Mercurial > hg
annotate hgext/remotefilelog/remotefilelog.py @ 51690:493034cc3265
black: format the codebase with 23.3.0
The CI has moved to 23.3.0, which is the last version that supports 3.7
at runtime, so we should honor this change.
# skip-blame mass-reformating only
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Thu, 18 Jul 2024 12:36:12 +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 |
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11 from mercurial.node import bin |
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12 from mercurial.i18n import _ |
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13 from mercurial import ( |
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14 ancestor, |
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15 error, |
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16 mdiff, |
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17 revlog, |
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18 ) |
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19 from mercurial.utils import storageutil |
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20 from mercurial.revlogutils import flagutil |
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21 |
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22 from . import ( |
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23 constants, |
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24 shallowutil, |
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25 ) |
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26 |
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27 |
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28 class remotefilelognodemap: |
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29 def __init__(self, filename, store): |
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30 self._filename = filename |
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31 self._store = store |
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32 |
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33 def __contains__(self, node): |
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34 missing = self._store.getmissing([(self._filename, node)]) |
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35 return not bool(missing) |
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36 |
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37 def __get__(self, node): |
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38 if node not in self: |
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39 raise KeyError(node) |
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40 return node |
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41 |
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42 |
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43 class remotefilelog: |
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44 _flagserrorclass = error.RevlogError |
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45 |
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46 def __init__(self, opener, path, repo): |
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47 self.opener = opener |
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48 self.filename = path |
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49 self.repo = repo |
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50 self.nodemap = remotefilelognodemap(self.filename, repo.contentstore) |
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51 |
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52 self.version = 1 |
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53 |
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54 self._flagprocessors = dict(flagutil.flagprocessors) |
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55 |
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56 def read(self, node): |
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57 """returns the file contents at this node""" |
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58 t = self.revision(node) |
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59 if not t.startswith(b'\1\n'): |
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60 return t |
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61 s = t.index(b'\1\n', 2) |
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62 return t[s + 2 :] |
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63 |
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64 def add(self, text, meta, transaction, linknode, p1=None, p2=None): |
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65 # hash with the metadata, like in vanilla filelogs |
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66 hashtext = shallowutil.createrevlogtext( |
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67 text, meta.get(b'copy'), meta.get(b'copyrev') |
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68 ) |
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69 node = storageutil.hashrevisionsha1(hashtext, p1, p2) |
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70 return self.addrevision( |
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71 hashtext, transaction, linknode, p1, p2, node=node |
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72 ) |
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73 |
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74 def _createfileblob(self, text, meta, flags, p1, p2, node, linknode): |
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75 # text passed to "_createfileblob" does not include filelog metadata |
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76 header = shallowutil.buildfileblobheader(len(text), flags) |
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77 data = b"%s\0%s" % (header, text) |
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78 |
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79 realp1 = p1 |
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80 copyfrom = b"" |
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81 if meta and b'copy' in meta: |
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82 copyfrom = meta[b'copy'] |
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83 realp1 = bin(meta[b'copyrev']) |
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84 |
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85 data += b"%s%s%s%s%s\0" % (node, realp1, p2, linknode, copyfrom) |
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86 |
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87 visited = set() |
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88 |
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89 pancestors = {} |
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90 queue = [] |
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91 if realp1 != self.repo.nullid: |
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92 p1flog = self |
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93 if copyfrom: |
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94 p1flog = remotefilelog(self.opener, copyfrom, self.repo) |
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95 |
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96 pancestors.update(p1flog.ancestormap(realp1)) |
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97 queue.append(realp1) |
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98 visited.add(realp1) |
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99 if p2 != self.repo.nullid: |
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100 pancestors.update(self.ancestormap(p2)) |
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101 queue.append(p2) |
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102 visited.add(p2) |
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103 |
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104 ancestortext = b"" |
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105 |
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106 # add the ancestors in topological order |
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107 while queue: |
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108 c = queue.pop(0) |
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109 pa1, pa2, ancestorlinknode, pacopyfrom = pancestors[c] |
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110 |
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111 pacopyfrom = pacopyfrom or b'' |
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112 ancestortext += b"%s%s%s%s%s\0" % ( |
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113 c, |
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114 pa1, |
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115 pa2, |
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116 ancestorlinknode, |
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117 pacopyfrom, |
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118 ) |
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119 |
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120 if pa1 != self.repo.nullid and pa1 not in visited: |
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121 queue.append(pa1) |
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122 visited.add(pa1) |
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123 if pa2 != self.repo.nullid and pa2 not in visited: |
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124 queue.append(pa2) |
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125 visited.add(pa2) |
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126 |
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127 data += ancestortext |
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128 |
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129 return data |
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130 |
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131 def addrevision( |
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132 self, |
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133 text, |
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134 transaction, |
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135 linknode, |
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136 p1, |
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137 p2, |
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138 cachedelta=None, |
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139 node=None, |
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140 flags=revlog.REVIDX_DEFAULT_FLAGS, |
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141 sidedata=None, |
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142 ): |
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143 # text passed to "addrevision" includes hg filelog metadata header |
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144 if node is None: |
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145 node = storageutil.hashrevisionsha1(text, p1, p2) |
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146 |
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147 meta, metaoffset = storageutil.parsemeta(text) |
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148 rawtext, validatehash = flagutil.processflagswrite( |
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149 self, |
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150 text, |
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151 flags, |
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152 ) |
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153 return self.addrawrevision( |
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154 rawtext, |
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155 transaction, |
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156 linknode, |
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157 p1, |
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158 p2, |
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159 node, |
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160 flags, |
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161 cachedelta, |
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162 _metatuple=(meta, metaoffset), |
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163 ) |
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164 |
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165 def addrawrevision( |
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166 self, |
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167 rawtext, |
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168 transaction, |
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169 linknode, |
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170 p1, |
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171 p2, |
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172 node, |
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173 flags, |
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174 cachedelta=None, |
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175 _metatuple=None, |
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176 ): |
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177 if _metatuple: |
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178 # _metatuple: used by "addrevision" internally by remotefilelog |
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179 # meta was parsed confidently |
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180 meta, metaoffset = _metatuple |
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181 else: |
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182 # not from self.addrevision, but something else (repo._filecommit) |
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183 # calls addrawrevision directly. remotefilelog needs to get and |
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184 # strip filelog metadata. |
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185 # we don't have confidence about whether rawtext contains filelog |
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186 # metadata or not (flag processor could replace it), so we just |
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187 # parse it as best-effort. |
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188 # in LFS (flags != 0)'s case, the best way is to call LFS code to |
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189 # get the meta information, instead of storageutil.parsemeta. |
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190 meta, metaoffset = storageutil.parsemeta(rawtext) |
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191 if flags != 0: |
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192 # when flags != 0, be conservative and do not mangle rawtext, since |
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193 # a read flag processor expects the text not being mangled at all. |
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194 metaoffset = 0 |
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195 if metaoffset: |
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196 # remotefilelog fileblob stores copy metadata in its ancestortext, |
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197 # not its main blob. so we need to remove filelog metadata |
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198 # (containing copy information) from text. |
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199 blobtext = rawtext[metaoffset:] |
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200 else: |
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201 blobtext = rawtext |
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202 data = self._createfileblob( |
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203 blobtext, meta, flags, p1, p2, node, linknode |
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204 ) |
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205 self.repo.contentstore.addremotefilelognode(self.filename, node, data) |
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206 |
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207 return node |
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208 |
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209 def renamed(self, node): |
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210 ancestors = self.repo.metadatastore.getancestors(self.filename, node) |
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211 p1, p2, linknode, copyfrom = ancestors[node] |
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212 if copyfrom: |
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213 return (copyfrom, p1) |
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214 |
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215 return False |
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216 |
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217 def size(self, node): |
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218 """return the size of a given revision""" |
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219 return len(self.read(node)) |
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220 |
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221 rawsize = size |
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222 |
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223 def cmp(self, node, text): |
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224 """compare text with a given file revision |
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225 |
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226 returns True if text is different than what is stored. |
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227 """ |
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228 |
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229 if node == self.repo.nullid: |
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230 return True |
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231 |
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232 nodetext = self.read(node) |
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233 return nodetext != text |
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234 |
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235 def __nonzero__(self): |
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236 return True |
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237 |
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238 __bool__ = __nonzero__ |
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239 |
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240 def __len__(self): |
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241 if self.filename in (b'.hgtags', b'.hgsub', b'.hgsubstate'): |
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242 # Global tag and subrepository support require access to the |
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243 # file history for various performance sensitive operations. |
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244 # excludepattern should be used for repositories depending on |
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245 # those features to fallback to regular filelog. |
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246 return 0 |
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247 |
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248 raise RuntimeError(b"len not supported") |
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249 |
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250 def heads(self): |
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251 # Fake heads of the filelog to satisfy hgweb. |
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252 return [] |
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253 |
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254 def empty(self): |
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255 return False |
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256 |
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257 def flags(self, node): |
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258 if isinstance(node, int): |
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259 raise error.ProgrammingError( |
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260 b'remotefilelog does not accept integer rev for flags' |
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261 ) |
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262 store = self.repo.contentstore |
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263 return store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0) |
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264 |
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265 def parents(self, node): |
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266 if node == self.repo.nullid: |
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267 return self.repo.nullid, self.repo.nullid |
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268 |
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269 ancestormap = self.repo.metadatastore.getancestors(self.filename, node) |
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270 p1, p2, linknode, copyfrom = ancestormap[node] |
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271 if copyfrom: |
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272 p1 = self.repo.nullid |
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273 |
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274 return p1, p2 |
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275 |
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276 def parentrevs(self, rev): |
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277 # TODO(augie): this is a node and should be a rev, but for now |
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278 # nothing in core seems to actually break. |
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279 return self.parents(rev) |
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280 |
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281 def linknode(self, node): |
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282 ancestormap = self.repo.metadatastore.getancestors(self.filename, node) |
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283 p1, p2, linknode, copyfrom = ancestormap[node] |
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284 return linknode |
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285 |
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286 def linkrev(self, node): |
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287 return self.repo.unfiltered().changelog.rev(self.linknode(node)) |
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288 |
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289 def emitrevisions( |
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290 self, |
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291 nodes, |
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292 nodesorder=None, |
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293 revisiondata=False, |
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294 assumehaveparentrevisions=False, |
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295 deltaprevious=False, |
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296 deltamode=None, |
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297 sidedata_helpers=None, |
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298 debug_info=None, |
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299 ): |
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300 # we don't use any of these parameters here |
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301 del nodesorder, revisiondata, assumehaveparentrevisions, deltaprevious |
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302 del deltamode |
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303 prevnode = None |
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304 for node in nodes: |
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305 p1, p2 = self.parents(node) |
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306 if prevnode is None: |
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307 basenode = prevnode = p1 |
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308 if basenode == node: |
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309 basenode = self.repo.nullid |
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310 if basenode != self.repo.nullid: |
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311 revision = None |
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312 delta = self.revdiff(basenode, node) |
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313 else: |
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314 revision = self.rawdata(node) |
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315 delta = None |
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316 yield revlog.revlogrevisiondelta( |
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317 node=node, |
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318 p1node=p1, |
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319 p2node=p2, |
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320 linknode=self.linknode(node), |
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321 basenode=basenode, |
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322 flags=self.flags(node), |
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323 baserevisionsize=None, |
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324 revision=revision, |
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325 delta=delta, |
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326 # Sidedata is not supported yet |
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327 sidedata=None, |
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328 # Protocol flags are not used yet |
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329 protocol_flags=0, |
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330 ) |
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331 |
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332 def revdiff(self, node1, node2): |
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333 return mdiff.textdiff(self.rawdata(node1), self.rawdata(node2)) |
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334 |
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335 def lookup(self, node): |
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336 if len(node) == 40: |
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337 node = bin(node) |
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338 if len(node) != 20: |
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339 raise error.LookupError( |
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340 node, self.filename, _(b'invalid lookup input') |
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341 ) |
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342 |
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343 return node |
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344 |
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345 def rev(self, node): |
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346 # This is a hack to make TortoiseHG work. |
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347 return node |
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348 |
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349 def node(self, rev): |
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350 # This is a hack. |
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351 if isinstance(rev, int): |
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352 raise error.ProgrammingError( |
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353 b'remotefilelog does not convert integer rev to node' |
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354 ) |
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355 return rev |
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356 |
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357 def revision(self, node, raw=False): |
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358 """returns the revlog contents at this node. |
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359 this includes the meta data traditionally included in file revlogs. |
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360 this is generally only used for bundling and communicating with vanilla |
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361 hg clients. |
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362 """ |
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363 if node == self.repo.nullid: |
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364 return b"" |
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365 if len(node) != 20: |
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366 raise error.LookupError( |
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367 node, self.filename, _(b'invalid revision input') |
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368 ) |
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369 if ( |
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370 node == self.repo.nodeconstants.wdirid |
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371 or node in self.repo.nodeconstants.wdirfilenodeids |
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372 ): |
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373 raise error.WdirUnsupported |
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374 |
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375 store = self.repo.contentstore |
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376 rawtext = store.get(self.filename, node) |
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377 if raw: |
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378 return rawtext |
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379 flags = store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0) |
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380 if flags == 0: |
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381 return rawtext |
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382 return flagutil.processflagsread(self, rawtext, flags)[0] |
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383 |
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384 def rawdata(self, node): |
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385 return self.revision(node, raw=False) |
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386 |
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387 def ancestormap(self, node): |
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388 return self.repo.metadatastore.getancestors(self.filename, node) |
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389 |
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390 def ancestor(self, a, b): |
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391 if a == self.repo.nullid or b == self.repo.nullid: |
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392 return self.repo.nullid |
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393 |
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394 revmap, parentfunc = self._buildrevgraph(a, b) |
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395 nodemap = {v: k for (k, v) in revmap.items()} |
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396 |
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397 ancs = ancestor.ancestors(parentfunc, revmap[a], revmap[b]) |
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398 if ancs: |
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399 # choose a consistent winner when there's a tie |
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400 return min(map(nodemap.__getitem__, ancs)) |
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401 return self.repo.nullid |
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402 |
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403 def commonancestorsheads(self, a, b): |
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404 """calculate all the heads of the common ancestors of nodes a and b""" |
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405 |
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406 if a == self.repo.nullid or b == self.repo.nullid: |
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407 return self.repo.nullid |
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408 |
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409 revmap, parentfunc = self._buildrevgraph(a, b) |
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410 nodemap = {v: k for (k, v) in revmap.items()} |
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411 |
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412 ancs = ancestor.commonancestorsheads(parentfunc, revmap[a], revmap[b]) |
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413 return map(nodemap.__getitem__, ancs) |
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414 |
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415 def _buildrevgraph(self, a, b): |
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416 """Builds a numeric revision graph for the given two nodes. |
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417 Returns a node->rev map and a rev->[revs] parent function. |
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418 """ |
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419 amap = self.ancestormap(a) |
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420 bmap = self.ancestormap(b) |
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421 |
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422 # Union the two maps |
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423 parentsmap = collections.defaultdict(list) |
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424 allparents = set() |
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425 for mapping in (amap, bmap): |
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426 for node, pdata in mapping.items(): |
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427 parents = parentsmap[node] |
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428 p1, p2, linknode, copyfrom = pdata |
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429 # Don't follow renames (copyfrom). |
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430 # remotefilectx.ancestor does that. |
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431 if p1 != self.repo.nullid and not copyfrom: |
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432 parents.append(p1) |
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433 allparents.add(p1) |
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434 if p2 != self.repo.nullid: |
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435 parents.append(p2) |
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436 allparents.add(p2) |
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437 |
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438 # Breadth first traversal to build linkrev graph |
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439 parentrevs = collections.defaultdict(list) |
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440 revmap = {} |
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441 queue = collections.deque( |
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442 ((None, n) for n in parentsmap if n not in allparents) |
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443 ) |
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444 while queue: |
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445 prevrev, current = queue.pop() |
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446 if current in revmap: |
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447 if prevrev: |
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448 parentrevs[prevrev].append(revmap[current]) |
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449 continue |
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450 |
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451 # Assign linkrevs in reverse order, so start at |
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452 # len(parentsmap) and work backwards. |
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453 currentrev = len(parentsmap) - len(revmap) - 1 |
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454 revmap[current] = currentrev |
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455 |
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456 if prevrev: |
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457 parentrevs[prevrev].append(currentrev) |
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458 |
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459 for parent in parentsmap.get(current): |
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460 queue.appendleft((currentrev, parent)) |
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461 |
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462 return revmap, parentrevs.__getitem__ |
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463 |
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464 def strip(self, minlink, transaction): |
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465 pass |
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466 |
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467 # misc unused things |
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468 def files(self): |
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469 return [] |
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470 |
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471 def checksize(self): |
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472 return 0, 0 |