Mercurial > hg
annotate mercurial/transaction.py @ 21093:71cd8b795cce
largefiles: remove dummy assignments for creating an already existing closure
author | Mads Kiilerich <madski@unity3d.com> |
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date | Sun, 13 Apr 2014 18:45:43 +0200 |
parents | 203908968644 |
children | 0d05915b688d |
rev | line source |
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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 # |
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 errno |
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16 import error, util |
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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, backupentries, 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 fp = opener(f, 'a') |
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31 fp.truncate(o) |
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32 fp.close() |
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33 except IOError: |
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34 report(_("failed to truncate %s\n") % f) |
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35 raise |
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36 else: |
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37 try: |
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38 opener.unlink(f) |
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39 except (IOError, OSError), inst: |
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40 if inst.errno != errno.ENOENT: |
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41 raise |
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42 |
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43 backupfiles = [] |
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44 for f, b, ignore in backupentries: |
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45 filepath = opener.join(f) |
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46 backuppath = opener.join(b) |
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47 try: |
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48 util.copyfile(backuppath, filepath) |
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49 backupfiles.append(b) |
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50 except IOError: |
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51 report(_("failed to recover %s\n") % f) |
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52 raise |
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53 |
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54 opener.unlink(journal) |
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55 backuppath = "%s.backupfiles" % journal |
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56 if opener.exists(backuppath): |
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57 opener.unlink(backuppath) |
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58 for f in backupfiles: |
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59 opener.unlink(f) |
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60 |
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61 class transaction(object): |
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62 def __init__(self, report, opener, journal, after=None, createmode=None, |
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63 onclose=None, onabort=None): |
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64 """Begin a new transaction |
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65 |
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66 Begins a new transaction that allows rolling back writes in the event of |
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67 an exception. |
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68 |
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69 * `after`: called after the transaction has been committed |
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70 * `createmode`: the mode of the journal file that will be created |
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71 * `onclose`: called as the transaction is closing, but before it is |
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72 closed |
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73 * `onabort`: called as the transaction is aborting, but before any files |
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74 have been truncated |
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75 """ |
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76 self.count = 1 |
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77 self.usages = 1 |
582 | 78 self.report = report |
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79 self.opener = opener |
95 | 80 self.after = after |
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81 self.onclose = onclose |
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82 self.onabort = onabort |
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83 self.entries = [] |
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84 self.backupentries = [] |
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85 self.map = {} |
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86 self.backupmap = {} |
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87 self.journal = journal |
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88 self._queue = [] |
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89 |
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90 self.backupjournal = "%s.backupfiles" % journal |
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91 self.file = opener.open(self.journal, "w") |
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92 self.backupsfile = opener.open(self.backupjournal, 'w') |
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93 if createmode is not None: |
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94 opener.chmod(self.journal, createmode & 0666) |
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95 opener.chmod(self.backupjournal, createmode & 0666) |
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96 |
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97 def __del__(self): |
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98 if self.journal: |
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99 self._abort() |
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100 |
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101 @active |
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102 def startgroup(self): |
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103 self._queue.append(([], [])) |
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104 |
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105 @active |
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106 def endgroup(self): |
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107 q = self._queue.pop() |
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108 self.entries.extend(q[0]) |
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109 self.backupentries.extend(q[1]) |
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110 |
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111 offsets = [] |
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112 backups = [] |
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113 for f, o, _ in q[0]: |
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114 offsets.append((f, o)) |
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115 |
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116 for f, b, _ in q[1]: |
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117 backups.append((f, b)) |
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118 |
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119 d = ''.join(['%s\0%d\n' % (f, o) for f, o in offsets]) |
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120 self.file.write(d) |
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121 self.file.flush() |
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122 |
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123 d = ''.join(['%s\0%s\0' % (f, b) for f, b in backups]) |
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124 self.backupsfile.write(d) |
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125 self.backupsfile.flush() |
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126 |
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127 @active |
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129 if file in self.map or file in self.backupmap: |
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130 return |
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131 if self._queue: |
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132 self._queue[-1][0].append((file, offset, data)) |
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133 return |
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134 |
2084 | 135 self.entries.append((file, offset, data)) |
136 self.map[file] = len(self.entries) - 1 | |
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137 # add enough data to the journal to do the truncate |
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138 self.file.write("%s\0%d\n" % (file, offset)) |
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139 self.file.flush() |
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140 |
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141 @active |
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142 def addbackup(self, file, hardlink=True): |
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143 """Adds a backup of the file to the transaction |
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144 |
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145 Calling addbackup() creates a hardlink backup of the specified file |
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146 that is used to recover the file in the event of the transaction |
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147 aborting. |
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148 |
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149 * `file`: the file path, relative to .hg/store |
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150 * `hardlink`: use a hardlink to quickly create the backup |
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151 """ |
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152 |
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153 if file in self.map or file in self.backupmap: |
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154 return |
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155 backupfile = "journal.%s" % file |
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156 if self.opener.exists(file): |
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157 filepath = self.opener.join(file) |
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158 backuppath = self.opener.join(backupfile) |
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159 util.copyfiles(filepath, backuppath, hardlink=hardlink) |
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160 else: |
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161 self.add(file, 0) |
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162 return |
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163 |
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164 if self._queue: |
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165 self._queue[-1][1].append((file, backupfile)) |
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166 return |
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167 |
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168 self.backupentries.append((file, backupfile, None)) |
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169 self.backupmap[file] = len(self.backupentries) - 1 |
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170 self.backupsfile.write("%s\0%s\0" % (file, backupfile)) |
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171 self.backupsfile.flush() |
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172 |
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173 @active |
2084 | 174 def find(self, file): |
175 if file in self.map: | |
176 return self.entries[self.map[file]] | |
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177 if file in self.backupmap: |
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178 return self.backupentries[self.backupmap[file]] |
2084 | 179 return None |
180 | |
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181 @active |
2084 | 182 def replace(self, file, offset, data=None): |
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183 ''' |
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184 replace can only replace already committed entries |
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185 that are not pending in the queue |
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186 ''' |
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187 |
2084 | 188 if file not in self.map: |
189 raise KeyError(file) | |
190 index = self.map[file] | |
191 self.entries[index] = (file, offset, data) | |
192 self.file.write("%s\0%d\n" % (file, offset)) | |
193 self.file.flush() | |
194 | |
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195 @active |
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196 def nest(self): |
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197 self.count += 1 |
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198 self.usages += 1 |
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199 return self |
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200 |
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201 def release(self): |
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202 if self.count > 0: |
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203 self.usages -= 1 |
11685 | 204 # if the transaction scopes are left without being closed, fail |
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205 if self.count > 0 and self.usages == 0: |
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206 self._abort() |
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207 |
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208 def running(self): |
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209 return self.count > 0 |
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210 |
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211 @active |
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212 def close(self): |
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213 '''commit the transaction''' |
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214 if self.count == 1 and self.onclose is not None: |
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215 self.onclose() |
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216 |
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217 self.count -= 1 |
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218 if self.count != 0: |
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219 return |
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220 self.file.close() |
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221 self.entries = [] |
95 | 222 if self.after: |
785 | 223 self.after() |
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224 if self.opener.isfile(self.journal): |
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225 self.opener.unlink(self.journal) |
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226 if self.opener.isfile(self.backupjournal): |
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227 self.opener.unlink(self.backupjournal) |
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228 for f, b, _ in self.backupentries: |
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229 self.opener.unlink(b) |
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230 self.backupentries = [] |
573 | 231 self.journal = None |
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232 |
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233 @active |
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234 def abort(self): |
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235 '''abort the transaction (generally called on error, or when the |
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236 transaction is not explicitly committed before going out of |
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237 scope)''' |
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238 self._abort() |
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239 |
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240 def _abort(self): |
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241 self.count = 0 |
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242 self.usages = 0 |
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243 self.file.close() |
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244 |
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245 if self.onabort is not None: |
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246 self.onabort() |
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247 |
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248 try: |
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249 if not self.entries and not self.backupentries: |
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250 if self.journal: |
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251 self.opener.unlink(self.journal) |
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252 if self.backupjournal: |
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253 self.opener.unlink(self.backupjournal) |
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254 return |
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255 |
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256 self.report(_("transaction abort!\n")) |
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257 |
108 | 258 try: |
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259 _playback(self.journal, self.report, self.opener, |
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260 self.entries, self.backupentries, False) |
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261 self.report(_("rollback completed\n")) |
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262 except Exception: |
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263 self.report(_("rollback failed - please run hg recover\n")) |
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264 finally: |
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265 self.journal = None |
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266 |
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267 |
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268 def rollback(opener, file, report): |
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269 """Rolls back the transaction contained in the given file |
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270 |
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271 Reads the entries in the specified file, and the corresponding |
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272 '*.backupfiles' file, to recover from an incomplete transaction. |
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273 |
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274 * `file`: a file containing a list of entries, specifying where |
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275 to truncate each file. The file should contain a list of |
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276 file\0offset pairs, delimited by newlines. The corresponding |
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277 '*.backupfiles' file should contain a list of file\0backupfile |
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278 pairs, delimited by \0. |
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279 """ |
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280 entries = [] |
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281 backupentries = [] |
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282 |
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283 fp = opener.open(file) |
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284 lines = fp.readlines() |
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285 fp.close() |
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286 for l in lines: |
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287 try: |
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288 f, o = l.split('\0') |
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289 entries.append((f, int(o), None)) |
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290 except ValueError: |
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291 report(_("couldn't read journal entry %r!\n") % l) |
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292 |
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293 backupjournal = "%s.backupfiles" % file |
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294 if opener.exists(backupjournal): |
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295 fp = opener.open(backupjournal) |
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296 data = fp.read() |
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297 if len(data) > 0: |
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298 parts = data.split('\0') |
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299 for i in xrange(0, len(parts), 2): |
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300 f, b = parts[i:i + 1] |
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301 backupentries.append((f, b, None)) |
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302 |
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303 _playback(file, report, opener, entries, backupentries) |