annotate mercurial/dirstateguard.py @ 35997:24f05489377b

rebase: make "successors" a set in _computeobsoletenotrebased() There's no apparent reason for this variable to be a list and this avoids converting it to a set when needed.
author Denis Laxalde <denis@laxalde.org>
date Sat, 10 Feb 2018 19:33:19 +0100
parents bbbbd3c30bfc
children ad24b581e4d9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # dirstateguard.py - class to allow restoring dirstate after failure
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2 #
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 from .i18n import _
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11
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12 from . import (
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13 error,
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14 util,
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15 )
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16
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17 class dirstateguard(util.transactional):
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18 '''Restore dirstate at unexpected failure.
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19
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20 At the construction, this class does:
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21
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22 - write current ``repo.dirstate`` out, and
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23 - save ``.hg/dirstate`` into the backup file
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24
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25 This restores ``.hg/dirstate`` from backup file, if ``release()``
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26 is invoked before ``close()``.
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27
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28 This just removes the backup file at ``close()`` before ``release()``.
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29 '''
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30
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31 def __init__(self, repo, name):
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32 self._repo = repo
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33 self._active = False
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34 self._closed = False
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35 self._backupname = 'dirstate.backup.%s.%d' % (name, id(self))
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36 repo.dirstate.savebackup(repo.currenttransaction(), self._backupname)
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37 self._active = True
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38
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39 def __del__(self):
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40 if self._active: # still active
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41 # this may occur, even if this class is used correctly:
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42 # for example, releasing other resources like transaction
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43 # may raise exception before ``dirstateguard.release`` in
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44 # ``release(tr, ....)``.
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45 self._abort()
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46
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47 def close(self):
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48 if not self._active: # already inactivated
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49 msg = (_("can't close already inactivated backup: %s")
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50 % self._backupname)
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51 raise error.Abort(msg)
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52
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53 self._repo.dirstate.clearbackup(self._repo.currenttransaction(),
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54 self._backupname)
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55 self._active = False
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56 self._closed = True
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57
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58 def _abort(self):
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59 self._repo.dirstate.restorebackup(self._repo.currenttransaction(),
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60 self._backupname)
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61 self._active = False
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62
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63 def release(self):
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64 if not self._closed:
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65 if not self._active: # already inactivated
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66 msg = (_("can't release already inactivated backup: %s")
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67 % self._backupname)
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68 raise error.Abort(msg)
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69 self._abort()