Mercurial > hg
annotate mercurial/repository.py @ 34879:7d51a7792f52
subrepo: implement 'unshare' for Mercurial subrepos
I think there's a slight hole here in that a subrepo could be shared, removed
from .hgsub, and then it's not part of context.substate (so not iterated over).
But the push command has the same hole IIRC, and I think removing a subrepo is
an edge case.
The import hack is a copy/paste of subrepo.subrepo().
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Tue, 17 Oct 2017 22:55:33 -0400 |
parents | a0aad86b3b6a |
children | 0dfb5672f015 |
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1 # repository.py - Interfaces and base classes for repositories and peers. |
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2 # |
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3 # Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com> |
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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 abc |
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11 |
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12 from .i18n import _ |
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13 from . import ( |
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14 error, |
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15 ) |
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16 |
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17 class _basepeer(object): |
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18 """Represents a "connection" to a repository. |
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19 |
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20 This is the base interface for representing a connection to a repository. |
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21 It holds basic properties and methods applicable to all peer types. |
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22 |
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23 This is not a complete interface definition and should not be used |
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24 outside of this module. |
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25 """ |
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26 __metaclass__ = abc.ABCMeta |
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27 |
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28 @abc.abstractproperty |
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29 def ui(self): |
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30 """ui.ui instance.""" |
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31 |
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32 @abc.abstractmethod |
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33 def url(self): |
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34 """Returns a URL string representing this peer. |
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35 |
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36 Currently, implementations expose the raw URL used to construct the |
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37 instance. It may contain credentials as part of the URL. The |
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38 expectations of the value aren't well-defined and this could lead to |
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39 data leakage. |
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40 |
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41 TODO audit/clean consumers and more clearly define the contents of this |
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42 value. |
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43 """ |
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44 |
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45 @abc.abstractmethod |
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46 def local(self): |
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47 """Returns a local repository instance. |
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48 |
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49 If the peer represents a local repository, returns an object that |
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50 can be used to interface with it. Otherwise returns ``None``. |
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51 """ |
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52 |
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53 @abc.abstractmethod |
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54 def peer(self): |
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55 """Returns an object conforming to this interface. |
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56 |
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57 Most implementations will ``return self``. |
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58 """ |
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59 |
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60 @abc.abstractmethod |
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61 def canpush(self): |
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62 """Returns a boolean indicating if this peer can be pushed to.""" |
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63 |
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64 @abc.abstractmethod |
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65 def close(self): |
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66 """Close the connection to this peer. |
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67 |
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68 This is called when the peer will no longer be used. Resources |
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69 associated with the peer should be cleaned up. |
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70 """ |
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71 |
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72 class _basewirecommands(object): |
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73 """Client-side interface for communicating over the wire protocol. |
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74 |
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75 This interface is used as a gateway to the Mercurial wire protocol. |
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76 methods commonly call wire protocol commands of the same name. |
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77 """ |
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78 __metaclass__ = abc.ABCMeta |
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79 |
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80 @abc.abstractmethod |
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81 def branchmap(self): |
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82 """Obtain heads in named branches. |
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83 |
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84 Returns a dict mapping branch name to an iterable of nodes that are |
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85 heads on that branch. |
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86 """ |
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87 |
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88 @abc.abstractmethod |
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89 def capabilities(self): |
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90 """Obtain capabilities of the peer. |
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91 |
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92 Returns a set of string capabilities. |
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93 """ |
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94 |
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95 @abc.abstractmethod |
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96 def debugwireargs(self, one, two, three=None, four=None, five=None): |
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97 """Used to facilitate debugging of arguments passed over the wire.""" |
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98 |
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99 @abc.abstractmethod |
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100 def getbundle(self, source, **kwargs): |
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101 """Obtain remote repository data as a bundle. |
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102 |
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103 This command is how the bulk of repository data is transferred from |
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104 the peer to the local repository |
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105 |
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106 Returns a generator of bundle data. |
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107 """ |
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108 |
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109 @abc.abstractmethod |
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110 def heads(self): |
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111 """Determine all known head revisions in the peer. |
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112 |
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113 Returns an iterable of binary nodes. |
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114 """ |
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115 |
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116 @abc.abstractmethod |
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117 def known(self, nodes): |
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118 """Determine whether multiple nodes are known. |
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119 |
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120 Accepts an iterable of nodes whose presence to check for. |
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121 |
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122 Returns an iterable of booleans indicating of the corresponding node |
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123 at that index is known to the peer. |
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124 """ |
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125 |
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126 @abc.abstractmethod |
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127 def listkeys(self, namespace): |
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128 """Obtain all keys in a pushkey namespace. |
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129 |
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130 Returns an iterable of key names. |
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131 """ |
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132 |
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133 @abc.abstractmethod |
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134 def lookup(self, key): |
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135 """Resolve a value to a known revision. |
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136 |
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137 Returns a binary node of the resolved revision on success. |
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138 """ |
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139 |
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140 @abc.abstractmethod |
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141 def pushkey(self, namespace, key, old, new): |
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142 """Set a value using the ``pushkey`` protocol. |
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143 |
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144 Arguments correspond to the pushkey namespace and key to operate on and |
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145 the old and new values for that key. |
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146 |
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147 Returns a string with the peer result. The value inside varies by the |
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148 namespace. |
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149 """ |
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150 |
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151 @abc.abstractmethod |
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152 def stream_out(self): |
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153 """Obtain streaming clone data. |
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154 |
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155 Successful result should be a generator of data chunks. |
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156 """ |
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157 |
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158 @abc.abstractmethod |
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159 def unbundle(self, bundle, heads, url): |
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160 """Transfer repository data to the peer. |
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161 |
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162 This is how the bulk of data during a push is transferred. |
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163 |
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164 Returns the integer number of heads added to the peer. |
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165 """ |
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166 |
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167 class _baselegacywirecommands(object): |
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168 """Interface for implementing support for legacy wire protocol commands. |
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169 |
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170 Wire protocol commands transition to legacy status when they are no longer |
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171 used by modern clients. To facilitate identifying which commands are |
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172 legacy, the interfaces are split. |
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173 """ |
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174 __metaclass__ = abc.ABCMeta |
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175 |
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176 @abc.abstractmethod |
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177 def between(self, pairs): |
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178 """Obtain nodes between pairs of nodes. |
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179 |
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180 ``pairs`` is an iterable of node pairs. |
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181 |
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182 Returns an iterable of iterables of nodes corresponding to each |
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183 requested pair. |
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184 """ |
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185 |
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186 @abc.abstractmethod |
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187 def branches(self, nodes): |
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188 """Obtain ancestor changesets of specific nodes back to a branch point. |
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189 |
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190 For each requested node, the peer finds the first ancestor node that is |
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191 a DAG root or is a merge. |
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192 |
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193 Returns an iterable of iterables with the resolved values for each node. |
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194 """ |
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195 |
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196 @abc.abstractmethod |
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197 def changegroup(self, nodes, kind): |
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198 """Obtain a changegroup with data for descendants of specified nodes.""" |
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199 |
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200 @abc.abstractmethod |
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201 def changegroupsubset(self, bases, heads, kind): |
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202 pass |
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203 |
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204 class peer(_basepeer, _basewirecommands): |
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205 """Unified interface and base class for peer repositories. |
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206 |
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207 All peer instances must inherit from this class and conform to its |
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208 interface. |
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209 """ |
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210 |
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211 @abc.abstractmethod |
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212 def iterbatch(self): |
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213 """Obtain an object to be used for multiple method calls. |
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214 |
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215 Various operations call several methods on peer instances. If each |
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216 method call were performed immediately and serially, this would |
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217 require round trips to remote peers and/or would slow down execution. |
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218 |
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219 Some peers have the ability to "batch" method calls to avoid costly |
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220 round trips or to facilitate concurrent execution. |
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221 |
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222 This method returns an object that can be used to indicate intent to |
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223 perform batched method calls. |
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224 |
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225 The returned object is a proxy of this peer. It intercepts calls to |
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226 batchable methods and queues them instead of performing them |
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227 immediately. This proxy object has a ``submit`` method that will |
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228 perform all queued batchable method calls. A ``results()`` method |
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229 exposes the results of queued/batched method calls. It is a generator |
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230 of results in the order they were called. |
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231 |
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232 Not all peers or wire protocol implementations may actually batch method |
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233 calls. However, they must all support this API. |
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234 """ |
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235 |
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236 def capable(self, name): |
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237 """Determine support for a named capability. |
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238 |
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239 Returns ``False`` if capability not supported. |
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240 |
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241 Returns ``True`` if boolean capability is supported. Returns a string |
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242 if capability support is non-boolean. |
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243 """ |
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244 caps = self.capabilities() |
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245 if name in caps: |
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246 return True |
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247 |
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248 name = '%s=' % name |
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249 for cap in caps: |
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250 if cap.startswith(name): |
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251 return cap[len(name):] |
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252 |
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253 return False |
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254 |
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255 def requirecap(self, name, purpose): |
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256 """Require a capability to be present. |
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257 |
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258 Raises a ``CapabilityError`` if the capability isn't present. |
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259 """ |
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260 if self.capable(name): |
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261 return |
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262 |
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263 raise error.CapabilityError( |
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264 _('cannot %s; remote repository does not support the %r ' |
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265 'capability') % (purpose, name)) |
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266 |
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267 class legacypeer(peer, _baselegacywirecommands): |
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268 """peer but with support for legacy wire protocol commands.""" |