Mercurial > hg
annotate mercurial/transaction.py @ 29268:f200b58497f1
sslutil: reference appropriate config section in messaging
Error messages reference the config section defining the host
fingerprint. Now that we have multiple sections where this config
setting could live, we need to point the user at the appropriate
one.
We default to the new "hostsecurity" section. But we will still
refer them to the "hostfingerprint" section if a value is defined
there.
There are some corner cases where the messaging might be off. e.g.
they could define a SHA-1 fingerprint in both sections. IMO the
messaging needs a massive overhaul. I plan to do this as part
of future refactoring to security settings.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 28 May 2016 12:58:46 -0700 |
parents | 14e683d6b273 |
children | 9b41cfe0af31 |
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 = set([ |
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30 'bookmarks', |
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31 'dirstate' |
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32 ]) |
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33 |
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34 class GenerationGroup(object): |
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35 ALL='all' |
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36 PREFINALIZE='prefinalize' |
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37 POSTFINALIZE='postfinalize' |
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38 |
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39 def active(func): |
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40 def _active(self, *args, **kwds): |
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41 if self.count == 0: |
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42 raise error.Abort(_( |
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43 'cannot use transaction when it is already committed/aborted')) |
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44 return func(self, *args, **kwds) |
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45 return _active |
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46 |
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47 def _playback(journal, report, opener, vfsmap, entries, backupentries, |
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48 unlink=True): |
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49 for f, o, _ignore in entries: |
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50 if o or not unlink: |
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51 try: |
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52 fp = opener(f, 'a') |
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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 try: |
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76 util.copyfile(backuppath, filepath) |
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77 backupfiles.append(b) |
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78 except IOError: |
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79 report(_("failed to recover %s\n") % f) |
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80 else: |
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81 target = f or b |
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82 try: |
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83 vfs.unlink(target) |
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84 except (IOError, OSError) as inst: |
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85 if inst.errno != errno.ENOENT: |
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86 raise |
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87 except (IOError, OSError, error.Abort) as inst: |
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88 if not c: |
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89 raise |
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90 |
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91 backuppath = "%s.backupfiles" % journal |
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92 if opener.exists(backuppath): |
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93 opener.unlink(backuppath) |
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94 opener.unlink(journal) |
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95 try: |
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96 for f in backupfiles: |
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97 if opener.exists(f): |
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98 opener.unlink(f) |
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99 except (IOError, OSError, error.Abort) as inst: |
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100 # only pure backup file remains, it is sage to ignore any error |
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101 pass |
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102 |
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103 class transaction(object): |
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104 def __init__(self, report, opener, vfsmap, journalname, undoname=None, |
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105 after=None, createmode=None, validator=None, releasefn=None): |
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106 """Begin a new transaction |
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107 |
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108 Begins a new transaction that allows rolling back writes in the event of |
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109 an exception. |
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110 |
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111 * `after`: called after the transaction has been committed |
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112 * `createmode`: the mode of the journal file that will be created |
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113 * `releasefn`: called after releasing (with transaction and result) |
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114 """ |
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115 self.count = 1 |
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116 self.usages = 1 |
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118 # a vfs to the store content |
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119 self.opener = opener |
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120 # a map to access file in various {location -> vfs} |
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121 vfsmap = vfsmap.copy() |
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122 vfsmap[''] = opener # set default value |
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123 self._vfsmap = vfsmap |
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125 self.entries = [] |
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126 self.map = {} |
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127 self.journal = journalname |
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128 self.undoname = undoname |
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129 self._queue = [] |
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130 # A callback to validate transaction content before closing it. |
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131 # should raise exception is anything is wrong. |
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132 # target user is repository hooks. |
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133 if validator is None: |
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134 validator = lambda tr: None |
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135 self.validator = validator |
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136 # A callback to do something just after releasing transaction. |
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137 if releasefn is None: |
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138 releasefn = lambda tr, success: None |
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139 self.releasefn = releasefn |
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140 |
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141 # a dict of arguments to be passed to hooks |
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142 self.hookargs = {} |
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143 self.file = opener.open(self.journal, "w") |
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144 |
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145 # a list of ('location', 'path', 'backuppath', cache) entries. |
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146 # - if 'backuppath' is empty, no file existed at backup time |
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147 # - if 'path' is empty, this is a temporary transaction file |
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148 # - if 'location' is not empty, the path is outside main opener reach. |
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149 # use 'location' value as a key in a vfsmap to find the right 'vfs' |
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150 # (cache is currently unused) |
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151 self._backupentries = [] |
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152 self._backupmap = {} |
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153 self._backupjournal = "%s.backupfiles" % self.journal |
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154 self._backupsfile = opener.open(self._backupjournal, 'w') |
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155 self._backupsfile.write('%d\n' % version) |
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156 |
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157 if createmode is not None: |
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158 opener.chmod(self.journal, createmode & 0o666) |
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159 opener.chmod(self._backupjournal, createmode & 0o666) |
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160 |
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161 # hold file generations to be performed on commit |
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162 self._filegenerators = {} |
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163 # hold callback to write pending data for hooks |
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164 self._pendingcallback = {} |
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165 # True is any pending data have been written ever |
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166 self._anypending = False |
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167 # holds callback to call when writing the transaction |
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168 self._finalizecallback = {} |
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169 # hold callback for post transaction close |
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170 self._postclosecallback = {} |
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171 # holds callbacks to call during abort |
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172 self._abortcallback = {} |
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173 |
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174 def __del__(self): |
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175 if self.journal: |
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176 self._abort() |
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177 |
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178 @active |
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179 def startgroup(self): |
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180 """delay registration of file entry |
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181 |
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182 This is used by strip to delay vision of strip offset. The transaction |
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183 sees either none or all of the strip actions to be done.""" |
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184 self._queue.append([]) |
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185 |
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186 @active |
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187 def endgroup(self): |
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188 """apply delayed registration of file entry. |
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189 |
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190 This is used by strip to delay vision of strip offset. The transaction |
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191 sees either none or all of the strip actions to be done.""" |
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192 q = self._queue.pop() |
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193 for f, o, data in q: |
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194 self._addentry(f, o, data) |
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195 |
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196 @active |
2084 | 197 def add(self, file, offset, data=None): |
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198 """record the state of an append-only file before update""" |
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199 if file in self.map or file in self._backupmap: |
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200 return |
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201 if self._queue: |
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202 self._queue[-1].append((file, offset, data)) |
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203 return |
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204 |
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205 self._addentry(file, offset, data) |
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206 |
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207 def _addentry(self, file, offset, data): |
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208 """add a append-only entry to memory and on-disk state""" |
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209 if file in self.map or file in self._backupmap: |
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210 return |
2084 | 211 self.entries.append((file, offset, data)) |
212 self.map[file] = len(self.entries) - 1 | |
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213 # add enough data to the journal to do the truncate |
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214 self.file.write("%s\0%d\n" % (file, offset)) |
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215 self.file.flush() |
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216 |
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217 @active |
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218 def addbackup(self, file, hardlink=True, location=''): |
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219 """Adds a backup of the file to the transaction |
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220 |
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221 Calling addbackup() creates a hardlink backup of the specified file |
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222 that is used to recover the file in the event of the transaction |
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223 aborting. |
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224 |
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225 * `file`: the file path, relative to .hg/store |
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226 * `hardlink`: use a hardlink to quickly create the backup |
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227 """ |
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228 if self._queue: |
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229 msg = 'cannot use transaction.addbackup inside "group"' |
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230 raise RuntimeError(msg) |
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231 |
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232 if file in self.map or file in self._backupmap: |
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233 return |
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234 vfs = self._vfsmap[location] |
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235 dirname, filename = vfs.split(file) |
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236 backupfilename = "%s.backup.%s" % (self.journal, filename) |
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237 backupfile = vfs.reljoin(dirname, backupfilename) |
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238 if vfs.exists(file): |
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239 filepath = vfs.join(file) |
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240 backuppath = vfs.join(backupfile) |
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241 util.copyfile(filepath, backuppath, hardlink=hardlink) |
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242 else: |
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243 backupfile = '' |
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244 |
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245 self._addbackupentry((location, file, backupfile, False)) |
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246 |
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247 def _addbackupentry(self, entry): |
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248 """register a new backup entry and write it to disk""" |
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249 self._backupentries.append(entry) |
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250 self._backupmap[entry[1]] = len(self._backupentries) - 1 |
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251 self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
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252 self._backupsfile.flush() |
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253 |
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254 @active |
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255 def registertmp(self, tmpfile, location=''): |
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256 """register a temporary transaction file |
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257 |
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258 Such files will be deleted when the transaction exits (on both |
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259 failure and success). |
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260 """ |
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261 self._addbackupentry((location, '', tmpfile, False)) |
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262 |
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263 @active |
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264 def addfilegenerator(self, genid, filenames, genfunc, order=0, |
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265 location=''): |
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266 """add a function to generates some files at transaction commit |
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267 |
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268 The `genfunc` argument is a function capable of generating proper |
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269 content of each entry in the `filename` tuple. |
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270 |
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271 At transaction close time, `genfunc` will be called with one file |
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272 object argument per entries in `filenames`. |
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273 |
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274 The transaction itself is responsible for the backup, creation and |
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275 final write of such file. |
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276 |
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277 The `genid` argument is used to ensure the same set of file is only |
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278 generated once. Call to `addfilegenerator` for a `genid` already |
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279 present will overwrite the old entry. |
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280 |
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281 The `order` argument may be used to control the order in which multiple |
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282 generator will be executed. |
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283 |
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284 The `location` arguments may be used to indicate the files are located |
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285 outside of the the standard directory for transaction. It should match |
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286 one of the key of the `transaction.vfsmap` dictionary. |
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287 """ |
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288 # For now, we are unable to do proper backup and restore of custom vfs |
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289 # but for bookmarks that are handled outside this mechanism. |
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290 self._filegenerators[genid] = (order, filenames, genfunc, location) |
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291 |
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292 def _generatefiles(self, suffix='', group=GenerationGroup.ALL): |
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293 # write files registered for generation |
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294 any = False |
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295 for id, entry in sorted(self._filegenerators.iteritems()): |
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296 any = True |
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297 order, filenames, genfunc, location = entry |
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298 |
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299 # for generation at closing, check if it's before or after finalize |
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300 postfinalize = group == GenerationGroup.POSTFINALIZE |
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301 if (group != GenerationGroup.ALL and |
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302 (id in postfinalizegenerators) != (postfinalize)): |
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303 continue |
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304 |
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305 vfs = self._vfsmap[location] |
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306 files = [] |
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307 try: |
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308 for name in filenames: |
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309 name += suffix |
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310 if suffix: |
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311 self.registertmp(name, location=location) |
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312 else: |
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313 self.addbackup(name, location=location) |
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314 files.append(vfs(name, 'w', atomictemp=True)) |
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315 genfunc(*files) |
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316 finally: |
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317 for f in files: |
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318 f.close() |
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319 return any |
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320 |
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321 @active |
2084 | 322 def find(self, file): |
323 if file in self.map: | |
324 return self.entries[self.map[file]] | |
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325 if file in self._backupmap: |
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326 return self._backupentries[self._backupmap[file]] |
2084 | 327 return None |
328 | |
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329 @active |
2084 | 330 def replace(self, file, offset, data=None): |
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331 ''' |
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332 replace can only replace already committed entries |
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333 that are not pending in the queue |
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334 ''' |
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335 |
2084 | 336 if file not in self.map: |
337 raise KeyError(file) | |
338 index = self.map[file] | |
339 self.entries[index] = (file, offset, data) | |
340 self.file.write("%s\0%d\n" % (file, offset)) | |
341 self.file.flush() | |
342 | |
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343 @active |
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344 def nest(self): |
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345 self.count += 1 |
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346 self.usages += 1 |
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347 return self |
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348 |
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349 def release(self): |
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350 if self.count > 0: |
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351 self.usages -= 1 |
11685 | 352 # if the transaction scopes are left without being closed, fail |
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353 if self.count > 0 and self.usages == 0: |
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354 self._abort() |
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355 |
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356 def __enter__(self): |
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357 return self |
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358 |
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359 def __exit__(self, exc_type, exc_val, exc_tb): |
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360 try: |
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361 if exc_type is None: |
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362 self.close() |
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363 finally: |
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364 self.release() |
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365 |
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366 def running(self): |
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367 return self.count > 0 |
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368 |
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369 def addpending(self, category, callback): |
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370 """add a callback to be called when the transaction is pending |
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371 |
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372 The transaction will be given as callback's first argument. |
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373 |
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374 Category is a unique identifier to allow overwriting an old callback |
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375 with a newer callback. |
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376 """ |
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377 self._pendingcallback[category] = callback |
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378 |
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379 @active |
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380 def writepending(self): |
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381 '''write pending file to temporary version |
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382 |
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383 This is used to allow hooks to view a transaction before commit''' |
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384 categories = sorted(self._pendingcallback) |
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385 for cat in categories: |
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386 # remove callback since the data will have been flushed |
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387 any = self._pendingcallback.pop(cat)(self) |
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388 self._anypending = self._anypending or any |
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389 self._anypending |= self._generatefiles(suffix='.pending') |
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390 return self._anypending |
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391 |
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392 @active |
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393 def addfinalize(self, category, callback): |
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394 """add a callback to be called when the transaction is closed |
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395 |
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396 The transaction will be given as callback's first argument. |
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397 |
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398 Category is a unique identifier to allow overwriting old callbacks with |
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399 newer callbacks. |
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400 """ |
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401 self._finalizecallback[category] = callback |
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402 |
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403 @active |
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404 def addpostclose(self, category, callback): |
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405 """add a callback to be called after the transaction is closed |
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406 |
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407 The transaction will be given as callback's first argument. |
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408 |
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409 Category is a unique identifier to allow overwriting an old callback |
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410 with a newer callback. |
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411 """ |
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412 self._postclosecallback[category] = callback |
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413 |
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414 @active |
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415 def addabort(self, category, callback): |
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416 """add a callback to be called when the transaction is aborted. |
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417 |
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418 The transaction will be given as the first argument to the callback. |
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419 |
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420 Category is a unique identifier to allow overwriting an old callback |
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421 with a newer callback. |
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422 """ |
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423 self._abortcallback[category] = callback |
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424 |
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425 @active |
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426 def close(self): |
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427 '''commit the transaction''' |
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428 if self.count == 1: |
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429 self.validator(self) # will raise exception if needed |
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430 self._generatefiles(group=GenerationGroup.PREFINALIZE) |
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431 categories = sorted(self._finalizecallback) |
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432 for cat in categories: |
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433 self._finalizecallback[cat](self) |
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434 # Prevent double usage and help clear cycles. |
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435 self._finalizecallback = None |
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436 self._generatefiles(group=GenerationGroup.POSTFINALIZE) |
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437 |
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438 self.count -= 1 |
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439 if self.count != 0: |
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440 return |
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441 self.file.close() |
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442 self._backupsfile.close() |
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443 # cleanup temporary files |
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444 for l, f, b, c in self._backupentries: |
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445 if l not in self._vfsmap and c: |
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446 self.report("couldn't remove %s: unknown cache location %s\n" |
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447 % (b, l)) |
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448 continue |
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449 vfs = self._vfsmap[l] |
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450 if not f and b and vfs.exists(b): |
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451 try: |
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452 vfs.unlink(b) |
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453 except (IOError, OSError, error.Abort) as inst: |
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454 if not c: |
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455 raise |
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456 # Abort may be raise by read only opener |
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457 self.report("couldn't remove %s: %s\n" |
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458 % (vfs.join(b), inst)) |
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459 self.entries = [] |
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460 self._writeundo() |
95 | 461 if self.after: |
785 | 462 self.after() |
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|
463 if self.opener.isfile(self._backupjournal): |
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464 self.opener.unlink(self._backupjournal) |
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465 if self.opener.isfile(self.journal): |
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466 self.opener.unlink(self.journal) |
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467 for l, _f, b, c in self._backupentries: |
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468 if l not in self._vfsmap and c: |
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469 self.report("couldn't remove %s: unknown cache location" |
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470 "%s\n" % (b, l)) |
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471 continue |
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472 vfs = self._vfsmap[l] |
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473 if b and vfs.exists(b): |
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474 try: |
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475 vfs.unlink(b) |
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476 except (IOError, OSError, error.Abort) as inst: |
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477 if not c: |
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478 raise |
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479 # Abort may be raise by read only opener |
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480 self.report("couldn't remove %s: %s\n" |
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481 % (vfs.join(b), inst)) |
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482 self._backupentries = [] |
573 | 483 self.journal = None |
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484 |
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485 self.releasefn(self, True) # notify success of closing transaction |
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486 |
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487 # run post close action |
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488 categories = sorted(self._postclosecallback) |
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489 for cat in categories: |
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490 self._postclosecallback[cat](self) |
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491 # Prevent double usage and help clear cycles. |
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492 self._postclosecallback = None |
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493 |
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494 @active |
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495 def abort(self): |
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496 '''abort the transaction (generally called on error, or when the |
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497 transaction is not explicitly committed before going out of |
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498 scope)''' |
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499 self._abort() |
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500 |
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501 def _writeundo(self): |
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502 """write transaction data for possible future undo call""" |
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503 if self.undoname is None: |
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504 return |
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505 undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') |
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506 undobackupfile.write('%d\n' % version) |
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507 for l, f, b, c in self._backupentries: |
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508 if not f: # temporary file |
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509 continue |
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510 if not b: |
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511 u = '' |
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512 else: |
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513 if l not in self._vfsmap and c: |
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514 self.report("couldn't remove %s: unknown cache location" |
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515 "%s\n" % (b, l)) |
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516 continue |
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517 vfs = self._vfsmap[l] |
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518 base, name = vfs.split(b) |
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519 assert name.startswith(self.journal), name |
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520 uname = name.replace(self.journal, self.undoname, 1) |
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521 u = vfs.reljoin(base, uname) |
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522 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) |
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523 undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) |
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524 undobackupfile.close() |
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525 |
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526 |
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527 def _abort(self): |
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528 self.count = 0 |
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529 self.usages = 0 |
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530 self.file.close() |
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531 self._backupsfile.close() |
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532 |
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533 try: |
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534 if not self.entries and not self._backupentries: |
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535 if self._backupjournal: |
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536 self.opener.unlink(self._backupjournal) |
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537 if self.journal: |
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538 self.opener.unlink(self.journal) |
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539 return |
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540 |
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541 self.report(_("transaction abort!\n")) |
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542 |
108 | 543 try: |
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544 for cat in sorted(self._abortcallback): |
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545 self._abortcallback[cat](self) |
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546 # Prevent double usage and help clear cycles. |
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547 self._abortcallback = None |
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548 _playback(self.journal, self.report, self.opener, self._vfsmap, |
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549 self.entries, self._backupentries, False) |
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550 self.report(_("rollback completed\n")) |
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551 except BaseException: |
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552 self.report(_("rollback failed - please run hg recover\n")) |
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553 finally: |
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554 self.journal = None |
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555 self.releasefn(self, False) # notify failure of transaction |
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556 |
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557 def rollback(opener, vfsmap, file, report): |
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558 """Rolls back the transaction contained in the given file |
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559 |
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560 Reads the entries in the specified file, and the corresponding |
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561 '*.backupfiles' file, to recover from an incomplete transaction. |
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562 |
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563 * `file`: a file containing a list of entries, specifying where |
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564 to truncate each file. The file should contain a list of |
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565 file\0offset pairs, delimited by newlines. The corresponding |
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566 '*.backupfiles' file should contain a list of file\0backupfile |
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567 pairs, delimited by \0. |
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568 """ |
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569 entries = [] |
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570 backupentries = [] |
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571 |
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572 fp = opener.open(file) |
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573 lines = fp.readlines() |
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574 fp.close() |
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575 for l in lines: |
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576 try: |
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577 f, o = l.split('\0') |
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578 entries.append((f, int(o), None)) |
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579 except ValueError: |
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580 report(_("couldn't read journal entry %r!\n") % l) |
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581 |
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582 backupjournal = "%s.backupfiles" % file |
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583 if opener.exists(backupjournal): |
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584 fp = opener.open(backupjournal) |
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585 lines = fp.readlines() |
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586 if lines: |
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587 ver = lines[0][:-1] |
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588 if ver == str(version): |
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589 for line in lines[1:]: |
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590 if line: |
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591 # Shave off the trailing newline |
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592 line = line[:-1] |
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593 l, f, b, c = line.split('\0') |
7eb520f5efe4
transaction: change the on disk format for backupentries
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
23291
diff
changeset
|
594 backupentries.append((l, f, b, bool(c))) |
23064
5dc888b79e70
transactions: add version number to journal.backupfiles
Durham Goode <durham@fb.com>
parents:
23063
diff
changeset
|
595 else: |
23309
7eb520f5efe4
transaction: change the on disk format for backupentries
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
23291
diff
changeset
|
596 report(_("journal was created by a different version of " |
24721
774ee9800146
transaction: add missing newline to message
Michael O'Connor <moconnor@janestreet.com>
parents:
24283
diff
changeset
|
597 "Mercurial\n")) |
20882
5dffd06f1e50
transaction: add support for non-append files
Durham Goode <durham@fb.com>
parents:
20881
diff
changeset
|
598 |
23311
64ab33ffba14
transaction: use the location value when doing backup
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
23310
diff
changeset
|
599 _playback(file, report, opener, vfsmap, entries, backupentries) |