Mercurial > hg
annotate mercurial/transaction.py @ 35997:24f05489377b
rebase: make "successors" a set in _computeobsoletenotrebased()
There's no apparent reason for this variable to be a list and this
avoids converting it to a set when needed.
author | Denis Laxalde <denis@laxalde.org> |
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date | Sat, 10 Feb 2018 19:33:19 +0100 |
parents | aad39713ef35 |
children | ef345f9e4295 |
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 |
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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 = { |
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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, checkambigfiles=None): |
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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 checkambig = checkambigfiles and (f, '') in checkambigfiles |
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51 try: |
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52 fp = opener(f, 'a', checkambig=checkambig) |
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53 fp.truncate(o) |
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54 fp.close() |
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55 except IOError: |
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56 report(_("failed to truncate %s\n") % f) |
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57 raise |
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58 else: |
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59 try: |
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60 opener.unlink(f) |
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61 except (IOError, OSError) as inst: |
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62 if inst.errno != errno.ENOENT: |
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63 raise |
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64 |
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65 backupfiles = [] |
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66 for l, f, b, c in backupentries: |
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67 if l not in vfsmap and c: |
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68 report("couldn't handle %s: unknown cache location %s\n" |
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69 % (b, l)) |
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70 vfs = vfsmap[l] |
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71 try: |
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72 if f and b: |
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73 filepath = vfs.join(f) |
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74 backuppath = vfs.join(b) |
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75 checkambig = checkambigfiles and (f, l) in checkambigfiles |
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76 try: |
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77 util.copyfile(backuppath, filepath, checkambig=checkambig) |
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78 backupfiles.append(b) |
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79 except IOError: |
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80 report(_("failed to recover %s\n") % f) |
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81 else: |
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82 target = f or b |
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83 try: |
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84 vfs.unlink(target) |
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85 except (IOError, OSError) as inst: |
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86 if inst.errno != errno.ENOENT: |
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87 raise |
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88 except (IOError, OSError, error.Abort) as inst: |
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89 if not c: |
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90 raise |
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91 |
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92 backuppath = "%s.backupfiles" % journal |
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93 if opener.exists(backuppath): |
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94 opener.unlink(backuppath) |
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95 opener.unlink(journal) |
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96 try: |
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97 for f in backupfiles: |
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98 if opener.exists(f): |
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99 opener.unlink(f) |
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100 except (IOError, OSError, error.Abort) as inst: |
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101 # only pure backup file remains, it is sage to ignore any error |
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102 pass |
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103 |
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104 class transaction(util.transactional): |
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105 def __init__(self, report, opener, vfsmap, journalname, undoname=None, |
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106 after=None, createmode=None, validator=None, releasefn=None, |
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107 checkambigfiles=None): |
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108 """Begin a new transaction |
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109 |
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110 Begins a new transaction that allows rolling back writes in the event of |
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111 an exception. |
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112 |
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113 * `after`: called after the transaction has been committed |
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114 * `createmode`: the mode of the journal file that will be created |
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115 * `releasefn`: called after releasing (with transaction and result) |
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116 |
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117 `checkambigfiles` is a set of (path, vfs-location) tuples, |
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118 which determine whether file stat ambiguity should be avoided |
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119 for corresponded files. |
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120 """ |
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121 self.count = 1 |
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122 self.usages = 1 |
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124 # a vfs to the store content |
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125 self.opener = opener |
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126 # a map to access file in various {location -> vfs} |
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127 vfsmap = vfsmap.copy() |
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128 vfsmap[''] = opener # set default value |
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129 self._vfsmap = vfsmap |
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131 self.entries = [] |
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132 self.map = {} |
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133 self.journal = journalname |
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134 self.undoname = undoname |
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135 self._queue = [] |
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136 # A callback to validate transaction content before closing it. |
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137 # should raise exception is anything is wrong. |
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138 # target user is repository hooks. |
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139 if validator is None: |
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140 validator = lambda tr: None |
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141 self.validator = validator |
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142 # A callback to do something just after releasing transaction. |
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143 if releasefn is None: |
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144 releasefn = lambda tr, success: None |
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145 self.releasefn = releasefn |
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146 |
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147 self.checkambigfiles = set() |
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148 if checkambigfiles: |
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149 self.checkambigfiles.update(checkambigfiles) |
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150 |
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151 # A dict dedicated to precisely tracking the changes introduced in the |
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152 # transaction. |
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153 self.changes = {} |
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154 |
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155 # a dict of arguments to be passed to hooks |
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156 self.hookargs = {} |
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157 self.file = opener.open(self.journal, "w") |
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158 |
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159 # a list of ('location', 'path', 'backuppath', cache) entries. |
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160 # - if 'backuppath' is empty, no file existed at backup time |
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161 # - if 'path' is empty, this is a temporary transaction file |
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162 # - if 'location' is not empty, the path is outside main opener reach. |
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163 # use 'location' value as a key in a vfsmap to find the right 'vfs' |
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164 # (cache is currently unused) |
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165 self._backupentries = [] |
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166 self._backupmap = {} |
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167 self._backupjournal = "%s.backupfiles" % self.journal |
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168 self._backupsfile = opener.open(self._backupjournal, 'w') |
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169 self._backupsfile.write('%d\n' % version) |
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170 |
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171 if createmode is not None: |
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172 opener.chmod(self.journal, createmode & 0o666) |
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173 opener.chmod(self._backupjournal, createmode & 0o666) |
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174 |
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175 # hold file generations to be performed on commit |
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176 self._filegenerators = {} |
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177 # hold callback to write pending data for hooks |
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178 self._pendingcallback = {} |
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179 # True is any pending data have been written ever |
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180 self._anypending = False |
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181 # holds callback to call when writing the transaction |
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182 self._finalizecallback = {} |
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183 # hold callback for post transaction close |
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184 self._postclosecallback = {} |
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185 # holds callbacks to call during abort |
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186 self._abortcallback = {} |
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187 |
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188 def __del__(self): |
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189 if self.journal: |
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190 self._abort() |
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191 |
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192 @active |
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193 def startgroup(self): |
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194 """delay registration of file entry |
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195 |
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196 This is used by strip to delay vision of strip offset. The transaction |
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197 sees either none or all of the strip actions to be done.""" |
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198 self._queue.append([]) |
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199 |
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200 @active |
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201 def endgroup(self): |
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202 """apply delayed registration of file entry. |
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203 |
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204 This is used by strip to delay vision of strip offset. The transaction |
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205 sees either none or all of the strip actions to be done.""" |
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206 q = self._queue.pop() |
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207 for f, o, data in q: |
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208 self._addentry(f, o, data) |
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209 |
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210 @active |
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212 """record the state of an append-only file before update""" |
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213 if file in self.map or file in self._backupmap: |
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214 return |
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215 if self._queue: |
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216 self._queue[-1].append((file, offset, data)) |
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217 return |
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218 |
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219 self._addentry(file, offset, data) |
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220 |
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221 def _addentry(self, file, offset, data): |
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222 """add a append-only entry to memory and on-disk state""" |
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223 if file in self.map or file in self._backupmap: |
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224 return |
2084 | 225 self.entries.append((file, offset, data)) |
226 self.map[file] = len(self.entries) - 1 | |
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227 # add enough data to the journal to do the truncate |
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228 self.file.write("%s\0%d\n" % (file, offset)) |
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229 self.file.flush() |
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230 |
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231 @active |
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232 def addbackup(self, file, hardlink=True, location=''): |
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233 """Adds a backup of the file to the transaction |
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234 |
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235 Calling addbackup() creates a hardlink backup of the specified file |
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236 that is used to recover the file in the event of the transaction |
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237 aborting. |
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238 |
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239 * `file`: the file path, relative to .hg/store |
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240 * `hardlink`: use a hardlink to quickly create the backup |
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241 """ |
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242 if self._queue: |
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243 msg = 'cannot use transaction.addbackup inside "group"' |
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245 |
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246 if file in self.map or file in self._backupmap: |
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247 return |
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248 vfs = self._vfsmap[location] |
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249 dirname, filename = vfs.split(file) |
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250 backupfilename = "%s.backup.%s" % (self.journal, filename) |
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251 backupfile = vfs.reljoin(dirname, backupfilename) |
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252 if vfs.exists(file): |
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253 filepath = vfs.join(file) |
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254 backuppath = vfs.join(backupfile) |
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255 util.copyfile(filepath, backuppath, hardlink=hardlink) |
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256 else: |
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257 backupfile = '' |
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258 |
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259 self._addbackupentry((location, file, backupfile, False)) |
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260 |
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261 def _addbackupentry(self, entry): |
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262 """register a new backup entry and write it to disk""" |
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263 self._backupentries.append(entry) |
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264 self._backupmap[entry[1]] = len(self._backupentries) - 1 |
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265 self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
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266 self._backupsfile.flush() |
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267 |
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268 @active |
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269 def registertmp(self, tmpfile, location=''): |
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270 """register a temporary transaction file |
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271 |
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272 Such files will be deleted when the transaction exits (on both |
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273 failure and success). |
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274 """ |
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275 self._addbackupentry((location, '', tmpfile, False)) |
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276 |
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277 @active |
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278 def addfilegenerator(self, genid, filenames, genfunc, order=0, |
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279 location=''): |
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280 """add a function to generates some files at transaction commit |
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281 |
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282 The `genfunc` argument is a function capable of generating proper |
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283 content of each entry in the `filename` tuple. |
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284 |
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285 At transaction close time, `genfunc` will be called with one file |
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286 object argument per entries in `filenames`. |
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287 |
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288 The transaction itself is responsible for the backup, creation and |
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289 final write of such file. |
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290 |
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291 The `genid` argument is used to ensure the same set of file is only |
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292 generated once. Call to `addfilegenerator` for a `genid` already |
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293 present will overwrite the old entry. |
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294 |
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295 The `order` argument may be used to control the order in which multiple |
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296 generator will be executed. |
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297 |
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298 The `location` arguments may be used to indicate the files are located |
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299 outside of the the standard directory for transaction. It should match |
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300 one of the key of the `transaction.vfsmap` dictionary. |
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301 """ |
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302 # For now, we are unable to do proper backup and restore of custom vfs |
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303 # but for bookmarks that are handled outside this mechanism. |
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304 self._filegenerators[genid] = (order, filenames, genfunc, location) |
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305 |
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306 @active |
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307 def removefilegenerator(self, genid): |
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308 """reverse of addfilegenerator, remove a file generator function""" |
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309 if genid in self._filegenerators: |
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310 del self._filegenerators[genid] |
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311 |
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312 def _generatefiles(self, suffix='', group=gengroupall): |
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313 # write files registered for generation |
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314 any = False |
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315 for id, entry in sorted(self._filegenerators.iteritems()): |
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316 any = True |
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317 order, filenames, genfunc, location = entry |
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318 |
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319 # for generation at closing, check if it's before or after finalize |
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320 postfinalize = group == gengrouppostfinalize |
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321 if (group != gengroupall and |
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322 (id in postfinalizegenerators) != (postfinalize)): |
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323 continue |
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324 |
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325 vfs = self._vfsmap[location] |
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326 files = [] |
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327 try: |
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328 for name in filenames: |
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329 name += suffix |
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330 if suffix: |
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331 self.registertmp(name, location=location) |
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332 checkambig = False |
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333 else: |
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334 self.addbackup(name, location=location) |
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335 checkambig = (name, location) in self.checkambigfiles |
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336 files.append(vfs(name, 'w', atomictemp=True, |
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337 checkambig=checkambig)) |
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338 genfunc(*files) |
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339 finally: |
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340 for f in files: |
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341 f.close() |
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342 return any |
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343 |
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344 @active |
2084 | 345 def find(self, file): |
346 if file in self.map: | |
347 return self.entries[self.map[file]] | |
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348 if file in self._backupmap: |
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349 return self._backupentries[self._backupmap[file]] |
2084 | 350 return None |
351 | |
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352 @active |
2084 | 353 def replace(self, file, offset, data=None): |
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354 ''' |
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355 replace can only replace already committed entries |
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356 that are not pending in the queue |
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357 ''' |
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358 |
2084 | 359 if file not in self.map: |
360 raise KeyError(file) | |
361 index = self.map[file] | |
362 self.entries[index] = (file, offset, data) | |
363 self.file.write("%s\0%d\n" % (file, offset)) | |
364 self.file.flush() | |
365 | |
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366 @active |
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367 def nest(self): |
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368 self.count += 1 |
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369 self.usages += 1 |
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370 return self |
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371 |
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372 def release(self): |
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373 if self.count > 0: |
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374 self.usages -= 1 |
11685 | 375 # if the transaction scopes are left without being closed, fail |
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376 if self.count > 0 and self.usages == 0: |
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377 self._abort() |
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378 |
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379 def running(self): |
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380 return self.count > 0 |
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381 |
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382 def addpending(self, category, callback): |
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383 """add a callback to be called when the transaction is pending |
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384 |
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385 The transaction will be given as callback's first argument. |
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386 |
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387 Category is a unique identifier to allow overwriting an old callback |
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388 with a newer callback. |
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389 """ |
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390 self._pendingcallback[category] = callback |
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391 |
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392 @active |
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393 def writepending(self): |
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394 '''write pending file to temporary version |
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395 |
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396 This is used to allow hooks to view a transaction before commit''' |
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397 categories = sorted(self._pendingcallback) |
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398 for cat in categories: |
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399 # remove callback since the data will have been flushed |
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400 any = self._pendingcallback.pop(cat)(self) |
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401 self._anypending = self._anypending or any |
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402 self._anypending |= self._generatefiles(suffix='.pending') |
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403 return self._anypending |
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404 |
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405 @active |
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406 def addfinalize(self, category, callback): |
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407 """add a callback to be called when the transaction is closed |
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408 |
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409 The transaction will be given as callback's first argument. |
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410 |
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411 Category is a unique identifier to allow overwriting old callbacks with |
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412 newer callbacks. |
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413 """ |
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414 self._finalizecallback[category] = callback |
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415 |
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416 @active |
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417 def addpostclose(self, category, callback): |
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418 """add or replace a callback to be called after the transaction closed |
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419 |
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420 The transaction will be given as callback's first argument. |
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421 |
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422 Category is a unique identifier to allow overwriting an old callback |
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423 with a newer callback. |
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424 """ |
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425 self._postclosecallback[category] = callback |
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426 |
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427 @active |
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428 def getpostclose(self, category): |
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429 """return a postclose callback added before, or None""" |
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430 return self._postclosecallback.get(category, None) |
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431 |
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432 @active |
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433 def addabort(self, category, callback): |
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434 """add a callback to be called when the transaction is aborted. |
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435 |
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436 The transaction will be given as the first argument to the callback. |
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437 |
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438 Category is a unique identifier to allow overwriting an old callback |
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439 with a newer callback. |
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440 """ |
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441 self._abortcallback[category] = callback |
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442 |
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443 @active |
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444 def close(self): |
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445 '''commit the transaction''' |
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446 if self.count == 1: |
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447 self.validator(self) # will raise exception if needed |
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448 self.validator = None # Help prevent cycles. |
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449 self._generatefiles(group=gengroupprefinalize) |
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450 categories = sorted(self._finalizecallback) |
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451 for cat in categories: |
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452 self._finalizecallback[cat](self) |
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453 # Prevent double usage and help clear cycles. |
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454 self._finalizecallback = None |
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455 self._generatefiles(group=gengrouppostfinalize) |
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456 |
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457 self.count -= 1 |
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458 if self.count != 0: |
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459 return |
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460 self.file.close() |
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461 self._backupsfile.close() |
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462 # cleanup temporary files |
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463 for l, f, b, c in self._backupentries: |
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464 if l not in self._vfsmap and c: |
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465 self.report("couldn't remove %s: unknown cache location %s\n" |
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466 % (b, l)) |
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467 continue |
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468 vfs = self._vfsmap[l] |
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469 if not f and b and vfs.exists(b): |
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470 try: |
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471 vfs.unlink(b) |
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472 except (IOError, OSError, error.Abort) as inst: |
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473 if not c: |
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474 raise |
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475 # Abort may be raise by read only opener |
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476 self.report("couldn't remove %s: %s\n" |
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477 % (vfs.join(b), inst)) |
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478 self.entries = [] |
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479 self._writeundo() |
95 | 480 if self.after: |
785 | 481 self.after() |
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482 self.after = None # Help prevent cycles. |
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483 if self.opener.isfile(self._backupjournal): |
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484 self.opener.unlink(self._backupjournal) |
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485 if self.opener.isfile(self.journal): |
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486 self.opener.unlink(self.journal) |
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487 for l, _f, b, c in self._backupentries: |
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488 if l not in self._vfsmap and c: |
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489 self.report("couldn't remove %s: unknown cache location" |
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490 "%s\n" % (b, l)) |
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491 continue |
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492 vfs = self._vfsmap[l] |
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493 if b and vfs.exists(b): |
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494 try: |
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495 vfs.unlink(b) |
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496 except (IOError, OSError, error.Abort) as inst: |
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497 if not c: |
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498 raise |
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499 # Abort may be raise by read only opener |
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500 self.report("couldn't remove %s: %s\n" |
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501 % (vfs.join(b), inst)) |
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502 self._backupentries = [] |
573 | 503 self.journal = None |
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504 |
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505 self.releasefn(self, True) # notify success of closing transaction |
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506 self.releasefn = None # Help prevent cycles. |
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507 |
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508 # run post close action |
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509 categories = sorted(self._postclosecallback) |
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510 for cat in categories: |
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511 self._postclosecallback[cat](self) |
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512 # Prevent double usage and help clear cycles. |
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513 self._postclosecallback = None |
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514 |
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515 @active |
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516 def abort(self): |
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517 '''abort the transaction (generally called on error, or when the |
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518 transaction is not explicitly committed before going out of |
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519 scope)''' |
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520 self._abort() |
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521 |
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522 def _writeundo(self): |
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523 """write transaction data for possible future undo call""" |
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524 if self.undoname is None: |
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525 return |
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526 undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') |
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527 undobackupfile.write('%d\n' % version) |
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528 for l, f, b, c in self._backupentries: |
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529 if not f: # temporary file |
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530 continue |
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531 if not b: |
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532 u = '' |
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533 else: |
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534 if l not in self._vfsmap and c: |
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535 self.report("couldn't remove %s: unknown cache location" |
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536 "%s\n" % (b, l)) |
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537 continue |
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538 vfs = self._vfsmap[l] |
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539 base, name = vfs.split(b) |
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540 assert name.startswith(self.journal), name |
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541 uname = name.replace(self.journal, self.undoname, 1) |
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542 u = vfs.reljoin(base, uname) |
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543 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) |
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544 undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) |
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545 undobackupfile.close() |
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546 |
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547 |
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548 def _abort(self): |
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549 self.count = 0 |
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550 self.usages = 0 |
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551 self.file.close() |
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552 self._backupsfile.close() |
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553 |
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554 try: |
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555 if not self.entries and not self._backupentries: |
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556 if self._backupjournal: |
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557 self.opener.unlink(self._backupjournal) |
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558 if self.journal: |
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559 self.opener.unlink(self.journal) |
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560 return |
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561 |
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562 self.report(_("transaction abort!\n")) |
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563 |
108 | 564 try: |
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565 for cat in sorted(self._abortcallback): |
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566 self._abortcallback[cat](self) |
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567 # Prevent double usage and help clear cycles. |
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568 self._abortcallback = None |
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569 _playback(self.journal, self.report, self.opener, self._vfsmap, |
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570 self.entries, self._backupentries, False, |
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571 checkambigfiles=self.checkambigfiles) |
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572 self.report(_("rollback completed\n")) |
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573 except BaseException: |
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574 self.report(_("rollback failed - please run hg recover\n")) |
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575 finally: |
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576 self.journal = None |
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577 self.releasefn(self, False) # notify failure of transaction |
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578 self.releasefn = None # Help prevent cycles. |
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579 |
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580 def rollback(opener, vfsmap, file, report, checkambigfiles=None): |
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581 """Rolls back the transaction contained in the given file |
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582 |
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583 Reads the entries in the specified file, and the corresponding |
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584 '*.backupfiles' file, to recover from an incomplete transaction. |
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585 |
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586 * `file`: a file containing a list of entries, specifying where |
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587 to truncate each file. The file should contain a list of |
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588 file\0offset pairs, delimited by newlines. The corresponding |
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589 '*.backupfiles' file should contain a list of file\0backupfile |
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590 pairs, delimited by \0. |
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591 |
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592 `checkambigfiles` is a set of (path, vfs-location) tuples, |
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593 which determine whether file stat ambiguity should be avoided at |
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594 restoring corresponded files. |
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595 """ |
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596 entries = [] |
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597 backupentries = [] |
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598 |
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599 fp = opener.open(file) |
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600 lines = fp.readlines() |
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601 fp.close() |
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602 for l in lines: |
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603 try: |
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604 f, o = l.split('\0') |
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605 entries.append((f, int(o), None)) |
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606 except ValueError: |
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607 report(_("couldn't read journal entry %r!\n") % l) |
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608 |
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609 backupjournal = "%s.backupfiles" % file |
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610 if opener.exists(backupjournal): |
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611 fp = opener.open(backupjournal) |
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612 lines = fp.readlines() |
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613 if lines: |
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614 ver = lines[0][:-1] |
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615 if ver == (b'%d' % version): |
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616 for line in lines[1:]: |
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617 if line: |
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618 # Shave off the trailing newline |
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619 line = line[:-1] |
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620 l, f, b, c = line.split('\0') |
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621 backupentries.append((l, f, b, bool(c))) |
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622 else: |
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623 report(_("journal was created by a different version of " |
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624 "Mercurial\n")) |
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625 |
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626 _playback(file, report, opener, vfsmap, entries, backupentries, |
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627 checkambigfiles=checkambigfiles) |