Mercurial > hg
annotate hgext/remotefilelog/contentstore.py @ 50225:53ca3e3bc013 stable
rhg: fix race when a fixup file is deleted on disk
See next changeset for the other race in the same kind of logic and why
there are two different places.
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Mon, 27 Feb 2023 15:18:50 +0100 |
parents | d44e3c45f0e4 |
children | 862e3a13da44 |
rev | line source |
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1 import threading |
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2 |
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3 from mercurial.node import ( |
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4 hex, |
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5 sha1nodeconstants, |
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6 ) |
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7 from mercurial.pycompat import getattr |
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8 from mercurial import ( |
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9 mdiff, |
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10 revlog, |
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11 ) |
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12 from . import ( |
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13 basestore, |
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14 constants, |
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15 shallowutil, |
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16 ) |
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17 |
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18 |
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19 class ChainIndicies: |
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20 """A static class for easy reference to the delta chain indicies.""" |
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21 |
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22 # The filename of this revision delta |
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23 NAME = 0 |
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24 # The mercurial file node for this revision delta |
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25 NODE = 1 |
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26 # The filename of the delta base's revision. This is useful when delta |
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27 # between different files (like in the case of a move or copy, we can delta |
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28 # against the original file content). |
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29 BASENAME = 2 |
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30 # The mercurial file node for the delta base revision. This is the nullid if |
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31 # this delta is a full text. |
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32 BASENODE = 3 |
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33 # The actual delta or full text data. |
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34 DATA = 4 |
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35 |
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36 |
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37 class unioncontentstore(basestore.baseunionstore): |
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38 def __init__(self, *args, **kwargs): |
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39 super(unioncontentstore, self).__init__(*args, **kwargs) |
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40 |
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41 self.stores = args |
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42 self.writestore = kwargs.get('writestore') |
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43 |
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44 # If allowincomplete==True then the union store can return partial |
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45 # delta chains, otherwise it will throw a KeyError if a full |
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46 # deltachain can't be found. |
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47 self.allowincomplete = kwargs.get('allowincomplete', False) |
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48 |
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49 def get(self, name, node): |
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50 """Fetches the full text revision contents of the given name+node pair. |
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51 If the full text doesn't exist, throws a KeyError. |
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52 |
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53 Under the hood, this uses getdeltachain() across all the stores to build |
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54 up a full chain to produce the full text. |
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55 """ |
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56 chain = self.getdeltachain(name, node) |
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57 |
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58 if chain[-1][ChainIndicies.BASENODE] != sha1nodeconstants.nullid: |
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59 # If we didn't receive a full chain, throw |
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60 raise KeyError((name, hex(node))) |
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61 |
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62 # The last entry in the chain is a full text, so we start our delta |
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63 # applies with that. |
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64 fulltext = chain.pop()[ChainIndicies.DATA] |
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65 |
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66 text = fulltext |
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67 while chain: |
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68 delta = chain.pop()[ChainIndicies.DATA] |
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69 text = mdiff.patches(text, [delta]) |
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70 |
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71 return text |
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72 |
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73 @basestore.baseunionstore.retriable |
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74 def getdelta(self, name, node): |
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75 """Return the single delta entry for the given name/node pair.""" |
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76 for store in self.stores: |
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77 try: |
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78 return store.getdelta(name, node) |
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79 except KeyError: |
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80 pass |
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81 |
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82 raise KeyError((name, hex(node))) |
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83 |
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84 def getdeltachain(self, name, node): |
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85 """Returns the deltachain for the given name/node pair. |
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86 |
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87 Returns an ordered list of: |
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88 |
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89 [(name, node, deltabasename, deltabasenode, deltacontent),...] |
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90 |
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91 where the chain is terminated by a full text entry with a nullid |
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92 deltabasenode. |
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93 """ |
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94 chain = self._getpartialchain(name, node) |
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95 while chain[-1][ChainIndicies.BASENODE] != sha1nodeconstants.nullid: |
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96 x, x, deltabasename, deltabasenode, x = chain[-1] |
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97 try: |
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98 morechain = self._getpartialchain(deltabasename, deltabasenode) |
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99 chain.extend(morechain) |
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100 except KeyError: |
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101 # If we allow incomplete chains, don't throw. |
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102 if not self.allowincomplete: |
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103 raise |
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104 break |
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105 |
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106 return chain |
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107 |
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108 @basestore.baseunionstore.retriable |
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109 def getmeta(self, name, node): |
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110 """Returns the metadata dict for given node.""" |
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111 for store in self.stores: |
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112 try: |
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113 return store.getmeta(name, node) |
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114 except KeyError: |
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115 pass |
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116 raise KeyError((name, hex(node))) |
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117 |
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118 def getmetrics(self): |
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119 metrics = [s.getmetrics() for s in self.stores] |
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120 return shallowutil.sumdicts(*metrics) |
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121 |
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122 @basestore.baseunionstore.retriable |
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123 def _getpartialchain(self, name, node): |
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124 """Returns a partial delta chain for the given name/node pair. |
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125 |
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126 A partial chain is a chain that may not be terminated in a full-text. |
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127 """ |
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128 for store in self.stores: |
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129 try: |
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130 return store.getdeltachain(name, node) |
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131 except KeyError: |
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132 pass |
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133 |
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134 raise KeyError((name, hex(node))) |
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135 |
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136 def add(self, name, node, data): |
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137 raise RuntimeError( |
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138 b"cannot add content only to remotefilelog contentstore" |
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139 ) |
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140 |
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141 def getmissing(self, keys): |
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142 missing = keys |
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143 for store in self.stores: |
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144 if missing: |
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145 missing = store.getmissing(missing) |
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146 return missing |
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147 |
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148 def addremotefilelognode(self, name, node, data): |
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149 if self.writestore: |
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150 self.writestore.addremotefilelognode(name, node, data) |
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151 else: |
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152 raise RuntimeError(b"no writable store configured") |
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153 |
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154 def markledger(self, ledger, options=None): |
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155 for store in self.stores: |
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156 store.markledger(ledger, options) |
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157 |
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158 |
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159 class remotefilelogcontentstore(basestore.basestore): |
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160 def __init__(self, *args, **kwargs): |
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161 super(remotefilelogcontentstore, self).__init__(*args, **kwargs) |
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162 self._threaddata = threading.local() |
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163 |
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164 def get(self, name, node): |
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165 # return raw revision text |
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166 data = self._getdata(name, node) |
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167 |
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168 offset, size, flags = shallowutil.parsesizeflags(data) |
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169 content = data[offset : offset + size] |
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170 |
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171 ancestormap = shallowutil.ancestormap(data) |
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172 p1, p2, linknode, copyfrom = ancestormap[node] |
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173 copyrev = None |
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174 if copyfrom: |
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175 copyrev = hex(p1) |
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176 |
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177 self._updatemetacache(node, size, flags) |
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178 |
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179 # lfs tracks renames in its own metadata, remove hg copy metadata, |
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180 # because copy metadata will be re-added by lfs flag processor. |
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181 if flags & revlog.REVIDX_EXTSTORED: |
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182 copyrev = copyfrom = None |
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183 revision = shallowutil.createrevlogtext(content, copyfrom, copyrev) |
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184 return revision |
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185 |
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186 def getdelta(self, name, node): |
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187 # Since remotefilelog content stores only contain full texts, just |
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188 # return that. |
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189 revision = self.get(name, node) |
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190 return ( |
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191 revision, |
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192 name, |
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193 sha1nodeconstants.nullid, |
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194 self.getmeta(name, node), |
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195 ) |
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196 |
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197 def getdeltachain(self, name, node): |
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198 # Since remotefilelog content stores just contain full texts, we return |
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199 # a fake delta chain that just consists of a single full text revision. |
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200 # The nullid in the deltabasenode slot indicates that the revision is a |
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201 # fulltext. |
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202 revision = self.get(name, node) |
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203 return [(name, node, None, sha1nodeconstants.nullid, revision)] |
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204 |
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205 def getmeta(self, name, node): |
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206 self._sanitizemetacache() |
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207 if node != self._threaddata.metacache[0]: |
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208 data = self._getdata(name, node) |
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209 offset, size, flags = shallowutil.parsesizeflags(data) |
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210 self._updatemetacache(node, size, flags) |
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211 return self._threaddata.metacache[1] |
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212 |
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213 def add(self, name, node, data): |
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214 raise RuntimeError( |
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215 b"cannot add content only to remotefilelog contentstore" |
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216 ) |
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217 |
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218 def _sanitizemetacache(self): |
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219 metacache = getattr(self._threaddata, 'metacache', None) |
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220 if metacache is None: |
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221 self._threaddata.metacache = (None, None) # (node, meta) |
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222 |
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223 def _updatemetacache(self, node, size, flags): |
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224 self._sanitizemetacache() |
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225 if node == self._threaddata.metacache[0]: |
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226 return |
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227 meta = {constants.METAKEYFLAG: flags, constants.METAKEYSIZE: size} |
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228 self._threaddata.metacache = (node, meta) |
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229 |
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230 |
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231 class remotecontentstore: |
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232 def __init__(self, ui, fileservice, shared): |
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233 self._fileservice = fileservice |
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234 # type(shared) is usually remotefilelogcontentstore |
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235 self._shared = shared |
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236 |
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237 def get(self, name, node): |
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238 self._fileservice.prefetch( |
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239 [(name, hex(node))], force=True, fetchdata=True |
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240 ) |
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241 return self._shared.get(name, node) |
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242 |
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243 def getdelta(self, name, node): |
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244 revision = self.get(name, node) |
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245 return ( |
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246 revision, |
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247 name, |
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248 sha1nodeconstants.nullid, |
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249 self._shared.getmeta(name, node), |
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250 ) |
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251 |
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252 def getdeltachain(self, name, node): |
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253 # Since our remote content stores just contain full texts, we return a |
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254 # fake delta chain that just consists of a single full text revision. |
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255 # The nullid in the deltabasenode slot indicates that the revision is a |
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256 # fulltext. |
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257 revision = self.get(name, node) |
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258 return [(name, node, None, sha1nodeconstants.nullid, revision)] |
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259 |
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260 def getmeta(self, name, node): |
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261 self._fileservice.prefetch( |
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262 [(name, hex(node))], force=True, fetchdata=True |
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263 ) |
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264 return self._shared.getmeta(name, node) |
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265 |
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266 def add(self, name, node, data): |
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267 raise RuntimeError(b"cannot add to a remote store") |
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268 |
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269 def getmissing(self, keys): |
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270 return keys |
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271 |
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272 def markledger(self, ledger, options=None): |
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273 pass |
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274 |
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275 |
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276 class manifestrevlogstore: |
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277 def __init__(self, repo): |
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278 self._store = repo.store |
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279 self._svfs = repo.svfs |
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280 self._revlogs = dict() |
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281 self._cl = revlog.revlog(self._svfs, radix=b'00changelog.i') |
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282 self._repackstartlinkrev = 0 |
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283 |
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284 def get(self, name, node): |
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285 return self._revlog(name).rawdata(node) |
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286 |
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287 def getdelta(self, name, node): |
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288 revision = self.get(name, node) |
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289 return revision, name, self._cl.nullid, self.getmeta(name, node) |
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290 |
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291 def getdeltachain(self, name, node): |
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292 revision = self.get(name, node) |
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293 return [(name, node, None, self._cl.nullid, revision)] |
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294 |
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295 def getmeta(self, name, node): |
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296 rl = self._revlog(name) |
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297 rev = rl.rev(node) |
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298 return { |
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299 constants.METAKEYFLAG: rl.flags(rev), |
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300 constants.METAKEYSIZE: rl.rawsize(rev), |
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301 } |
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302 |
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303 def getancestors(self, name, node, known=None): |
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304 if known is None: |
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305 known = set() |
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306 if node in known: |
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307 return [] |
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308 |
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309 rl = self._revlog(name) |
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310 ancestors = {} |
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311 missing = {node} |
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312 for ancrev in rl.ancestors([rl.rev(node)], inclusive=True): |
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313 ancnode = rl.node(ancrev) |
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314 missing.discard(ancnode) |
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315 |
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316 p1, p2 = rl.parents(ancnode) |
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317 if p1 != self._cl.nullid and p1 not in known: |
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318 missing.add(p1) |
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319 if p2 != self._cl.nullid and p2 not in known: |
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320 missing.add(p2) |
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321 |
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322 linknode = self._cl.node(rl.linkrev(ancrev)) |
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323 ancestors[rl.node(ancrev)] = (p1, p2, linknode, b'') |
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324 if not missing: |
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325 break |
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326 return ancestors |
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327 |
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328 def getnodeinfo(self, name, node): |
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329 cl = self._cl |
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330 rl = self._revlog(name) |
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331 parents = rl.parents(node) |
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332 linkrev = rl.linkrev(rl.rev(node)) |
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333 return (parents[0], parents[1], cl.node(linkrev), None) |
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334 |
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335 def add(self, *args): |
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336 raise RuntimeError(b"cannot add to a revlog store") |
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337 |
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338 def _revlog(self, name): |
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339 rl = self._revlogs.get(name) |
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340 if rl is None: |
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341 revlogname = b'00manifesttree' |
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342 if name != b'': |
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343 revlogname = b'meta/%s/00manifest' % name |
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344 rl = revlog.revlog(self._svfs, radix=revlogname) |
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345 self._revlogs[name] = rl |
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346 return rl |
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347 |
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348 def getmissing(self, keys): |
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349 missing = [] |
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350 for name, node in keys: |
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351 mfrevlog = self._revlog(name) |
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352 if node not in mfrevlog.nodemap: |
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353 missing.append((name, node)) |
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354 |
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355 return missing |
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356 |
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357 def setrepacklinkrevrange(self, startrev, endrev): |
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358 self._repackstartlinkrev = startrev |
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359 self._repackendlinkrev = endrev |
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360 |
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361 def markledger(self, ledger, options=None): |
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362 if options and options.get(constants.OPTION_PACKSONLY): |
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363 return |
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364 treename = b'' |
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365 rl = revlog.revlog(self._svfs, radix=b'00manifesttree') |
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366 startlinkrev = self._repackstartlinkrev |
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367 endlinkrev = self._repackendlinkrev |
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368 for rev in range(len(rl) - 1, -1, -1): |
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369 linkrev = rl.linkrev(rev) |
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370 if linkrev < startlinkrev: |
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371 break |
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372 if linkrev > endlinkrev: |
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373 continue |
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374 node = rl.node(rev) |
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375 ledger.markdataentry(self, treename, node) |
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376 ledger.markhistoryentry(self, treename, node) |
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377 |
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378 for t, path, size in self._store.datafiles(): |
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379 if path[:5] != b'meta/' or path[-2:] != b'.i': |
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380 continue |
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381 |
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382 treename = path[5 : -len(b'/00manifest')] |
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383 |
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384 rl = revlog.revlog(self._svfs, indexfile=path[:-2]) |
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385 for rev in range(len(rl) - 1, -1, -1): |
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386 linkrev = rl.linkrev(rev) |
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387 if linkrev < startlinkrev: |
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388 break |
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389 if linkrev > endlinkrev: |
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390 continue |
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391 node = rl.node(rev) |
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392 ledger.markdataentry(self, treename, node) |
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393 ledger.markhistoryentry(self, treename, node) |
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394 |
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395 def cleanup(self, ledger): |
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396 pass |