Mercurial > hg
annotate mercurial/transaction.py @ 32129:f0ea0f642627
py3: make posix.getuser return a bytes
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Fri, 21 Apr 2017 00:53:38 +0530 |
parents | 8defc7d9adae |
children | 976681123416 |
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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 |
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14 from __future__ import absolute_import |
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15 |
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16 import errno |
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17 |
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18 from .i18n import _ |
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19 from . import ( |
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20 error, |
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21 util, |
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22 ) |
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23 |
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24 version = 2 |
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25 |
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26 # These are the file generators that should only be executed after the |
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27 # finalizers are done, since they rely on the output of the finalizers (like |
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28 # the changelog having been written). |
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29 postfinalizegenerators = set([ |
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30 'bookmarks', |
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31 'dirstate' |
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32 ]) |
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33 |
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34 gengroupall='all' |
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35 gengroupprefinalize='prefinalize' |
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36 gengrouppostfinalize='postfinalize' |
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37 |
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38 def active(func): |
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39 def _active(self, *args, **kwds): |
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40 if self.count == 0: |
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41 raise error.Abort(_( |
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42 'cannot use transaction when it is already committed/aborted')) |
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43 return func(self, *args, **kwds) |
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44 return _active |
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45 |
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46 def _playback(journal, report, opener, vfsmap, entries, backupentries, |
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47 unlink=True): |
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48 for f, o, _ignore in entries: |
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49 if o or not unlink: |
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50 try: |
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51 fp = opener(f, 'a', checkambig=True) |
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52 fp.truncate(o) |
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53 fp.close() |
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54 except IOError: |
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55 report(_("failed to truncate %s\n") % f) |
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56 raise |
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57 else: |
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58 try: |
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59 opener.unlink(f) |
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60 except (IOError, OSError) as inst: |
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61 if inst.errno != errno.ENOENT: |
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62 raise |
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63 |
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64 backupfiles = [] |
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65 for l, f, b, c in backupentries: |
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66 if l not in vfsmap and c: |
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67 report("couldn't handle %s: unknown cache location %s\n" |
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68 % (b, l)) |
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69 vfs = vfsmap[l] |
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70 try: |
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71 if f and b: |
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72 filepath = vfs.join(f) |
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73 backuppath = vfs.join(b) |
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74 try: |
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75 util.copyfile(backuppath, filepath, checkambig=True) |
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76 backupfiles.append(b) |
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77 except IOError: |
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78 report(_("failed to recover %s\n") % f) |
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79 else: |
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80 target = f or b |
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81 try: |
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82 vfs.unlink(target) |
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83 except (IOError, OSError) as inst: |
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84 if inst.errno != errno.ENOENT: |
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85 raise |
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86 except (IOError, OSError, error.Abort) as inst: |
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87 if not c: |
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88 raise |
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89 |
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90 backuppath = "%s.backupfiles" % journal |
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91 if opener.exists(backuppath): |
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92 opener.unlink(backuppath) |
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93 opener.unlink(journal) |
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94 try: |
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95 for f in backupfiles: |
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96 if opener.exists(f): |
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97 opener.unlink(f) |
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98 except (IOError, OSError, error.Abort) as inst: |
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99 # only pure backup file remains, it is sage to ignore any error |
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100 pass |
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101 |
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102 class transaction(object): |
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103 def __init__(self, report, opener, vfsmap, journalname, undoname=None, |
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104 after=None, createmode=None, validator=None, releasefn=None): |
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105 """Begin a new transaction |
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106 |
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107 Begins a new transaction that allows rolling back writes in the event of |
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108 an exception. |
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109 |
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110 * `after`: called after the transaction has been committed |
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111 * `createmode`: the mode of the journal file that will be created |
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112 * `releasefn`: called after releasing (with transaction and result) |
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113 """ |
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114 self.count = 1 |
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115 self.usages = 1 |
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117 # a vfs to the store content |
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118 self.opener = opener |
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119 # a map to access file in various {location -> vfs} |
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120 vfsmap = vfsmap.copy() |
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121 vfsmap[''] = opener # set default value |
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122 self._vfsmap = vfsmap |
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124 self.entries = [] |
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125 self.map = {} |
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126 self.journal = journalname |
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127 self.undoname = undoname |
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128 self._queue = [] |
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129 # A callback to validate transaction content before closing it. |
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130 # should raise exception is anything is wrong. |
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131 # target user is repository hooks. |
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132 if validator is None: |
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133 validator = lambda tr: None |
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134 self.validator = validator |
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135 # A callback to do something just after releasing transaction. |
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136 if releasefn is None: |
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137 releasefn = lambda tr, success: None |
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138 self.releasefn = releasefn |
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139 |
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140 # a dict of arguments to be passed to hooks |
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141 self.hookargs = {} |
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142 self.file = opener.open(self.journal, "w") |
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143 |
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144 # a list of ('location', 'path', 'backuppath', cache) entries. |
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145 # - if 'backuppath' is empty, no file existed at backup time |
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146 # - if 'path' is empty, this is a temporary transaction file |
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147 # - if 'location' is not empty, the path is outside main opener reach. |
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148 # use 'location' value as a key in a vfsmap to find the right 'vfs' |
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149 # (cache is currently unused) |
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150 self._backupentries = [] |
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151 self._backupmap = {} |
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152 self._backupjournal = "%s.backupfiles" % self.journal |
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153 self._backupsfile = opener.open(self._backupjournal, 'w') |
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154 self._backupsfile.write('%d\n' % version) |
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155 |
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156 if createmode is not None: |
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157 opener.chmod(self.journal, createmode & 0o666) |
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158 opener.chmod(self._backupjournal, createmode & 0o666) |
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159 |
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160 # hold file generations to be performed on commit |
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161 self._filegenerators = {} |
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162 # hold callback to write pending data for hooks |
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163 self._pendingcallback = {} |
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164 # True is any pending data have been written ever |
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165 self._anypending = False |
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166 # holds callback to call when writing the transaction |
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167 self._finalizecallback = {} |
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168 # hold callback for post transaction close |
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169 self._postclosecallback = {} |
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170 # holds callbacks to call during abort |
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171 self._abortcallback = {} |
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172 |
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173 def __del__(self): |
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174 if self.journal: |
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175 self._abort() |
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176 |
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177 @active |
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178 def startgroup(self): |
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179 """delay registration of file entry |
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180 |
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181 This is used by strip to delay vision of strip offset. The transaction |
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182 sees either none or all of the strip actions to be done.""" |
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183 self._queue.append([]) |
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184 |
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185 @active |
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186 def endgroup(self): |
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187 """apply delayed registration of file entry. |
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188 |
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189 This is used by strip to delay vision of strip offset. The transaction |
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190 sees either none or all of the strip actions to be done.""" |
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191 q = self._queue.pop() |
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192 for f, o, data in q: |
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193 self._addentry(f, o, data) |
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194 |
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195 @active |
2084 | 196 def add(self, file, offset, data=None): |
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197 """record the state of an append-only file before update""" |
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198 if file in self.map or file in self._backupmap: |
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199 return |
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200 if self._queue: |
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201 self._queue[-1].append((file, offset, data)) |
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202 return |
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203 |
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204 self._addentry(file, offset, data) |
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205 |
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206 def _addentry(self, file, offset, data): |
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207 """add a append-only entry to memory and on-disk state""" |
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208 if file in self.map or file in self._backupmap: |
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209 return |
2084 | 210 self.entries.append((file, offset, data)) |
211 self.map[file] = len(self.entries) - 1 | |
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212 # add enough data to the journal to do the truncate |
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213 self.file.write("%s\0%d\n" % (file, offset)) |
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214 self.file.flush() |
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215 |
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216 @active |
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217 def addbackup(self, file, hardlink=True, location=''): |
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218 """Adds a backup of the file to the transaction |
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219 |
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220 Calling addbackup() creates a hardlink backup of the specified file |
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221 that is used to recover the file in the event of the transaction |
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222 aborting. |
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223 |
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224 * `file`: the file path, relative to .hg/store |
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225 * `hardlink`: use a hardlink to quickly create the backup |
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226 """ |
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227 if self._queue: |
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228 msg = 'cannot use transaction.addbackup inside "group"' |
31648 | 229 raise error.ProgrammingError(msg) |
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230 |
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231 if file in self.map or file in self._backupmap: |
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232 return |
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233 vfs = self._vfsmap[location] |
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234 dirname, filename = vfs.split(file) |
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235 backupfilename = "%s.backup.%s" % (self.journal, filename) |
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236 backupfile = vfs.reljoin(dirname, backupfilename) |
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237 if vfs.exists(file): |
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238 filepath = vfs.join(file) |
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239 backuppath = vfs.join(backupfile) |
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240 util.copyfile(filepath, backuppath, hardlink=hardlink) |
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241 else: |
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242 backupfile = '' |
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243 |
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244 self._addbackupentry((location, file, backupfile, False)) |
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245 |
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246 def _addbackupentry(self, entry): |
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247 """register a new backup entry and write it to disk""" |
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248 self._backupentries.append(entry) |
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249 self._backupmap[entry[1]] = len(self._backupentries) - 1 |
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250 self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
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251 self._backupsfile.flush() |
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252 |
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253 @active |
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254 def registertmp(self, tmpfile, location=''): |
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255 """register a temporary transaction file |
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256 |
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257 Such files will be deleted when the transaction exits (on both |
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258 failure and success). |
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259 """ |
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260 self._addbackupentry((location, '', tmpfile, False)) |
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261 |
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262 @active |
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263 def addfilegenerator(self, genid, filenames, genfunc, order=0, |
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264 location=''): |
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265 """add a function to generates some files at transaction commit |
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266 |
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267 The `genfunc` argument is a function capable of generating proper |
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268 content of each entry in the `filename` tuple. |
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269 |
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270 At transaction close time, `genfunc` will be called with one file |
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271 object argument per entries in `filenames`. |
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272 |
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273 The transaction itself is responsible for the backup, creation and |
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274 final write of such file. |
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275 |
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276 The `genid` argument is used to ensure the same set of file is only |
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277 generated once. Call to `addfilegenerator` for a `genid` already |
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278 present will overwrite the old entry. |
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279 |
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280 The `order` argument may be used to control the order in which multiple |
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281 generator will be executed. |
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282 |
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283 The `location` arguments may be used to indicate the files are located |
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284 outside of the the standard directory for transaction. It should match |
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285 one of the key of the `transaction.vfsmap` dictionary. |
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286 """ |
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287 # For now, we are unable to do proper backup and restore of custom vfs |
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288 # but for bookmarks that are handled outside this mechanism. |
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289 self._filegenerators[genid] = (order, filenames, genfunc, location) |
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290 |
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291 def _generatefiles(self, suffix='', group=gengroupall): |
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292 # write files registered for generation |
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293 any = False |
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294 for id, entry in sorted(self._filegenerators.iteritems()): |
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295 any = True |
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296 order, filenames, genfunc, location = entry |
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297 |
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298 # for generation at closing, check if it's before or after finalize |
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299 postfinalize = group == gengrouppostfinalize |
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300 if (group != gengroupall and |
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301 (id in postfinalizegenerators) != (postfinalize)): |
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302 continue |
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303 |
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304 vfs = self._vfsmap[location] |
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305 files = [] |
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306 try: |
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307 for name in filenames: |
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308 name += suffix |
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309 if suffix: |
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310 self.registertmp(name, location=location) |
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311 else: |
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312 self.addbackup(name, location=location) |
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313 files.append(vfs(name, 'w', atomictemp=True, |
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314 checkambig=not suffix)) |
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315 genfunc(*files) |
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316 finally: |
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317 for f in files: |
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318 f.close() |
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319 return any |
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320 |
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321 @active |
2084 | 322 def find(self, file): |
323 if file in self.map: | |
324 return self.entries[self.map[file]] | |
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325 if file in self._backupmap: |
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326 return self._backupentries[self._backupmap[file]] |
2084 | 327 return None |
328 | |
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329 @active |
2084 | 330 def replace(self, file, offset, data=None): |
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331 ''' |
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332 replace can only replace already committed entries |
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333 that are not pending in the queue |
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334 ''' |
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335 |
2084 | 336 if file not in self.map: |
337 raise KeyError(file) | |
338 index = self.map[file] | |
339 self.entries[index] = (file, offset, data) | |
340 self.file.write("%s\0%d\n" % (file, offset)) | |
341 self.file.flush() | |
342 | |
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343 @active |
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344 def nest(self): |
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345 self.count += 1 |
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346 self.usages += 1 |
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347 return self |
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348 |
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349 def release(self): |
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350 if self.count > 0: |
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351 self.usages -= 1 |
11685 | 352 # if the transaction scopes are left without being closed, fail |
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353 if self.count > 0 and self.usages == 0: |
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354 self._abort() |
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355 |
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356 def __enter__(self): |
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357 return self |
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358 |
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359 def __exit__(self, exc_type, exc_val, exc_tb): |
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360 try: |
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361 if exc_type is None: |
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362 self.close() |
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363 finally: |
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364 self.release() |
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365 |
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366 def running(self): |
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367 return self.count > 0 |
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368 |
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369 def addpending(self, category, callback): |
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370 """add a callback to be called when the transaction is pending |
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371 |
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372 The transaction will be given as callback's first argument. |
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373 |
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374 Category is a unique identifier to allow overwriting an old callback |
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375 with a newer callback. |
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376 """ |
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377 self._pendingcallback[category] = callback |
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378 |
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379 @active |
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380 def writepending(self): |
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381 '''write pending file to temporary version |
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382 |
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383 This is used to allow hooks to view a transaction before commit''' |
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384 categories = sorted(self._pendingcallback) |
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385 for cat in categories: |
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386 # remove callback since the data will have been flushed |
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387 any = self._pendingcallback.pop(cat)(self) |
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388 self._anypending = self._anypending or any |
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389 self._anypending |= self._generatefiles(suffix='.pending') |
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390 return self._anypending |
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391 |
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392 @active |
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393 def addfinalize(self, category, callback): |
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394 """add a callback to be called when the transaction is closed |
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395 |
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396 The transaction will be given as callback's first argument. |
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397 |
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398 Category is a unique identifier to allow overwriting old callbacks with |
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399 newer callbacks. |
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400 """ |
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401 self._finalizecallback[category] = callback |
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402 |
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403 @active |
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404 def addpostclose(self, category, callback): |
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405 """add a callback to be called after the transaction is closed |
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406 |
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407 The transaction will be given as callback's first argument. |
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408 |
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409 Category is a unique identifier to allow overwriting an old callback |
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410 with a newer callback. |
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411 """ |
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412 self._postclosecallback[category] = callback |
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413 |
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414 @active |
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415 def addabort(self, category, callback): |
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416 """add a callback to be called when the transaction is aborted. |
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417 |
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418 The transaction will be given as the first argument to the callback. |
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419 |
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420 Category is a unique identifier to allow overwriting an old callback |
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421 with a newer callback. |
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422 """ |
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423 self._abortcallback[category] = callback |
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424 |
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425 @active |
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426 def close(self): |
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427 '''commit the transaction''' |
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428 if self.count == 1: |
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429 self.validator(self) # will raise exception if needed |
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430 self._generatefiles(group=gengroupprefinalize) |
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431 categories = sorted(self._finalizecallback) |
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432 for cat in categories: |
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433 self._finalizecallback[cat](self) |
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434 # Prevent double usage and help clear cycles. |
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435 self._finalizecallback = None |
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436 self._generatefiles(group=gengrouppostfinalize) |
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437 |
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438 self.count -= 1 |
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439 if self.count != 0: |
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440 return |
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441 self.file.close() |
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442 self._backupsfile.close() |
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443 # cleanup temporary files |
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444 for l, f, b, c in self._backupentries: |
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445 if l not in self._vfsmap and c: |
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446 self.report("couldn't remove %s: unknown cache location %s\n" |
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447 % (b, l)) |
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448 continue |
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|
449 vfs = self._vfsmap[l] |
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450 if not f and b and vfs.exists(b): |
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451 try: |
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452 vfs.unlink(b) |
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453 except (IOError, OSError, error.Abort) as inst: |
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454 if not c: |
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455 raise |
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456 # Abort may be raise by read only opener |
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457 self.report("couldn't remove %s: %s\n" |
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458 % (vfs.join(b), inst)) |
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459 self.entries = [] |
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|
460 self._writeundo() |
95 | 461 if self.after: |
785 | 462 self.after() |
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|
463 if self.opener.isfile(self._backupjournal): |
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|
464 self.opener.unlink(self._backupjournal) |
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465 if self.opener.isfile(self.journal): |
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466 self.opener.unlink(self.journal) |
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467 for l, _f, b, c in self._backupentries: |
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468 if l not in self._vfsmap and c: |
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469 self.report("couldn't remove %s: unknown cache location" |
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470 "%s\n" % (b, l)) |
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471 continue |
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472 vfs = self._vfsmap[l] |
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473 if b and vfs.exists(b): |
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474 try: |
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475 vfs.unlink(b) |
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476 except (IOError, OSError, error.Abort) as inst: |
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477 if not c: |
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|
478 raise |
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479 # Abort may be raise by read only opener |
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480 self.report("couldn't remove %s: %s\n" |
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481 % (vfs.join(b), inst)) |
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482 self._backupentries = [] |
573 | 483 self.journal = None |
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484 |
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485 self.releasefn(self, True) # notify success of closing transaction |
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486 |
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487 # run post close action |
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488 categories = sorted(self._postclosecallback) |
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489 for cat in categories: |
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490 self._postclosecallback[cat](self) |
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491 # Prevent double usage and help clear cycles. |
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492 self._postclosecallback = None |
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493 |
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494 @active |
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495 def abort(self): |
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496 '''abort the transaction (generally called on error, or when the |
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497 transaction is not explicitly committed before going out of |
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498 scope)''' |
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499 self._abort() |
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500 |
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501 def _writeundo(self): |
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502 """write transaction data for possible future undo call""" |
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503 if self.undoname is None: |
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504 return |
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505 undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') |
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506 undobackupfile.write('%d\n' % version) |
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507 for l, f, b, c in self._backupentries: |
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508 if not f: # temporary file |
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509 continue |
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510 if not b: |
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511 u = '' |
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512 else: |
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513 if l not in self._vfsmap and c: |
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514 self.report("couldn't remove %s: unknown cache location" |
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515 "%s\n" % (b, l)) |
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516 continue |
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517 vfs = self._vfsmap[l] |
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518 base, name = vfs.split(b) |
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519 assert name.startswith(self.journal), name |
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520 uname = name.replace(self.journal, self.undoname, 1) |
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521 u = vfs.reljoin(base, uname) |
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522 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) |
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523 undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) |
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524 undobackupfile.close() |
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525 |
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526 |
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527 def _abort(self): |
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528 self.count = 0 |
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529 self.usages = 0 |
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530 self.file.close() |
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531 self._backupsfile.close() |
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532 |
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533 try: |
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534 if not self.entries and not self._backupentries: |
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535 if self._backupjournal: |
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536 self.opener.unlink(self._backupjournal) |
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537 if self.journal: |
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538 self.opener.unlink(self.journal) |
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539 return |
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540 |
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541 self.report(_("transaction abort!\n")) |
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542 |
108 | 543 try: |
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544 for cat in sorted(self._abortcallback): |
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545 self._abortcallback[cat](self) |
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546 # Prevent double usage and help clear cycles. |
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547 self._abortcallback = None |
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548 _playback(self.journal, self.report, self.opener, self._vfsmap, |
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549 self.entries, self._backupentries, False) |
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550 self.report(_("rollback completed\n")) |
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551 except BaseException: |
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552 self.report(_("rollback failed - please run hg recover\n")) |
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553 finally: |
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554 self.journal = None |
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555 self.releasefn(self, False) # notify failure of transaction |
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556 |
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557 def rollback(opener, vfsmap, file, report): |
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558 """Rolls back the transaction contained in the given file |
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559 |
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560 Reads the entries in the specified file, and the corresponding |
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561 '*.backupfiles' file, to recover from an incomplete transaction. |
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562 |
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563 * `file`: a file containing a list of entries, specifying where |
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564 to truncate each file. The file should contain a list of |
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565 file\0offset pairs, delimited by newlines. The corresponding |
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566 '*.backupfiles' file should contain a list of file\0backupfile |
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567 pairs, delimited by \0. |
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568 """ |
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569 entries = [] |
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570 backupentries = [] |
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571 |
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572 fp = opener.open(file) |
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573 lines = fp.readlines() |
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574 fp.close() |
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575 for l in lines: |
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576 try: |
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577 f, o = l.split('\0') |
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578 entries.append((f, int(o), None)) |
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579 except ValueError: |
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580 report(_("couldn't read journal entry %r!\n") % l) |
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581 |
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582 backupjournal = "%s.backupfiles" % file |
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583 if opener.exists(backupjournal): |
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584 fp = opener.open(backupjournal) |
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585 lines = fp.readlines() |
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586 if lines: |
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587 ver = lines[0][:-1] |
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588 if ver == str(version): |
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589 for line in lines[1:]: |
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590 if line: |
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591 # Shave off the trailing newline |
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592 line = line[:-1] |
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593 l, f, b, c = line.split('\0') |
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changeset
|
594 backupentries.append((l, f, b, bool(c))) |
23064
5dc888b79e70
transactions: add version number to journal.backupfiles
Durham Goode <durham@fb.com>
parents:
23063
diff
changeset
|
595 else: |
23309
7eb520f5efe4
transaction: change the on disk format for backupentries
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
23291
diff
changeset
|
596 report(_("journal was created by a different version of " |
24721
774ee9800146
transaction: add missing newline to message
Michael O'Connor <moconnor@janestreet.com>
parents:
24283
diff
changeset
|
597 "Mercurial\n")) |
20882
5dffd06f1e50
transaction: add support for non-append files
Durham Goode <durham@fb.com>
parents:
20881
diff
changeset
|
598 |
23311
64ab33ffba14
transaction: use the location value when doing backup
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
23310
diff
changeset
|
599 _playback(file, report, opener, vfsmap, entries, backupentries) |