Mercurial > hg-stable
annotate mercurial/transaction.py @ 9421:c8e4dc218aaf
log: prevent negative date range from displaying entire log (issue1805)
author | Christian Ebert <blacktrash@gmx.net> |
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date | Fri, 04 Sep 2009 11:51:28 +0200 |
parents | 8a4da1388553 |
children | ddf2adf88b89 |
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: |
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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, 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 if self.entries: self._abort() |
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63 self.file.close() |
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64 |
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65 @active |
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66 def startgroup(self): |
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67 self._queue.append([]) |
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68 |
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69 @active |
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70 def endgroup(self): |
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71 q = self._queue.pop() |
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72 d = ''.join(['%s\0%d\n' % (x[0], x[1]) for x in q]) |
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73 self.entries.extend(q) |
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74 self.file.write(d) |
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75 self.file.flush() |
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76 |
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77 @active |
2084 | 78 def add(self, file, offset, data=None): |
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79 if file in self.map: return |
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80 |
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81 if self._queue: |
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82 self._queue[-1].append((file, offset, data)) |
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83 return |
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84 |
2084 | 85 self.entries.append((file, offset, data)) |
86 self.map[file] = len(self.entries) - 1 | |
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87 # add enough data to the journal to do the truncate |
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88 self.file.write("%s\0%d\n" % (file, offset)) |
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89 self.file.flush() |
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90 |
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91 @active |
2084 | 92 def find(self, file): |
93 if file in self.map: | |
94 return self.entries[self.map[file]] | |
95 return None | |
96 | |
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97 @active |
2084 | 98 def replace(self, file, offset, data=None): |
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99 ''' |
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100 replace can only replace already committed entries |
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101 that are not pending in the queue |
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102 ''' |
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103 |
2084 | 104 if file not in self.map: |
105 raise KeyError(file) | |
106 index = self.map[file] | |
107 self.entries[index] = (file, offset, data) | |
108 self.file.write("%s\0%d\n" % (file, offset)) | |
109 self.file.flush() | |
110 | |
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111 @active |
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112 def nest(self): |
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113 self.count += 1 |
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114 return self |
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115 |
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116 def running(self): |
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117 return self.count > 0 |
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118 |
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119 @active |
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120 def close(self): |
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121 '''commit the transaction''' |
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122 self.count -= 1 |
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123 if self.count != 0: |
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124 return |
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125 self.file.close() |
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126 self.entries = [] |
95 | 127 if self.after: |
785 | 128 self.after() |
95 | 129 else: |
130 os.unlink(self.journal) | |
573 | 131 self.journal = None |
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132 |
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133 @active |
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134 def abort(self): |
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135 '''abort the transaction (generally called on error, or when the |
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136 transaction is not explicitly committed before going out of |
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137 scope)''' |
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138 self._abort() |
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139 |
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140 def _abort(self): |
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141 self.count = 0 |
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142 self.file.close() |
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143 |
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144 if not self.entries: return |
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145 |
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146 self.report(_("transaction abort!\n")) |
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147 |
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148 try: |
108 | 149 try: |
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150 _playback(self.journal, self.report, self.opener, self.entries, False) |
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151 self.report(_("rollback completed\n")) |
108 | 152 except: |
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153 self.report(_("rollback failed - please run hg recover\n")) |
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154 finally: |
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155 self.journal = None |
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156 |
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157 |
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158 def rollback(opener, file, report): |
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159 entries = [] |
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160 |
162 | 161 for l in open(file).readlines(): |
162 f, o = l.split('\0') | |
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163 entries.append((f, int(o), None)) |
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164 |
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165 _playback(file, report, opener, entries) |