Mercurial > hg
annotate hgext/narrow/narrowbundle2.py @ 45372:77b8588dd84e
requirements: introduce new requirements related module
It was not clear where all requirements should and related APIs should be, this
patch introduces a requirements module which will have all exitsing requirements
and related APIs.
Differential Revision: https://phab.mercurial-scm.org/D8917
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Sat, 08 Aug 2020 16:24:12 +0530 |
parents | e58e234096de |
children | 10284ce3d5ed |
rev | line source |
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1 # narrowbundle2.py - bundle2 extensions for narrow repository support |
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2 # |
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3 # Copyright 2017 Google, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import errno |
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11 import struct |
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12 |
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13 from mercurial.i18n import _ |
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14 from mercurial.node import nullid |
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15 from mercurial import ( |
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16 bundle2, |
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17 changegroup, |
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18 error, |
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19 exchange, |
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20 localrepo, |
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21 narrowspec, |
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22 repair, |
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23 requirements, |
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24 scmutil, |
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25 util, |
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26 wireprototypes, |
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27 ) |
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28 from mercurial.utils import stringutil |
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29 |
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30 _NARROWACL_SECTION = b'narrowacl' |
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31 _CHANGESPECPART = b'narrow:changespec' |
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32 _RESSPECS = b'narrow:responsespec' |
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33 _SPECPART = b'narrow:spec' |
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34 _SPECPART_INCLUDE = b'include' |
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35 _SPECPART_EXCLUDE = b'exclude' |
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36 _KILLNODESIGNAL = b'KILL' |
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37 _DONESIGNAL = b'DONE' |
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38 _ELIDEDCSHEADER = b'>20s20s20sl' # cset id, p1, p2, len(text) |
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39 _ELIDEDMFHEADER = b'>20s20s20s20sl' # manifest id, p1, p2, link id, len(text) |
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40 _CSHEADERSIZE = struct.calcsize(_ELIDEDCSHEADER) |
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41 _MFHEADERSIZE = struct.calcsize(_ELIDEDMFHEADER) |
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42 |
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43 # Serve a changegroup for a client with a narrow clone. |
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44 def getbundlechangegrouppart_narrow( |
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45 bundler, |
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46 repo, |
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47 source, |
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48 bundlecaps=None, |
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49 b2caps=None, |
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50 heads=None, |
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51 common=None, |
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52 **kwargs |
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53 ): |
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54 assert repo.ui.configbool(b'experimental', b'narrowservebrokenellipses') |
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55 |
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56 cgversions = b2caps.get(b'changegroup') |
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57 cgversions = [ |
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58 v |
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59 for v in cgversions |
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60 if v in changegroup.supportedoutgoingversions(repo) |
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61 ] |
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62 if not cgversions: |
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63 raise ValueError(_(b'no common changegroup version')) |
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64 version = max(cgversions) |
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65 |
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66 include = sorted(filter(bool, kwargs.get('includepats', []))) |
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67 exclude = sorted(filter(bool, kwargs.get('excludepats', []))) |
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68 generateellipsesbundle2( |
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69 bundler, |
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70 repo, |
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71 include, |
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72 exclude, |
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73 version, |
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74 common, |
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75 heads, |
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76 kwargs.get('depth', None), |
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77 ) |
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78 |
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79 |
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80 def generateellipsesbundle2( |
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81 bundler, repo, include, exclude, version, common, heads, depth, |
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82 ): |
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83 match = narrowspec.match(repo.root, include=include, exclude=exclude) |
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84 if depth is not None: |
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85 depth = int(depth) |
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86 if depth < 1: |
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87 raise error.Abort(_(b'depth must be positive, got %d') % depth) |
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88 |
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89 heads = set(heads or repo.heads()) |
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90 common = set(common or [nullid]) |
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91 |
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92 visitnodes, relevant_nodes, ellipsisroots = exchange._computeellipsis( |
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93 repo, common, heads, set(), match, depth=depth |
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94 ) |
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95 |
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96 repo.ui.debug(b'Found %d relevant revs\n' % len(relevant_nodes)) |
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97 if visitnodes: |
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98 packer = changegroup.getbundler( |
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99 version, |
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100 repo, |
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101 matcher=match, |
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102 ellipses=True, |
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103 shallow=depth is not None, |
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104 ellipsisroots=ellipsisroots, |
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105 fullnodes=relevant_nodes, |
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106 ) |
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107 cgdata = packer.generate(common, visitnodes, False, b'narrow_widen') |
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108 |
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109 part = bundler.newpart(b'changegroup', data=cgdata) |
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110 part.addparam(b'version', version) |
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111 if requirements.TREEMANIFEST_REQUIREMENT in repo.requirements: |
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112 part.addparam(b'treemanifest', b'1') |
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113 |
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114 |
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115 def generate_ellipses_bundle2_for_widening( |
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116 bundler, repo, oldmatch, newmatch, version, common, known, |
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117 ): |
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118 common = set(common or [nullid]) |
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119 # Steps: |
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120 # 1. Send kill for "$known & ::common" |
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121 # |
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122 # 2. Send changegroup for ::common |
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123 # |
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124 # 3. Proceed. |
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125 # |
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126 # In the future, we can send kills for only the specific |
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127 # nodes we know should go away or change shape, and then |
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128 # send a data stream that tells the client something like this: |
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129 # |
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130 # a) apply this changegroup |
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131 # b) apply nodes XXX, YYY, ZZZ that you already have |
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132 # c) goto a |
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133 # |
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134 # until they've built up the full new state. |
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135 knownrevs = {repo.changelog.rev(n) for n in known} |
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136 # TODO: we could send only roots() of this set, and the |
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137 # list of nodes in common, and the client could work out |
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138 # what to strip, instead of us explicitly sending every |
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139 # single node. |
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140 deadrevs = knownrevs |
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141 |
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142 def genkills(): |
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143 for r in deadrevs: |
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144 yield _KILLNODESIGNAL |
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145 yield repo.changelog.node(r) |
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146 yield _DONESIGNAL |
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147 |
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148 bundler.newpart(_CHANGESPECPART, data=genkills()) |
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149 newvisit, newfull, newellipsis = exchange._computeellipsis( |
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150 repo, set(), common, knownrevs, newmatch |
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151 ) |
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152 if newvisit: |
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153 packer = changegroup.getbundler( |
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154 version, |
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155 repo, |
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156 matcher=newmatch, |
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157 ellipses=True, |
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158 shallow=False, |
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159 ellipsisroots=newellipsis, |
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160 fullnodes=newfull, |
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161 ) |
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162 cgdata = packer.generate(common, newvisit, False, b'narrow_widen') |
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163 |
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164 part = bundler.newpart(b'changegroup', data=cgdata) |
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165 part.addparam(b'version', version) |
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166 if requirements.TREEMANIFEST_REQUIREMENT in repo.requirements: |
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167 part.addparam(b'treemanifest', b'1') |
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168 |
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169 |
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170 @bundle2.parthandler(_SPECPART, (_SPECPART_INCLUDE, _SPECPART_EXCLUDE)) |
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171 def _handlechangespec_2(op, inpart): |
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172 # XXX: This bundle2 handling is buggy and should be removed after hg5.2 is |
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173 # released. New servers will send a mandatory bundle2 part named |
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174 # 'Narrowspec' and will send specs as data instead of params. |
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175 # Refer to issue5952 and 6019 |
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176 includepats = set(inpart.params.get(_SPECPART_INCLUDE, b'').splitlines()) |
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177 excludepats = set(inpart.params.get(_SPECPART_EXCLUDE, b'').splitlines()) |
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178 narrowspec.validatepatterns(includepats) |
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179 narrowspec.validatepatterns(excludepats) |
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180 |
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181 if not requirements.NARROW_REQUIREMENT in op.repo.requirements: |
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182 op.repo.requirements.add(requirements.NARROW_REQUIREMENT) |
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183 scmutil.writereporequirements(op.repo) |
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184 op.repo.setnarrowpats(includepats, excludepats) |
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185 narrowspec.copytoworkingcopy(op.repo) |
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186 |
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187 |
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188 @bundle2.parthandler(_RESSPECS) |
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189 def _handlenarrowspecs(op, inpart): |
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190 data = inpart.read() |
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191 inc, exc = data.split(b'\0') |
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192 includepats = set(inc.splitlines()) |
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193 excludepats = set(exc.splitlines()) |
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194 narrowspec.validatepatterns(includepats) |
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195 narrowspec.validatepatterns(excludepats) |
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196 |
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197 if requirements.NARROW_REQUIREMENT not in op.repo.requirements: |
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198 op.repo.requirements.add(requirements.NARROW_REQUIREMENT) |
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199 scmutil.writereporequirements(op.repo) |
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200 op.repo.setnarrowpats(includepats, excludepats) |
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201 narrowspec.copytoworkingcopy(op.repo) |
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202 |
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203 |
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204 @bundle2.parthandler(_CHANGESPECPART) |
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205 def _handlechangespec(op, inpart): |
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206 repo = op.repo |
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207 cl = repo.changelog |
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208 |
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209 # changesets which need to be stripped entirely. either they're no longer |
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210 # needed in the new narrow spec, or the server is sending a replacement |
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211 # in the changegroup part. |
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212 clkills = set() |
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213 |
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214 # A changespec part contains all the updates to ellipsis nodes |
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215 # that will happen as a result of widening or narrowing a |
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216 # repo. All the changes that this block encounters are ellipsis |
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217 # nodes or flags to kill an existing ellipsis. |
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218 chunksignal = changegroup.readexactly(inpart, 4) |
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219 while chunksignal != _DONESIGNAL: |
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220 if chunksignal == _KILLNODESIGNAL: |
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221 # a node used to be an ellipsis but isn't anymore |
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222 ck = changegroup.readexactly(inpart, 20) |
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223 if cl.hasnode(ck): |
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224 clkills.add(ck) |
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225 else: |
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226 raise error.Abort( |
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227 _(b'unexpected changespec node chunk type: %s') % chunksignal |
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228 ) |
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229 chunksignal = changegroup.readexactly(inpart, 4) |
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230 |
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231 if clkills: |
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232 # preserve bookmarks that repair.strip() would otherwise strip |
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233 op._bookmarksbackup = repo._bookmarks |
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234 |
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235 class dummybmstore(dict): |
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236 def applychanges(self, repo, tr, changes): |
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237 pass |
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238 |
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239 localrepo.localrepository._bookmarks.set(repo, dummybmstore()) |
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240 chgrpfile = repair.strip( |
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241 op.ui, repo, list(clkills), backup=True, topic=b'widen' |
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242 ) |
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243 if chgrpfile: |
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244 op._widen_uninterr = repo.ui.uninterruptible() |
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245 op._widen_uninterr.__enter__() |
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246 # presence of _widen_bundle attribute activates widen handler later |
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247 op._widen_bundle = chgrpfile |
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248 # Set the new narrowspec if we're widening. The setnewnarrowpats() method |
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249 # will currently always be there when using the core+narrowhg server, but |
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250 # other servers may include a changespec part even when not widening (e.g. |
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251 # because we're deepening a shallow repo). |
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252 if util.safehasattr(repo, 'setnewnarrowpats'): |
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253 repo.setnewnarrowpats() |
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254 |
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255 |
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256 def handlechangegroup_widen(op, inpart): |
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257 """Changegroup exchange handler which restores temporarily-stripped nodes""" |
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258 # We saved a bundle with stripped node data we must now restore. |
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259 # This approach is based on mercurial/repair.py@6ee26a53c111. |
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260 repo = op.repo |
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261 ui = op.ui |
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262 |
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263 chgrpfile = op._widen_bundle |
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264 del op._widen_bundle |
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265 vfs = repo.vfs |
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266 |
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267 ui.note(_(b"adding branch\n")) |
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268 f = vfs.open(chgrpfile, b"rb") |
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269 try: |
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270 gen = exchange.readbundle(ui, f, chgrpfile, vfs) |
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271 # silence internal shuffling chatter |
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272 override = {(b'ui', b'quiet'): True} |
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273 if ui.verbose: |
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274 override = {} |
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275 with ui.configoverride(override): |
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276 if isinstance(gen, bundle2.unbundle20): |
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277 with repo.transaction(b'strip') as tr: |
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278 bundle2.processbundle(repo, gen, lambda: tr) |
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279 else: |
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280 gen.apply( |
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281 repo, b'strip', b'bundle:' + vfs.join(chgrpfile), True |
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282 ) |
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283 finally: |
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284 f.close() |
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285 |
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286 # remove undo files |
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287 for undovfs, undofile in repo.undofiles(): |
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288 try: |
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289 undovfs.unlink(undofile) |
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290 except OSError as e: |
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291 if e.errno != errno.ENOENT: |
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292 ui.warn( |
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293 _(b'error removing %s: %s\n') |
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294 % (undovfs.join(undofile), stringutil.forcebytestr(e)) |
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295 ) |
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296 |
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297 # Remove partial backup only if there were no exceptions |
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298 op._widen_uninterr.__exit__(None, None, None) |
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299 vfs.unlink(chgrpfile) |
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300 |
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301 |
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302 def setup(): |
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303 """Enable narrow repo support in bundle2-related extension points.""" |
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304 getbundleargs = wireprototypes.GETBUNDLE_ARGUMENTS |
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305 |
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306 getbundleargs[b'narrow'] = b'boolean' |
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307 getbundleargs[b'depth'] = b'plain' |
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308 getbundleargs[b'oldincludepats'] = b'csv' |
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309 getbundleargs[b'oldexcludepats'] = b'csv' |
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310 getbundleargs[b'known'] = b'csv' |
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311 |
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312 # Extend changegroup serving to handle requests from narrow clients. |
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313 origcgfn = exchange.getbundle2partsmapping[b'changegroup'] |
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314 |
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315 def wrappedcgfn(*args, **kwargs): |
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316 repo = args[1] |
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317 if repo.ui.has_section(_NARROWACL_SECTION): |
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318 kwargs = exchange.applynarrowacl(repo, kwargs) |
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319 |
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320 if kwargs.get('narrow', False) and repo.ui.configbool( |
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321 b'experimental', b'narrowservebrokenellipses' |
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322 ): |
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323 getbundlechangegrouppart_narrow(*args, **kwargs) |
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324 else: |
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325 origcgfn(*args, **kwargs) |
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326 |
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327 exchange.getbundle2partsmapping[b'changegroup'] = wrappedcgfn |
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328 |
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329 # Extend changegroup receiver so client can fixup after widen requests. |
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330 origcghandler = bundle2.parthandlermapping[b'changegroup'] |
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331 |
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332 def wrappedcghandler(op, inpart): |
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333 origcghandler(op, inpart) |
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334 if util.safehasattr(op, '_widen_bundle'): |
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335 handlechangegroup_widen(op, inpart) |
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336 if util.safehasattr(op, '_bookmarksbackup'): |
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337 localrepo.localrepository._bookmarks.set( |
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338 op.repo, op._bookmarksbackup |
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339 ) |
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340 del op._bookmarksbackup |
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341 |
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342 wrappedcghandler.params = origcghandler.params |
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343 bundle2.parthandlermapping[b'changegroup'] = wrappedcghandler |