Mercurial > hg
annotate mercurial/dirstateguard.py @ 36160:9fd8c2a3db5a
narrowspec: move module into core
Having support for parsing the narrow specification in core is
necessary for moving many other parts of narrow to core.
We do still want to harmonize the narrow spec with the sparse
spec. And the format needs to be documented. But this shouldn't
hold up the code moving to core.
Differential Revision: https://phab.mercurial-scm.org/D2201
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 12 Feb 2018 16:21:34 -0800 |
parents | bbbbd3c30bfc |
children | ad24b581e4d9 |
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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 |
10263 | 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() |