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annotate hgext/obsolete.py @ 129:3ad25876ee68

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obsolete: lazy relation adding
author Pierre-Yves David <pierre-yves.david@logilab.fr>
date Tue, 10 Jan 2012 19:52:44 +0100
parents 6bcbf7f6ceed
children 3124889cad55
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1 # obsolete.py - introduce the obsolete concept in mercurial.
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2 #
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3 # Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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4 # Logilab SA <contact@logilab.fr>
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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 """Introduce the Obsolete concept to mercurial
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9
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10 General concept
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11 ===============
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13 This extension introduces the *obsolete* concept. It adds a new *obsolete*
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14 relation between two changesets. A relation ``<changeset B> obsolete <changeset
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15 A>`` is set to denote that ``<changeset B>`` is new version of ``<changeset
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16 A>``.
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17
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18 The *obsolete* relation act as a **perpendicular history** to the standard
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19 changeset history. Standard changeset history versions files. The *obsolete*
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20 relation versions changesets.
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21
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22 :obsolete: a changeset that have been replace by another one.
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23 :unstable: a non-obsolet changeset based on another one.
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24 :suspended: an obsolete changeset with unstable descendant.
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25
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26 Another name for unstable could be out of sync.
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30 Usage and Feature
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31 =================
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32
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34 Display and Exchange
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35 ....................
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36
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37 obsolete changesets are hidden. (except if they have non obsolete changeset)
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38
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39 obsolete changesets are currently not exchange. This will probably change later
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40 but it was the simpler solution for now.
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41
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42 New commands
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43 ............
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44
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45 a ``debugobsolete`` command has been added.
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46
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47 It add an obsolete relation between too relation.
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48
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49 Context object
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50 ..............
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51
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52 Context gain a ``obsolete`` method that return True if a changeset is obsolete
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53 False otherwise.
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54
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55 revset
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56 ......
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57
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58 Add an ``obsolete()`` entry.
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59
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60 repo extension
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61 ..............
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62
69
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63 To Do
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64 -----
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65
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66 * refuse to obsolete published changesets
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67
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68 * handle split
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70 * handle conflict
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71
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72 * handle unstable // out of sync
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73
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74 """
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75 import os
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76 try:
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77 from cStringIO import StringIO
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78 except ImportError:
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79 from StringIO import StringIO
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80
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81 from mercurial.i18n import _
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82
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83 import base64
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84
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85 from mercurial import util
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86 from mercurial import context
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87 from mercurial import revset
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88 from mercurial import scmutil
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89 from mercurial import extensions
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90 from mercurial import pushkey
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91 from mercurial import discovery
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92 from mercurial import error
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9906560f585e [obsolete] issue a warning when parent of current directory is obsolete.
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93 from mercurial import commands
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94 from mercurial import changelog
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95 from mercurial import phases
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96 from mercurial.node import hex, bin, short, nullid
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97 from mercurial.lock import release
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98
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99 ### Patch changectx
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100 #############################
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101
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102 def obsolete(ctx):
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103 """is the changeset obsolete by other"""
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104 if ctx.node()is None:
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105 return False
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106 return bool(ctx._repo.obsoletedby(ctx.node())) and ctx.phase()
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107
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108 context.changectx.obsolete = obsolete
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109
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110
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111 ### revset
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112 #############################
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113
112
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114
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115 def revsetobsolete(repo, subset, x):
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116 """filter obsolet entry"""
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117 args = revset.getargs(x, 0, 0, 'publicheads takes no arguments')
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118 return [r for r in subset if r in repo._obsoleteset and repo._phaserev[r] > 0]
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119
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120 ### Other Extension compat
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121 ############################
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122
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123 def concludenode(orig, repo, rev, *args, **kwargs):
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124 """wrapper for rebase 's concludenode that set obsolete relation"""
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125 newrev = orig(repo, rev, *args, **kwargs)
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126 oldnode = repo[rev].node()
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127 newnode = repo[newrev].node()
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128 repo.addobsolete(newnode, oldnode)
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129 return newrev
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130
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131 def cmdrebase(orig, repo, ui, *args, **kwargs):
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132 oldkeep = kwargs.pop('keep', False)
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133 if oldkeep:
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134 ui.warn('WARNING --keep option ignored by experimental obsolete extension')
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135 kwargs['keep'] = True
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136 return orig(repo, ui, *args, **kwargs)
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137
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138
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139
39
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140 def extsetup(ui):
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141
39
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142 revset.symbols["obsolete"] = revsetobsolete
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143
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144
42
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145 try:
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146 rebase = extensions.find('rebase')
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147 if rebase:
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148 extensions.wrapfunction(rebase, 'concludenode', concludenode)
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149 extensions.wrapcommand(rebase.cmdtable, "rebase", cmdrebase)
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150 except KeyError:
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151 pass # rebase not found
39
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152
44
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153 # Pushkey mechanism for mutable
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154 #########################################
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155
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156 def pushobsolete(repo, key, old, raw):
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157 """push obsolete relation through pushkey"""
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158 assert key == "relations"
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159 w = repo.wlock()
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160 try:
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161 tmp = StringIO()
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162 tmp.write(raw)
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163 tmp.seek(0)
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164 relations = _obsdeserialise(tmp)
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165 for sub, objs in relations.iteritems():
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166 for obj in objs:
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167 try:
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168 repo.addobsolete(sub, obj)
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169 except error.RepoLookupError:
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170 pass
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171 return 0
44
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172 finally:
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173 w.release()
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174
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175 def listobsolete(repo):
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176 """dump all obsolete relation in
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177
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178 XXX this have be improved"""
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179 tmp = StringIO()
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180 _obsserialise(repo._obssubrels, tmp)
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181 return {'relations': base64.b64encode(tmp.getvalue())}
44
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182
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183 pushkey.register('obsolete', pushobsolete, listobsolete)
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184
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185 ### New commands
32
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186 #############################
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187
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188
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189 def cmddebugobsolete(ui, repo, subject, object):
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190 """Add an obsolete relation between a too node
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191
37
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192 The subject is expected to be a newer version of the object"""
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193 sub = repo[subject]
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194 obj = repo[object]
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195 repo.addobsolete(sub.node(), obj.node())
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196 return 0
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197
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198 cmdtable = {'debugobsolete': (cmddebugobsolete, [], '<subject> <object>')}
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199
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200 ### Altering existing command
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201 #############################
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202
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203 def wrapmayobsoletewc(origfn, ui, repo, *args, **opts):
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204 res = origfn(ui, repo, *args, **opts)
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205 if repo['.'].obsolete():
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206 ui.warn(_('Working directory parent is obsolete\n'))
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207 return res
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208
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209 def uisetup(ui):
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210 extensions.wrapcommand(commands.table, "update", wrapmayobsoletewc)
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211 extensions.wrapcommand(commands.table, "pull", wrapmayobsoletewc)
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212
70
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213 ### serialisation
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214 #############################
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215
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216 def _obsserialise(obssubrels, flike):
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217 """serialise an obsolete relation mapping in a plain text one
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218
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219 this is for subject -> [objects] mapping
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220
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221 format is::
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222
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223 <subject-full-hex> <object-full-hex>\n"""
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224 for sub, objs in obssubrels.iteritems():
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225 for obj in objs:
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226 if sub is None:
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227 sub = nullid
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228 flike.write('%s %s\n' % (hex(sub), hex(obj)))
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229
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230 def _obsdeserialise(flike):
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231 """read a file like object serialised with _obsserialise
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232
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233 this desierialize into a {subject -> objects} mapping"""
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234 rels = {}
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235 for line in flike:
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236 subhex, objhex = line.split()
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237 subnode = bin(subhex)
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238 if subnode == nullid:
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239 subnode = None
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240 rels.setdefault( subnode, set()).add(bin(objhex))
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241 return rels
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242
87
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243 ### diagnostique tools
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244 #############################
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245
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246 def unstables(repo):
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247 """Return all unstable changeset"""
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248 return scmutil.revrange(repo, ['obsolete():: and (not obsolete())'])
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249
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250 def newerversion(repo, obs):
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251 """Return the newer version of an obsolete changeset"""
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252 toproceed = set([obs])
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253 # XXX know optimization available
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254 newer = set()
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255 while toproceed:
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256 current = toproceed.pop()
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257 if current in repo._obsobjrels:
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258 toproceed.update(repo._obsobjrels[current])
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259 elif current is not None: # None is kill
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diff changeset
260 newer.add(current)
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261 return sorted(newer)
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262
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263
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264 ### repo subclassing
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265 #############################
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266
32
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267 def reposetup(ui, repo):
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268
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269 if not repo.local():
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270 return
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271
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272 opull = repo.pull
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273 opush = repo.push
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274 orollback = repo.rollback
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275 o_writejournal = repo._writejournal
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276 ocancopy = repo.cancopy
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277
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278 class obsoletingrepo(repo.__class__):
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279
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280 ### Public method
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281 def obsoletedby(self, node):
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282 """return the set of node that make <node> obsolete (obj)"""
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283 return self._obsobjrels.get(node, set())
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284
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285 def obsolete(self, node):
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286 """return the set of node that <node> make obsolete (sub)"""
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287 return self._obssubrels.get(node, set())
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288
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289 @util.propertycache
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290 def _obsoleteset(self):
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291 obs = set()
126
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292 nm = self.changelog.nodemap
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293 for obj in self._obsobjrels:
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294 rev = nm.get(obj, None)
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295 if rev is not None:
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296 obs.add(rev)
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297 return obs
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298
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299 def addobsolete(self, sub, obj):
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300 """Add a relation marking that node <sub> is a new version of <obj>"""
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301 if sub == nullid:
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302 sub = None
129
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303 if obj in self._obssubrels.get(sub, set()):
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304 return 0
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305 self._obssubrels.setdefault(sub, set()).add(obj)
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306 self._obsobjrels.setdefault(obj, set()).add(sub)
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307 try:
112
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308 if self[obj].phase() == 0:
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309 if sub is None:
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310 self.ui.warn(
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311 _("trying to kill immutable changeset %(obj)s\n")
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312 % {'obj': short(obj)})
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313 if sub is not None:
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314 self.ui.warn(
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315 _("%(sub)s try to obsolete immutable changeset %(obj)s\n")
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316 % {'sub': short(sub), 'obj': short(obj)})
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317 self.changelog.hiddenrevs.add(repo[obj].rev())
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318 except (error.RepoLookupError, error.LookupError):
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319 pass #unknow revision (but keep propagating the data
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320 self._writeobsrels()
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321 if '_obsobjrels' in vars(self):
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322 del self._obsobjrels
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323 if '_obssubrels' in vars(self):
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324 del self._obssubrels
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325 if '_obsoleteset' in vars(self):
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326 del self._obsoleteset
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327 return 1
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328
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329 ### obsolete storage
32
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330 @util.propertycache
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331 def _obsobjrels(self):
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332 """{<old-node> -> set(<new-node>)}
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333
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334 also compute hidden revision"""
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335 #reverse sub -> objs mapping
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336 objrels = {}
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337 for sub, objs in self._obssubrels.iteritems():
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338 for obj in objs:
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339 objrels.setdefault(obj, set()).add(sub)
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340 return objrels
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341
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342 @util.propertycache
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343 def _obssubrels(self):
37
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344 """{<new-node> -> set(<old-node>)}"""
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345 return self._readobsrels()
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346
54
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347
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348
32
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349
37
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350 ### Disk IO
32
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351 def _readobsrels(self):
37
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352 """Write obsolete relation on disk"""
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353 # XXX handle lock
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354 try:
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355 f = self.opener('obsolete-relations')
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356 try:
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357 return _obsdeserialise(f)
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358 finally:
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359 f.close()
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360 except IOError:
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361 return {}
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362
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363 def _writeobsrels(self):
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364 """Write obsolete relation on disk"""
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365 # XXX handle lock
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366 lock = self.wlock()
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367 try:
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368 f = self.opener('obsolete-relations', 'w', atomictemp=True)
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369 try:
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370 _obsserialise(self._obssubrels, f)
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371 try:
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372 f.rename()
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373 except AttributeError: # old version
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374 f.close()
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375 finally:
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376 f.close()
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377 finally:
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378 lock.release()
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379
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380 ### local clone support
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381
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382 def cancopy(self):
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383 """wrapper on cancopy that deny copy if there is obsolete relation"""
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384 return ocancopy() and not bool(self._obsobjrels) # you can't copy if there is obsolete
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385
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386 ### pull // push support
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387
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388 def pull(self, remote, *args, **kwargs):
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389 """wrapper around push that push obsolete relation"""
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390 result = opull(remote, *args, **kwargs)
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391 if 'obsolete' in remote.listkeys('namespaces'):
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392 tmp = StringIO()
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393 rels = remote.listkeys('obsolete')['relations']
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394 tmp.write(base64.b64decode(rels))
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395 tmp.seek(0)
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af4f7ef0a3c1 [obsolete] extract serialization logic.
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396 obsrels = _obsdeserialise(tmp)
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397 for sub, objs in obsrels.iteritems():
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398 for obj in objs:
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399 self.addobsolete(sub, obj)
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400 return result
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401
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402 def push(self, remote, *args, **opts):
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403 """wrapper around pull that pull obsolete relation"""
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404 result = opush(remote, *args, **opts)
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405 if 'obsolete' in remote.listkeys('namespaces'):
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406 tmp = StringIO()
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407 _obsserialise(self._obssubrels, tmp)
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408 remote.pushkey('obsolete', 'relations', '', tmp.getvalue())
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409
44
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410 return result
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411
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412
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413
52
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414 ### rollback support
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415
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416 def _writejournal(self, desc):
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417 """wrapped version of _writejournal that save obsolete data"""
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418 entries = list(o_writejournal(desc))
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419 filename = 'obsolete-relations'
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420 filepath = self.join(filename)
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421 if os.path.exists(filepath):
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422 journalname = 'journal.' + filename
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423 journalpath = self.join(journalname)
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424 util.copyfile(filepath, journalpath)
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425 entries.append(journalpath)
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426 return tuple(entries)
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427
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428 def rollback(self, dryrun=False, **kwargs):
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429 """wrapped version of rollback that restore obsolete data"""
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430 wlock = lock = None
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431 try:
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432 wlock = self.wlock()
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433 lock = self.lock()
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434 ret = orollback(dryrun, **kwargs)
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435 if not (ret or dryrun): #rollback did not failed
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436 src = self.join('undo.obsolete-relations')
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437 dst = self.join('obsolete-relations')
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438 if os.path.exists(src):
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439 util.rename(src, dst)
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440 elif os.path.exists(dst): #unlink in any case
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441 os.unlink(dst)
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442 # invalidate cache
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443 self.__dict__.pop('_obssubrels', None)
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444 self.__dict__.pop('_obsobjrels', None)
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445 return ret
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446 finally:
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447 release(lock, wlock)
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448
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449 @scmutil.filecache('00changelog.i', True)
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450 def changelog(self):
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451 changelog = getattr(super(obsoletingrepo, self), 'changelog')
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452 old = changelog.__dict__.pop('hiddenrevs', ())
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453 if old:
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454 ui.warn("old wasn't empty ? %r" % old)
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455 def _sethidden(changelog, value):
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456 assert not value
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457
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458
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459 class hchangelog(changelog.__class__):
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460 @util.propertycache
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461 def hiddenrevs(changelog):
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462 shown = ['not obsolete()', '.', 'bookmark()', 'tagged()',
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463 'public()']
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464 basicquery = 'obsolete() - (::(%s))' % (' or '.join(shown))
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465 # !!! self is repo not changelog
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466 result = set(scmutil.revrange(self, [basicquery]))
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467 return result
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468 changelog.__class__ = hchangelog
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469 return changelog
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diff changeset
470
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diff changeset
471
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diff changeset
472
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diff changeset
473
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c27491be4431 obsolet: basic support (hide changeset)
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474 repo.__class__ = obsoletingrepo
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d60eddda9546 add an option to ensure unstable are secret
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475 if repo.ui.configbool('obsolete', 'secret-unstable', True):
124
c6af5921bb74 obsolete: clever obsolete not in secret detection to avoid locking the repo without a reason.
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476 expobs = [c.node() for c in repo.set('obsolete() - secret()')]
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477 if expobs: # do not lock in nothing move. locking for peanut make hgview reload on any command
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478 lock = repo.lock()
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diff changeset
479 try:
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480 phases.retractboundary(repo, 2, expobs)
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481 finally:
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diff changeset
482 lock.release()
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c27491be4431 obsolet: basic support (hide changeset)
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diff changeset
483
115
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diff changeset
484