Mercurial > hg
annotate mercurial/bundlecaches.py @ 46858:85e3a630cad9
revlog: move the details of revlog "v2" index inside revlog.utils.constants
the revlog module is quite large and this kind of format information would handy
for other module. So let us start to gather this information about the format in
a more appropriate place.
We update various reference to this information to use the new "source of truth"
in the process.
Differential Revision: https://phab.mercurial-scm.org/D10305
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 05 Apr 2021 12:21:12 +0200 |
parents | f4c325bf80fc |
children | dc3800569157 |
rev | line source |
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1 # bundlecaches.py - utility to deal with pre-computed bundle for servers |
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2 # |
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3 # This software may be used and distributed according to the terms of the |
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4 # GNU General Public License version 2 or any later version. |
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5 |
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6 from .i18n import _ |
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7 |
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8 from .thirdparty import attr |
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9 |
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10 from . import ( |
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11 error, |
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12 requirements as requirementsmod, |
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13 sslutil, |
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14 util, |
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15 ) |
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16 from .utils import stringutil |
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17 |
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18 urlreq = util.urlreq |
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19 |
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20 CB_MANIFEST_FILE = b'clonebundles.manifest' |
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21 |
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22 |
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23 @attr.s |
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24 class bundlespec(object): |
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25 compression = attr.ib() |
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26 wirecompression = attr.ib() |
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27 version = attr.ib() |
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28 wireversion = attr.ib() |
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29 params = attr.ib() |
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30 contentopts = attr.ib() |
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31 |
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32 |
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33 # Maps bundle version human names to changegroup versions. |
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34 _bundlespeccgversions = { |
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35 b'v1': b'01', |
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36 b'v2': b'02', |
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37 b'packed1': b's1', |
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38 b'bundle2': b'02', # legacy |
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39 } |
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40 |
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41 # Maps bundle version with content opts to choose which part to bundle |
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42 _bundlespeccontentopts = { |
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43 b'v1': { |
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44 b'changegroup': True, |
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45 b'cg.version': b'01', |
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46 b'obsolescence': False, |
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47 b'phases': False, |
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48 b'tagsfnodescache': False, |
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49 b'revbranchcache': False, |
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50 }, |
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51 b'v2': { |
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52 b'changegroup': True, |
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53 b'cg.version': b'02', |
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54 b'obsolescence': False, |
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55 b'phases': False, |
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56 b'tagsfnodescache': True, |
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57 b'revbranchcache': True, |
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58 }, |
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59 b'packed1': {b'cg.version': b's1'}, |
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60 } |
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61 _bundlespeccontentopts[b'bundle2'] = _bundlespeccontentopts[b'v2'] |
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62 |
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63 _bundlespecvariants = { |
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64 b"streamv2": { |
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65 b"changegroup": False, |
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66 b"streamv2": True, |
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67 b"tagsfnodescache": False, |
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68 b"revbranchcache": False, |
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69 } |
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70 } |
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71 |
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72 # Compression engines allowed in version 1. THIS SHOULD NEVER CHANGE. |
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73 _bundlespecv1compengines = {b'gzip', b'bzip2', b'none'} |
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74 |
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75 |
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76 def parsebundlespec(repo, spec, strict=True): |
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77 """Parse a bundle string specification into parts. |
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78 |
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79 Bundle specifications denote a well-defined bundle/exchange format. |
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80 The content of a given specification should not change over time in |
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81 order to ensure that bundles produced by a newer version of Mercurial are |
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82 readable from an older version. |
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83 |
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84 The string currently has the form: |
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85 |
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86 <compression>-<type>[;<parameter0>[;<parameter1>]] |
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87 |
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88 Where <compression> is one of the supported compression formats |
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89 and <type> is (currently) a version string. A ";" can follow the type and |
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90 all text afterwards is interpreted as URI encoded, ";" delimited key=value |
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91 pairs. |
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92 |
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93 If ``strict`` is True (the default) <compression> is required. Otherwise, |
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94 it is optional. |
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95 |
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96 Returns a bundlespec object of (compression, version, parameters). |
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97 Compression will be ``None`` if not in strict mode and a compression isn't |
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98 defined. |
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99 |
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100 An ``InvalidBundleSpecification`` is raised when the specification is |
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101 not syntactically well formed. |
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102 |
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103 An ``UnsupportedBundleSpecification`` is raised when the compression or |
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104 bundle type/version is not recognized. |
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105 |
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106 Note: this function will likely eventually return a more complex data |
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107 structure, including bundle2 part information. |
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108 """ |
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109 |
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110 def parseparams(s): |
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111 if b';' not in s: |
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112 return s, {} |
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113 |
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114 params = {} |
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115 version, paramstr = s.split(b';', 1) |
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116 |
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117 for p in paramstr.split(b';'): |
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118 if b'=' not in p: |
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119 raise error.InvalidBundleSpecification( |
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120 _( |
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121 b'invalid bundle specification: ' |
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122 b'missing "=" in parameter: %s' |
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123 ) |
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124 % p |
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125 ) |
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126 |
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127 key, value = p.split(b'=', 1) |
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128 key = urlreq.unquote(key) |
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129 value = urlreq.unquote(value) |
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130 params[key] = value |
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131 |
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132 return version, params |
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133 |
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134 if strict and b'-' not in spec: |
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135 raise error.InvalidBundleSpecification( |
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136 _( |
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137 b'invalid bundle specification; ' |
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138 b'must be prefixed with compression: %s' |
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139 ) |
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140 % spec |
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141 ) |
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142 |
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143 if b'-' in spec: |
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144 compression, version = spec.split(b'-', 1) |
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145 |
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146 if compression not in util.compengines.supportedbundlenames: |
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147 raise error.UnsupportedBundleSpecification( |
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148 _(b'%s compression is not supported') % compression |
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149 ) |
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150 |
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151 version, params = parseparams(version) |
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152 |
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153 if version not in _bundlespeccgversions: |
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154 raise error.UnsupportedBundleSpecification( |
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155 _(b'%s is not a recognized bundle version') % version |
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156 ) |
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157 else: |
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158 # Value could be just the compression or just the version, in which |
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159 # case some defaults are assumed (but only when not in strict mode). |
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160 assert not strict |
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161 |
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162 spec, params = parseparams(spec) |
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163 |
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164 if spec in util.compengines.supportedbundlenames: |
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165 compression = spec |
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166 version = b'v1' |
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167 # Generaldelta repos require v2. |
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168 if requirementsmod.GENERALDELTA_REQUIREMENT in repo.requirements: |
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169 version = b'v2' |
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170 # Modern compression engines require v2. |
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171 if compression not in _bundlespecv1compengines: |
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172 version = b'v2' |
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173 elif spec in _bundlespeccgversions: |
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174 if spec == b'packed1': |
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175 compression = b'none' |
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176 else: |
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177 compression = b'bzip2' |
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178 version = spec |
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179 else: |
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180 raise error.UnsupportedBundleSpecification( |
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181 _(b'%s is not a recognized bundle specification') % spec |
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182 ) |
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183 |
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184 # Bundle version 1 only supports a known set of compression engines. |
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185 if version == b'v1' and compression not in _bundlespecv1compengines: |
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186 raise error.UnsupportedBundleSpecification( |
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187 _(b'compression engine %s is not supported on v1 bundles') |
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188 % compression |
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189 ) |
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190 |
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191 # The specification for packed1 can optionally declare the data formats |
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192 # required to apply it. If we see this metadata, compare against what the |
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193 # repo supports and error if the bundle isn't compatible. |
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194 if version == b'packed1' and b'requirements' in params: |
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195 requirements = set(params[b'requirements'].split(b',')) |
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196 missingreqs = requirements - repo.supportedformats |
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197 if missingreqs: |
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198 raise error.UnsupportedBundleSpecification( |
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199 _(b'missing support for repository features: %s') |
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200 % b', '.join(sorted(missingreqs)) |
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201 ) |
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202 |
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203 # Compute contentopts based on the version |
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204 contentopts = _bundlespeccontentopts.get(version, {}).copy() |
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205 |
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206 # Process the variants |
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207 if b"stream" in params and params[b"stream"] == b"v2": |
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208 variant = _bundlespecvariants[b"streamv2"] |
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209 contentopts.update(variant) |
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210 |
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211 engine = util.compengines.forbundlename(compression) |
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212 compression, wirecompression = engine.bundletype() |
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213 wireversion = _bundlespeccgversions[version] |
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214 |
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215 return bundlespec( |
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216 compression, wirecompression, version, wireversion, params, contentopts |
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217 ) |
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218 |
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219 |
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220 def parseclonebundlesmanifest(repo, s): |
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221 """Parses the raw text of a clone bundles manifest. |
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222 |
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223 Returns a list of dicts. The dicts have a ``URL`` key corresponding |
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224 to the URL and other keys are the attributes for the entry. |
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225 """ |
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226 m = [] |
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227 for line in s.splitlines(): |
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228 fields = line.split() |
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229 if not fields: |
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230 continue |
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231 attrs = {b'URL': fields[0]} |
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232 for rawattr in fields[1:]: |
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233 key, value = rawattr.split(b'=', 1) |
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234 key = util.urlreq.unquote(key) |
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235 value = util.urlreq.unquote(value) |
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236 attrs[key] = value |
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237 |
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238 # Parse BUNDLESPEC into components. This makes client-side |
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239 # preferences easier to specify since you can prefer a single |
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240 # component of the BUNDLESPEC. |
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241 if key == b'BUNDLESPEC': |
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242 try: |
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243 bundlespec = parsebundlespec(repo, value) |
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244 attrs[b'COMPRESSION'] = bundlespec.compression |
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245 attrs[b'VERSION'] = bundlespec.version |
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246 except error.InvalidBundleSpecification: |
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247 pass |
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248 except error.UnsupportedBundleSpecification: |
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249 pass |
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250 |
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251 m.append(attrs) |
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252 |
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253 return m |
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254 |
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255 |
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256 def isstreamclonespec(bundlespec): |
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257 # Stream clone v1 |
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258 if bundlespec.wirecompression == b'UN' and bundlespec.wireversion == b's1': |
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259 return True |
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260 |
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261 # Stream clone v2 |
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262 if ( |
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263 bundlespec.wirecompression == b'UN' |
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264 and bundlespec.wireversion == b'02' |
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265 and bundlespec.contentopts.get(b'streamv2') |
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266 ): |
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267 return True |
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268 |
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269 return False |
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270 |
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271 |
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272 def filterclonebundleentries(repo, entries, streamclonerequested=False): |
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273 """Remove incompatible clone bundle manifest entries. |
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274 |
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275 Accepts a list of entries parsed with ``parseclonebundlesmanifest`` |
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276 and returns a new list consisting of only the entries that this client |
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277 should be able to apply. |
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278 |
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279 There is no guarantee we'll be able to apply all returned entries because |
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280 the metadata we use to filter on may be missing or wrong. |
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281 """ |
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282 newentries = [] |
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283 for entry in entries: |
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284 spec = entry.get(b'BUNDLESPEC') |
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285 if spec: |
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286 try: |
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287 bundlespec = parsebundlespec(repo, spec, strict=True) |
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288 |
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289 # If a stream clone was requested, filter out non-streamclone |
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290 # entries. |
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291 if streamclonerequested and not isstreamclonespec(bundlespec): |
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292 repo.ui.debug( |
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293 b'filtering %s because not a stream clone\n' |
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294 % entry[b'URL'] |
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295 ) |
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296 continue |
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297 |
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298 except error.InvalidBundleSpecification as e: |
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299 repo.ui.debug(stringutil.forcebytestr(e) + b'\n') |
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300 continue |
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301 except error.UnsupportedBundleSpecification as e: |
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302 repo.ui.debug( |
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303 b'filtering %s because unsupported bundle ' |
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304 b'spec: %s\n' % (entry[b'URL'], stringutil.forcebytestr(e)) |
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305 ) |
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306 continue |
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307 # If we don't have a spec and requested a stream clone, we don't know |
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308 # what the entry is so don't attempt to apply it. |
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309 elif streamclonerequested: |
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310 repo.ui.debug( |
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311 b'filtering %s because cannot determine if a stream ' |
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312 b'clone bundle\n' % entry[b'URL'] |
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313 ) |
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314 continue |
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315 |
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316 if b'REQUIRESNI' in entry and not sslutil.hassni: |
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317 repo.ui.debug( |
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318 b'filtering %s because SNI not supported\n' % entry[b'URL'] |
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319 ) |
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320 continue |
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321 |
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322 if b'REQUIREDRAM' in entry: |
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323 try: |
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324 requiredram = util.sizetoint(entry[b'REQUIREDRAM']) |
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325 except error.ParseError: |
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326 repo.ui.debug( |
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327 b'filtering %s due to a bad REQUIREDRAM attribute\n' |
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328 % entry[b'URL'] |
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329 ) |
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330 continue |
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331 actualram = repo.ui.estimatememory() |
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332 if actualram is not None and actualram * 0.66 < requiredram: |
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333 repo.ui.debug( |
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334 b'filtering %s as it needs more than 2/3 of system memory\n' |
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335 % entry[b'URL'] |
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336 ) |
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337 continue |
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338 |
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339 newentries.append(entry) |
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340 |
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341 return newentries |
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342 |
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343 |
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344 class clonebundleentry(object): |
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345 """Represents an item in a clone bundles manifest. |
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346 |
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347 This rich class is needed to support sorting since sorted() in Python 3 |
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348 doesn't support ``cmp`` and our comparison is complex enough that ``key=`` |
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349 won't work. |
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350 """ |
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351 |
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352 def __init__(self, value, prefers): |
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353 self.value = value |
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354 self.prefers = prefers |
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355 |
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356 def _cmp(self, other): |
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357 for prefkey, prefvalue in self.prefers: |
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358 avalue = self.value.get(prefkey) |
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359 bvalue = other.value.get(prefkey) |
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360 |
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361 # Special case for b missing attribute and a matches exactly. |
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362 if avalue is not None and bvalue is None and avalue == prefvalue: |
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363 return -1 |
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364 |
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365 # Special case for a missing attribute and b matches exactly. |
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366 if bvalue is not None and avalue is None and bvalue == prefvalue: |
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367 return 1 |
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368 |
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369 # We can't compare unless attribute present on both. |
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370 if avalue is None or bvalue is None: |
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371 continue |
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372 |
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373 # Same values should fall back to next attribute. |
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374 if avalue == bvalue: |
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375 continue |
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376 |
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377 # Exact matches come first. |
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378 if avalue == prefvalue: |
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379 return -1 |
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380 if bvalue == prefvalue: |
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381 return 1 |
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382 |
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383 # Fall back to next attribute. |
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384 continue |
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385 |
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386 # If we got here we couldn't sort by attributes and prefers. Fall |
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387 # back to index order. |
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388 return 0 |
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389 |
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390 def __lt__(self, other): |
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391 return self._cmp(other) < 0 |
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392 |
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393 def __gt__(self, other): |
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394 return self._cmp(other) > 0 |
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395 |
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396 def __eq__(self, other): |
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397 return self._cmp(other) == 0 |
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398 |
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399 def __le__(self, other): |
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400 return self._cmp(other) <= 0 |
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401 |
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402 def __ge__(self, other): |
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403 return self._cmp(other) >= 0 |
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404 |
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405 def __ne__(self, other): |
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406 return self._cmp(other) != 0 |
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407 |
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408 |
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409 def sortclonebundleentries(ui, entries): |
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410 prefers = ui.configlist(b'ui', b'clonebundleprefers') |
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411 if not prefers: |
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412 return list(entries) |
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413 |
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414 def _split(p): |
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415 if b'=' not in p: |
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416 hint = _(b"each comma separated item should be key=value pairs") |
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417 raise error.Abort( |
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418 _(b"invalid ui.clonebundleprefers item: %s") % p, hint=hint |
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419 ) |
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420 return p.split(b'=', 1) |
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421 |
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422 prefers = [_split(p) for p in prefers] |
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423 |
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424 items = sorted(clonebundleentry(v, prefers) for v in entries) |
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425 return [i.value for i in items] |