Mercurial > hg
annotate hgext/remotefilelog/remotefilectx.py @ 43076:2372284d9457
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This is using my patch to black
(https://github.com/psf/black/pull/826) so we don't un-wrap collection
literals.
Done with:
hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S
# skip-blame mass-reformatting only
# no-check-commit reformats foo_bar functions
Differential Revision: https://phab.mercurial-scm.org/D6971
author | Augie Fackler <augie@google.com> |
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date | Sun, 06 Oct 2019 09:45:02 -0400 |
parents | 041d829575ed |
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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 |
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26 class remotefilectx(context.filectx): |
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27 def __init__( |
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28 self, |
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29 repo, |
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30 path, |
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31 changeid=None, |
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32 fileid=None, |
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33 filelog=None, |
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34 changectx=None, |
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35 ancestormap=None, |
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36 ): |
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37 if fileid == nullrev: |
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38 fileid = nullid |
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39 if fileid and len(fileid) == 40: |
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40 fileid = bin(fileid) |
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41 super(remotefilectx, self).__init__( |
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42 repo, path, changeid, fileid, filelog, changectx |
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43 ) |
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44 self._ancestormap = ancestormap |
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45 |
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46 def size(self): |
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47 return self._filelog.size(self._filenode) |
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48 |
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49 @propertycache |
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50 def _changeid(self): |
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51 if r'_changeid' in self.__dict__: |
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52 return self._changeid |
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53 elif r'_changectx' in self.__dict__: |
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54 return self._changectx.rev() |
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55 elif r'_descendantrev' in self.__dict__: |
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56 # this file context was created from a revision with a known |
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57 # descendant, we can (lazily) correct for linkrev aliases |
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58 linknode = self._adjustlinknode( |
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59 self._path, self._filelog, self._filenode, self._descendantrev |
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60 ) |
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61 return self._repo.unfiltered().changelog.rev(linknode) |
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62 else: |
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63 return self.linkrev() |
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64 |
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65 def filectx(self, fileid, changeid=None): |
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66 '''opens an arbitrary revision of the file without |
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67 opening a new filelog''' |
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68 return remotefilectx( |
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69 self._repo, |
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70 self._path, |
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71 fileid=fileid, |
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72 filelog=self._filelog, |
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73 changeid=changeid, |
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74 ) |
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75 |
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76 def linkrev(self): |
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77 return self._linkrev |
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78 |
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79 @propertycache |
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80 def _linkrev(self): |
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81 if self._filenode == nullid: |
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82 return nullrev |
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83 |
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84 ancestormap = self.ancestormap() |
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85 p1, p2, linknode, copyfrom = ancestormap[self._filenode] |
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86 rev = self._repo.changelog.nodemap.get(linknode) |
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87 if rev is not None: |
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88 return rev |
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89 |
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90 # Search all commits for the appropriate linkrev (slow, but uncommon) |
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91 path = self._path |
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92 fileid = self._filenode |
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93 cl = self._repo.unfiltered().changelog |
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94 mfl = self._repo.manifestlog |
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95 |
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96 for rev in range(len(cl) - 1, 0, -1): |
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97 node = cl.node(rev) |
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98 data = cl.read( |
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99 node |
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100 ) # get changeset data (we avoid object creation) |
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101 if path in data[3]: # checking the 'files' field. |
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102 # The file has been touched, check if the hash is what we're |
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103 # looking for. |
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104 if fileid == mfl[data[0]].readfast().get(path): |
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105 return rev |
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106 |
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107 # Couldn't find the linkrev. This should generally not happen, and will |
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108 # likely cause a crash. |
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109 return None |
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110 |
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111 def introrev(self): |
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112 """return the rev of the changeset which introduced this file revision |
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113 |
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114 This method is different from linkrev because it take into account the |
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115 changeset the filectx was created from. It ensures the returned |
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116 revision is one of its ancestors. This prevents bugs from |
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117 'linkrev-shadowing' when a file revision is used by multiple |
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118 changesets. |
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119 """ |
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120 lkr = self.linkrev() |
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121 attrs = vars(self) |
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122 noctx = not (r'_changeid' in attrs or r'_changectx' in attrs) |
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123 if noctx or self.rev() == lkr: |
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124 return lkr |
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125 linknode = self._adjustlinknode( |
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126 self._path, |
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127 self._filelog, |
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128 self._filenode, |
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129 self.rev(), |
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130 inclusive=True, |
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131 ) |
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132 return self._repo.changelog.rev(linknode) |
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133 |
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134 def renamed(self): |
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135 """check if file was actually renamed in this changeset revision |
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136 |
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137 If rename logged in file revision, we report copy for changeset only |
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138 if file revisions linkrev points back to the changeset in question |
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139 or both changeset parents contain different file revisions. |
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140 """ |
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141 ancestormap = self.ancestormap() |
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142 |
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143 p1, p2, linknode, copyfrom = ancestormap[self._filenode] |
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144 if not copyfrom: |
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145 return None |
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146 |
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147 renamed = (copyfrom, p1) |
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148 if self.rev() == self.linkrev(): |
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149 return renamed |
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150 |
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151 name = self.path() |
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152 fnode = self._filenode |
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153 for p in self._changectx.parents(): |
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154 try: |
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155 if fnode == p.filenode(name): |
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156 return None |
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157 except error.LookupError: |
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158 pass |
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159 return renamed |
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160 |
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161 def copysource(self): |
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162 copy = self.renamed() |
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163 return copy and copy[0] |
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164 |
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165 def ancestormap(self): |
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166 if not self._ancestormap: |
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167 self._ancestormap = self.filelog().ancestormap(self._filenode) |
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168 |
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169 return self._ancestormap |
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170 |
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171 def parents(self): |
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172 repo = self._repo |
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173 ancestormap = self.ancestormap() |
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174 |
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175 p1, p2, linknode, copyfrom = ancestormap[self._filenode] |
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176 results = [] |
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177 if p1 != nullid: |
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178 path = copyfrom or self._path |
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179 flog = repo.file(path) |
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180 p1ctx = remotefilectx( |
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181 repo, path, fileid=p1, filelog=flog, ancestormap=ancestormap |
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182 ) |
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183 p1ctx._descendantrev = self.rev() |
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184 results.append(p1ctx) |
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185 |
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186 if p2 != nullid: |
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187 path = self._path |
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188 flog = repo.file(path) |
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189 p2ctx = remotefilectx( |
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190 repo, path, fileid=p2, filelog=flog, ancestormap=ancestormap |
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191 ) |
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192 p2ctx._descendantrev = self.rev() |
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193 results.append(p2ctx) |
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194 |
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195 return results |
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196 |
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197 def _nodefromancrev(self, ancrev, cl, mfl, path, fnode): |
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198 """returns the node for <path> in <ancrev> if content matches <fnode>""" |
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199 ancctx = cl.read(ancrev) # This avoids object creation. |
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200 manifestnode, files = ancctx[0], ancctx[3] |
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201 # If the file was touched in this ancestor, and the content is similar |
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202 # to the one we are searching for. |
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203 if path in files and fnode == mfl[manifestnode].readfast().get(path): |
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204 return cl.node(ancrev) |
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205 return None |
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206 |
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207 def _adjustlinknode(self, path, filelog, fnode, srcrev, inclusive=False): |
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208 """return the first ancestor of <srcrev> introducing <fnode> |
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209 |
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210 If the linkrev of the file revision does not point to an ancestor of |
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211 srcrev, we'll walk down the ancestors until we find one introducing |
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212 this file revision. |
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213 |
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214 :repo: a localrepository object (used to access changelog and manifest) |
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215 :path: the file path |
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216 :fnode: the nodeid of the file revision |
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217 :filelog: the filelog of this path |
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218 :srcrev: the changeset revision we search ancestors from |
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219 :inclusive: if true, the src revision will also be checked |
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220 |
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221 Note: This is based on adjustlinkrev in core, but it's quite different. |
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222 |
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223 adjustlinkrev depends on the fact that the linkrev is the bottom most |
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224 node, and uses that as a stopping point for the ancestor traversal. We |
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225 can't do that here because the linknode is not guaranteed to be the |
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226 bottom most one. |
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227 |
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228 In our code here, we actually know what a bunch of potential ancestor |
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229 linknodes are, so instead of stopping the cheap-ancestor-traversal when |
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230 we get to a linkrev, we stop when we see any of the known linknodes. |
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231 """ |
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232 repo = self._repo |
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233 cl = repo.unfiltered().changelog |
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234 mfl = repo.manifestlog |
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235 ancestormap = self.ancestormap() |
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236 linknode = ancestormap[fnode][2] |
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237 |
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238 if srcrev is None: |
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239 # wctx case, used by workingfilectx during mergecopy |
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240 revs = [p.rev() for p in self._repo[None].parents()] |
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241 inclusive = True # we skipped the real (revless) source |
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242 else: |
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243 revs = [srcrev] |
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244 |
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245 if self._verifylinknode(revs, linknode): |
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246 return linknode |
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247 |
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248 commonlogkwargs = { |
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249 r'revs': ' '.join([hex(cl.node(rev)) for rev in revs]), |
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250 r'fnode': hex(fnode), |
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251 r'filepath': path, |
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252 r'user': shallowutil.getusername(repo.ui), |
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253 r'reponame': shallowutil.getreponame(repo.ui), |
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254 } |
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255 |
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256 repo.ui.log('linkrevfixup', 'adjusting linknode\n', **commonlogkwargs) |
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257 |
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258 pc = repo._phasecache |
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259 seenpublic = False |
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260 iteranc = cl.ancestors(revs, inclusive=inclusive) |
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261 for ancrev in iteranc: |
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262 # First, check locally-available history. |
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263 lnode = self._nodefromancrev(ancrev, cl, mfl, path, fnode) |
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264 if lnode is not None: |
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265 return lnode |
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266 |
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267 # adjusting linknode can be super-slow. To mitigate the issue |
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268 # we use two heuristics: calling fastlog and forcing remotefilelog |
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269 # prefetch |
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270 if not seenpublic and pc.phase(repo, ancrev) == phases.public: |
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271 # TODO: there used to be a codepath to fetch linknodes |
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272 # from a server as a fast path, but it appeared to |
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273 # depend on an API FB added to their phabricator. |
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274 lnode = self._forceprefetch( |
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275 repo, path, fnode, revs, commonlogkwargs |
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276 ) |
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277 if lnode: |
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278 return lnode |
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279 seenpublic = True |
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280 |
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281 return linknode |
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282 |
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283 def _forceprefetch(self, repo, path, fnode, revs, commonlogkwargs): |
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284 # This next part is super non-obvious, so big comment block time! |
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285 # |
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286 # It is possible to get extremely bad performance here when a fairly |
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287 # common set of circumstances occur when this extension is combined |
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288 # with a server-side commit rewriting extension like pushrebase. |
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289 # |
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290 # First, an engineer creates Commit A and pushes it to the server. |
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291 # While the server's data structure will have the correct linkrev |
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292 # for the files touched in Commit A, the client will have the |
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293 # linkrev of the local commit, which is "invalid" because it's not |
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294 # an ancestor of the main line of development. |
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295 # |
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296 # The client will never download the remotefilelog with the correct |
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297 # linkrev as long as nobody else touches that file, since the file |
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298 # data and history hasn't changed since Commit A. |
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299 # |
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300 # After a long time (or a short time in a heavily used repo), if the |
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301 # same engineer returns to change the same file, some commands -- |
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302 # such as amends of commits with file moves, logs, diffs, etc -- |
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303 # can trigger this _adjustlinknode code. In those cases, finding |
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304 # the correct rev can become quite expensive, as the correct |
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305 # revision is far back in history and we need to walk back through |
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306 # history to find it. |
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307 # |
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308 # In order to improve this situation, we force a prefetch of the |
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309 # remotefilelog data blob for the file we were called on. We do this |
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310 # at most once, when we first see a public commit in the history we |
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311 # are traversing. |
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312 # |
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313 # Forcing the prefetch means we will download the remote blob even |
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314 # if we have the "correct" blob in the local store. Since the union |
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315 # store checks the remote store first, this means we are much more |
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316 # likely to get the correct linkrev at this point. |
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317 # |
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318 # In rare circumstances (such as the server having a suboptimal |
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319 # linkrev for our use case), we will fall back to the old slow path. |
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320 # |
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321 # We may want to add additional heuristics here in the future if |
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322 # the slow path is used too much. One promising possibility is using |
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323 # obsolescence markers to find a more-likely-correct linkrev. |
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324 |
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325 logmsg = '' |
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326 start = time.time() |
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327 try: |
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328 repo.fileservice.prefetch([(path, hex(fnode))], force=True) |
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329 |
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330 # Now that we've downloaded a new blob from the server, |
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331 # we need to rebuild the ancestor map to recompute the |
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332 # linknodes. |
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333 self._ancestormap = None |
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334 linknode = self.ancestormap()[fnode][2] # 2 is linknode |
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335 if self._verifylinknode(revs, linknode): |
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336 logmsg = 'remotefilelog prefetching succeeded' |
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337 return linknode |
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338 logmsg = 'remotefilelog prefetching not found' |
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339 return None |
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340 except Exception as e: |
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341 logmsg = 'remotefilelog prefetching failed (%s)' % e |
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342 return None |
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343 finally: |
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344 elapsed = time.time() - start |
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345 repo.ui.log( |
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346 'linkrevfixup', |
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347 logmsg + '\n', |
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348 elapsed=elapsed * 1000, |
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349 **commonlogkwargs |
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350 ) |
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351 |
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352 def _verifylinknode(self, revs, linknode): |
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353 """ |
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354 Check if a linknode is correct one for the current history. |
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355 |
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356 That is, return True if the linkrev is the ancestor of any of the |
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357 passed in revs, otherwise return False. |
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358 |
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359 `revs` is a list that usually has one element -- usually the wdir parent |
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360 or the user-passed rev we're looking back from. It may contain two revs |
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361 when there is a merge going on, or zero revs when a root node with no |
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362 parents is being created. |
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363 """ |
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364 if not revs: |
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365 return False |
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366 try: |
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367 # Use the C fastpath to check if the given linknode is correct. |
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368 cl = self._repo.unfiltered().changelog |
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369 return any(cl.isancestor(linknode, cl.node(r)) for r in revs) |
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370 except error.LookupError: |
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371 # The linknode read from the blob may have been stripped or |
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372 # otherwise not present in the repository anymore. Do not fail hard |
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373 # in this case. Instead, return false and continue the search for |
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374 # the correct linknode. |
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375 return False |
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376 |
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377 def ancestors(self, followfirst=False): |
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378 ancestors = [] |
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379 queue = collections.deque((self,)) |
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380 seen = set() |
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381 while queue: |
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382 current = queue.pop() |
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383 if current.filenode() in seen: |
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384 continue |
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385 seen.add(current.filenode()) |
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386 |
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387 ancestors.append(current) |
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388 |
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389 parents = current.parents() |
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390 first = True |
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391 for p in parents: |
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392 if first or not followfirst: |
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393 queue.append(p) |
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394 first = False |
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395 |
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396 # Remove self |
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397 ancestors.pop(0) |
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398 |
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399 # Sort by linkrev |
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400 # The copy tracing algorithm depends on these coming out in order |
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401 ancestors = sorted(ancestors, reverse=True, key=lambda x: x.linkrev()) |
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402 |
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403 for ancestor in ancestors: |
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404 yield ancestor |
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405 |
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406 def ancestor(self, fc2, actx): |
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407 # the easy case: no (relevant) renames |
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408 if fc2.path() == self.path() and self.path() in actx: |
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409 return actx[self.path()] |
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410 |
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411 # the next easiest cases: unambiguous predecessor (name trumps |
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412 # history) |
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413 if self.path() in actx and fc2.path() not in actx: |
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414 return actx[self.path()] |
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415 if fc2.path() in actx and self.path() not in actx: |
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416 return actx[fc2.path()] |
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417 |
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418 # do a full traversal |
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419 amap = self.ancestormap() |
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420 bmap = fc2.ancestormap() |
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421 |
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422 def parents(x): |
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423 f, n = x |
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424 p = amap.get(n) or bmap.get(n) |
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425 if not p: |
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426 return [] |
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427 |
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428 return [(p[3] or f, p[0]), (f, p[1])] |
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429 |
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430 a = (self.path(), self.filenode()) |
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431 b = (fc2.path(), fc2.filenode()) |
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432 result = ancestor.genericancestor(a, b, parents) |
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433 if result: |
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434 f, n = result |
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435 r = remotefilectx(self._repo, f, fileid=n, ancestormap=amap) |
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436 return r |
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437 |
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438 return None |
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439 |
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440 def annotate(self, *args, **kwargs): |
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441 introctx = self |
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442 prefetchskip = kwargs.pop(r'prefetchskip', None) |
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443 if prefetchskip: |
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444 # use introrev so prefetchskip can be accurately tested |
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445 introrev = self.introrev() |
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446 if self.rev() != introrev: |
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447 introctx = remotefilectx( |
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448 self._repo, |
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449 self._path, |
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450 changeid=introrev, |
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451 fileid=self._filenode, |
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452 filelog=self._filelog, |
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453 ancestormap=self._ancestormap, |
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454 ) |
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455 |
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456 # like self.ancestors, but append to "fetch" and skip visiting parents |
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457 # of nodes in "prefetchskip". |
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458 fetch = [] |
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459 seen = set() |
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460 queue = collections.deque((introctx,)) |
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461 seen.add(introctx.node()) |
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462 while queue: |
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463 current = queue.pop() |
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464 if current.filenode() != self.filenode(): |
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465 # this is a "joint point". fastannotate needs contents of |
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466 # "joint point"s to calculate diffs for side branches. |
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467 fetch.append((current.path(), hex(current.filenode()))) |
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468 if prefetchskip and current in prefetchskip: |
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469 continue |
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470 for parent in current.parents(): |
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471 if parent.node() not in seen: |
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472 seen.add(parent.node()) |
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473 queue.append(parent) |
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474 |
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475 self._repo.ui.debug( |
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476 'remotefilelog: prefetching %d files ' 'for annotate\n' % len(fetch) |
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477 ) |
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478 if fetch: |
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479 self._repo.fileservice.prefetch(fetch) |
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480 return super(remotefilectx, self).annotate(*args, **kwargs) |
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481 |
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482 # Return empty set so that the hg serve and thg don't stack trace |
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483 def children(self): |
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484 return [] |
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485 |
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486 |
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487 class remoteworkingfilectx(context.workingfilectx, remotefilectx): |
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488 def __init__(self, repo, path, filelog=None, workingctx=None): |
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489 self._ancestormap = None |
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490 super(remoteworkingfilectx, self).__init__( |
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491 repo, path, filelog, workingctx |
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492 ) |
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493 |
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494 def parents(self): |
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495 return remotefilectx.parents(self) |
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496 |
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497 def ancestormap(self): |
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498 if not self._ancestormap: |
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499 path = self._path |
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500 pcl = self._changectx._parents |
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501 renamed = self.renamed() |
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502 |
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503 if renamed: |
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504 p1 = renamed |
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505 else: |
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506 p1 = (path, pcl[0]._manifest.get(path, nullid)) |
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507 |
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508 p2 = (path, nullid) |
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509 if len(pcl) > 1: |
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510 p2 = (path, pcl[1]._manifest.get(path, nullid)) |
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511 |
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512 m = {} |
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513 if p1[1] != nullid: |
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514 p1ctx = self._repo.filectx(p1[0], fileid=p1[1]) |
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515 m.update(p1ctx.filelog().ancestormap(p1[1])) |
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516 |
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517 if p2[1] != nullid: |
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518 p2ctx = self._repo.filectx(p2[0], fileid=p2[1]) |
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519 m.update(p2ctx.filelog().ancestormap(p2[1])) |
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520 |
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521 copyfrom = '' |
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522 if renamed: |
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523 copyfrom = renamed[0] |
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524 m[None] = (p1[1], p2[1], nullid, copyfrom) |
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525 self._ancestormap = m |
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526 |
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527 return self._ancestormap |