Mercurial > hg
annotate mercurial/transaction.py @ 9693:c40a1ee20aa5
transaction: always remove empty journal on abort
When transactions without entries were aborted, the journal (of size 0) was not
unlinked, which prevents subsequent operations until hg recover is run on the
repository.
We also make sure the journal is unlinked when committing, even if the provided
hook doesn't do so.
author | Sune Foldager <cryo@cyanite.org> |
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date | Mon, 02 Nov 2009 10:19:14 +0100 |
parents | ddf2adf88b89 |
children | 056c366fea8c |
rev | line source |
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1 # transaction.py - simple journalling 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 # |
2859 | 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, incorporated herein by reference. |
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13 |
3891 | 14 from i18n import _ |
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15 import os, errno |
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16 import error |
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17 |
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18 def active(func): |
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19 def _active(self, *args, **kwds): |
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20 if self.count == 0: |
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21 raise error.Abort(_( |
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22 'cannot use transaction when it is already committed/aborted')) |
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23 return func(self, *args, **kwds) |
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24 return _active |
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25 |
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26 def _playback(journal, report, opener, entries, unlink=True): |
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27 for f, o, ignore in entries: |
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28 if o or not unlink: |
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29 try: |
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30 opener(f, 'a').truncate(o) |
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31 except IOError: |
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32 report(_("failed to truncate %s\n") % f) |
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33 raise |
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34 else: |
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35 try: |
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36 fn = opener(f).name |
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37 os.unlink(fn) |
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38 except (IOError, OSError), inst: |
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39 if inst.errno != errno.ENOENT: |
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40 raise |
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41 os.unlink(journal) |
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42 |
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43 class transaction(object): |
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44 def __init__(self, report, opener, journal, after=None, createmode=None): |
162 | 45 self.journal = None |
46 | |
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47 self.count = 1 |
582 | 48 self.report = report |
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49 self.opener = opener |
95 | 50 self.after = after |
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51 self.entries = [] |
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52 self.map = {} |
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53 self.journal = journal |
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54 self._queue = [] |
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55 |
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56 self.file = open(self.journal, "w") |
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57 if createmode is not None: |
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58 os.chmod(self.journal, createmode & 0666) |
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59 |
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60 def __del__(self): |
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61 if self.journal: |
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62 self._abort() |
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63 |
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64 @active |
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65 def startgroup(self): |
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66 self._queue.append([]) |
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67 |
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68 @active |
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69 def endgroup(self): |
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70 q = self._queue.pop() |
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71 d = ''.join(['%s\0%d\n' % (x[0], x[1]) for x in q]) |
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72 self.entries.extend(q) |
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73 self.file.write(d) |
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74 self.file.flush() |
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75 |
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76 @active |
2084 | 77 def add(self, file, offset, data=None): |
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78 if file in self.map: return |
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79 |
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80 if self._queue: |
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81 self._queue[-1].append((file, offset, data)) |
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82 return |
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83 |
2084 | 84 self.entries.append((file, offset, data)) |
85 self.map[file] = len(self.entries) - 1 | |
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86 # add enough data to the journal to do the truncate |
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87 self.file.write("%s\0%d\n" % (file, offset)) |
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88 self.file.flush() |
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89 |
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90 @active |
2084 | 91 def find(self, file): |
92 if file in self.map: | |
93 return self.entries[self.map[file]] | |
94 return None | |
95 | |
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96 @active |
2084 | 97 def replace(self, file, offset, data=None): |
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98 ''' |
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99 replace can only replace already committed entries |
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100 that are not pending in the queue |
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101 ''' |
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102 |
2084 | 103 if file not in self.map: |
104 raise KeyError(file) | |
105 index = self.map[file] | |
106 self.entries[index] = (file, offset, data) | |
107 self.file.write("%s\0%d\n" % (file, offset)) | |
108 self.file.flush() | |
109 | |
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110 @active |
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111 def nest(self): |
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112 self.count += 1 |
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113 return self |
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114 |
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115 def running(self): |
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116 return self.count > 0 |
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117 |
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118 @active |
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119 def close(self): |
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120 '''commit the transaction''' |
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121 self.count -= 1 |
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122 if self.count != 0: |
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123 return |
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124 self.file.close() |
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125 self.entries = [] |
95 | 126 if self.after: |
785 | 127 self.after() |
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128 if os.path.isfile(self.journal): |
95 | 129 os.unlink(self.journal) |
573 | 130 self.journal = None |
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131 |
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132 @active |
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133 def abort(self): |
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134 '''abort the transaction (generally called on error, or when the |
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135 transaction is not explicitly committed before going out of |
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136 scope)''' |
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137 self._abort() |
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138 |
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139 def _abort(self): |
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140 self.count = 0 |
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141 self.file.close() |
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142 |
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143 if not self.entries: |
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144 if self.journal: |
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145 os.unlink(self.journal) |
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146 return |
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147 |
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148 self.report(_("transaction abort!\n")) |
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149 |
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150 try: |
108 | 151 try: |
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152 _playback(self.journal, self.report, self.opener, self.entries, False) |
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153 self.report(_("rollback completed\n")) |
108 | 154 except: |
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155 self.report(_("rollback failed - please run hg recover\n")) |
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156 finally: |
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157 self.journal = None |
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158 |
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159 |
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160 def rollback(opener, file, report): |
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161 entries = [] |
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162 |
162 | 163 for l in open(file).readlines(): |
164 f, o = l.split('\0') | |
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165 entries.append((f, int(o), None)) |
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166 |
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167 _playback(file, report, opener, entries) |