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annotate mercurial/transaction.py @ 23250:8919dc7f2dbb

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transaction: document startgroup and endgroup These enigmatic methods are only used in repair. We document them to clarify there purpose and user.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Wed, 05 Nov 2014 10:00:15 +0000
parents 84720eab4fbd
children 85c634ff395a
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1 # transaction.py - simple journaling scheme for mercurial
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2 #
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3 # This transaction scheme is intended to gracefully handle program
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4 # errors and interruptions. More serious failures like system crashes
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5 # can be recovered with an fsck-like tool. As the whole repository is
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6 # effectively log-structured, this should amount to simply truncating
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7 # anything that isn't referenced in the changelog.
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8 #
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9 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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10 #
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11 # This software may be used and distributed according to the terms of the
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12 # GNU General Public License version 2 or any later version.
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13
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14 from i18n import _
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15 import errno
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16 import error, util
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17
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18 version = 1
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19
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20 def active(func):
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21 def _active(self, *args, **kwds):
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22 if self.count == 0:
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23 raise error.Abort(_(
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24 'cannot use transaction when it is already committed/aborted'))
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25 return func(self, *args, **kwds)
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26 return _active
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27
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28 def _playback(journal, report, opener, entries, backupentries, unlink=True):
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29 for f, o, _ignore in entries:
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30 if o or not unlink:
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31 try:
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32 fp = opener(f, 'a')
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33 fp.truncate(o)
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34 fp.close()
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35 except IOError:
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36 report(_("failed to truncate %s\n") % f)
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37 raise
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38 else:
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39 try:
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40 opener.unlink(f)
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41 except (IOError, OSError), inst:
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42 if inst.errno != errno.ENOENT:
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43 raise
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44
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45 backupfiles = []
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46 for f, b in backupentries:
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47 filepath = opener.join(f)
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48 backuppath = opener.join(b)
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49 try:
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50 util.copyfile(backuppath, filepath)
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51 backupfiles.append(b)
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52 except IOError:
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53 report(_("failed to recover %s\n") % f)
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54 raise
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55
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56 opener.unlink(journal)
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57 backuppath = "%s.backupfiles" % journal
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58 if opener.exists(backuppath):
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59 opener.unlink(backuppath)
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60 for f in backupfiles:
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61 opener.unlink(f)
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62
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63 class transaction(object):
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64 def __init__(self, report, opener, journal, after=None, createmode=None,
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65 onclose=None, onabort=None):
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66 """Begin a new transaction
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67
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68 Begins a new transaction that allows rolling back writes in the event of
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69 an exception.
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70
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71 * `after`: called after the transaction has been committed
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72 * `createmode`: the mode of the journal file that will be created
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73 * `onclose`: called as the transaction is closing, but before it is
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74 closed
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75 * `onabort`: called as the transaction is aborting, but before any files
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76 have been truncated
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77 """
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78 self.count = 1
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79 self.usages = 1
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80 self.report = report
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81 self.opener = opener
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82 self.after = after
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83 self.onclose = onclose
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84 self.onabort = onabort
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85 self.entries = []
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86 self.map = {}
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87 # a list of ('path', 'backuppath') entries.
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88 self._backupentries = []
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89 self._backupmap = {}
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90 self.journal = journal
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91 self._queue = []
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92 # a dict of arguments to be passed to hooks
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93 self.hookargs = {}
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94
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95 self._backupjournal = "%s.backupfiles" % journal
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96 self.file = opener.open(self.journal, "w")
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97 self._backupsfile = opener.open(self._backupjournal, 'w')
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98 self._backupsfile.write('%d\n' % version)
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99 if createmode is not None:
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100 opener.chmod(self.journal, createmode & 0666)
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101 opener.chmod(self._backupjournal, createmode & 0666)
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102
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103 # hold file generations to be performed on commit
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104 self._filegenerators = {}
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105 # hold callbalk to write pending data for hooks
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106 self._pendingcallback = {}
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107 # True is any pending data have been written ever
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108 self._anypending = False
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109 # holds callback to call when writing the transaction
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110 self._finalizecallback = {}
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111 # hold callbalk for post transaction close
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112 self._postclosecallback = {}
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113
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114 def __del__(self):
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115 if self.journal:
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116 self._abort()
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117
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118 @active
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119 def startgroup(self):
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120 """delay registration of file entry
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121
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122 This is used by strip to delay vision of strip offset. The transaction
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123 sees either none or all of the strip actions to be done."""
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124 self._queue.append(([], []))
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125
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126 @active
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127 def endgroup(self):
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128 """apply delayed registration of file entry.
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129
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130 This is used by strip to delay vision of strip offset. The transaction
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131 sees either none or all of the strip actions to be done."""
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132 q = self._queue.pop()
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133 self.entries.extend(q[0])
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134 self._backupentries.extend(q[1])
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135
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parents: 20881
diff changeset
136 offsets = []
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diff changeset
137 backups = []
22199
b3e51675f98e cleanup: avoid _ for local unused tmp variables - that is reserved for i18n
Mads Kiilerich <madski@unity3d.com>
parents: 22078
diff changeset
138 for f, o, _data in q[0]:
20882
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parents: 20881
diff changeset
139 offsets.append((f, o))
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parents: 20881
diff changeset
140
23247
def27d46a9a8 transaction: drop the third item in `tr.backupentries`
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23220
diff changeset
141 for f, b in q[1]:
20882
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parents: 20881
diff changeset
142 backups.append((f, b))
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parents: 20881
diff changeset
143
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parents: 20881
diff changeset
144 d = ''.join(['%s\0%d\n' % (f, o) for f, o in offsets])
8363
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diff changeset
145 self.file.write(d)
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parents: 8294
diff changeset
146 self.file.flush()
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parents: 8294
diff changeset
147
23065
963f311e3a81 transactions: change backupfiles format to use newlines
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parents: 23064
diff changeset
148 d = ''.join(['%s\0%s\n' % (f, b) for f, b in backups])
23249
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23248
diff changeset
149 self._backupsfile.write(d)
84720eab4fbd transaction: mark backup-related attributes private
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diff changeset
150 self._backupsfile.flush()
20882
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diff changeset
151
8363
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parents: 8294
diff changeset
152 @active
2084
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
153 def add(self, file, offset, data=None):
23249
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23248
diff changeset
154 if file in self.map or file in self._backupmap:
10282
08a0f04b56bd many, many trivial check-code fixups
Matt Mackall <mpm@selenic.com>
parents: 10263
diff changeset
155 return
8363
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parents: 8294
diff changeset
156 if self._queue:
20882
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parents: 20881
diff changeset
157 self._queue[-1][0].append((file, offset, data))
8363
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parents: 8294
diff changeset
158 return
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parents: 8294
diff changeset
159
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parents: 1806
diff changeset
160 self.entries.append((file, offset, data))
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
161 self.map[file] = len(self.entries) - 1
0
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mpm@selenic.com
parents:
diff changeset
162 # add enough data to the journal to do the truncate
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mpm@selenic.com
parents:
diff changeset
163 self.file.write("%s\0%d\n" % (file, offset))
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
164 self.file.flush()
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mpm@selenic.com
parents:
diff changeset
165
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Henrik Stuart <hg@hstuart.dk>
parents: 8225
diff changeset
166 @active
22663
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22662
diff changeset
167 def addbackup(self, file, hardlink=True, vfs=None):
20882
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parents: 20881
diff changeset
168 """Adds a backup of the file to the transaction
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parents: 20881
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169
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parents: 20881
diff changeset
170 Calling addbackup() creates a hardlink backup of the specified file
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parents: 20881
diff changeset
171 that is used to recover the file in the event of the transaction
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parents: 20881
diff changeset
172 aborting.
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parents: 20881
diff changeset
173
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parents: 20881
diff changeset
174 * `file`: the file path, relative to .hg/store
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parents: 20881
diff changeset
175 * `hardlink`: use a hardlink to quickly create the backup
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parents: 20881
diff changeset
176 """
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parents: 20881
diff changeset
177
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parents: 23248
diff changeset
178 if file in self.map or file in self._backupmap:
20882
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parents: 20881
diff changeset
179 return
22077
2990ce46fc2d transaction: backup file in a dedicated "namespace"
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22076
diff changeset
180 backupfile = "%s.backup.%s" % (self.journal, file)
22663
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parents: 22662
diff changeset
181 if vfs is None:
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22662
diff changeset
182 vfs = self.opener
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parents: 22662
diff changeset
183 if vfs.exists(file):
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parents: 22662
diff changeset
184 filepath = vfs.join(file)
20882
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parents: 20881
diff changeset
185 backuppath = self.opener.join(backupfile)
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parents: 20881
diff changeset
186 util.copyfiles(filepath, backuppath, hardlink=hardlink)
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parents: 20881
diff changeset
187 else:
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parents: 20881
diff changeset
188 self.add(file, 0)
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parents: 20881
diff changeset
189 return
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parents: 20881
diff changeset
190
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parents: 20881
diff changeset
191 if self._queue:
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parents: 20881
diff changeset
192 self._queue[-1][1].append((file, backupfile))
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parents: 20881
diff changeset
193 return
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parents: 20881
diff changeset
194
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23248
diff changeset
195 self._backupentries.append((file, backupfile))
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parents: 23248
diff changeset
196 self._backupmap[file] = len(self._backupentries) - 1
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parents: 23248
diff changeset
197 self._backupsfile.write("%s\0%s\n" % (file, backupfile))
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parents: 23248
diff changeset
198 self._backupsfile.flush()
20882
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parents: 20881
diff changeset
199
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Durham Goode <durham@fb.com>
parents: 20881
diff changeset
200 @active
22663
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22662
diff changeset
201 def addfilegenerator(self, genid, filenames, genfunc, order=0, vfs=None):
22078
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
202 """add a function to generates some files at transaction commit
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
203
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
204 The `genfunc` argument is a function capable of generating proper
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
205 content of each entry in the `filename` tuple.
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
206
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
207 At transaction close time, `genfunc` will be called with one file
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
208 object argument per entries in `filenames`.
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
209
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
210 The transaction itself is responsible for the backup, creation and
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
211 final write of such file.
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
212
feb4797c676e transaction: add a file generation mechanism
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parents: 22077
diff changeset
213 The `genid` argument is used to ensure the same set of file is only
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
214 generated once. Call to `addfilegenerator` for a `genid` already
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
215 present will overwrite the old entry.
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
216
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
217 The `order` argument may be used to control the order in which multiple
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
218 generator will be executed.
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
219 """
22663
4c6198737ad8 transaction: allow generating file outside of store
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22662
diff changeset
220 # For now, we are unable to do proper backup and restore of custom vfs
4c6198737ad8 transaction: allow generating file outside of store
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22662
diff changeset
221 # but for bookmarks that are handled outside this mechanism.
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22662
diff changeset
222 assert vfs is None or filenames == ('bookmarks',)
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22662
diff changeset
223 self._filegenerators[genid] = (order, filenames, genfunc, vfs)
22078
feb4797c676e transaction: add a file generation mechanism
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 22077
diff changeset
224
23102
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
225 def _generatefiles(self):
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
226 # write files registered for generation
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
227 for entry in sorted(self._filegenerators.values()):
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
228 order, filenames, genfunc, vfs = entry
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
229 if vfs is None:
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
230 vfs = self.opener
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
231 files = []
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
232 try:
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
233 for name in filenames:
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
234 # Some files are already backed up when creating the
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
235 # localrepo. Until this is properly fixed we disable the
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
236 # backup for them.
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
237 if name not in ('phaseroots', 'bookmarks'):
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
238 self.addbackup(name)
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
239 files.append(vfs(name, 'w', atomictemp=True))
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
240 genfunc(*files)
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
241 finally:
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
242 for f in files:
16da812ad970 transaction: extract file generation into its own function
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23065
diff changeset
243 f.close()
16da812ad970 transaction: extract file generation into its own function
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parents: 23065
diff changeset
244
22078
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parents: 22077
diff changeset
245 @active
2084
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
246 def find(self, file):
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
247 if file in self.map:
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
248 return self.entries[self.map[file]]
23249
84720eab4fbd transaction: mark backup-related attributes private
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23248
diff changeset
249 if file in self._backupmap:
84720eab4fbd transaction: mark backup-related attributes private
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23248
diff changeset
250 return self._backupentries[self._backupmap[file]]
2084
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
251 return None
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
252
8289
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Henrik Stuart <hg@hstuart.dk>
parents: 8225
diff changeset
253 @active
2084
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
254 def replace(self, file, offset, data=None):
8363
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Henrik Stuart <hg@hstuart.dk>
parents: 8294
diff changeset
255 '''
c8e81f557da7 transaction: add atomic groups to transaction logic
Henrik Stuart <hg@hstuart.dk>
parents: 8294
diff changeset
256 replace can only replace already committed entries
c8e81f557da7 transaction: add atomic groups to transaction logic
Henrik Stuart <hg@hstuart.dk>
parents: 8294
diff changeset
257 that are not pending in the queue
c8e81f557da7 transaction: add atomic groups to transaction logic
Henrik Stuart <hg@hstuart.dk>
parents: 8294
diff changeset
258 '''
c8e81f557da7 transaction: add atomic groups to transaction logic
Henrik Stuart <hg@hstuart.dk>
parents: 8294
diff changeset
259
2084
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
260 if file not in self.map:
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
261 raise KeyError(file)
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
262 index = self.map[file]
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
263 self.entries[index] = (file, offset, data)
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
264 self.file.write("%s\0%d\n" % (file, offset))
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
265 self.file.flush()
Chris Mason <mason@suse.com>
parents: 1806
diff changeset
266
8289
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Henrik Stuart <hg@hstuart.dk>
parents: 8225
diff changeset
267 @active
1806
a2c69737e65e Automatic nesting into running transactions in the same repository.
mason@suse.com
parents: 1559
diff changeset
268 def nest(self):
a2c69737e65e Automatic nesting into running transactions in the same repository.
mason@suse.com
parents: 1559
diff changeset
269 self.count += 1
11230
5116a077c3da make transactions work on non-refcounted python implementations
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 10282
diff changeset
270 self.usages += 1
1806
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mason@suse.com
parents: 1559
diff changeset
271 return self
a2c69737e65e Automatic nesting into running transactions in the same repository.
mason@suse.com
parents: 1559
diff changeset
272
11230
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Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 10282
diff changeset
273 def release(self):
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Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 10282
diff changeset
274 if self.count > 0:
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Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 10282
diff changeset
275 self.usages -= 1
11685
aade8f133d11 cleanup: typos
Patrick Mezard <pmezard@gmail.com>
parents: 11230
diff changeset
276 # if the transaction scopes are left without being closed, fail
11230
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parents: 10282
diff changeset
277 if self.count > 0 and self.usages == 0:
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Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 10282
diff changeset
278 self._abort()
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parents: 10282
diff changeset
279
1806
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280 def running(self):
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281 return self.count > 0
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282
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283 def addpending(self, category, callback):
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284 """add a callback to be called when the transaction is pending
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285
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286 Category is a unique identifier to allow overwriting an old callback
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287 with a newer callback.
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288 """
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289 self._pendingcallback[category] = callback
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290
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291 @active
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292 def writepending(self):
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293 '''write pending file to temporary version
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294
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295 This is used to allow hooks to view a transaction before commit'''
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296 categories = sorted(self._pendingcallback)
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297 for cat in categories:
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298 # remove callback since the data will have been flushed
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299 any = self._pendingcallback.pop(cat)()
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300 self._anypending = self._anypending or any
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301 return self._anypending
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302
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303 @active
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304 def addfinalize(self, category, callback):
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305 """add a callback to be called when the transaction is closed
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parents: 23202
diff changeset
306
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diff changeset
307 Category is a unique identifier to allow overwriting old callbacks with
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308 newer callbacks.
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Pierre-Yves David <pierre-yves.david@fb.com>
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309 """
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310 self._finalizecallback[category] = callback
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311
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312 @active
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313 def addpostclose(self, category, callback):
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314 """add a callback to be called after the transaction is closed
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23204
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315
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316 Category is a unique identifier to allow overwriting an old callback
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parents: 23204
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317 with a newer callback.
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Pierre-Yves David <pierre-yves.david@fb.com>
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318 """
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Pierre-Yves David <pierre-yves.david@fb.com>
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319 self._postclosecallback[category] = callback
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23204
diff changeset
320
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parents: 23204
diff changeset
321 @active
0
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322 def close(self):
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parents: 9094
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323 '''commit the transaction'''
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parents: 20524
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324 if self.count == 1 and self.onclose is not None:
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23102
diff changeset
325 self._generatefiles()
23204
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parents: 23202
diff changeset
326 categories = sorted(self._finalizecallback)
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parents: 23202
diff changeset
327 for cat in categories:
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parents: 23202
diff changeset
328 self._finalizecallback[cat]()
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329 self.onclose()
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parents: 20524
diff changeset
330
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331 self.count -= 1
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diff changeset
332 if self.count != 0:
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333 return
0
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334 self.file.close()
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335 self._backupsfile.close()
0
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336 self.entries = []
95
589f507bb259 Beginnings of transaction undo support
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parents: 43
diff changeset
337 if self.after:
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parents: 582
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338 self.after()
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parents: 20084
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339 if self.opener.isfile(self.journal):
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340 self.opener.unlink(self.journal)
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341 if self.opener.isfile(self._backupjournal):
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342 self.opener.unlink(self._backupjournal)
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343 for _f, b in self._backupentries:
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344 self.opener.unlink(b)
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diff changeset
345 self._backupentries = []
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parents: 558
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346 self.journal = None
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diff changeset
347 # run post close action
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348 categories = sorted(self._postclosecallback)
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Pierre-Yves David <pierre-yves.david@fb.com>
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diff changeset
349 for cat in categories:
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diff changeset
350 self._postclosecallback[cat]()
0
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351
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352 @active
0
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353 def abort(self):
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354 '''abort the transaction (generally called on error, or when the
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Greg Ward <greg-hg@gerg.ca>
parents: 9094
diff changeset
355 transaction is not explicitly committed before going out of
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parents: 9094
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356 scope)'''
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357 self._abort()
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diff changeset
358
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parents: 8225
diff changeset
359 def _abort(self):
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parents: 8289
diff changeset
360 self.count = 0
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parents: 10282
diff changeset
361 self.usages = 0
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parents: 8289
diff changeset
362 self.file.close()
23249
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parents: 23248
diff changeset
363 self._backupsfile.close()
8290
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parents: 8289
diff changeset
364
20881
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Durham Goode <durham@fb.com>
parents: 20524
diff changeset
365 if self.onabort is not None:
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Durham Goode <durham@fb.com>
parents: 20524
diff changeset
366 self.onabort()
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Durham Goode <durham@fb.com>
parents: 20524
diff changeset
367
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 9693
diff changeset
368 try:
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23248
diff changeset
369 if not self.entries and not self._backupentries:
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 9693
diff changeset
370 if self.journal:
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parents: 20084
diff changeset
371 self.opener.unlink(self.journal)
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23248
diff changeset
372 if self._backupjournal:
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parents: 23248
diff changeset
373 self.opener.unlink(self._backupjournal)
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 9693
diff changeset
374 return
0
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diff changeset
375
10228
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 9693
diff changeset
376 self.report(_("transaction abort!\n"))
0
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parents:
diff changeset
377
108
8d55c2d72c7c Warn if we fail to truncate something
mpm@selenic.com
parents: 95
diff changeset
378 try:
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parents: 10263
diff changeset
379 _playback(self.journal, self.report, self.opener,
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parents: 23248
diff changeset
380 self.entries, self._backupentries, False)
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parents: 8290
diff changeset
381 self.report(_("rollback completed\n"))
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Brodie Rao <brodie@sf.io>
parents: 13408
diff changeset
382 except Exception:
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parents: 8290
diff changeset
383 self.report(_("rollback failed - please run hg recover\n"))
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parents: 8290
diff changeset
384 finally:
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parents: 8290
diff changeset
385 self.journal = None
8290
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parents: 8289
diff changeset
386
560af1bbfd6e transaction: reset transaction on abort
Henrik Stuart <hg@hstuart.dk>
parents: 8289
diff changeset
387
8294
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Henrik Stuart <hg@hstuart.dk>
parents: 8290
diff changeset
388 def rollback(opener, file, report):
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parents: 20881
diff changeset
389 """Rolls back the transaction contained in the given file
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parents: 20881
diff changeset
390
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parents: 20881
diff changeset
391 Reads the entries in the specified file, and the corresponding
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Durham Goode <durham@fb.com>
parents: 20881
diff changeset
392 '*.backupfiles' file, to recover from an incomplete transaction.
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Durham Goode <durham@fb.com>
parents: 20881
diff changeset
393
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Durham Goode <durham@fb.com>
parents: 20881
diff changeset
394 * `file`: a file containing a list of entries, specifying where
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parents: 20881
diff changeset
395 to truncate each file. The file should contain a list of
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Durham Goode <durham@fb.com>
parents: 20881
diff changeset
396 file\0offset pairs, delimited by newlines. The corresponding
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parents: 20881
diff changeset
397 '*.backupfiles' file should contain a list of file\0backupfile
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parents: 20881
diff changeset
398 pairs, delimited by \0.
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parents: 20881
diff changeset
399 """
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diff changeset
400 entries = []
20882
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diff changeset
401 backupentries = []
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parents: 8290
diff changeset
402
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 20084
diff changeset
403 fp = opener.open(file)
13400
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Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents: 11685
diff changeset
404 lines = fp.readlines()
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Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents: 11685
diff changeset
405 fp.close()
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Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents: 11685
diff changeset
406 for l in lines:
20524
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Matt Mackall <mpm@selenic.com>
parents: 20087
diff changeset
407 try:
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Matt Mackall <mpm@selenic.com>
parents: 20087
diff changeset
408 f, o = l.split('\0')
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parents: 20087
diff changeset
409 entries.append((f, int(o), None))
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Matt Mackall <mpm@selenic.com>
parents: 20087
diff changeset
410 except ValueError:
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parents: 20087
diff changeset
411 report(_("couldn't read journal entry %r!\n") % l)
0
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parents:
diff changeset
412
20882
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parents: 20881
diff changeset
413 backupjournal = "%s.backupfiles" % file
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parents: 20881
diff changeset
414 if opener.exists(backupjournal):
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parents: 20881
diff changeset
415 fp = opener.open(backupjournal)
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parents: 23064
diff changeset
416 lines = fp.readlines()
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parents: 23064
diff changeset
417 if lines:
963f311e3a81 transactions: change backupfiles format to use newlines
Durham Goode <durham@fb.com>
parents: 23064
diff changeset
418 ver = lines[0][:-1]
23064
5dc888b79e70 transactions: add version number to journal.backupfiles
Durham Goode <durham@fb.com>
parents: 23063
diff changeset
419 if ver == str(version):
23065
963f311e3a81 transactions: change backupfiles format to use newlines
Durham Goode <durham@fb.com>
parents: 23064
diff changeset
420 for line in lines[1:]:
963f311e3a81 transactions: change backupfiles format to use newlines
Durham Goode <durham@fb.com>
parents: 23064
diff changeset
421 if line:
963f311e3a81 transactions: change backupfiles format to use newlines
Durham Goode <durham@fb.com>
parents: 23064
diff changeset
422 # Shave off the trailing newline
963f311e3a81 transactions: change backupfiles format to use newlines
Durham Goode <durham@fb.com>
parents: 23064
diff changeset
423 line = line[:-1]
963f311e3a81 transactions: change backupfiles format to use newlines
Durham Goode <durham@fb.com>
parents: 23064
diff changeset
424 f, b = line.split('\0')
23247
def27d46a9a8 transaction: drop the third item in `tr.backupentries`
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 23220
diff changeset
425 backupentries.append((f, b))
23064
5dc888b79e70 transactions: add version number to journal.backupfiles
Durham Goode <durham@fb.com>
parents: 23063
diff changeset
426 else:
5dc888b79e70 transactions: add version number to journal.backupfiles
Durham Goode <durham@fb.com>
parents: 23063
diff changeset
427 report(_("journal was created by a newer version of "
5dc888b79e70 transactions: add version number to journal.backupfiles
Durham Goode <durham@fb.com>
parents: 23063
diff changeset
428 "Mercurial"))
20882
5dffd06f1e50 transaction: add support for non-append files
Durham Goode <durham@fb.com>
parents: 20881
diff changeset
429
5dffd06f1e50 transaction: add support for non-append files
Durham Goode <durham@fb.com>
parents: 20881
diff changeset
430 _playback(file, report, opener, entries, backupentries)