Mercurial > public > mercurial-scm > hg

annotate mercurial/filelog.py @ 40005:1d97a332c6d9

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storageutil: extract copy metadata retrieval out of filelog As part of implementing an alternate storage backend, I found myself reinventing this wheel. Let's create a utility function for doing the work. Differential Revision: https://phab.mercurial-scm.org/D4800
author Gregory Szorc <gregory.szorc@gmail.com>
date Fri, 28 Sep 2018 11:37:49 -0700
parents 0e8836be9541
children 422beffd71ba
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1 # filelog.py - file history class for mercurial
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2 #
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 from . import (
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11 error,
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12 repository,
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13 revlog,
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14 )
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15 from .utils import (
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16 interfaceutil,
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17 storageutil,
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18 )
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19
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20 @interfaceutil.implementer(repository.ifilestorage)
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21 class filelog(object):
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22 def __init__(self, opener, path):
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23 self._revlog = revlog.revlog(opener,
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24 '/'.join(('data', path + '.i')),
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25 censorable=True)
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26 # Full name of the user visible file, relative to the repository root.
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27 # Used by LFS.
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28 self._revlog.filename = path
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29
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30 def __len__(self):
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31 return len(self._revlog)
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32
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33 def __iter__(self):
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34 return self._revlog.__iter__()
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35
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36 def revs(self, start=0, stop=None):
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37 return self._revlog.revs(start=start, stop=stop)
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38
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39 def parents(self, node):
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40 return self._revlog.parents(node)
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41
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42 def parentrevs(self, rev):
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43 return self._revlog.parentrevs(rev)
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44
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45 def rev(self, node):
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46 return self._revlog.rev(node)
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47
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48 def node(self, rev):
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49 return self._revlog.node(rev)
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50
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51 def lookup(self, node):
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52 return storageutil.fileidlookup(self._revlog, node,
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53 self._revlog.indexfile)
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54
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55 def linkrev(self, rev):
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56 return self._revlog.linkrev(rev)
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57
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58 def commonancestorsheads(self, node1, node2):
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59 return self._revlog.commonancestorsheads(node1, node2)
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60
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61 # Used by dagop.blockdescendants().
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62 def descendants(self, revs):
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63 return self._revlog.descendants(revs)
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64
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65 def heads(self, start=None, stop=None):
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66 return self._revlog.heads(start, stop)
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67
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68 # Used by hgweb, children extension.
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69 def children(self, node):
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70 return self._revlog.children(node)
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71
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72 def iscensored(self, rev):
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73 return self._revlog.iscensored(rev)
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74
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75 def revision(self, node, _df=None, raw=False):
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76 return self._revlog.revision(node, _df=_df, raw=raw)
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77
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78 def emitrevisions(self, nodes, nodesorder=None,
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79 revisiondata=False, assumehaveparentrevisions=False,
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80 deltaprevious=False):
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81 return self._revlog.emitrevisions(
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82 nodes, nodesorder=nodesorder, revisiondata=revisiondata,
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83 assumehaveparentrevisions=assumehaveparentrevisions,
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84 deltaprevious=deltaprevious)
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85
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86 def addrevision(self, revisiondata, transaction, linkrev, p1, p2,
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87 node=None, flags=revlog.REVIDX_DEFAULT_FLAGS,
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88 cachedelta=None):
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89 return self._revlog.addrevision(revisiondata, transaction, linkrev,
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90 p1, p2, node=node, flags=flags,
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91 cachedelta=cachedelta)
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92
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93 def addgroup(self, deltas, linkmapper, transaction, addrevisioncb=None):
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94 return self._revlog.addgroup(deltas, linkmapper, transaction,
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95 addrevisioncb=addrevisioncb)
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96
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97 def getstrippoint(self, minlink):
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98 return self._revlog.getstrippoint(minlink)
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99
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100 def strip(self, minlink, transaction):
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101 return self._revlog.strip(minlink, transaction)
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102
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103 def censorrevision(self, tr, node, tombstone=b''):
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104 return self._revlog.censorrevision(node, tombstone=tombstone)
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105
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106 def files(self):
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107 return self._revlog.files()
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108
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109 def read(self, node):
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110 return storageutil.filtermetadata(self.revision(node))
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111
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112 def add(self, text, meta, transaction, link, p1=None, p2=None):
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113 if meta or text.startswith('\1\n'):
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114 text = storageutil.packmeta(meta, text)
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115 return self.addrevision(text, transaction, link, p1, p2)
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116
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117 def renamed(self, node):
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118 return storageutil.filerevisioncopied(self, node)
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119
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120 def size(self, rev):
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121 """return the size of a given revision"""
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122
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123 # for revisions with renames, we have to go the slow way
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124 node = self.node(rev)
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125 if self.renamed(node):
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126 return len(self.read(node))
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127 if self.iscensored(rev):
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128 return 0
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129
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130 # XXX if self.read(node).startswith("\1\n"), this returns (size+4)
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131 return self._revlog.size(rev)
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132
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133 def cmp(self, node, text):
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134 """compare text with a given file revision
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135
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136 returns True if text is different than what is stored.
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137 """
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138
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139 t = text
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140 if text.startswith('\1\n'):
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141 t = '\1\n\1\n' + text
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142
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143 samehashes = not self._revlog.cmp(node, t)
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144 if samehashes:
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145 return False
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146
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147 # censored files compare against the empty file
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148 if self.iscensored(self.rev(node)):
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149 return text != ''
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150
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151 # renaming a file produces a different hash, even if the data
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152 # remains unchanged. Check if it's the case (slow):
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153 if self.renamed(node):
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154 t2 = self.read(node)
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155 return t2 != text
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156
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157 return True
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158
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159 def verifyintegrity(self, state):
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160 return self._revlog.verifyintegrity(state)
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161
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162 def storageinfo(self, exclusivefiles=False, sharedfiles=False,
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163 revisionscount=False, trackedsize=False,
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164 storedsize=False):
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165 return self._revlog.storageinfo(
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166 exclusivefiles=exclusivefiles, sharedfiles=sharedfiles,
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167 revisionscount=revisionscount, trackedsize=trackedsize,
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168 storedsize=storedsize)
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169
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170 # TODO these aren't part of the interface and aren't internal methods.
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171 # Callers should be fixed to not use them.
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172
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173 # Used by bundlefilelog, unionfilelog.
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174 @property
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175 def indexfile(self):
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176 return self._revlog.indexfile
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177
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178 @indexfile.setter
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179 def indexfile(self, value):
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180 self._revlog.indexfile = value
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181
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182 # Used by repo upgrade.
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183 def clone(self, tr, destrevlog, **kwargs):
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184 if not isinstance(destrevlog, filelog):
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185 raise error.ProgrammingError('expected filelog to clone()')
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186
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187 return self._revlog.clone(tr, destrevlog._revlog, **kwargs)
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188
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189 class narrowfilelog(filelog):
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190 """Filelog variation to be used with narrow stores."""
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191
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192 def __init__(self, opener, path, narrowmatch):
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193 super(narrowfilelog, self).__init__(opener, path)
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194 self._narrowmatch = narrowmatch
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195
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196 def renamed(self, node):
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197 res = super(narrowfilelog, self).renamed(node)
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198
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199 # Renames that come from outside the narrowspec are problematic
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200 # because we may lack the base text for the rename. This can result
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201 # in code attempting to walk the ancestry or compute a diff
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diff changeset
202 # encountering a missing revision. We address this by silently
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203 # removing rename metadata if the source file is outside the
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204 # narrow spec.
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205 #
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206 # A better solution would be to see if the base revision is available,
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207 # rather than assuming it isn't.
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208 #
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209 # An even better solution would be to teach all consumers of rename
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210 # metadata that the base revision may not be available.
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211 #
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212 # TODO consider better ways of doing this.
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213 if res and not self._narrowmatch(res[0]):
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214 return None
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215
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216 return res
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217
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218 def size(self, rev):
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219 # Because we have a custom renamed() that may lie, we need to call
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220 # the base renamed() to report accurate results.
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221 node = self.node(rev)
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222 if super(narrowfilelog, self).renamed(node):
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223 return len(self.read(node))
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224 else:
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225 return super(narrowfilelog, self).size(rev)
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226
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227 def cmp(self, node, text):
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diff changeset
228 different = super(narrowfilelog, self).cmp(node, text)
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229
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230 # Because renamed() may lie, we may get false positives for
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231 # different content. Check for this by comparing against the original
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232 # renamed() implementation.
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233 if different:
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diff changeset
234 if super(narrowfilelog, self).renamed(node):
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235 t2 = self.read(node)
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236 return t2 != text
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237
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238 return different