Mercurial > hg
annotate mercurial/transaction.py @ 24071:184a2f6f40da
bundle2.unbundle20: add compressed() method
Bundlerepo uses the compressed() method to determine whether it should write
an uncompressed temporary file. Since we don't support compressed bundle2 files
at the moment, make this method return true.
author | Eric Sumner <ericsumner@fb.com> |
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date | Thu, 05 Feb 2015 15:56:50 -0800 |
parents | d251da5e0e84 |
children | ef22cfff7052 |
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 version = 2 |
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19 |
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20 def active(func): |
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21 def _active(self, *args, **kwds): |
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22 if self.count == 0: |
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23 raise error.Abort(_( |
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24 'cannot use transaction when it is already committed/aborted')) |
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25 return func(self, *args, **kwds) |
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26 return _active |
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27 |
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28 def _playback(journal, report, opener, vfsmap, entries, backupentries, |
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29 unlink=True): |
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30 for f, o, _ignore in entries: |
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31 if o or not unlink: |
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32 try: |
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33 fp = opener(f, 'a') |
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34 fp.truncate(o) |
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35 fp.close() |
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36 except IOError: |
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37 report(_("failed to truncate %s\n") % f) |
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38 raise |
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39 else: |
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40 try: |
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41 opener.unlink(f) |
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42 except (IOError, OSError), inst: |
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43 if inst.errno != errno.ENOENT: |
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44 raise |
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45 |
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46 backupfiles = [] |
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47 for l, f, b, c in backupentries: |
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48 if l not in vfsmap and c: |
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49 report("couldn't handle %s: unknown cache location %s\n" |
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50 % (b, l)) |
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51 vfs = vfsmap[l] |
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52 try: |
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53 if f and b: |
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54 filepath = vfs.join(f) |
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55 backuppath = vfs.join(b) |
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56 try: |
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57 util.copyfile(backuppath, filepath) |
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58 backupfiles.append(b) |
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59 except IOError: |
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60 report(_("failed to recover %s\n") % f) |
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61 else: |
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62 target = f or b |
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63 try: |
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64 vfs.unlink(target) |
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65 except (IOError, OSError), inst: |
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66 if inst.errno != errno.ENOENT: |
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67 raise |
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68 except (IOError, OSError, util.Abort), inst: |
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69 if not c: |
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70 raise |
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71 |
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72 opener.unlink(journal) |
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73 backuppath = "%s.backupfiles" % journal |
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74 if opener.exists(backuppath): |
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75 opener.unlink(backuppath) |
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76 try: |
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77 for f in backupfiles: |
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78 if opener.exists(f): |
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79 opener.unlink(f) |
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80 except (IOError, OSError, util.Abort), inst: |
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81 # only pure backup file remains, it is sage to ignore any error |
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82 pass |
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83 |
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84 class transaction(object): |
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85 def __init__(self, report, opener, vfsmap, journalname, undoname=None, |
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86 after=None, createmode=None): |
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87 """Begin a new transaction |
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88 |
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89 Begins a new transaction that allows rolling back writes in the event of |
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90 an exception. |
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91 |
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92 * `after`: called after the transaction has been committed |
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93 * `createmode`: the mode of the journal file that will be created |
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94 """ |
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95 self.count = 1 |
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96 self.usages = 1 |
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98 # a vfs to the store content |
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99 self.opener = opener |
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100 # a map to access file in various {location -> vfs} |
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101 vfsmap = vfsmap.copy() |
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102 vfsmap[''] = opener # set default value |
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103 self._vfsmap = vfsmap |
95 | 104 self.after = after |
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105 self.entries = [] |
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106 self.map = {} |
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107 self.journal = journalname |
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108 self.undoname = undoname |
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109 self._queue = [] |
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110 # a dict of arguments to be passed to hooks |
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111 self.hookargs = {} |
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112 self.file = opener.open(self.journal, "w") |
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113 |
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114 # a list of ('location', 'path', 'backuppath', cache) entries. |
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115 # - if 'backuppath' is empty, no file existed at backup time |
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116 # - if 'path' is empty, this is a temporary transaction file |
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117 # - if 'location' is not empty, the path is outside main opener reach. |
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118 # use 'location' value as a key in a vfsmap to find the right 'vfs' |
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119 # (cache is currently unused) |
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120 self._backupentries = [] |
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121 self._backupmap = {} |
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122 self._backupjournal = "%s.backupfiles" % self.journal |
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123 self._backupsfile = opener.open(self._backupjournal, 'w') |
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124 self._backupsfile.write('%d\n' % version) |
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125 |
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126 if createmode is not None: |
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127 opener.chmod(self.journal, createmode & 0666) |
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128 opener.chmod(self._backupjournal, createmode & 0666) |
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129 |
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130 # hold file generations to be performed on commit |
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131 self._filegenerators = {} |
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132 # hold callback to write pending data for hooks |
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133 self._pendingcallback = {} |
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134 # True is any pending data have been written ever |
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135 self._anypending = False |
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136 # holds callback to call when writing the transaction |
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137 self._finalizecallback = {} |
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138 # hold callback for post transaction close |
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139 self._postclosecallback = {} |
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140 # holds callbacks to call during abort |
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141 self._abortcallback = {} |
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142 |
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143 def __del__(self): |
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144 if self.journal: |
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145 self._abort() |
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146 |
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147 @active |
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148 def startgroup(self): |
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149 """delay registration of file entry |
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150 |
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151 This is used by strip to delay vision of strip offset. The transaction |
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152 sees either none or all of the strip actions to be done.""" |
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153 self._queue.append([]) |
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154 |
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155 @active |
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156 def endgroup(self): |
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157 """apply delayed registration of file entry. |
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158 |
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159 This is used by strip to delay vision of strip offset. The transaction |
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160 sees either none or all of the strip actions to be done.""" |
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161 q = self._queue.pop() |
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162 for f, o, data in q: |
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163 self._addentry(f, o, data) |
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164 |
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165 @active |
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167 """record the state of an append-only file before update""" |
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168 if file in self.map or file in self._backupmap: |
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169 return |
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170 if self._queue: |
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171 self._queue[-1].append((file, offset, data)) |
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172 return |
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173 |
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174 self._addentry(file, offset, data) |
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175 |
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176 def _addentry(self, file, offset, data): |
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177 """add a append-only entry to memory and on-disk state""" |
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178 if file in self.map or file in self._backupmap: |
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179 return |
2084 | 180 self.entries.append((file, offset, data)) |
181 self.map[file] = len(self.entries) - 1 | |
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182 # add enough data to the journal to do the truncate |
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183 self.file.write("%s\0%d\n" % (file, offset)) |
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184 self.file.flush() |
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185 |
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186 @active |
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187 def addbackup(self, file, hardlink=True, location=''): |
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188 """Adds a backup of the file to the transaction |
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189 |
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190 Calling addbackup() creates a hardlink backup of the specified file |
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191 that is used to recover the file in the event of the transaction |
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192 aborting. |
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193 |
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194 * `file`: the file path, relative to .hg/store |
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195 * `hardlink`: use a hardlink to quickly create the backup |
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196 """ |
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197 if self._queue: |
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198 msg = 'cannot use transaction.addbackup inside "group"' |
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199 raise RuntimeError(msg) |
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200 |
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201 if file in self.map or file in self._backupmap: |
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202 return |
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203 vfs = self._vfsmap[location] |
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204 dirname, filename = vfs.split(file) |
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205 backupfilename = "%s.backup.%s" % (self.journal, filename) |
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206 backupfile = vfs.reljoin(dirname, backupfilename) |
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207 if vfs.exists(file): |
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208 filepath = vfs.join(file) |
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209 backuppath = vfs.join(backupfile) |
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210 util.copyfile(filepath, backuppath, hardlink=hardlink) |
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211 else: |
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212 backupfile = '' |
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213 |
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214 self._addbackupentry((location, file, backupfile, False)) |
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215 |
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216 def _addbackupentry(self, entry): |
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217 """register a new backup entry and write it to disk""" |
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218 self._backupentries.append(entry) |
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219 self._backupmap[file] = len(self._backupentries) - 1 |
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220 self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
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221 self._backupsfile.flush() |
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222 |
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223 @active |
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224 def registertmp(self, tmpfile, location=''): |
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225 """register a temporary transaction file |
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226 |
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227 Such files will be deleted when the transaction exits (on both |
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228 failure and success). |
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229 """ |
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230 self._addbackupentry((location, '', tmpfile, False)) |
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231 |
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232 @active |
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233 def addfilegenerator(self, genid, filenames, genfunc, order=0, |
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234 location=''): |
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235 """add a function to generates some files at transaction commit |
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236 |
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237 The `genfunc` argument is a function capable of generating proper |
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238 content of each entry in the `filename` tuple. |
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239 |
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240 At transaction close time, `genfunc` will be called with one file |
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241 object argument per entries in `filenames`. |
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242 |
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243 The transaction itself is responsible for the backup, creation and |
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244 final write of such file. |
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245 |
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246 The `genid` argument is used to ensure the same set of file is only |
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247 generated once. Call to `addfilegenerator` for a `genid` already |
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248 present will overwrite the old entry. |
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249 |
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250 The `order` argument may be used to control the order in which multiple |
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251 generator will be executed. |
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252 |
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253 The `location` arguments may be used to indicate the files are located |
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254 outside of the the standard directory for transaction. It should match |
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255 one of the key of the `transaction.vfsmap` dictionary. |
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256 """ |
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257 # For now, we are unable to do proper backup and restore of custom vfs |
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258 # but for bookmarks that are handled outside this mechanism. |
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259 self._filegenerators[genid] = (order, filenames, genfunc, location) |
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260 |
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261 def _generatefiles(self, suffix=''): |
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262 # write files registered for generation |
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263 any = False |
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264 for entry in sorted(self._filegenerators.values()): |
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265 any = True |
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266 order, filenames, genfunc, location = entry |
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267 vfs = self._vfsmap[location] |
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268 files = [] |
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269 try: |
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270 for name in filenames: |
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271 name += suffix |
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272 if suffix: |
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273 self.registertmp(name, location=location) |
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274 else: |
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275 self.addbackup(name, location=location) |
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276 files.append(vfs(name, 'w', atomictemp=True)) |
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277 genfunc(*files) |
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278 finally: |
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279 for f in files: |
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280 f.close() |
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281 return any |
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282 |
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283 @active |
2084 | 284 def find(self, file): |
285 if file in self.map: | |
286 return self.entries[self.map[file]] | |
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287 if file in self._backupmap: |
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288 return self._backupentries[self._backupmap[file]] |
2084 | 289 return None |
290 | |
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291 @active |
2084 | 292 def replace(self, file, offset, data=None): |
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293 ''' |
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294 replace can only replace already committed entries |
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295 that are not pending in the queue |
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296 ''' |
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297 |
2084 | 298 if file not in self.map: |
299 raise KeyError(file) | |
300 index = self.map[file] | |
301 self.entries[index] = (file, offset, data) | |
302 self.file.write("%s\0%d\n" % (file, offset)) | |
303 self.file.flush() | |
304 | |
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305 @active |
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306 def nest(self): |
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307 self.count += 1 |
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308 self.usages += 1 |
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309 return self |
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310 |
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311 def release(self): |
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312 if self.count > 0: |
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313 self.usages -= 1 |
11685 | 314 # if the transaction scopes are left without being closed, fail |
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315 if self.count > 0 and self.usages == 0: |
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316 self._abort() |
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317 |
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318 def running(self): |
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319 return self.count > 0 |
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320 |
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321 def addpending(self, category, callback): |
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322 """add a callback to be called when the transaction is pending |
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323 |
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324 The transaction will be given as callback's first argument. |
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325 |
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326 Category is a unique identifier to allow overwriting an old callback |
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327 with a newer callback. |
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328 """ |
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329 self._pendingcallback[category] = callback |
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330 |
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331 @active |
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332 def writepending(self): |
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333 '''write pending file to temporary version |
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334 |
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335 This is used to allow hooks to view a transaction before commit''' |
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336 categories = sorted(self._pendingcallback) |
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337 for cat in categories: |
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338 # remove callback since the data will have been flushed |
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339 any = self._pendingcallback.pop(cat)(self) |
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340 self._anypending = self._anypending or any |
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341 self._anypending |= self._generatefiles(suffix='.pending') |
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342 return self._anypending |
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343 |
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344 @active |
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345 def addfinalize(self, category, callback): |
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346 """add a callback to be called when the transaction is closed |
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347 |
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348 The transaction will be given as callback's first argument. |
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349 |
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350 Category is a unique identifier to allow overwriting old callbacks with |
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351 newer callbacks. |
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352 """ |
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353 self._finalizecallback[category] = callback |
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354 |
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355 @active |
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356 def addpostclose(self, category, callback): |
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357 """add a callback to be called after the transaction is closed |
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358 |
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359 The transaction will be given as callback's first argument. |
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360 |
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361 Category is a unique identifier to allow overwriting an old callback |
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362 with a newer callback. |
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363 """ |
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364 self._postclosecallback[category] = callback |
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365 |
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366 @active |
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367 def addabort(self, category, callback): |
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368 """add a callback to be called when the transaction is aborted. |
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369 |
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370 The transaction will be given as the first argument to the callback. |
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371 |
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372 Category is a unique identifier to allow overwriting an old callback |
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373 with a newer callback. |
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374 """ |
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375 self._abortcallback[category] = callback |
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376 |
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377 @active |
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378 def close(self): |
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379 '''commit the transaction''' |
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380 if self.count == 1: |
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381 self._generatefiles() |
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382 categories = sorted(self._finalizecallback) |
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383 for cat in categories: |
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384 self._finalizecallback[cat](self) |
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385 |
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386 self.count -= 1 |
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387 if self.count != 0: |
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388 return |
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389 self.file.close() |
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390 self._backupsfile.close() |
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391 # cleanup temporary files |
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392 for l, f, b, c in self._backupentries: |
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393 if l not in self._vfsmap and c: |
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394 self.report("couldn't remote %s: unknown cache location %s\n" |
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395 % (b, l)) |
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396 continue |
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397 vfs = self._vfsmap[l] |
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398 if not f and b and vfs.exists(b): |
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399 try: |
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400 vfs.unlink(b) |
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401 except (IOError, OSError, util.Abort), inst: |
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402 if not c: |
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403 raise |
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404 # Abort may be raise by read only opener |
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405 self.report("couldn't remote %s: %s\n" |
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406 % (vfs.join(b), inst)) |
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407 self.entries = [] |
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408 self._writeundo() |
95 | 409 if self.after: |
785 | 410 self.after() |
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411 if self.opener.isfile(self.journal): |
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412 self.opener.unlink(self.journal) |
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413 if self.opener.isfile(self._backupjournal): |
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414 self.opener.unlink(self._backupjournal) |
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415 for l, _f, b, c in self._backupentries: |
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416 if l not in self._vfsmap and c: |
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417 self.report("couldn't remote %s: unknown cache location" |
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418 "%s\n" % (b, l)) |
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419 continue |
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420 vfs = self._vfsmap[l] |
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421 if b and vfs.exists(b): |
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422 try: |
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423 vfs.unlink(b) |
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424 except (IOError, OSError, util.Abort), inst: |
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425 if not c: |
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426 raise |
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427 # Abort may be raise by read only opener |
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428 self.report("couldn't remote %s: %s\n" |
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429 % (vfs.join(b), inst)) |
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430 self._backupentries = [] |
573 | 431 self.journal = None |
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432 # run post close action |
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433 categories = sorted(self._postclosecallback) |
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434 for cat in categories: |
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435 self._postclosecallback[cat](self) |
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436 |
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437 @active |
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438 def abort(self): |
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439 '''abort the transaction (generally called on error, or when the |
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440 transaction is not explicitly committed before going out of |
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441 scope)''' |
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442 self._abort() |
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443 |
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444 def _writeundo(self): |
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445 """write transaction data for possible future undo call""" |
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446 if self.undoname is None: |
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447 return |
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448 undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') |
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449 undobackupfile.write('%d\n' % version) |
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450 for l, f, b, c in self._backupentries: |
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451 if not f: # temporary file |
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452 continue |
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453 if not b: |
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454 u = '' |
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455 else: |
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456 if l not in self._vfsmap and c: |
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457 self.report("couldn't remote %s: unknown cache location" |
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458 "%s\n" % (b, l)) |
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459 continue |
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460 vfs = self._vfsmap[l] |
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461 base, name = vfs.split(b) |
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462 assert name.startswith(self.journal), name |
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463 uname = name.replace(self.journal, self.undoname, 1) |
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464 u = vfs.reljoin(base, uname) |
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465 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) |
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466 undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) |
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467 undobackupfile.close() |
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468 |
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469 |
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470 def _abort(self): |
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471 self.count = 0 |
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472 self.usages = 0 |
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473 self.file.close() |
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474 self._backupsfile.close() |
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475 |
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476 try: |
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477 if not self.entries and not self._backupentries: |
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478 if self.journal: |
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479 self.opener.unlink(self.journal) |
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480 if self._backupjournal: |
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481 self.opener.unlink(self._backupjournal) |
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482 return |
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483 |
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484 self.report(_("transaction abort!\n")) |
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485 |
108 | 486 try: |
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487 for cat in sorted(self._abortcallback): |
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488 self._abortcallback[cat](self) |
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489 _playback(self.journal, self.report, self.opener, self._vfsmap, |
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490 self.entries, self._backupentries, False) |
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491 self.report(_("rollback completed\n")) |
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492 except Exception: |
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493 self.report(_("rollback failed - please run hg recover\n")) |
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494 finally: |
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495 self.journal = None |
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496 |
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497 |
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498 def rollback(opener, vfsmap, file, report): |
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499 """Rolls back the transaction contained in the given file |
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500 |
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501 Reads the entries in the specified file, and the corresponding |
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502 '*.backupfiles' file, to recover from an incomplete transaction. |
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503 |
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504 * `file`: a file containing a list of entries, specifying where |
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505 to truncate each file. The file should contain a list of |
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506 file\0offset pairs, delimited by newlines. The corresponding |
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507 '*.backupfiles' file should contain a list of file\0backupfile |
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508 pairs, delimited by \0. |
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509 """ |
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510 entries = [] |
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511 backupentries = [] |
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512 |
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513 fp = opener.open(file) |
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514 lines = fp.readlines() |
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515 fp.close() |
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516 for l in lines: |
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517 try: |
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518 f, o = l.split('\0') |
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519 entries.append((f, int(o), None)) |
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520 except ValueError: |
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521 report(_("couldn't read journal entry %r!\n") % l) |
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522 |
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523 backupjournal = "%s.backupfiles" % file |
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524 if opener.exists(backupjournal): |
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525 fp = opener.open(backupjournal) |
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526 lines = fp.readlines() |
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527 if lines: |
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528 ver = lines[0][:-1] |
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529 if ver == str(version): |
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530 for line in lines[1:]: |
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531 if line: |
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532 # Shave off the trailing newline |
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533 line = line[:-1] |
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534 l, f, b, c = line.split('\0') |
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535 backupentries.append((l, f, b, bool(c))) |
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536 else: |
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537 report(_("journal was created by a different version of " |
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538 "Mercurial")) |
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539 |
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540 _playback(file, report, opener, vfsmap, entries, backupentries) |