Mercurial > hg
annotate hgext/remotefilelog/remotefilelog.py @ 49043:362312d61020
rust-dirstate-entry: fix typo in panic message
Differential Revision: https://phab.mercurial-scm.org/D12446
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Mon, 28 Mar 2022 13:01:42 +0200 |
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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 |
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9 import collections |
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10 import os |
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11 |
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12 from mercurial.node import bin |
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13 from mercurial.i18n import _ |
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14 from mercurial import ( |
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15 ancestor, |
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16 error, |
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17 mdiff, |
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18 revlog, |
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19 ) |
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20 from mercurial.utils import storageutil |
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21 from mercurial.revlogutils import flagutil |
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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 |
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30 class remotefilelognodemap: |
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31 def __init__(self, filename, store): |
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32 self._filename = filename |
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33 self._store = store |
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34 |
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35 def __contains__(self, node): |
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36 missing = self._store.getmissing([(self._filename, node)]) |
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37 return not bool(missing) |
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38 |
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39 def __get__(self, node): |
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40 if node not in self: |
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41 raise KeyError(node) |
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42 return node |
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43 |
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44 |
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45 class remotefilelog: |
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46 |
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47 _generaldelta = True |
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48 _flagserrorclass = error.RevlogError |
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49 |
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50 def __init__(self, opener, path, repo): |
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51 self.opener = opener |
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52 self.filename = path |
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53 self.repo = repo |
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54 self.nodemap = remotefilelognodemap(self.filename, repo.contentstore) |
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55 |
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56 self.version = 1 |
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57 |
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58 self._flagprocessors = dict(flagutil.flagprocessors) |
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59 |
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60 def read(self, node): |
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61 """returns the file contents at this node""" |
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62 t = self.revision(node) |
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63 if not t.startswith(b'\1\n'): |
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64 return t |
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65 s = t.index(b'\1\n', 2) |
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66 return t[s + 2 :] |
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67 |
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68 def add(self, text, meta, transaction, linknode, p1=None, p2=None): |
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69 # hash with the metadata, like in vanilla filelogs |
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70 hashtext = shallowutil.createrevlogtext( |
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71 text, meta.get(b'copy'), meta.get(b'copyrev') |
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72 ) |
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73 node = storageutil.hashrevisionsha1(hashtext, p1, p2) |
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74 return self.addrevision( |
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75 hashtext, transaction, linknode, p1, p2, node=node |
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76 ) |
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77 |
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78 def _createfileblob(self, text, meta, flags, p1, p2, node, linknode): |
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79 # text passed to "_createfileblob" does not include filelog metadata |
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80 header = shallowutil.buildfileblobheader(len(text), flags) |
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81 data = b"%s\0%s" % (header, text) |
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82 |
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83 realp1 = p1 |
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84 copyfrom = b"" |
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85 if meta and b'copy' in meta: |
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86 copyfrom = meta[b'copy'] |
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87 realp1 = bin(meta[b'copyrev']) |
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88 |
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89 data += b"%s%s%s%s%s\0" % (node, realp1, p2, linknode, copyfrom) |
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90 |
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91 visited = set() |
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92 |
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93 pancestors = {} |
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94 queue = [] |
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95 if realp1 != self.repo.nullid: |
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96 p1flog = self |
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97 if copyfrom: |
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98 p1flog = remotefilelog(self.opener, copyfrom, self.repo) |
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99 |
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100 pancestors.update(p1flog.ancestormap(realp1)) |
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101 queue.append(realp1) |
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102 visited.add(realp1) |
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103 if p2 != self.repo.nullid: |
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104 pancestors.update(self.ancestormap(p2)) |
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105 queue.append(p2) |
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106 visited.add(p2) |
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107 |
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108 ancestortext = b"" |
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109 |
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110 # add the ancestors in topological order |
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111 while queue: |
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112 c = queue.pop(0) |
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113 pa1, pa2, ancestorlinknode, pacopyfrom = pancestors[c] |
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114 |
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115 pacopyfrom = pacopyfrom or b'' |
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116 ancestortext += b"%s%s%s%s%s\0" % ( |
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117 c, |
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118 pa1, |
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119 pa2, |
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120 ancestorlinknode, |
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121 pacopyfrom, |
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122 ) |
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123 |
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124 if pa1 != self.repo.nullid and pa1 not in visited: |
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125 queue.append(pa1) |
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126 visited.add(pa1) |
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127 if pa2 != self.repo.nullid and pa2 not in visited: |
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128 queue.append(pa2) |
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129 visited.add(pa2) |
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130 |
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131 data += ancestortext |
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132 |
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133 return data |
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134 |
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135 def addrevision( |
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136 self, |
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137 text, |
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138 transaction, |
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139 linknode, |
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140 p1, |
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141 p2, |
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142 cachedelta=None, |
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143 node=None, |
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144 flags=revlog.REVIDX_DEFAULT_FLAGS, |
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145 sidedata=None, |
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146 ): |
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147 # text passed to "addrevision" includes hg filelog metadata header |
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148 if node is None: |
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149 node = storageutil.hashrevisionsha1(text, p1, p2) |
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150 |
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151 meta, metaoffset = storageutil.parsemeta(text) |
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152 rawtext, validatehash = flagutil.processflagswrite( |
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153 self, |
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154 text, |
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155 flags, |
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156 ) |
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157 return self.addrawrevision( |
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158 rawtext, |
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159 transaction, |
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160 linknode, |
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161 p1, |
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162 p2, |
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163 node, |
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164 flags, |
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165 cachedelta, |
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166 _metatuple=(meta, metaoffset), |
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167 ) |
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168 |
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169 def addrawrevision( |
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170 self, |
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171 rawtext, |
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172 transaction, |
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173 linknode, |
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174 p1, |
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175 p2, |
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176 node, |
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177 flags, |
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178 cachedelta=None, |
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179 _metatuple=None, |
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180 ): |
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181 if _metatuple: |
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182 # _metatuple: used by "addrevision" internally by remotefilelog |
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183 # meta was parsed confidently |
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184 meta, metaoffset = _metatuple |
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185 else: |
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186 # not from self.addrevision, but something else (repo._filecommit) |
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187 # calls addrawrevision directly. remotefilelog needs to get and |
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188 # strip filelog metadata. |
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189 # we don't have confidence about whether rawtext contains filelog |
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190 # metadata or not (flag processor could replace it), so we just |
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191 # parse it as best-effort. |
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192 # in LFS (flags != 0)'s case, the best way is to call LFS code to |
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193 # get the meta information, instead of storageutil.parsemeta. |
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194 meta, metaoffset = storageutil.parsemeta(rawtext) |
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195 if flags != 0: |
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196 # when flags != 0, be conservative and do not mangle rawtext, since |
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197 # a read flag processor expects the text not being mangled at all. |
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198 metaoffset = 0 |
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199 if metaoffset: |
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200 # remotefilelog fileblob stores copy metadata in its ancestortext, |
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201 # not its main blob. so we need to remove filelog metadata |
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202 # (containing copy information) from text. |
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203 blobtext = rawtext[metaoffset:] |
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204 else: |
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205 blobtext = rawtext |
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206 data = self._createfileblob( |
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207 blobtext, meta, flags, p1, p2, node, linknode |
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208 ) |
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209 self.repo.contentstore.addremotefilelognode(self.filename, node, data) |
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210 |
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211 return node |
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212 |
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213 def renamed(self, node): |
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214 ancestors = self.repo.metadatastore.getancestors(self.filename, node) |
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215 p1, p2, linknode, copyfrom = ancestors[node] |
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216 if copyfrom: |
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217 return (copyfrom, p1) |
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218 |
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219 return False |
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220 |
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221 def size(self, node): |
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222 """return the size of a given revision""" |
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223 return len(self.read(node)) |
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224 |
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225 rawsize = size |
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226 |
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227 def cmp(self, node, text): |
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228 """compare text with a given file revision |
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229 |
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230 returns True if text is different than what is stored. |
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231 """ |
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232 |
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233 if node == self.repo.nullid: |
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234 return True |
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235 |
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236 nodetext = self.read(node) |
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237 return nodetext != text |
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238 |
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239 def __nonzero__(self): |
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240 return True |
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241 |
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242 __bool__ = __nonzero__ |
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243 |
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244 def __len__(self): |
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245 if self.filename in (b'.hgtags', b'.hgsub', b'.hgsubstate'): |
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246 # Global tag and subrepository support require access to the |
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247 # file history for various performance sensitive operations. |
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248 # excludepattern should be used for repositories depending on |
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249 # those features to fallback to regular filelog. |
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250 return 0 |
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251 |
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252 raise RuntimeError(b"len not supported") |
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253 |
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254 def heads(self): |
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255 # Fake heads of the filelog to satisfy hgweb. |
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256 return [] |
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257 |
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258 def empty(self): |
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259 return False |
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260 |
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261 def flags(self, node): |
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262 if isinstance(node, int): |
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263 raise error.ProgrammingError( |
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264 b'remotefilelog does not accept integer rev for flags' |
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265 ) |
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266 store = self.repo.contentstore |
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267 return store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0) |
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268 |
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269 def parents(self, node): |
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270 if node == self.repo.nullid: |
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271 return self.repo.nullid, self.repo.nullid |
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272 |
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273 ancestormap = self.repo.metadatastore.getancestors(self.filename, node) |
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274 p1, p2, linknode, copyfrom = ancestormap[node] |
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275 if copyfrom: |
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276 p1 = self.repo.nullid |
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277 |
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278 return p1, p2 |
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279 |
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280 def parentrevs(self, rev): |
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281 # TODO(augie): this is a node and should be a rev, but for now |
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282 # nothing in core seems to actually break. |
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283 return self.parents(rev) |
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284 |
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285 def linknode(self, node): |
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286 ancestormap = self.repo.metadatastore.getancestors(self.filename, node) |
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287 p1, p2, linknode, copyfrom = ancestormap[node] |
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288 return linknode |
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289 |
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290 def linkrev(self, node): |
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291 return self.repo.unfiltered().changelog.rev(self.linknode(node)) |
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292 |
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293 def emitrevisions( |
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294 self, |
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295 nodes, |
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296 nodesorder=None, |
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297 revisiondata=False, |
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298 assumehaveparentrevisions=False, |
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299 deltaprevious=False, |
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300 deltamode=None, |
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301 sidedata_helpers=None, |
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302 ): |
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303 # we don't use any of these parameters here |
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304 del nodesorder, revisiondata, assumehaveparentrevisions, deltaprevious |
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305 del deltamode |
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306 prevnode = None |
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307 for node in nodes: |
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308 p1, p2 = self.parents(node) |
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309 if prevnode is None: |
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310 basenode = prevnode = p1 |
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311 if basenode == node: |
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312 basenode = self.repo.nullid |
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313 if basenode != self.repo.nullid: |
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314 revision = None |
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315 delta = self.revdiff(basenode, node) |
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316 else: |
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317 revision = self.rawdata(node) |
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318 delta = None |
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319 yield revlog.revlogrevisiondelta( |
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320 node=node, |
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321 p1node=p1, |
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322 p2node=p2, |
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323 linknode=self.linknode(node), |
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324 basenode=basenode, |
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325 flags=self.flags(node), |
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326 baserevisionsize=None, |
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327 revision=revision, |
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328 delta=delta, |
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329 # Sidedata is not supported yet |
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330 sidedata=None, |
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331 # Protocol flags are not used yet |
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332 protocol_flags=0, |
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333 ) |
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334 |
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335 def revdiff(self, node1, node2): |
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336 return mdiff.textdiff(self.rawdata(node1), self.rawdata(node2)) |
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337 |
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338 def lookup(self, node): |
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339 if len(node) == 40: |
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340 node = bin(node) |
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341 if len(node) != 20: |
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342 raise error.LookupError( |
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343 node, self.filename, _(b'invalid lookup input') |
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344 ) |
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345 |
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346 return node |
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347 |
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348 def rev(self, node): |
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349 # This is a hack to make TortoiseHG work. |
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350 return node |
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351 |
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352 def node(self, rev): |
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353 # This is a hack. |
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354 if isinstance(rev, int): |
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355 raise error.ProgrammingError( |
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356 b'remotefilelog does not convert integer rev to node' |
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357 ) |
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358 return rev |
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359 |
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360 def revision(self, node, raw=False): |
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361 """returns the revlog contents at this node. |
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362 this includes the meta data traditionally included in file revlogs. |
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363 this is generally only used for bundling and communicating with vanilla |
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364 hg clients. |
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365 """ |
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366 if node == self.repo.nullid: |
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367 return b"" |
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368 if len(node) != 20: |
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369 raise error.LookupError( |
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370 node, self.filename, _(b'invalid revision input') |
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371 ) |
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372 if ( |
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373 node == self.repo.nodeconstants.wdirid |
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374 or node in self.repo.nodeconstants.wdirfilenodeids |
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375 ): |
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376 raise error.WdirUnsupported |
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377 |
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378 store = self.repo.contentstore |
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379 rawtext = store.get(self.filename, node) |
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380 if raw: |
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381 return rawtext |
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382 flags = store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0) |
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383 if flags == 0: |
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384 return rawtext |
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385 return flagutil.processflagsread(self, rawtext, flags)[0] |
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386 |
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387 def rawdata(self, node): |
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388 return self.revision(node, raw=False) |
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389 |
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390 def _read(self, id): |
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391 """reads the raw file blob from disk, cache, or server""" |
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392 fileservice = self.repo.fileservice |
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393 localcache = fileservice.localcache |
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394 cachekey = fileserverclient.getcachekey( |
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395 self.repo.name, self.filename, id |
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396 ) |
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397 try: |
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398 return localcache.read(cachekey) |
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399 except KeyError: |
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400 pass |
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401 |
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402 localkey = fileserverclient.getlocalkey(self.filename, id) |
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403 localpath = os.path.join(self.localpath, localkey) |
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404 try: |
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405 return shallowutil.readfile(localpath) |
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406 except IOError: |
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407 pass |
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408 |
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409 fileservice.prefetch([(self.filename, id)]) |
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410 try: |
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411 return localcache.read(cachekey) |
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412 except KeyError: |
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413 pass |
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414 |
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415 raise error.LookupError(id, self.filename, _(b'no node')) |
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416 |
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417 def ancestormap(self, node): |
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418 return self.repo.metadatastore.getancestors(self.filename, node) |
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419 |
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420 def ancestor(self, a, b): |
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421 if a == self.repo.nullid or b == self.repo.nullid: |
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422 return self.repo.nullid |
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423 |
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424 revmap, parentfunc = self._buildrevgraph(a, b) |
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425 nodemap = {v: k for (k, v) in revmap.items()} |
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426 |
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427 ancs = ancestor.ancestors(parentfunc, revmap[a], revmap[b]) |
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428 if ancs: |
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429 # choose a consistent winner when there's a tie |
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430 return min(map(nodemap.__getitem__, ancs)) |
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431 return self.repo.nullid |
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432 |
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433 def commonancestorsheads(self, a, b): |
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434 """calculate all the heads of the common ancestors of nodes a and b""" |
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435 |
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436 if a == self.repo.nullid or b == self.repo.nullid: |
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437 return self.repo.nullid |
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438 |
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439 revmap, parentfunc = self._buildrevgraph(a, b) |
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440 nodemap = {v: k for (k, v) in revmap.items()} |
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441 |
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442 ancs = ancestor.commonancestorsheads(parentfunc, revmap[a], revmap[b]) |
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443 return map(nodemap.__getitem__, ancs) |
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444 |
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445 def _buildrevgraph(self, a, b): |
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446 """Builds a numeric revision graph for the given two nodes. |
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447 Returns a node->rev map and a rev->[revs] parent function. |
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448 """ |
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449 amap = self.ancestormap(a) |
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450 bmap = self.ancestormap(b) |
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451 |
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452 # Union the two maps |
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453 parentsmap = collections.defaultdict(list) |
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454 allparents = set() |
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455 for mapping in (amap, bmap): |
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456 for node, pdata in mapping.items(): |
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457 parents = parentsmap[node] |
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458 p1, p2, linknode, copyfrom = pdata |
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459 # Don't follow renames (copyfrom). |
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460 # remotefilectx.ancestor does that. |
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461 if p1 != self.repo.nullid and not copyfrom: |
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462 parents.append(p1) |
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463 allparents.add(p1) |
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464 if p2 != self.repo.nullid: |
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465 parents.append(p2) |
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466 allparents.add(p2) |
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467 |
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468 # Breadth first traversal to build linkrev graph |
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469 parentrevs = collections.defaultdict(list) |
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470 revmap = {} |
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471 queue = collections.deque( |
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472 ((None, n) for n in parentsmap if n not in allparents) |
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473 ) |
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474 while queue: |
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475 prevrev, current = queue.pop() |
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476 if current in revmap: |
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477 if prevrev: |
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478 parentrevs[prevrev].append(revmap[current]) |
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479 continue |
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480 |
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481 # Assign linkrevs in reverse order, so start at |
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482 # len(parentsmap) and work backwards. |
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483 currentrev = len(parentsmap) - len(revmap) - 1 |
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484 revmap[current] = currentrev |
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485 |
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486 if prevrev: |
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487 parentrevs[prevrev].append(currentrev) |
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488 |
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489 for parent in parentsmap.get(current): |
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490 queue.appendleft((currentrev, parent)) |
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491 |
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492 return revmap, parentrevs.__getitem__ |
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493 |
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494 def strip(self, minlink, transaction): |
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495 pass |
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496 |
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497 # misc unused things |
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498 def files(self): |
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499 return [] |
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500 |
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501 def checksize(self): |
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502 return 0, 0 |