Mercurial > hg
annotate hgext/remotefilelog/remotefilelog.py @ 41251:beb0d944a99b
remotefilelog: implement __bool__ as well as __nonzero__ for py3
Differential Revision: https://phab.mercurial-scm.org/D5601
author | Augie Fackler <augie@google.com> |
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date | Wed, 16 Jan 2019 10:58:09 -0500 |
parents | 9769e0f6ffe0 |
children | 876494fd967d |
rev | line source |
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1 # remotefilelog.py - filelog implementation where filelog history is stored |
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2 # remotely |
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3 # |
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4 # Copyright 2013 Facebook, Inc. |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import os |
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12 |
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13 from mercurial.node import bin, nullid |
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14 from mercurial.i18n import _ |
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15 from mercurial import ( |
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16 ancestor, |
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17 error, |
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18 mdiff, |
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19 revlog, |
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20 ) |
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21 from mercurial.utils import storageutil |
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22 |
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23 from . import ( |
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24 constants, |
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25 fileserverclient, |
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26 shallowutil, |
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27 ) |
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28 |
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29 class remotefilelognodemap(object): |
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30 def __init__(self, filename, store): |
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31 self._filename = filename |
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32 self._store = store |
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33 |
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34 def __contains__(self, node): |
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35 missing = self._store.getmissing([(self._filename, node)]) |
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36 return not bool(missing) |
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37 |
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38 def __get__(self, node): |
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39 if node not in self: |
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40 raise KeyError(node) |
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41 return node |
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42 |
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43 class remotefilelog(object): |
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44 |
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45 _generaldelta = True |
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46 |
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47 def __init__(self, opener, path, repo): |
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48 self.opener = opener |
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49 self.filename = path |
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50 self.repo = repo |
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51 self.nodemap = remotefilelognodemap(self.filename, repo.contentstore) |
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52 |
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53 self.version = 1 |
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54 |
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55 def read(self, node): |
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56 """returns the file contents at this node""" |
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57 t = self.revision(node) |
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58 if not t.startswith('\1\n'): |
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59 return t |
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60 s = t.index('\1\n', 2) |
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61 return t[s + 2:] |
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62 |
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63 def add(self, text, meta, transaction, linknode, p1=None, p2=None): |
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64 hashtext = text |
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65 |
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66 # hash with the metadata, like in vanilla filelogs |
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67 hashtext = shallowutil.createrevlogtext(text, meta.get('copy'), |
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68 meta.get('copyrev')) |
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69 node = storageutil.hashrevisionsha1(hashtext, p1, p2) |
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70 return self.addrevision(hashtext, transaction, linknode, p1, p2, |
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71 node=node) |
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72 |
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73 def _createfileblob(self, text, meta, flags, p1, p2, node, linknode): |
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74 # text passed to "_createfileblob" does not include filelog metadata |
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75 header = shallowutil.buildfileblobheader(len(text), flags) |
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76 data = "%s\0%s" % (header, text) |
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77 |
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78 realp1 = p1 |
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79 copyfrom = "" |
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80 if meta and 'copy' in meta: |
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81 copyfrom = meta['copy'] |
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82 realp1 = bin(meta['copyrev']) |
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83 |
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84 data += "%s%s%s%s%s\0" % (node, realp1, p2, linknode, copyfrom) |
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85 |
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86 visited = set() |
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87 |
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88 pancestors = {} |
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89 queue = [] |
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90 if realp1 != nullid: |
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91 p1flog = self |
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92 if copyfrom: |
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93 p1flog = remotefilelog(self.opener, copyfrom, self.repo) |
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94 |
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95 pancestors.update(p1flog.ancestormap(realp1)) |
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96 queue.append(realp1) |
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97 visited.add(realp1) |
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98 if p2 != nullid: |
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99 pancestors.update(self.ancestormap(p2)) |
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100 queue.append(p2) |
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101 visited.add(p2) |
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102 |
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103 ancestortext = "" |
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104 |
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105 # add the ancestors in topological order |
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106 while queue: |
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107 c = queue.pop(0) |
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108 pa1, pa2, ancestorlinknode, pacopyfrom = pancestors[c] |
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109 |
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110 pacopyfrom = pacopyfrom or '' |
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111 ancestortext += "%s%s%s%s%s\0" % ( |
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112 c, pa1, pa2, ancestorlinknode, pacopyfrom) |
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113 |
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114 if pa1 != nullid and pa1 not in visited: |
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115 queue.append(pa1) |
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116 visited.add(pa1) |
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117 if pa2 != nullid and pa2 not in visited: |
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118 queue.append(pa2) |
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119 visited.add(pa2) |
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120 |
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121 data += ancestortext |
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122 |
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123 return data |
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124 |
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125 def addrevision(self, text, transaction, linknode, p1, p2, cachedelta=None, |
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126 node=None, flags=revlog.REVIDX_DEFAULT_FLAGS): |
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127 # text passed to "addrevision" includes hg filelog metadata header |
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128 if node is None: |
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129 node = storageutil.hashrevisionsha1(text, p1, p2) |
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130 |
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131 meta, metaoffset = storageutil.parsemeta(text) |
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132 rawtext, validatehash = self._processflags(text, flags, 'write') |
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133 return self.addrawrevision(rawtext, transaction, linknode, p1, p2, |
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134 node, flags, cachedelta, |
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135 _metatuple=(meta, metaoffset)) |
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136 |
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137 def addrawrevision(self, rawtext, transaction, linknode, p1, p2, node, |
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138 flags, cachedelta=None, _metatuple=None): |
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139 if _metatuple: |
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140 # _metatuple: used by "addrevision" internally by remotefilelog |
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141 # meta was parsed confidently |
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142 meta, metaoffset = _metatuple |
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143 else: |
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144 # not from self.addrevision, but something else (repo._filecommit) |
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145 # calls addrawrevision directly. remotefilelog needs to get and |
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146 # strip filelog metadata. |
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147 # we don't have confidence about whether rawtext contains filelog |
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148 # metadata or not (flag processor could replace it), so we just |
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149 # parse it as best-effort. |
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150 # in LFS (flags != 0)'s case, the best way is to call LFS code to |
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151 # get the meta information, instead of storageutil.parsemeta. |
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152 meta, metaoffset = storageutil.parsemeta(rawtext) |
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153 if flags != 0: |
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154 # when flags != 0, be conservative and do not mangle rawtext, since |
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155 # a read flag processor expects the text not being mangled at all. |
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156 metaoffset = 0 |
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157 if metaoffset: |
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158 # remotefilelog fileblob stores copy metadata in its ancestortext, |
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159 # not its main blob. so we need to remove filelog metadata |
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160 # (containing copy information) from text. |
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161 blobtext = rawtext[metaoffset:] |
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162 else: |
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163 blobtext = rawtext |
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164 data = self._createfileblob(blobtext, meta, flags, p1, p2, node, |
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165 linknode) |
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166 self.repo.contentstore.addremotefilelognode(self.filename, node, data) |
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167 |
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168 return node |
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169 |
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170 def renamed(self, node): |
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171 ancestors = self.repo.metadatastore.getancestors(self.filename, node) |
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172 p1, p2, linknode, copyfrom = ancestors[node] |
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173 if copyfrom: |
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174 return (copyfrom, p1) |
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175 |
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176 return False |
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177 |
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178 def size(self, node): |
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179 """return the size of a given revision""" |
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180 return len(self.read(node)) |
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181 |
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182 rawsize = size |
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183 |
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184 def cmp(self, node, text): |
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185 """compare text with a given file revision |
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186 |
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187 returns True if text is different than what is stored. |
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188 """ |
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189 |
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190 if node == nullid: |
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191 return True |
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192 |
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193 nodetext = self.read(node) |
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194 return nodetext != text |
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195 |
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196 def __nonzero__(self): |
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197 return True |
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198 |
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199 __bool__ = __nonzero__ |
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200 |
40495
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201 def __len__(self): |
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202 if self.filename == '.hgtags': |
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203 # The length of .hgtags is used to fast path tag checking. |
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204 # remotefilelog doesn't support .hgtags since the entire .hgtags |
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205 # history is needed. Use the excludepattern setting to make |
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206 # .hgtags a normal filelog. |
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207 return 0 |
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208 |
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209 raise RuntimeError("len not supported") |
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210 |
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211 def empty(self): |
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212 return False |
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213 |
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214 def flags(self, node): |
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215 if isinstance(node, int): |
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216 raise error.ProgrammingError( |
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217 'remotefilelog does not accept integer rev for flags') |
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218 store = self.repo.contentstore |
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219 return store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0) |
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220 |
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221 def parents(self, node): |
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222 if node == nullid: |
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223 return nullid, nullid |
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224 |
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225 ancestormap = self.repo.metadatastore.getancestors(self.filename, node) |
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226 p1, p2, linknode, copyfrom = ancestormap[node] |
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227 if copyfrom: |
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228 p1 = nullid |
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229 |
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230 return p1, p2 |
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231 |
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232 def parentrevs(self, rev): |
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233 # TODO(augie): this is a node and should be a rev, but for now |
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234 # nothing in core seems to actually break. |
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235 return self.parents(rev) |
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236 |
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237 def linknode(self, node): |
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238 ancestormap = self.repo.metadatastore.getancestors(self.filename, node) |
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239 p1, p2, linknode, copyfrom = ancestormap[node] |
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240 return linknode |
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241 |
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242 def linkrev(self, node): |
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243 return self.repo.unfiltered().changelog.rev(self.linknode(node)) |
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244 |
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245 def emitrevisions(self, nodes, nodesorder=None, revisiondata=False, |
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246 assumehaveparentrevisions=False, deltaprevious=False, |
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247 deltamode=None): |
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248 # we don't use any of these parameters here |
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249 del nodesorder, revisiondata, assumehaveparentrevisions, deltaprevious |
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250 del deltamode |
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251 prevnode = None |
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252 for node in nodes: |
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253 p1, p2 = self.parents(node) |
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254 if prevnode is None: |
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255 basenode = prevnode = p1 |
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256 if basenode == node: |
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257 basenode = nullid |
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258 if basenode != nullid: |
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259 revision = None |
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260 delta = self.revdiff(basenode, node) |
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261 else: |
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262 revision = self.revision(node, raw=True) |
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263 delta = None |
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264 yield revlog.revlogrevisiondelta( |
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265 node=node, |
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266 p1node=p1, |
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267 p2node=p2, |
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268 linknode=self.linknode(node), |
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269 basenode=basenode, |
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270 flags=self.flags(node), |
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271 baserevisionsize=None, |
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272 revision=revision, |
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273 delta=delta, |
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274 ) |
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275 |
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276 def revdiff(self, node1, node2): |
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277 return mdiff.textdiff(self.revision(node1, raw=True), |
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278 self.revision(node2, raw=True)) |
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279 |
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280 def lookup(self, node): |
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281 if len(node) == 40: |
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282 node = bin(node) |
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283 if len(node) != 20: |
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284 raise error.LookupError(node, self.filename, |
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285 _('invalid lookup input')) |
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286 |
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287 return node |
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288 |
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289 def rev(self, node): |
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290 # This is a hack to make TortoiseHG work. |
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291 return node |
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292 |
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293 def node(self, rev): |
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294 # This is a hack. |
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295 if isinstance(rev, int): |
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296 raise error.ProgrammingError( |
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297 'remotefilelog does not convert integer rev to node') |
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298 return rev |
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299 |
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300 def revision(self, node, raw=False): |
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301 """returns the revlog contents at this node. |
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302 this includes the meta data traditionally included in file revlogs. |
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303 this is generally only used for bundling and communicating with vanilla |
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304 hg clients. |
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305 """ |
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306 if node == nullid: |
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307 return "" |
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308 if len(node) != 20: |
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309 raise error.LookupError(node, self.filename, |
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310 _('invalid revision input')) |
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311 |
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312 store = self.repo.contentstore |
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313 rawtext = store.get(self.filename, node) |
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314 if raw: |
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315 return rawtext |
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316 flags = store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0) |
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317 if flags == 0: |
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318 return rawtext |
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319 text, verifyhash = self._processflags(rawtext, flags, 'read') |
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320 return text |
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321 |
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322 def _processflags(self, text, flags, operation, raw=False): |
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323 # mostly copied from hg/mercurial/revlog.py |
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324 validatehash = True |
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325 orderedflags = revlog.REVIDX_FLAGS_ORDER |
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326 if operation == 'write': |
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327 orderedflags = reversed(orderedflags) |
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328 for flag in orderedflags: |
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329 if flag & flags: |
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330 vhash = True |
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331 if flag not in revlog._flagprocessors: |
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332 message = _("missing processor for flag '%#x'") % (flag) |
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333 raise revlog.RevlogError(message) |
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334 readfunc, writefunc, rawfunc = revlog._flagprocessors[flag] |
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335 if raw: |
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336 vhash = rawfunc(self, text) |
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337 elif operation == 'read': |
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338 text, vhash = readfunc(self, text) |
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339 elif operation == 'write': |
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340 text, vhash = writefunc(self, text) |
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341 validatehash = validatehash and vhash |
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342 return text, validatehash |
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343 |
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344 def _read(self, id): |
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345 """reads the raw file blob from disk, cache, or server""" |
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346 fileservice = self.repo.fileservice |
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347 localcache = fileservice.localcache |
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348 cachekey = fileserverclient.getcachekey(self.repo.name, self.filename, |
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349 id) |
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350 try: |
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351 return localcache.read(cachekey) |
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352 except KeyError: |
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353 pass |
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354 |
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355 localkey = fileserverclient.getlocalkey(self.filename, id) |
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356 localpath = os.path.join(self.localpath, localkey) |
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357 try: |
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358 return shallowutil.readfile(localpath) |
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359 except IOError: |
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360 pass |
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361 |
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362 fileservice.prefetch([(self.filename, id)]) |
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363 try: |
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364 return localcache.read(cachekey) |
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365 except KeyError: |
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366 pass |
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367 |
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368 raise error.LookupError(id, self.filename, _('no node')) |
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369 |
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370 def ancestormap(self, node): |
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371 return self.repo.metadatastore.getancestors(self.filename, node) |
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372 |
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373 def ancestor(self, a, b): |
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374 if a == nullid or b == nullid: |
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375 return nullid |
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376 |
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377 revmap, parentfunc = self._buildrevgraph(a, b) |
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378 nodemap = dict(((v, k) for (k, v) in revmap.iteritems())) |
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379 |
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380 ancs = ancestor.ancestors(parentfunc, revmap[a], revmap[b]) |
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381 if ancs: |
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382 # choose a consistent winner when there's a tie |
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383 return min(map(nodemap.__getitem__, ancs)) |
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384 return nullid |
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385 |
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386 def commonancestorsheads(self, a, b): |
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387 """calculate all the heads of the common ancestors of nodes a and b""" |
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388 |
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389 if a == nullid or b == nullid: |
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390 return nullid |
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391 |
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392 revmap, parentfunc = self._buildrevgraph(a, b) |
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393 nodemap = dict(((v, k) for (k, v) in revmap.iteritems())) |
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394 |
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395 ancs = ancestor.commonancestorsheads(parentfunc, revmap[a], revmap[b]) |
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396 return map(nodemap.__getitem__, ancs) |
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397 |
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398 def _buildrevgraph(self, a, b): |
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399 """Builds a numeric revision graph for the given two nodes. |
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400 Returns a node->rev map and a rev->[revs] parent function. |
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401 """ |
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402 amap = self.ancestormap(a) |
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403 bmap = self.ancestormap(b) |
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404 |
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405 # Union the two maps |
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406 parentsmap = collections.defaultdict(list) |
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407 allparents = set() |
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408 for mapping in (amap, bmap): |
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409 for node, pdata in mapping.iteritems(): |
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410 parents = parentsmap[node] |
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411 p1, p2, linknode, copyfrom = pdata |
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412 # Don't follow renames (copyfrom). |
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413 # remotefilectx.ancestor does that. |
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414 if p1 != nullid and not copyfrom: |
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415 parents.append(p1) |
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416 allparents.add(p1) |
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417 if p2 != nullid: |
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418 parents.append(p2) |
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419 allparents.add(p2) |
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420 |
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421 # Breadth first traversal to build linkrev graph |
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422 parentrevs = collections.defaultdict(list) |
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423 revmap = {} |
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424 queue = collections.deque(((None, n) for n in parentsmap |
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425 if n not in allparents)) |
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426 while queue: |
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427 prevrev, current = queue.pop() |
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428 if current in revmap: |
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429 if prevrev: |
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430 parentrevs[prevrev].append(revmap[current]) |
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431 continue |
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432 |
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433 # Assign linkrevs in reverse order, so start at |
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434 # len(parentsmap) and work backwards. |
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435 currentrev = len(parentsmap) - len(revmap) - 1 |
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436 revmap[current] = currentrev |
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437 |
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438 if prevrev: |
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439 parentrevs[prevrev].append(currentrev) |
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440 |
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441 for parent in parentsmap.get(current): |
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442 queue.appendleft((currentrev, parent)) |
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443 |
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444 return revmap, parentrevs.__getitem__ |
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445 |
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446 def strip(self, minlink, transaction): |
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447 pass |
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448 |
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449 # misc unused things |
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450 def files(self): |
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451 return [] |
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452 |
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453 def checksize(self): |
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454 return 0, 0 |