Mercurial > hg
annotate hgext/remotefilelog/remotefilectx.py @ 41809:e0a3ee3fdb33
tests: add more wildcards to test-extdiff.t
This test has been flakey recently on Windows, but it appears to be the same
scenario as 88d4477ac4f6.
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Mon, 25 Feb 2019 21:10:16 -0500 |
parents | 041d829575ed |
children | 2372284d9457 |
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1 # remotefilectx.py - filectx/workingfilectx implementations for remotefilelog |
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2 # |
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3 # Copyright 2013 Facebook, Inc. |
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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 from __future__ import absolute_import |
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8 |
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9 import collections |
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10 import time |
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11 |
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12 from mercurial.node import bin, hex, nullid, nullrev |
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13 from mercurial import ( |
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14 ancestor, |
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15 context, |
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16 error, |
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17 phases, |
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18 util, |
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19 ) |
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20 from . import shallowutil |
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21 |
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22 propertycache = util.propertycache |
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23 FASTLOG_TIMEOUT_IN_SECS = 0.5 |
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24 |
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25 class remotefilectx(context.filectx): |
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26 def __init__(self, repo, path, changeid=None, fileid=None, |
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27 filelog=None, changectx=None, ancestormap=None): |
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28 if fileid == nullrev: |
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29 fileid = nullid |
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30 if fileid and len(fileid) == 40: |
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31 fileid = bin(fileid) |
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32 super(remotefilectx, self).__init__(repo, path, changeid, |
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33 fileid, filelog, changectx) |
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34 self._ancestormap = ancestormap |
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35 |
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36 def size(self): |
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37 return self._filelog.size(self._filenode) |
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38 |
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39 @propertycache |
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40 def _changeid(self): |
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41 if r'_changeid' in self.__dict__: |
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42 return self._changeid |
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43 elif r'_changectx' in self.__dict__: |
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44 return self._changectx.rev() |
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45 elif r'_descendantrev' in self.__dict__: |
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46 # this file context was created from a revision with a known |
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47 # descendant, we can (lazily) correct for linkrev aliases |
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48 linknode = self._adjustlinknode(self._path, self._filelog, |
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49 self._filenode, self._descendantrev) |
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50 return self._repo.unfiltered().changelog.rev(linknode) |
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51 else: |
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52 return self.linkrev() |
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53 |
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54 def filectx(self, fileid, changeid=None): |
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55 '''opens an arbitrary revision of the file without |
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56 opening a new filelog''' |
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57 return remotefilectx(self._repo, self._path, fileid=fileid, |
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58 filelog=self._filelog, changeid=changeid) |
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59 |
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60 def linkrev(self): |
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61 return self._linkrev |
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62 |
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63 @propertycache |
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64 def _linkrev(self): |
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65 if self._filenode == nullid: |
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66 return nullrev |
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67 |
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68 ancestormap = self.ancestormap() |
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69 p1, p2, linknode, copyfrom = ancestormap[self._filenode] |
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70 rev = self._repo.changelog.nodemap.get(linknode) |
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71 if rev is not None: |
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72 return rev |
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73 |
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74 # Search all commits for the appropriate linkrev (slow, but uncommon) |
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75 path = self._path |
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76 fileid = self._filenode |
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77 cl = self._repo.unfiltered().changelog |
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78 mfl = self._repo.manifestlog |
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79 |
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80 for rev in range(len(cl) - 1, 0, -1): |
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81 node = cl.node(rev) |
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82 data = cl.read(node) # get changeset data (we avoid object creation) |
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83 if path in data[3]: # checking the 'files' field. |
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84 # The file has been touched, check if the hash is what we're |
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85 # looking for. |
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86 if fileid == mfl[data[0]].readfast().get(path): |
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87 return rev |
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88 |
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89 # Couldn't find the linkrev. This should generally not happen, and will |
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90 # likely cause a crash. |
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91 return None |
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92 |
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93 def introrev(self): |
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94 """return the rev of the changeset which introduced this file revision |
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95 |
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96 This method is different from linkrev because it take into account the |
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97 changeset the filectx was created from. It ensures the returned |
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98 revision is one of its ancestors. This prevents bugs from |
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99 'linkrev-shadowing' when a file revision is used by multiple |
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100 changesets. |
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101 """ |
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102 lkr = self.linkrev() |
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103 attrs = vars(self) |
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104 noctx = not (r'_changeid' in attrs or r'_changectx' in attrs) |
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105 if noctx or self.rev() == lkr: |
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106 return lkr |
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107 linknode = self._adjustlinknode(self._path, self._filelog, |
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108 self._filenode, self.rev(), |
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109 inclusive=True) |
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110 return self._repo.changelog.rev(linknode) |
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111 |
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112 def renamed(self): |
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113 """check if file was actually renamed in this changeset revision |
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114 |
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115 If rename logged in file revision, we report copy for changeset only |
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116 if file revisions linkrev points back to the changeset in question |
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117 or both changeset parents contain different file revisions. |
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118 """ |
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119 ancestormap = self.ancestormap() |
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120 |
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121 p1, p2, linknode, copyfrom = ancestormap[self._filenode] |
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122 if not copyfrom: |
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123 return None |
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124 |
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125 renamed = (copyfrom, p1) |
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126 if self.rev() == self.linkrev(): |
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127 return renamed |
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128 |
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129 name = self.path() |
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130 fnode = self._filenode |
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131 for p in self._changectx.parents(): |
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132 try: |
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133 if fnode == p.filenode(name): |
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134 return None |
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135 except error.LookupError: |
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136 pass |
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137 return renamed |
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138 |
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139 def copysource(self): |
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140 copy = self.renamed() |
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141 return copy and copy[0] |
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142 |
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143 def ancestormap(self): |
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144 if not self._ancestormap: |
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145 self._ancestormap = self.filelog().ancestormap(self._filenode) |
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146 |
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147 return self._ancestormap |
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148 |
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149 def parents(self): |
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150 repo = self._repo |
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151 ancestormap = self.ancestormap() |
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152 |
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153 p1, p2, linknode, copyfrom = ancestormap[self._filenode] |
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154 results = [] |
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155 if p1 != nullid: |
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156 path = copyfrom or self._path |
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157 flog = repo.file(path) |
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158 p1ctx = remotefilectx(repo, path, fileid=p1, filelog=flog, |
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159 ancestormap=ancestormap) |
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160 p1ctx._descendantrev = self.rev() |
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161 results.append(p1ctx) |
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162 |
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163 if p2 != nullid: |
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164 path = self._path |
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165 flog = repo.file(path) |
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166 p2ctx = remotefilectx(repo, path, fileid=p2, filelog=flog, |
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167 ancestormap=ancestormap) |
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168 p2ctx._descendantrev = self.rev() |
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169 results.append(p2ctx) |
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170 |
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171 return results |
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172 |
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173 def _nodefromancrev(self, ancrev, cl, mfl, path, fnode): |
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174 """returns the node for <path> in <ancrev> if content matches <fnode>""" |
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175 ancctx = cl.read(ancrev) # This avoids object creation. |
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176 manifestnode, files = ancctx[0], ancctx[3] |
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177 # If the file was touched in this ancestor, and the content is similar |
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178 # to the one we are searching for. |
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179 if path in files and fnode == mfl[manifestnode].readfast().get(path): |
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180 return cl.node(ancrev) |
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181 return None |
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182 |
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183 def _adjustlinknode(self, path, filelog, fnode, srcrev, inclusive=False): |
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184 """return the first ancestor of <srcrev> introducing <fnode> |
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185 |
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186 If the linkrev of the file revision does not point to an ancestor of |
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187 srcrev, we'll walk down the ancestors until we find one introducing |
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188 this file revision. |
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189 |
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190 :repo: a localrepository object (used to access changelog and manifest) |
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191 :path: the file path |
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192 :fnode: the nodeid of the file revision |
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193 :filelog: the filelog of this path |
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194 :srcrev: the changeset revision we search ancestors from |
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195 :inclusive: if true, the src revision will also be checked |
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196 |
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197 Note: This is based on adjustlinkrev in core, but it's quite different. |
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198 |
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199 adjustlinkrev depends on the fact that the linkrev is the bottom most |
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200 node, and uses that as a stopping point for the ancestor traversal. We |
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201 can't do that here because the linknode is not guaranteed to be the |
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202 bottom most one. |
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203 |
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204 In our code here, we actually know what a bunch of potential ancestor |
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205 linknodes are, so instead of stopping the cheap-ancestor-traversal when |
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206 we get to a linkrev, we stop when we see any of the known linknodes. |
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207 """ |
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208 repo = self._repo |
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209 cl = repo.unfiltered().changelog |
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210 mfl = repo.manifestlog |
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211 ancestormap = self.ancestormap() |
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212 linknode = ancestormap[fnode][2] |
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213 |
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214 if srcrev is None: |
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215 # wctx case, used by workingfilectx during mergecopy |
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216 revs = [p.rev() for p in self._repo[None].parents()] |
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217 inclusive = True # we skipped the real (revless) source |
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218 else: |
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219 revs = [srcrev] |
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220 |
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221 if self._verifylinknode(revs, linknode): |
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222 return linknode |
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223 |
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224 commonlogkwargs = { |
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225 r'revs': ' '.join([hex(cl.node(rev)) for rev in revs]), |
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226 r'fnode': hex(fnode), |
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227 r'filepath': path, |
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228 r'user': shallowutil.getusername(repo.ui), |
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229 r'reponame': shallowutil.getreponame(repo.ui), |
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230 } |
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231 |
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232 repo.ui.log('linkrevfixup', 'adjusting linknode\n', **commonlogkwargs) |
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233 |
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234 pc = repo._phasecache |
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235 seenpublic = False |
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236 iteranc = cl.ancestors(revs, inclusive=inclusive) |
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237 for ancrev in iteranc: |
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238 # First, check locally-available history. |
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239 lnode = self._nodefromancrev(ancrev, cl, mfl, path, fnode) |
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240 if lnode is not None: |
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241 return lnode |
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242 |
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243 # adjusting linknode can be super-slow. To mitigate the issue |
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244 # we use two heuristics: calling fastlog and forcing remotefilelog |
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245 # prefetch |
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246 if not seenpublic and pc.phase(repo, ancrev) == phases.public: |
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247 # TODO: there used to be a codepath to fetch linknodes |
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248 # from a server as a fast path, but it appeared to |
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249 # depend on an API FB added to their phabricator. |
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250 lnode = self._forceprefetch(repo, path, fnode, revs, |
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251 commonlogkwargs) |
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252 if lnode: |
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253 return lnode |
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254 seenpublic = True |
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255 |
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256 return linknode |
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257 |
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258 def _forceprefetch(self, repo, path, fnode, revs, |
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259 commonlogkwargs): |
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260 # This next part is super non-obvious, so big comment block time! |
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261 # |
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262 # It is possible to get extremely bad performance here when a fairly |
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263 # common set of circumstances occur when this extension is combined |
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264 # with a server-side commit rewriting extension like pushrebase. |
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265 # |
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266 # First, an engineer creates Commit A and pushes it to the server. |
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267 # While the server's data structure will have the correct linkrev |
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268 # for the files touched in Commit A, the client will have the |
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269 # linkrev of the local commit, which is "invalid" because it's not |
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270 # an ancestor of the main line of development. |
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271 # |
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272 # The client will never download the remotefilelog with the correct |
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273 # linkrev as long as nobody else touches that file, since the file |
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274 # data and history hasn't changed since Commit A. |
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275 # |
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276 # After a long time (or a short time in a heavily used repo), if the |
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277 # same engineer returns to change the same file, some commands -- |
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278 # such as amends of commits with file moves, logs, diffs, etc -- |
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279 # can trigger this _adjustlinknode code. In those cases, finding |
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280 # the correct rev can become quite expensive, as the correct |
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281 # revision is far back in history and we need to walk back through |
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282 # history to find it. |
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283 # |
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284 # In order to improve this situation, we force a prefetch of the |
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285 # remotefilelog data blob for the file we were called on. We do this |
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286 # at most once, when we first see a public commit in the history we |
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287 # are traversing. |
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288 # |
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289 # Forcing the prefetch means we will download the remote blob even |
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290 # if we have the "correct" blob in the local store. Since the union |
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291 # store checks the remote store first, this means we are much more |
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292 # likely to get the correct linkrev at this point. |
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293 # |
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294 # In rare circumstances (such as the server having a suboptimal |
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295 # linkrev for our use case), we will fall back to the old slow path. |
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296 # |
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297 # We may want to add additional heuristics here in the future if |
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298 # the slow path is used too much. One promising possibility is using |
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299 # obsolescence markers to find a more-likely-correct linkrev. |
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300 |
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301 logmsg = '' |
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302 start = time.time() |
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303 try: |
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304 repo.fileservice.prefetch([(path, hex(fnode))], force=True) |
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305 |
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306 # Now that we've downloaded a new blob from the server, |
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307 # we need to rebuild the ancestor map to recompute the |
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308 # linknodes. |
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309 self._ancestormap = None |
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310 linknode = self.ancestormap()[fnode][2] # 2 is linknode |
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311 if self._verifylinknode(revs, linknode): |
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312 logmsg = 'remotefilelog prefetching succeeded' |
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313 return linknode |
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314 logmsg = 'remotefilelog prefetching not found' |
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315 return None |
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316 except Exception as e: |
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317 logmsg = 'remotefilelog prefetching failed (%s)' % e |
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318 return None |
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319 finally: |
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320 elapsed = time.time() - start |
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321 repo.ui.log('linkrevfixup', logmsg + '\n', elapsed=elapsed * 1000, |
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322 **commonlogkwargs) |
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323 |
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324 def _verifylinknode(self, revs, linknode): |
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325 """ |
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326 Check if a linknode is correct one for the current history. |
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327 |
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328 That is, return True if the linkrev is the ancestor of any of the |
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329 passed in revs, otherwise return False. |
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330 |
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331 `revs` is a list that usually has one element -- usually the wdir parent |
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332 or the user-passed rev we're looking back from. It may contain two revs |
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333 when there is a merge going on, or zero revs when a root node with no |
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334 parents is being created. |
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335 """ |
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336 if not revs: |
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337 return False |
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338 try: |
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339 # Use the C fastpath to check if the given linknode is correct. |
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340 cl = self._repo.unfiltered().changelog |
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341 return any(cl.isancestor(linknode, cl.node(r)) for r in revs) |
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342 except error.LookupError: |
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343 # The linknode read from the blob may have been stripped or |
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344 # otherwise not present in the repository anymore. Do not fail hard |
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345 # in this case. Instead, return false and continue the search for |
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346 # the correct linknode. |
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347 return False |
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348 |
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349 def ancestors(self, followfirst=False): |
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350 ancestors = [] |
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351 queue = collections.deque((self,)) |
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352 seen = set() |
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353 while queue: |
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354 current = queue.pop() |
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355 if current.filenode() in seen: |
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356 continue |
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357 seen.add(current.filenode()) |
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358 |
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359 ancestors.append(current) |
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360 |
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361 parents = current.parents() |
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362 first = True |
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363 for p in parents: |
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364 if first or not followfirst: |
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365 queue.append(p) |
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366 first = False |
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367 |
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368 # Remove self |
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369 ancestors.pop(0) |
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370 |
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371 # Sort by linkrev |
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372 # The copy tracing algorithm depends on these coming out in order |
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373 ancestors = sorted(ancestors, reverse=True, key=lambda x:x.linkrev()) |
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374 |
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375 for ancestor in ancestors: |
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376 yield ancestor |
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377 |
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378 def ancestor(self, fc2, actx): |
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379 # the easy case: no (relevant) renames |
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380 if fc2.path() == self.path() and self.path() in actx: |
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381 return actx[self.path()] |
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382 |
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383 # the next easiest cases: unambiguous predecessor (name trumps |
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384 # history) |
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385 if self.path() in actx and fc2.path() not in actx: |
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386 return actx[self.path()] |
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387 if fc2.path() in actx and self.path() not in actx: |
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388 return actx[fc2.path()] |
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389 |
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390 # do a full traversal |
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391 amap = self.ancestormap() |
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392 bmap = fc2.ancestormap() |
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393 |
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394 def parents(x): |
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395 f, n = x |
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396 p = amap.get(n) or bmap.get(n) |
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397 if not p: |
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398 return [] |
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399 |
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400 return [(p[3] or f, p[0]), (f, p[1])] |
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401 |
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402 a = (self.path(), self.filenode()) |
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403 b = (fc2.path(), fc2.filenode()) |
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404 result = ancestor.genericancestor(a, b, parents) |
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405 if result: |
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406 f, n = result |
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407 r = remotefilectx(self._repo, f, fileid=n, |
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408 ancestormap=amap) |
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409 return r |
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410 |
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411 return None |
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412 |
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413 def annotate(self, *args, **kwargs): |
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414 introctx = self |
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415 prefetchskip = kwargs.pop(r'prefetchskip', None) |
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416 if prefetchskip: |
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417 # use introrev so prefetchskip can be accurately tested |
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418 introrev = self.introrev() |
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419 if self.rev() != introrev: |
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420 introctx = remotefilectx(self._repo, self._path, |
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421 changeid=introrev, |
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422 fileid=self._filenode, |
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423 filelog=self._filelog, |
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424 ancestormap=self._ancestormap) |
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425 |
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426 # like self.ancestors, but append to "fetch" and skip visiting parents |
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427 # of nodes in "prefetchskip". |
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428 fetch = [] |
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429 seen = set() |
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430 queue = collections.deque((introctx,)) |
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431 seen.add(introctx.node()) |
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432 while queue: |
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433 current = queue.pop() |
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434 if current.filenode() != self.filenode(): |
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435 # this is a "joint point". fastannotate needs contents of |
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436 # "joint point"s to calculate diffs for side branches. |
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437 fetch.append((current.path(), hex(current.filenode()))) |
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438 if prefetchskip and current in prefetchskip: |
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439 continue |
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440 for parent in current.parents(): |
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441 if parent.node() not in seen: |
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442 seen.add(parent.node()) |
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443 queue.append(parent) |
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444 |
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445 self._repo.ui.debug('remotefilelog: prefetching %d files ' |
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446 'for annotate\n' % len(fetch)) |
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447 if fetch: |
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448 self._repo.fileservice.prefetch(fetch) |
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449 return super(remotefilectx, self).annotate(*args, **kwargs) |
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450 |
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451 # Return empty set so that the hg serve and thg don't stack trace |
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452 def children(self): |
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453 return [] |
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454 |
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455 class remoteworkingfilectx(context.workingfilectx, remotefilectx): |
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456 def __init__(self, repo, path, filelog=None, workingctx=None): |
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457 self._ancestormap = None |
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458 super(remoteworkingfilectx, self).__init__(repo, path, filelog, |
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459 workingctx) |
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460 |
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461 def parents(self): |
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462 return remotefilectx.parents(self) |
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463 |
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464 def ancestormap(self): |
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465 if not self._ancestormap: |
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466 path = self._path |
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467 pcl = self._changectx._parents |
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468 renamed = self.renamed() |
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469 |
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470 if renamed: |
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471 p1 = renamed |
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472 else: |
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473 p1 = (path, pcl[0]._manifest.get(path, nullid)) |
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474 |
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475 p2 = (path, nullid) |
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476 if len(pcl) > 1: |
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477 p2 = (path, pcl[1]._manifest.get(path, nullid)) |
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478 |
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479 m = {} |
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480 if p1[1] != nullid: |
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481 p1ctx = self._repo.filectx(p1[0], fileid=p1[1]) |
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482 m.update(p1ctx.filelog().ancestormap(p1[1])) |
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483 |
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484 if p2[1] != nullid: |
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485 p2ctx = self._repo.filectx(p2[0], fileid=p2[1]) |
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486 m.update(p2ctx.filelog().ancestormap(p2[1])) |
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487 |
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488 copyfrom = '' |
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489 if renamed: |
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490 copyfrom = renamed[0] |
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491 m[None] = (p1[1], p2[1], nullid, copyfrom) |
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492 self._ancestormap = m |
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493 |
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494 return self._ancestormap |