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@@ -1,84 +1,97 b'' | |||
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1 | 1 | # dirstateguard.py - class to allow restoring dirstate after failure |
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2 | 2 | # |
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3 | 3 | # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms of the |
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6 | 6 | # GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | from __future__ import absolute_import |
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9 | 9 | |
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10 | import os | |
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10 | 11 | from .i18n import _ |
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11 | 12 | |
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12 | 13 | from . import ( |
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13 | 14 | error, |
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14 | 15 | narrowspec, |
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16 | requirements, | |
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15 | 17 | util, |
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16 | 18 | ) |
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17 | 19 | |
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18 | 20 | |
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19 | 21 | class dirstateguard(util.transactional): |
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20 | 22 | """Restore dirstate at unexpected failure. |
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21 | 23 | |
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22 | 24 | At the construction, this class does: |
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23 | 25 | |
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24 | 26 | - write current ``repo.dirstate`` out, and |
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25 | 27 | - save ``.hg/dirstate`` into the backup file |
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26 | 28 | |
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27 | 29 | This restores ``.hg/dirstate`` from backup file, if ``release()`` |
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28 | 30 | is invoked before ``close()``. |
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29 | 31 | |
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30 | 32 | This just removes the backup file at ``close()`` before ``release()``. |
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31 | 33 | """ |
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32 | 34 | |
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33 | 35 | def __init__(self, repo, name): |
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34 | 36 | self._repo = repo |
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35 | 37 | self._active = False |
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36 | 38 | self._closed = False |
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37 | self._backupname = b'dirstate.backup.%s.%d' % (name, id(self)) | |
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38 | self._narrowspecbackupname = b'narrowspec.backup.%s.%d' % ( | |
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39 | name, | |
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40 |
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41 | ) | |
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39 | ||
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40 | def getname(prefix): | |
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41 | fd, fname = repo.vfs.mkstemp(prefix=prefix) | |
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42 | os.close(fd) | |
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43 | return fname | |
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44 | ||
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45 | self._backupname = getname(b'dirstate.backup.%s.' % name) | |
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42 | 46 | repo.dirstate.savebackup(repo.currenttransaction(), self._backupname) |
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43 | narrowspec.savewcbackup(repo, self._narrowspecbackupname) | |
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47 | # Don't make this the empty string, things may join it with stuff and | |
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48 | # blindly try to unlink it, which could be bad. | |
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49 | self._narrowspecbackupname = None | |
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50 | if requirements.NARROW_REQUIREMENT in repo.requirements: | |
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51 | self._narrowspecbackupname = getname( | |
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52 | b'narrowspec.backup.%s.' % name | |
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53 | ) | |
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54 | narrowspec.savewcbackup(repo, self._narrowspecbackupname) | |
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44 | 55 | self._active = True |
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45 | 56 | |
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46 | 57 | def __del__(self): |
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47 | 58 | if self._active: # still active |
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48 | 59 | # this may occur, even if this class is used correctly: |
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49 | 60 | # for example, releasing other resources like transaction |
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50 | 61 | # may raise exception before ``dirstateguard.release`` in |
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51 | 62 | # ``release(tr, ....)``. |
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52 | 63 | self._abort() |
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53 | 64 | |
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54 | 65 | def close(self): |
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55 | 66 | if not self._active: # already inactivated |
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56 | 67 | msg = ( |
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57 | 68 | _(b"can't close already inactivated backup: %s") |
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58 | 69 | % self._backupname |
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59 | 70 | ) |
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60 | 71 | raise error.Abort(msg) |
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61 | 72 | |
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62 | 73 | self._repo.dirstate.clearbackup( |
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63 | 74 | self._repo.currenttransaction(), self._backupname |
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64 | 75 | ) |
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65 |
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76 | if self._narrowspecbackupname: | |
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77 | narrowspec.clearwcbackup(self._repo, self._narrowspecbackupname) | |
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66 | 78 | self._active = False |
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67 | 79 | self._closed = True |
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68 | 80 | |
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69 | 81 | def _abort(self): |
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70 |
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82 | if self._narrowspecbackupname: | |
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83 | narrowspec.restorewcbackup(self._repo, self._narrowspecbackupname) | |
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71 | 84 | self._repo.dirstate.restorebackup( |
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72 | 85 | self._repo.currenttransaction(), self._backupname |
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73 | 86 | ) |
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74 | 87 | self._active = False |
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75 | 88 | |
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76 | 89 | def release(self): |
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77 | 90 | if not self._closed: |
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78 | 91 | if not self._active: # already inactivated |
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79 | 92 | msg = ( |
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80 | 93 | _(b"can't release already inactivated backup: %s") |
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81 | 94 | % self._backupname |
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82 | 95 | ) |
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83 | 96 | raise error.Abort(msg) |
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84 | 97 | self._abort() |
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