Mercurial > hg
annotate mercurial/phases.py @ 30068:a76d5ba7ac43
pull: grab wlock during pull
because pull might move bookmarks and bookmark are protected by wlock, we have
to grab wlock for pull :-(
This required a small upgrade of the 'lockdelay' extension used by
'test-clone.t' because the delay must apply to a single lock only.
author | Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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date | Tue, 23 Aug 2016 23:47:59 +0200 |
parents | 3a2357c31d2a |
children | ad15646dc61c |
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1 """ Mercurial phases support code |
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2 |
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3 --- |
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4 |
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5 Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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6 Logilab SA <contact@logilab.fr> |
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7 Augie Fackler <durin42@gmail.com> |
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8 |
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9 This software may be used and distributed according to the terms |
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10 of the GNU General Public License version 2 or any later version. |
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11 |
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12 --- |
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13 |
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14 This module implements most phase logic in mercurial. |
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15 |
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16 |
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17 Basic Concept |
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18 ============= |
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19 |
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20 A 'changeset phase' is an indicator that tells us how a changeset is |
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21 manipulated and communicated. The details of each phase is described |
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22 below, here we describe the properties they have in common. |
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23 |
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24 Like bookmarks, phases are not stored in history and thus are not |
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25 permanent and leave no audit trail. |
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26 |
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27 First, no changeset can be in two phases at once. Phases are ordered, |
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28 so they can be considered from lowest to highest. The default, lowest |
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29 phase is 'public' - this is the normal phase of existing changesets. A |
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30 child changeset can not be in a lower phase than its parents. |
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31 |
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32 These phases share a hierarchy of traits: |
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33 |
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34 immutable shared |
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35 public: X X |
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36 draft: X |
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37 secret: |
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38 |
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39 Local commits are draft by default. |
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40 |
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41 Phase Movement and Exchange |
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42 =========================== |
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43 |
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44 Phase data is exchanged by pushkey on pull and push. Some servers have |
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45 a publish option set, we call such a server a "publishing server". |
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46 Pushing a draft changeset to a publishing server changes the phase to |
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47 public. |
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48 |
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49 A small list of fact/rules define the exchange of phase: |
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50 |
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51 * old client never changes server states |
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52 * pull never changes server states |
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53 * publish and old server changesets are seen as public by client |
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54 * any secret changeset seen in another repository is lowered to at |
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55 least draft |
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56 |
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57 Here is the final table summing up the 49 possible use cases of phase |
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58 exchange: |
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59 |
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60 server |
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61 old publish non-publish |
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62 N X N D P N D P |
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63 old client |
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64 pull |
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65 N - X/X - X/D X/P - X/D X/P |
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66 X - X/X - X/D X/P - X/D X/P |
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67 push |
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68 X X/X X/X X/P X/P X/P X/D X/D X/P |
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69 new client |
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70 pull |
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71 N - P/X - P/D P/P - D/D P/P |
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72 D - P/X - P/D P/P - D/D P/P |
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73 P - P/X - P/D P/P - P/D P/P |
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74 push |
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75 D P/X P/X P/P P/P P/P D/D D/D P/P |
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76 P P/X P/X P/P P/P P/P P/P P/P P/P |
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77 |
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78 Legend: |
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79 |
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80 A/B = final state on client / state on server |
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81 |
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82 * N = new/not present, |
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83 * P = public, |
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84 * D = draft, |
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85 * X = not tracked (i.e., the old client or server has no internal |
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86 way of recording the phase.) |
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87 |
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88 passive = only pushes |
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89 |
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90 |
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91 A cell here can be read like this: |
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92 |
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93 "When a new client pushes a draft changeset (D) to a publishing |
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94 server where it's not present (N), it's marked public on both |
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95 sides (P/P)." |
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96 |
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97 Note: old client behave as a publishing server with draft only content |
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98 - other people see it as public |
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99 - content is pushed as draft |
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100 |
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101 """ |
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103 from __future__ import absolute_import |
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105 import errno |
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106 import os |
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107 |
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108 from .i18n import _ |
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109 from .node import ( |
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110 bin, |
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111 hex, |
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112 nullid, |
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113 nullrev, |
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114 short, |
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115 ) |
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116 from . import ( |
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117 error, |
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118 ) |
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119 |
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120 allphases = public, draft, secret = range(3) |
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121 trackedphases = allphases[1:] |
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122 phasenames = ['public', 'draft', 'secret'] |
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123 |
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124 def _readroots(repo, phasedefaults=None): |
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125 """Read phase roots from disk |
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126 |
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127 phasedefaults is a list of fn(repo, roots) callable, which are |
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128 executed if the phase roots file does not exist. When phases are |
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129 being initialized on an existing repository, this could be used to |
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130 set selected changesets phase to something else than public. |
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131 |
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132 Return (roots, dirty) where dirty is true if roots differ from |
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133 what is being stored. |
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134 """ |
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135 repo = repo.unfiltered() |
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136 dirty = False |
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137 roots = [set() for i in allphases] |
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138 try: |
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139 f = None |
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140 if 'HG_PENDING' in os.environ: |
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141 try: |
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142 f = repo.svfs('phaseroots.pending') |
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143 except IOError as inst: |
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144 if inst.errno != errno.ENOENT: |
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145 raise |
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146 if f is None: |
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147 f = repo.svfs('phaseroots') |
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148 try: |
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149 for line in f: |
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150 phase, nh = line.split() |
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151 roots[int(phase)].add(bin(nh)) |
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152 finally: |
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153 f.close() |
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154 except IOError as inst: |
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155 if inst.errno != errno.ENOENT: |
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156 raise |
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157 if phasedefaults: |
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158 for f in phasedefaults: |
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159 roots = f(repo, roots) |
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160 dirty = True |
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161 return roots, dirty |
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162 |
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163 class phasecache(object): |
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164 def __init__(self, repo, phasedefaults, _load=True): |
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165 if _load: |
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166 # Cheap trick to allow shallow-copy without copy module |
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167 self.phaseroots, self.dirty = _readroots(repo, phasedefaults) |
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168 self._phaserevs = None |
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169 self._phasesets = None |
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170 self.filterunknown(repo) |
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171 self.opener = repo.svfs |
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172 |
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173 def copy(self): |
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174 # Shallow copy meant to ensure isolation in |
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175 # advance/retractboundary(), nothing more. |
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176 ph = self.__class__(None, None, _load=False) |
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177 ph.phaseroots = self.phaseroots[:] |
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178 ph.dirty = self.dirty |
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179 ph.opener = self.opener |
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180 ph._phaserevs = self._phaserevs |
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181 ph._phasesets = self._phasesets |
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182 return ph |
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183 |
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184 def replace(self, phcache): |
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185 """replace all values in 'self' with content of phcache""" |
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186 for a in ('phaseroots', 'dirty', 'opener', '_phaserevs', '_phasesets'): |
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187 setattr(self, a, getattr(phcache, a)) |
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188 |
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189 def _getphaserevsnative(self, repo): |
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190 repo = repo.unfiltered() |
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191 nativeroots = [] |
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192 for phase in trackedphases: |
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193 nativeroots.append(map(repo.changelog.rev, self.phaseroots[phase])) |
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194 return repo.changelog.computephases(nativeroots) |
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195 |
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196 def _computephaserevspure(self, repo): |
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197 repo = repo.unfiltered() |
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198 revs = [public] * len(repo.changelog) |
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199 self._phaserevs = revs |
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200 self._populatephaseroots(repo) |
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201 for phase in trackedphases: |
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202 roots = map(repo.changelog.rev, self.phaseroots[phase]) |
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203 if roots: |
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204 for rev in roots: |
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205 revs[rev] = phase |
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206 for rev in repo.changelog.descendants(roots): |
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207 revs[rev] = phase |
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208 |
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209 def loadphaserevs(self, repo): |
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210 """ensure phase information is loaded in the object""" |
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211 if self._phaserevs is None: |
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212 try: |
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213 if repo.ui.configbool('experimental', |
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214 'nativephaseskillswitch'): |
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215 self._computephaserevspure(repo) |
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216 else: |
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217 res = self._getphaserevsnative(repo) |
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218 self._phaserevs, self._phasesets = res |
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219 except AttributeError: |
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220 self._computephaserevspure(repo) |
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221 |
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222 def invalidate(self): |
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223 self._phaserevs = None |
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224 self._phasesets = None |
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225 |
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226 def _populatephaseroots(self, repo): |
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227 """Fills the _phaserevs cache with phases for the roots. |
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228 """ |
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229 cl = repo.changelog |
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230 phaserevs = self._phaserevs |
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231 for phase in trackedphases: |
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232 roots = map(cl.rev, self.phaseroots[phase]) |
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233 for root in roots: |
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234 phaserevs[root] = phase |
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235 |
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236 def phase(self, repo, rev): |
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237 # We need a repo argument here to be able to build _phaserevs |
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238 # if necessary. The repository instance is not stored in |
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239 # phasecache to avoid reference cycles. The changelog instance |
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240 # is not stored because it is a filecache() property and can |
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241 # be replaced without us being notified. |
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242 if rev == nullrev: |
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243 return public |
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244 if rev < nullrev: |
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245 raise ValueError(_('cannot lookup negative revision')) |
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246 if self._phaserevs is None or rev >= len(self._phaserevs): |
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247 self.invalidate() |
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248 self.loadphaserevs(repo) |
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249 return self._phaserevs[rev] |
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250 |
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251 def write(self): |
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252 if not self.dirty: |
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253 return |
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254 f = self.opener('phaseroots', 'w', atomictemp=True, checkambig=True) |
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255 try: |
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256 self._write(f) |
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257 finally: |
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258 f.close() |
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259 |
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260 def _write(self, fp): |
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261 for phase, roots in enumerate(self.phaseroots): |
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262 for h in roots: |
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263 fp.write('%i %s\n' % (phase, hex(h))) |
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264 self.dirty = False |
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265 |
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266 def _updateroots(self, phase, newroots, tr): |
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267 self.phaseroots[phase] = newroots |
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268 self.invalidate() |
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269 self.dirty = True |
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270 |
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271 tr.addfilegenerator('phase', ('phaseroots',), self._write) |
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272 tr.hookargs['phases_moved'] = '1' |
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273 |
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274 def advanceboundary(self, repo, tr, targetphase, nodes): |
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275 # Be careful to preserve shallow-copied values: do not update |
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276 # phaseroots values, replace them. |
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277 |
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278 repo = repo.unfiltered() |
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279 delroots = [] # set of root deleted by this path |
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280 for phase in xrange(targetphase + 1, len(allphases)): |
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281 # filter nodes that are not in a compatible phase already |
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282 nodes = [n for n in nodes |
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283 if self.phase(repo, repo[n].rev()) >= phase] |
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284 if not nodes: |
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285 break # no roots to move anymore |
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286 olds = self.phaseroots[phase] |
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287 roots = set(ctx.node() for ctx in repo.set( |
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288 'roots((%ln::) - (%ln::%ln))', olds, olds, nodes)) |
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289 if olds != roots: |
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290 self._updateroots(phase, roots, tr) |
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291 # some roots may need to be declared for lower phases |
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292 delroots.extend(olds - roots) |
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293 # declare deleted root in the target phase |
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294 if targetphase != 0: |
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295 self.retractboundary(repo, tr, targetphase, delroots) |
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296 repo.invalidatevolatilesets() |
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297 |
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298 def retractboundary(self, repo, tr, targetphase, nodes): |
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299 # Be careful to preserve shallow-copied values: do not update |
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300 # phaseroots values, replace them. |
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301 |
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302 repo = repo.unfiltered() |
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303 currentroots = self.phaseroots[targetphase] |
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304 newroots = [n for n in nodes |
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305 if self.phase(repo, repo[n].rev()) < targetphase] |
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306 if newroots: |
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307 if nullid in newroots: |
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308 raise error.Abort(_('cannot change null revision phase')) |
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309 currentroots = currentroots.copy() |
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310 currentroots.update(newroots) |
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311 |
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312 # Only compute new roots for revs above the roots that are being |
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313 # retracted. |
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314 minnewroot = min(repo[n].rev() for n in newroots) |
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315 aboveroots = [n for n in currentroots |
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316 if repo[n].rev() >= minnewroot] |
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317 updatedroots = repo.set('roots(%ln::)', aboveroots) |
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318 |
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319 finalroots = set(n for n in currentroots if repo[n].rev() < |
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320 minnewroot) |
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321 finalroots.update(ctx.node() for ctx in updatedroots) |
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322 |
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323 self._updateroots(targetphase, finalroots, tr) |
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324 repo.invalidatevolatilesets() |
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325 |
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326 def filterunknown(self, repo): |
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327 """remove unknown nodes from the phase boundary |
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328 |
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329 Nothing is lost as unknown nodes only hold data for their descendants. |
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330 """ |
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331 filtered = False |
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332 nodemap = repo.changelog.nodemap # to filter unknown nodes |
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333 for phase, nodes in enumerate(self.phaseroots): |
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334 missing = sorted(node for node in nodes if node not in nodemap) |
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335 if missing: |
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336 for mnode in missing: |
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337 repo.ui.debug( |
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338 'removing unknown node %s from %i-phase boundary\n' |
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339 % (short(mnode), phase)) |
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340 nodes.symmetric_difference_update(missing) |
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341 filtered = True |
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342 if filtered: |
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343 self.dirty = True |
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344 # filterunknown is called by repo.destroyed, we may have no changes in |
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345 # root but phaserevs contents is certainly invalid (or at least we |
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346 # have not proper way to check that). related to issue 3858. |
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347 # |
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348 # The other caller is __init__ that have no _phaserevs initialized |
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349 # anyway. If this change we should consider adding a dedicated |
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350 # "destroyed" function to phasecache or a proper cache key mechanism |
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351 # (see branchmap one) |
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352 self.invalidate() |
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353 |
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354 def advanceboundary(repo, tr, targetphase, nodes): |
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355 """Add nodes to a phase changing other nodes phases if necessary. |
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356 |
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357 This function move boundary *forward* this means that all nodes |
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358 are set in the target phase or kept in a *lower* phase. |
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359 |
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360 Simplify boundary to contains phase roots only.""" |
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361 phcache = repo._phasecache.copy() |
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362 phcache.advanceboundary(repo, tr, targetphase, nodes) |
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363 repo._phasecache.replace(phcache) |
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364 |
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365 def retractboundary(repo, tr, targetphase, nodes): |
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366 """Set nodes back to a phase changing other nodes phases if |
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367 necessary. |
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368 |
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369 This function move boundary *backward* this means that all nodes |
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370 are set in the target phase or kept in a *higher* phase. |
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371 |
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372 Simplify boundary to contains phase roots only.""" |
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373 phcache = repo._phasecache.copy() |
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374 phcache.retractboundary(repo, tr, targetphase, nodes) |
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375 repo._phasecache.replace(phcache) |
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376 |
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377 def listphases(repo): |
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378 """List phases root for serialization over pushkey""" |
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379 keys = {} |
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380 value = '%i' % draft |
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381 for root in repo._phasecache.phaseroots[draft]: |
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382 keys[hex(root)] = value |
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383 |
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384 if repo.publishing(): |
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385 # Add an extra data to let remote know we are a publishing |
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386 # repo. Publishing repo can't just pretend they are old repo. |
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387 # When pushing to a publishing repo, the client still need to |
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388 # push phase boundary |
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389 # |
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390 # Push do not only push changeset. It also push phase data. |
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391 # New phase data may apply to common changeset which won't be |
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392 # push (as they are common). Here is a very simple example: |
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393 # |
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394 # 1) repo A push changeset X as draft to repo B |
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395 # 2) repo B make changeset X public |
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396 # 3) repo B push to repo A. X is not pushed but the data that |
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397 # X as now public should |
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398 # |
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399 # The server can't handle it on it's own as it has no idea of |
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400 # client phase data. |
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401 keys['publishing'] = 'True' |
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402 return keys |
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403 |
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404 def pushphase(repo, nhex, oldphasestr, newphasestr): |
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406 repo = repo.unfiltered() |
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407 with repo.lock(): |
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408 currentphase = repo[nhex].phase() |
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409 newphase = abs(int(newphasestr)) # let's avoid negative index surprise |
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410 oldphase = abs(int(oldphasestr)) # let's avoid negative index surprise |
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411 if currentphase == oldphase and newphase < oldphase: |
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412 with repo.transaction('pushkey-phase') as tr: |
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413 advanceboundary(repo, tr, newphase, [bin(nhex)]) |
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414 return 1 |
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415 elif currentphase == newphase: |
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416 # raced, but got correct result |
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417 return 1 |
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418 else: |
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419 return 0 |
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420 |
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421 def analyzeremotephases(repo, subset, roots): |
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422 """Compute phases heads and root in a subset of node from root dict |
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423 |
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424 * subset is heads of the subset |
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425 * roots is {<nodeid> => phase} mapping. key and value are string. |
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426 |
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427 Accept unknown element input |
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428 """ |
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429 repo = repo.unfiltered() |
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430 # build list from dictionary |
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431 draftroots = [] |
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432 nodemap = repo.changelog.nodemap # to filter unknown nodes |
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433 for nhex, phase in roots.iteritems(): |
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434 if nhex == 'publishing': # ignore data related to publish option |
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435 continue |
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436 node = bin(nhex) |
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437 phase = int(phase) |
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438 if phase == public: |
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439 if node != nullid: |
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440 repo.ui.warn(_('ignoring inconsistent public root' |
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441 ' from remote: %s\n') % nhex) |
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442 elif phase == draft: |
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443 if node in nodemap: |
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444 draftroots.append(node) |
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445 else: |
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446 repo.ui.warn(_('ignoring unexpected root from remote: %i %s\n') |
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447 % (phase, nhex)) |
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phases: add a function to compute heads from root
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448 # compute heads |
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phase: extracts heads computation logics from analyzeremotephases
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449 publicheads = newheads(repo, subset, draftroots) |
15892
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phases: simplify phase exchange and movement over pushkey
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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15821
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450 return publicheads, draftroots |
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451 |
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452 def newheads(repo, heads, roots): |
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453 """compute new head of a subset minus another |
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454 |
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455 * `heads`: define the first subset |
17425
e95ec38f86b0
fix wording and not-completely-trivial spelling errors and bad docstrings
Mads Kiilerich <mads@kiilerich.com>
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17424
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456 * `roots`: define the second we subtract from the first""" |
18002
9bc5873e52af
clfilter: phases logic should be unfiltered
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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17979
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457 repo = repo.unfiltered() |
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458 revset = repo.set('heads((%ln + parents(%ln)) - (%ln::%ln))', |
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459 heads, roots, roots, heads) |
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460 return [c.node() for c in revset] |
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461 |
16030
308406677e9d
phases: allow phase name in phases.new-commit settings
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462 |
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463 def newcommitphase(ui): |
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464 """helper to get the target phase of new commit |
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465 |
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466 Handle all possible values for the phases.new-commit options. |
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467 |
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468 """ |
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469 v = ui.config('phases', 'new-commit', draft) |
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470 try: |
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471 return phasenames.index(v) |
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472 except ValueError: |
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473 try: |
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474 return int(v) |
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475 except ValueError: |
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476 msg = _("phases.new-commit: not a valid phase name ('%s')") |
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477 raise error.ConfigError(msg % v) |
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478 |
17671
fdd0fc046cf1
clfilter: introduce a `hassecret` function
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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17537
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479 def hassecret(repo): |
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480 """utility function that check if a repo have any secret changeset.""" |
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481 return bool(repo._phasecache.phaseroots[2]) |