Mercurial > hg
annotate mercurial/transaction.py @ 10592:1875dc1ac5f4 stable
Added tag 1.5 for changeset ff2704a8ded3
author | Matt Mackall <mpm@selenic.com> |
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date | Fri, 05 Mar 2010 18:26:12 -0600 |
parents | 08a0f04b56bd |
children | 5116a077c3da |
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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 |
10263 | 12 # GNU General Public License version 2 or any later version. |
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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): |
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45 self.count = 1 |
582 | 46 self.report = report |
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47 self.opener = opener |
95 | 48 self.after = after |
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49 self.entries = [] |
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50 self.map = {} |
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51 self.journal = journal |
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52 self._queue = [] |
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53 |
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54 self.file = open(self.journal, "w") |
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55 if createmode is not None: |
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56 os.chmod(self.journal, createmode & 0666) |
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57 |
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58 def __del__(self): |
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59 if self.journal: |
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60 self._abort() |
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61 |
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62 @active |
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63 def startgroup(self): |
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64 self._queue.append([]) |
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65 |
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66 @active |
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67 def endgroup(self): |
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68 q = self._queue.pop() |
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69 d = ''.join(['%s\0%d\n' % (x[0], x[1]) for x in q]) |
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70 self.entries.extend(q) |
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71 self.file.write(d) |
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72 self.file.flush() |
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73 |
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74 @active |
2084 | 75 def add(self, file, offset, data=None): |
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76 if file in self.map: |
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77 return |
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78 if self._queue: |
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79 self._queue[-1].append((file, offset, data)) |
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80 return |
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81 |
2084 | 82 self.entries.append((file, offset, data)) |
83 self.map[file] = len(self.entries) - 1 | |
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84 # add enough data to the journal to do the truncate |
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85 self.file.write("%s\0%d\n" % (file, offset)) |
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86 self.file.flush() |
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87 |
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88 @active |
2084 | 89 def find(self, file): |
90 if file in self.map: | |
91 return self.entries[self.map[file]] | |
92 return None | |
93 | |
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94 @active |
2084 | 95 def replace(self, file, offset, data=None): |
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96 ''' |
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97 replace can only replace already committed entries |
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98 that are not pending in the queue |
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99 ''' |
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100 |
2084 | 101 if file not in self.map: |
102 raise KeyError(file) | |
103 index = self.map[file] | |
104 self.entries[index] = (file, offset, data) | |
105 self.file.write("%s\0%d\n" % (file, offset)) | |
106 self.file.flush() | |
107 | |
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108 @active |
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109 def nest(self): |
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110 self.count += 1 |
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111 return self |
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112 |
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113 def running(self): |
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114 return self.count > 0 |
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115 |
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116 @active |
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117 def close(self): |
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118 '''commit the transaction''' |
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119 self.count -= 1 |
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120 if self.count != 0: |
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121 return |
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122 self.file.close() |
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123 self.entries = [] |
95 | 124 if self.after: |
785 | 125 self.after() |
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126 if os.path.isfile(self.journal): |
95 | 127 os.unlink(self.journal) |
573 | 128 self.journal = None |
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129 |
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130 @active |
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131 def abort(self): |
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132 '''abort the transaction (generally called on error, or when the |
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133 transaction is not explicitly committed before going out of |
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134 scope)''' |
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135 self._abort() |
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136 |
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137 def _abort(self): |
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138 self.count = 0 |
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139 self.file.close() |
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140 |
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141 try: |
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142 if not self.entries: |
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143 if self.journal: |
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144 os.unlink(self.journal) |
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145 return |
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146 |
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147 self.report(_("transaction abort!\n")) |
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148 |
108 | 149 try: |
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150 _playback(self.journal, self.report, self.opener, |
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151 self.entries, False) |
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152 self.report(_("rollback completed\n")) |
108 | 153 except: |
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154 self.report(_("rollback failed - please run hg recover\n")) |
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155 finally: |
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156 self.journal = None |
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157 |
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158 |
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159 def rollback(opener, file, report): |
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160 entries = [] |
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161 |
162 | 162 for l in open(file).readlines(): |
163 f, o = l.split('\0') | |
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164 entries.append((f, int(o), None)) |
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165 |
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166 _playback(file, report, opener, entries) |