Mercurial > hg
annotate mercurial/transaction.py @ 35011:a2dfc723b6b5
bundle: allow bundlerepo to support alternative manifest implementations
With our treemanifest logic, the manifests are no longer transported as part of
the changegroup and are no longer stored in a revlog. This means the
self.manifestlog line in bundlerepo.filestart no longer calls
_constructmanifest, and therefore does not consume the manifest portion of the
changegroup, which means filestart is not populated and we result in an infinite
loop.
The fix is to make filestart aware that self.manifestlog might not consume the
changegroup part, and consume it manually if necessary.
There's currently no way to test this in core, but our treemanifest extension
has tests to cover this.
Differential Revision: https://phab.mercurial-scm.org/D1329
author | Durham Goode <durham@fb.com> |
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date | Tue, 07 Nov 2017 10:16:53 -0800 |
parents | bbbbd3c30bfc |
children | aad39713ef35 |
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 == str(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) |