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@@ -1,501 +1,501 b'' | |||
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1 | 1 | # transaction.py - simple journaling scheme for mercurial |
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2 | 2 | # |
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3 | 3 | # This transaction scheme is intended to gracefully handle program |
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4 | 4 | # errors and interruptions. More serious failures like system crashes |
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5 | 5 | # can be recovered with an fsck-like tool. As the whole repository is |
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6 | 6 | # effectively log-structured, this should amount to simply truncating |
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7 | 7 | # anything that isn't referenced in the changelog. |
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8 | 8 | # |
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9 | 9 | # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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10 | 10 | # |
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11 | 11 | # This software may be used and distributed according to the terms of the |
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12 | 12 | # GNU General Public License version 2 or any later version. |
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13 | 13 | |
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14 | 14 | from i18n import _ |
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15 | 15 | import os |
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16 | 16 | import errno |
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17 | 17 | import error, util |
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18 | 18 | |
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19 | 19 | version = 2 |
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20 | 20 | |
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21 | 21 | def active(func): |
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22 | 22 | def _active(self, *args, **kwds): |
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23 | 23 | if self.count == 0: |
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24 | 24 | raise error.Abort(_( |
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25 | 25 | 'cannot use transaction when it is already committed/aborted')) |
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26 | 26 | return func(self, *args, **kwds) |
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27 | 27 | return _active |
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28 | 28 | |
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29 | 29 | def _playback(journal, report, opener, vfsmap, entries, backupentries, |
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30 | 30 | unlink=True): |
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31 | 31 | for f, o, _ignore in entries: |
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32 | 32 | if o or not unlink: |
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33 | 33 | try: |
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34 | 34 | fp = opener(f, 'a') |
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35 | 35 | fp.truncate(o) |
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36 | 36 | fp.close() |
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37 | 37 | except IOError: |
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38 | 38 | report(_("failed to truncate %s\n") % f) |
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39 | 39 | raise |
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40 | 40 | else: |
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41 | 41 | try: |
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42 | 42 | opener.unlink(f) |
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43 | 43 | except (IOError, OSError), inst: |
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44 | 44 | if inst.errno != errno.ENOENT: |
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45 | 45 | raise |
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46 | 46 | |
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47 | 47 | backupfiles = [] |
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48 | 48 | for l, f, b, c in backupentries: |
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49 | 49 | if l not in vfsmap and c: |
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50 | 50 | report("couldn't handle %s: unknown cache location %s\n" |
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51 | 51 | % (b, l)) |
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52 | 52 | vfs = vfsmap[l] |
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53 | 53 | try: |
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54 | 54 | if f and b: |
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55 | 55 | filepath = vfs.join(f) |
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56 | 56 | backuppath = vfs.join(b) |
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57 | 57 | try: |
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58 | 58 | util.copyfile(backuppath, filepath) |
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59 | 59 | backupfiles.append(b) |
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60 | 60 | except IOError: |
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61 | 61 | report(_("failed to recover %s\n") % f) |
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62 | 62 | else: |
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63 | 63 | target = f or b |
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64 | 64 | try: |
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65 | 65 | vfs.unlink(target) |
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66 | 66 | except (IOError, OSError), inst: |
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67 | 67 | if inst.errno != errno.ENOENT: |
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68 | 68 | raise |
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69 | 69 | except (IOError, OSError, util.Abort), inst: |
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70 | 70 | if not c: |
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71 | 71 | raise |
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72 | 72 | |
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73 | 73 | opener.unlink(journal) |
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74 | 74 | backuppath = "%s.backupfiles" % journal |
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75 | 75 | if opener.exists(backuppath): |
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76 | 76 | opener.unlink(backuppath) |
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77 | 77 | try: |
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78 | 78 | for f in backupfiles: |
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79 | 79 | if opener.exists(f): |
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80 | 80 | opener.unlink(f) |
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81 | 81 | except (IOError, OSError, util.Abort), inst: |
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82 | 82 | # only pure backup file remains, it is sage to ignore any error |
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83 | 83 | pass |
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84 | 84 | |
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85 | 85 | class transaction(object): |
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86 | 86 | def __init__(self, report, opener, vfsmap, journal, after=None, |
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87 | 87 | createmode=None, onclose=None, onabort=None): |
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88 | 88 | """Begin a new transaction |
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89 | 89 | |
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90 | 90 | Begins a new transaction that allows rolling back writes in the event of |
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91 | 91 | an exception. |
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92 | 92 | |
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93 | 93 | * `after`: called after the transaction has been committed |
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94 | 94 | * `createmode`: the mode of the journal file that will be created |
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95 | 95 | * `onclose`: called as the transaction is closing, but before it is |
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96 | 96 | closed |
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97 | 97 | * `onabort`: called as the transaction is aborting, but before any files |
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98 | 98 | have been truncated |
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99 | 99 | """ |
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100 | 100 | self.count = 1 |
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101 | 101 | self.usages = 1 |
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102 | 102 | self.report = report |
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103 | 103 | # a vfs to the store content |
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104 | 104 | self.opener = opener |
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105 | 105 | # a map to access file in various {location -> vfs} |
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106 | 106 | vfsmap = vfsmap.copy() |
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107 | 107 | vfsmap[''] = opener # set default value |
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108 | 108 | self._vfsmap = vfsmap |
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109 | 109 | self.after = after |
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110 | 110 | self.onclose = onclose |
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111 | 111 | self.onabort = onabort |
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112 | 112 | self.entries = [] |
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113 | 113 | self.map = {} |
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114 | 114 | self.journal = journal |
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115 | 115 | self._queue = [] |
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116 | 116 | # a dict of arguments to be passed to hooks |
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117 | 117 | self.hookargs = {} |
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118 | 118 | self.file = opener.open(self.journal, "w") |
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119 | 119 | |
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120 | 120 | # a list of ('location', 'path', 'backuppath', cache) entries. |
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121 | 121 | # - if 'backuppath' is empty, no file existed at backup time |
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122 | 122 | # - if 'path' is empty, this is a temporary transaction file |
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123 | 123 | # - if 'location' is not empty, the path is outside main opener reach. |
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124 | 124 | # use 'location' value as a key in a vfsmap to find the right 'vfs' |
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125 | 125 | # (cache is currently unused) |
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126 | 126 | self._backupentries = [] |
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127 | 127 | self._backupmap = {} |
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128 | 128 | self._backupjournal = "%s.backupfiles" % journal |
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129 | 129 | self._backupsfile = opener.open(self._backupjournal, 'w') |
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130 | 130 | self._backupsfile.write('%d\n' % version) |
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131 | 131 | |
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132 | 132 | if createmode is not None: |
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133 | 133 | opener.chmod(self.journal, createmode & 0666) |
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134 | 134 | opener.chmod(self._backupjournal, createmode & 0666) |
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135 | 135 | |
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136 | 136 | # hold file generations to be performed on commit |
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137 | 137 | self._filegenerators = {} |
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138 | 138 | # hold callbalk to write pending data for hooks |
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139 | 139 | self._pendingcallback = {} |
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140 | 140 | # True is any pending data have been written ever |
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141 | 141 | self._anypending = False |
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142 | 142 | # holds callback to call when writing the transaction |
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143 | 143 | self._finalizecallback = {} |
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144 | 144 | # hold callbalk for post transaction close |
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145 | 145 | self._postclosecallback = {} |
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146 | 146 | |
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147 | 147 | def __del__(self): |
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148 | 148 | if self.journal: |
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149 | 149 | self._abort() |
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150 | 150 | |
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151 | 151 | @active |
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152 | 152 | def startgroup(self): |
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153 | 153 | """delay registration of file entry |
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154 | 154 | |
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155 | 155 | This is used by strip to delay vision of strip offset. The transaction |
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156 | 156 | sees either none or all of the strip actions to be done.""" |
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157 | 157 | self._queue.append([]) |
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158 | 158 | |
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159 | 159 | @active |
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160 | 160 | def endgroup(self): |
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161 | 161 | """apply delayed registration of file entry. |
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162 | 162 | |
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163 | 163 | This is used by strip to delay vision of strip offset. The transaction |
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164 | 164 | sees either none or all of the strip actions to be done.""" |
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165 | 165 | q = self._queue.pop() |
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166 | 166 | for f, o, data in q: |
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167 | 167 | self._addentry(f, o, data) |
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168 | 168 | |
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169 | 169 | @active |
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170 | 170 | def add(self, file, offset, data=None): |
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171 | 171 | """record the state of an append-only file before update""" |
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172 | 172 | if file in self.map or file in self._backupmap: |
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173 | 173 | return |
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174 | 174 | if self._queue: |
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175 | 175 | self._queue[-1].append((file, offset, data)) |
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176 | 176 | return |
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177 | 177 | |
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178 | 178 | self._addentry(file, offset, data) |
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179 | 179 | |
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180 | 180 | def _addentry(self, file, offset, data): |
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181 | 181 | """add a append-only entry to memory and on-disk state""" |
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182 | 182 | if file in self.map or file in self._backupmap: |
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183 | 183 | return |
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184 | 184 | self.entries.append((file, offset, data)) |
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185 | 185 | self.map[file] = len(self.entries) - 1 |
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186 | 186 | # add enough data to the journal to do the truncate |
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187 | 187 | self.file.write("%s\0%d\n" % (file, offset)) |
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188 | 188 | self.file.flush() |
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189 | 189 | |
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190 | 190 | @active |
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191 | 191 | def addbackup(self, file, hardlink=True, location=''): |
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192 | 192 | """Adds a backup of the file to the transaction |
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193 | 193 | |
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194 | 194 | Calling addbackup() creates a hardlink backup of the specified file |
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195 | 195 | that is used to recover the file in the event of the transaction |
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196 | 196 | aborting. |
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197 | 197 | |
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198 | 198 | * `file`: the file path, relative to .hg/store |
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199 | 199 | * `hardlink`: use a hardlink to quickly create the backup |
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200 | 200 | """ |
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201 | 201 | if self._queue: |
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202 | 202 | msg = 'cannot use transaction.addbackup inside "group"' |
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203 | 203 | raise RuntimeError(msg) |
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204 | 204 | |
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205 | 205 | if file in self.map or file in self._backupmap: |
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206 | 206 | return |
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207 | 207 | dirname, filename = os.path.split(file) |
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208 | 208 | backupfilename = "%s.backup.%s" % (self.journal, filename) |
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209 | 209 | backupfile = os.path.join(dirname, backupfilename) |
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210 | 210 | vfs = self._vfsmap[location] |
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211 | 211 | if vfs.exists(file): |
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212 | 212 | filepath = vfs.join(file) |
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213 | 213 | backuppath = vfs.join(backupfile) |
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214 | 214 | util.copyfiles(filepath, backuppath, hardlink=hardlink) |
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215 | 215 | else: |
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216 | 216 | backupfile = '' |
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217 | 217 | |
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218 | 218 | self._addbackupentry((location, file, backupfile, False)) |
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219 | 219 | |
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220 | 220 | def _addbackupentry(self, entry): |
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221 | 221 | """register a new backup entry and write it to disk""" |
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222 | 222 | self._backupentries.append(entry) |
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223 | 223 | self._backupmap[file] = len(self._backupentries) - 1 |
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224 | 224 | self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
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225 | 225 | self._backupsfile.flush() |
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226 | 226 | |
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227 | 227 | @active |
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228 | def registertmp(self, tmpfile): | |
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228 | def registertmp(self, tmpfile, location=''): | |
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229 | 229 | """register a temporary transaction file |
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230 | 230 | |
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231 | 231 | Such file will be delete when the transaction exit (on both failure and |
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232 | 232 | success). |
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233 | 233 | """ |
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234 |
self._addbackupentry(( |
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234 | self._addbackupentry((location, '', tmpfile, False)) | |
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235 | 235 | |
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236 | 236 | @active |
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237 | 237 | def addfilegenerator(self, genid, filenames, genfunc, order=0, |
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238 | 238 | location=''): |
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239 | 239 | """add a function to generates some files at transaction commit |
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240 | 240 | |
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241 | 241 | The `genfunc` argument is a function capable of generating proper |
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242 | 242 | content of each entry in the `filename` tuple. |
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243 | 243 | |
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244 | 244 | At transaction close time, `genfunc` will be called with one file |
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245 | 245 | object argument per entries in `filenames`. |
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246 | 246 | |
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247 | 247 | The transaction itself is responsible for the backup, creation and |
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248 | 248 | final write of such file. |
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249 | 249 | |
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250 | 250 | The `genid` argument is used to ensure the same set of file is only |
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251 | 251 | generated once. Call to `addfilegenerator` for a `genid` already |
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252 | 252 | present will overwrite the old entry. |
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253 | 253 | |
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254 | 254 | The `order` argument may be used to control the order in which multiple |
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255 | 255 | generator will be executed. |
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256 | 256 | |
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257 | 257 | The `location` arguments may be used to indicate the files are located |
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258 | 258 | outside of the the standard directory for transaction. It should match |
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259 | 259 | one of the key of the `transaction.vfsmap` dictionnary. |
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260 | 260 | """ |
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261 | 261 | # For now, we are unable to do proper backup and restore of custom vfs |
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262 | 262 | # but for bookmarks that are handled outside this mechanism. |
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263 | 263 | self._filegenerators[genid] = (order, filenames, genfunc, location) |
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264 | 264 | |
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265 | 265 | def _generatefiles(self): |
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266 | 266 | # write files registered for generation |
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267 | 267 | for entry in sorted(self._filegenerators.values()): |
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268 | 268 | order, filenames, genfunc, location = entry |
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269 | 269 | vfs = self._vfsmap[location] |
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270 | 270 | files = [] |
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271 | 271 | try: |
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272 | 272 | for name in filenames: |
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273 | 273 | self.addbackup(name, location=location) |
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274 | 274 | files.append(vfs(name, 'w', atomictemp=True)) |
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275 | 275 | genfunc(*files) |
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276 | 276 | finally: |
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277 | 277 | for f in files: |
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278 | 278 | f.close() |
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279 | 279 | |
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280 | 280 | @active |
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281 | 281 | def find(self, file): |
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282 | 282 | if file in self.map: |
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283 | 283 | return self.entries[self.map[file]] |
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284 | 284 | if file in self._backupmap: |
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285 | 285 | return self._backupentries[self._backupmap[file]] |
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286 | 286 | return None |
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287 | 287 | |
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288 | 288 | @active |
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289 | 289 | def replace(self, file, offset, data=None): |
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290 | 290 | ''' |
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291 | 291 | replace can only replace already committed entries |
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292 | 292 | that are not pending in the queue |
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293 | 293 | ''' |
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294 | 294 | |
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295 | 295 | if file not in self.map: |
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296 | 296 | raise KeyError(file) |
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297 | 297 | index = self.map[file] |
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298 | 298 | self.entries[index] = (file, offset, data) |
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299 | 299 | self.file.write("%s\0%d\n" % (file, offset)) |
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300 | 300 | self.file.flush() |
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301 | 301 | |
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302 | 302 | @active |
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303 | 303 | def nest(self): |
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304 | 304 | self.count += 1 |
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305 | 305 | self.usages += 1 |
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306 | 306 | return self |
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307 | 307 | |
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308 | 308 | def release(self): |
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309 | 309 | if self.count > 0: |
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310 | 310 | self.usages -= 1 |
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311 | 311 | # if the transaction scopes are left without being closed, fail |
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312 | 312 | if self.count > 0 and self.usages == 0: |
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313 | 313 | self._abort() |
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314 | 314 | |
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315 | 315 | def running(self): |
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316 | 316 | return self.count > 0 |
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317 | 317 | |
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318 | 318 | def addpending(self, category, callback): |
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319 | 319 | """add a callback to be called when the transaction is pending |
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320 | 320 | |
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321 | 321 | The transaction will be given as callback's first argument. |
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322 | 322 | |
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323 | 323 | Category is a unique identifier to allow overwriting an old callback |
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324 | 324 | with a newer callback. |
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325 | 325 | """ |
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326 | 326 | self._pendingcallback[category] = callback |
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327 | 327 | |
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328 | 328 | @active |
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329 | 329 | def writepending(self): |
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330 | 330 | '''write pending file to temporary version |
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331 | 331 | |
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332 | 332 | This is used to allow hooks to view a transaction before commit''' |
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333 | 333 | categories = sorted(self._pendingcallback) |
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334 | 334 | for cat in categories: |
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335 | 335 | # remove callback since the data will have been flushed |
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336 | 336 | any = self._pendingcallback.pop(cat)(self) |
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337 | 337 | self._anypending = self._anypending or any |
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338 | 338 | return self._anypending |
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339 | 339 | |
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340 | 340 | @active |
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341 | 341 | def addfinalize(self, category, callback): |
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342 | 342 | """add a callback to be called when the transaction is closed |
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343 | 343 | |
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344 | 344 | The transaction will be given as callback's first argument. |
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345 | 345 | |
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346 | 346 | Category is a unique identifier to allow overwriting old callbacks with |
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347 | 347 | newer callbacks. |
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348 | 348 | """ |
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349 | 349 | self._finalizecallback[category] = callback |
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350 | 350 | |
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351 | 351 | @active |
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352 | 352 | def addpostclose(self, category, callback): |
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353 | 353 | """add a callback to be called after the transaction is closed |
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354 | 354 | |
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355 | 355 | The transaction will be given as callback's first argument. |
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356 | 356 | |
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357 | 357 | Category is a unique identifier to allow overwriting an old callback |
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358 | 358 | with a newer callback. |
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359 | 359 | """ |
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360 | 360 | self._postclosecallback[category] = callback |
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361 | 361 | |
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362 | 362 | @active |
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363 | 363 | def close(self): |
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364 | 364 | '''commit the transaction''' |
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365 | 365 | if self.count == 1: |
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366 | 366 | self._generatefiles() |
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367 | 367 | categories = sorted(self._finalizecallback) |
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368 | 368 | for cat in categories: |
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369 | 369 | self._finalizecallback[cat](self) |
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370 | 370 | if self.onclose is not None: |
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371 | 371 | self.onclose() |
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372 | 372 | |
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373 | 373 | self.count -= 1 |
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374 | 374 | if self.count != 0: |
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375 | 375 | return |
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376 | 376 | self.file.close() |
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377 | 377 | self._backupsfile.close() |
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378 | 378 | # cleanup temporary files |
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379 | 379 | for l, f, b, c in self._backupentries: |
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380 | 380 | if l not in self._vfsmap and c: |
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381 | 381 | self.report("couldn't remote %s: unknown cache location %s\n" |
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382 | 382 | % (b, l)) |
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383 | 383 | continue |
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384 | 384 | vfs = self._vfsmap[l] |
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385 | 385 | if not f and b and vfs.exists(b): |
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386 | 386 | try: |
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387 | 387 | vfs.unlink(b) |
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388 | 388 | except (IOError, OSError, util.Abort), inst: |
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389 | 389 | if not c: |
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390 | 390 | raise |
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391 | 391 | # Abort may be raise by read only opener |
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392 | 392 | self.report("couldn't remote %s: %s\n" |
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393 | 393 | % (vfs.join(b), inst)) |
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394 | 394 | self.entries = [] |
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395 | 395 | if self.after: |
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396 | 396 | self.after() |
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397 | 397 | if self.opener.isfile(self.journal): |
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398 | 398 | self.opener.unlink(self.journal) |
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399 | 399 | if self.opener.isfile(self._backupjournal): |
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400 | 400 | self.opener.unlink(self._backupjournal) |
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401 | 401 | for _l, _f, b, c in self._backupentries: |
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402 | 402 | if l not in self._vfsmap and c: |
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403 | 403 | self.report("couldn't remote %s: unknown cache location" |
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404 | 404 | "%s\n" % (b, l)) |
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405 | 405 | continue |
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406 | 406 | vfs = self._vfsmap[l] |
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407 | 407 | if b and vfs.exists(b): |
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408 | 408 | try: |
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409 | 409 | vfs.unlink(b) |
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410 | 410 | except (IOError, OSError, util.Abort), inst: |
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411 | 411 | if not c: |
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412 | 412 | raise |
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413 | 413 | # Abort may be raise by read only opener |
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414 | 414 | self.report("couldn't remote %s: %s\n" |
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415 | 415 | % (vfs.join(b), inst)) |
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416 | 416 | self._backupentries = [] |
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417 | 417 | self.journal = None |
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418 | 418 | # run post close action |
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419 | 419 | categories = sorted(self._postclosecallback) |
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420 | 420 | for cat in categories: |
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421 | 421 | self._postclosecallback[cat](self) |
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422 | 422 | |
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423 | 423 | @active |
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424 | 424 | def abort(self): |
|
425 | 425 | '''abort the transaction (generally called on error, or when the |
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426 | 426 | transaction is not explicitly committed before going out of |
|
427 | 427 | scope)''' |
|
428 | 428 | self._abort() |
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429 | 429 | |
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430 | 430 | def _abort(self): |
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431 | 431 | self.count = 0 |
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432 | 432 | self.usages = 0 |
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433 | 433 | self.file.close() |
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434 | 434 | self._backupsfile.close() |
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435 | 435 | |
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436 | 436 | if self.onabort is not None: |
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437 | 437 | self.onabort() |
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438 | 438 | |
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439 | 439 | try: |
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440 | 440 | if not self.entries and not self._backupentries: |
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441 | 441 | if self.journal: |
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442 | 442 | self.opener.unlink(self.journal) |
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443 | 443 | if self._backupjournal: |
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444 | 444 | self.opener.unlink(self._backupjournal) |
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445 | 445 | return |
|
446 | 446 | |
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447 | 447 | self.report(_("transaction abort!\n")) |
|
448 | 448 | |
|
449 | 449 | try: |
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450 | 450 | _playback(self.journal, self.report, self.opener, self._vfsmap, |
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451 | 451 | self.entries, self._backupentries, False) |
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452 | 452 | self.report(_("rollback completed\n")) |
|
453 | 453 | except Exception: |
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454 | 454 | self.report(_("rollback failed - please run hg recover\n")) |
|
455 | 455 | finally: |
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456 | 456 | self.journal = None |
|
457 | 457 | |
|
458 | 458 | |
|
459 | 459 | def rollback(opener, vfsmap, file, report): |
|
460 | 460 | """Rolls back the transaction contained in the given file |
|
461 | 461 | |
|
462 | 462 | Reads the entries in the specified file, and the corresponding |
|
463 | 463 | '*.backupfiles' file, to recover from an incomplete transaction. |
|
464 | 464 | |
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465 | 465 | * `file`: a file containing a list of entries, specifying where |
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466 | 466 | to truncate each file. The file should contain a list of |
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467 | 467 | file\0offset pairs, delimited by newlines. The corresponding |
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468 | 468 | '*.backupfiles' file should contain a list of file\0backupfile |
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469 | 469 | pairs, delimited by \0. |
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470 | 470 | """ |
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471 | 471 | entries = [] |
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472 | 472 | backupentries = [] |
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473 | 473 | |
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474 | 474 | fp = opener.open(file) |
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475 | 475 | lines = fp.readlines() |
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476 | 476 | fp.close() |
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477 | 477 | for l in lines: |
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478 | 478 | try: |
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479 | 479 | f, o = l.split('\0') |
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480 | 480 | entries.append((f, int(o), None)) |
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481 | 481 | except ValueError: |
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482 | 482 | report(_("couldn't read journal entry %r!\n") % l) |
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483 | 483 | |
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484 | 484 | backupjournal = "%s.backupfiles" % file |
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485 | 485 | if opener.exists(backupjournal): |
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486 | 486 | fp = opener.open(backupjournal) |
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487 | 487 | lines = fp.readlines() |
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488 | 488 | if lines: |
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489 | 489 | ver = lines[0][:-1] |
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490 | 490 | if ver == str(version): |
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491 | 491 | for line in lines[1:]: |
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492 | 492 | if line: |
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493 | 493 | # Shave off the trailing newline |
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494 | 494 | line = line[:-1] |
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495 | 495 | l, f, b, c = line.split('\0') |
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496 | 496 | backupentries.append((l, f, b, bool(c))) |
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497 | 497 | else: |
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498 | 498 | report(_("journal was created by a different version of " |
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499 | 499 | "Mercurial")) |
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500 | 500 | |
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501 | 501 | _playback(file, report, opener, vfsmap, entries, backupentries) |
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