 |
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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, narrowspec, util, ) class dirstateguard(util.transactional): '''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._backupname = b'dirstate.backup.%s.%d' % (name, id(self)) self._narrowspecbackupname = b'narrowspec.backup.%s.%d' % ( name, id(self), ) repo.dirstate.savebackup(repo.currenttransaction(), self._backupname) narrowspec.savewcbackup(repo, self._narrowspecbackupname) 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 = ( _(b"can't close already inactivated backup: %s") % self._backupname ) raise error.Abort(msg) self._repo.dirstate.clearbackup( self._repo.currenttransaction(), self._backupname ) narrowspec.clearwcbackup(self._repo, self._narrowspecbackupname) self._active = False self._closed = True def _abort(self): narrowspec.restorewcbackup(self._repo, self._narrowspecbackupname) self._repo.dirstate.restorebackup( self._repo.currenttransaction(), self._backupname ) self._active = False def release(self): if not self._closed: if not self._active: # already inactivated msg = ( _(b"can't release already inactivated backup: %s") % self._backupname ) raise error.Abort(msg) self._abort()