Mercurial > hg
annotate mercurial/phases.py @ 33822:42ad7cc645a4
copies: add more details to the documentation of mergecopies()
This documentation is very helpful for any developer to understand what
copytracing is and what the function does. Since this is the main function of
doing copytracing, I have also included bits about copytracing in it.
This additions are picked from a doc by Stash@Fb. So thanks to him.
Differential Revision: https://phab.mercurial-scm.org/D409
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Wed, 16 Aug 2017 00:25:20 +0530 |
parents | 57a017f79e96 |
children | 5779d096a696 |
rev | line source |
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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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102 |
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103 from __future__ import absolute_import |
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105 import errno |
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106 |
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107 from .i18n import _ |
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108 from .node import ( |
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109 bin, |
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110 hex, |
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111 nullid, |
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112 nullrev, |
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113 short, |
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114 ) |
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115 from . import ( |
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116 error, |
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117 smartset, |
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118 txnutil, |
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119 util, |
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120 ) |
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121 |
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122 allphases = public, draft, secret = range(3) |
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123 trackedphases = allphases[1:] |
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124 phasenames = ['public', 'draft', 'secret'] |
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125 |
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126 def _readroots(repo, phasedefaults=None): |
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127 """Read phase roots from disk |
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128 |
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129 phasedefaults is a list of fn(repo, roots) callable, which are |
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130 executed if the phase roots file does not exist. When phases are |
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131 being initialized on an existing repository, this could be used to |
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132 set selected changesets phase to something else than public. |
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133 |
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134 Return (roots, dirty) where dirty is true if roots differ from |
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135 what is being stored. |
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136 """ |
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137 repo = repo.unfiltered() |
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138 dirty = False |
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139 roots = [set() for i in allphases] |
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140 try: |
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141 f, pending = txnutil.trypending(repo.root, repo.svfs, 'phaseroots') |
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142 try: |
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143 for line in f: |
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144 phase, nh = line.split() |
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145 roots[int(phase)].add(bin(nh)) |
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146 finally: |
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147 f.close() |
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148 except IOError as inst: |
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149 if inst.errno != errno.ENOENT: |
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150 raise |
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151 if phasedefaults: |
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152 for f in phasedefaults: |
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153 roots = f(repo, roots) |
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154 dirty = True |
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155 return roots, dirty |
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156 |
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157 def _trackphasechange(data, rev, old, new): |
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158 """add a phase move the <data> dictionnary |
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159 |
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160 If data is None, nothing happens. |
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161 """ |
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162 if data is None: |
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163 return |
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164 existing = data.get(rev) |
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165 if existing is not None: |
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166 old = existing[0] |
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167 data[rev] = (old, new) |
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168 |
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169 class phasecache(object): |
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170 def __init__(self, repo, phasedefaults, _load=True): |
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171 if _load: |
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172 # Cheap trick to allow shallow-copy without copy module |
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173 self.phaseroots, self.dirty = _readroots(repo, phasedefaults) |
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174 self._phaserevs = None |
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175 self._phasesets = None |
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176 self.filterunknown(repo) |
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177 self.opener = repo.svfs |
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178 |
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179 def getrevset(self, repo, phases): |
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180 """return a smartset for the given phases""" |
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181 self.loadphaserevs(repo) # ensure phase's sets are loaded |
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182 |
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183 if self._phasesets and all(self._phasesets[p] is not None |
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184 for p in phases): |
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185 # fast path - use _phasesets |
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186 revs = self._phasesets[phases[0]] |
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187 if len(phases) > 1: |
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188 revs = revs.copy() # only copy when needed |
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189 for p in phases[1:]: |
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190 revs.update(self._phasesets[p]) |
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191 if repo.changelog.filteredrevs: |
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192 revs = revs - repo.changelog.filteredrevs |
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193 return smartset.baseset(revs) |
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194 else: |
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195 # slow path - enumerate all revisions |
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196 phase = self.phase |
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197 revs = (r for r in repo if phase(repo, r) in phases) |
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198 return smartset.generatorset(revs, iterasc=True) |
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199 |
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200 def copy(self): |
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201 # Shallow copy meant to ensure isolation in |
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202 # advance/retractboundary(), nothing more. |
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203 ph = self.__class__(None, None, _load=False) |
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204 ph.phaseroots = self.phaseroots[:] |
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205 ph.dirty = self.dirty |
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206 ph.opener = self.opener |
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207 ph._phaserevs = self._phaserevs |
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208 ph._phasesets = self._phasesets |
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209 return ph |
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210 |
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211 def replace(self, phcache): |
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212 """replace all values in 'self' with content of phcache""" |
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213 for a in ('phaseroots', 'dirty', 'opener', '_phaserevs', '_phasesets'): |
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214 setattr(self, a, getattr(phcache, a)) |
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215 |
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216 def _getphaserevsnative(self, repo): |
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217 repo = repo.unfiltered() |
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218 nativeroots = [] |
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219 for phase in trackedphases: |
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220 nativeroots.append(map(repo.changelog.rev, self.phaseroots[phase])) |
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221 return repo.changelog.computephases(nativeroots) |
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222 |
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223 def _computephaserevspure(self, repo): |
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224 repo = repo.unfiltered() |
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225 revs = [public] * len(repo.changelog) |
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226 self._phaserevs = revs |
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227 self._populatephaseroots(repo) |
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228 for phase in trackedphases: |
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229 roots = list(map(repo.changelog.rev, self.phaseroots[phase])) |
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230 if roots: |
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231 for rev in roots: |
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232 revs[rev] = phase |
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233 for rev in repo.changelog.descendants(roots): |
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234 revs[rev] = phase |
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235 |
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236 def loadphaserevs(self, repo): |
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237 """ensure phase information is loaded in the object""" |
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238 if self._phaserevs is None: |
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239 try: |
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240 res = self._getphaserevsnative(repo) |
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241 self._phaserevs, self._phasesets = res |
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242 except AttributeError: |
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243 self._computephaserevspure(repo) |
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244 |
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245 def invalidate(self): |
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246 self._phaserevs = None |
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247 self._phasesets = None |
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248 |
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249 def _populatephaseroots(self, repo): |
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250 """Fills the _phaserevs cache with phases for the roots. |
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251 """ |
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252 cl = repo.changelog |
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253 phaserevs = self._phaserevs |
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254 for phase in trackedphases: |
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255 roots = map(cl.rev, self.phaseroots[phase]) |
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256 for root in roots: |
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257 phaserevs[root] = phase |
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258 |
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259 def phase(self, repo, rev): |
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260 # We need a repo argument here to be able to build _phaserevs |
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261 # if necessary. The repository instance is not stored in |
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262 # phasecache to avoid reference cycles. The changelog instance |
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263 # is not stored because it is a filecache() property and can |
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264 # be replaced without us being notified. |
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265 if rev == nullrev: |
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266 return public |
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267 if rev < nullrev: |
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268 raise ValueError(_('cannot lookup negative revision')) |
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269 if self._phaserevs is None or rev >= len(self._phaserevs): |
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270 self.invalidate() |
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271 self.loadphaserevs(repo) |
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272 return self._phaserevs[rev] |
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273 |
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274 def write(self): |
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275 if not self.dirty: |
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276 return |
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277 f = self.opener('phaseroots', 'w', atomictemp=True, checkambig=True) |
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278 try: |
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279 self._write(f) |
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280 finally: |
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281 f.close() |
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282 |
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283 def _write(self, fp): |
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284 for phase, roots in enumerate(self.phaseroots): |
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285 for h in roots: |
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286 fp.write('%i %s\n' % (phase, hex(h))) |
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287 self.dirty = False |
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288 |
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289 def _updateroots(self, phase, newroots, tr): |
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290 self.phaseroots[phase] = newroots |
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291 self.invalidate() |
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292 self.dirty = True |
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293 |
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294 tr.addfilegenerator('phase', ('phaseroots',), self._write) |
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295 tr.hookargs['phases_moved'] = '1' |
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296 |
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297 def registernew(self, repo, tr, targetphase, nodes): |
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298 repo = repo.unfiltered() |
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299 self._retractboundary(repo, tr, targetphase, nodes) |
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300 if tr is not None and 'phases' in tr.changes: |
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301 phasetracking = tr.changes['phases'] |
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302 torev = repo.changelog.rev |
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303 phase = self.phase |
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304 for n in nodes: |
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305 rev = torev(n) |
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306 revphase = phase(repo, rev) |
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307 _trackphasechange(phasetracking, rev, None, revphase) |
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308 repo.invalidatevolatilesets() |
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309 |
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310 def advanceboundary(self, repo, tr, targetphase, nodes): |
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311 """Set all 'nodes' to phase 'targetphase' |
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312 |
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313 Nodes with a phase lower than 'targetphase' are not affected. |
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314 """ |
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315 # Be careful to preserve shallow-copied values: do not update |
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316 # phaseroots values, replace them. |
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317 if tr is None: |
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318 phasetracking = None |
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319 else: |
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320 phasetracking = tr.changes.get('phases') |
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321 |
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322 repo = repo.unfiltered() |
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323 |
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324 delroots = [] # set of root deleted by this path |
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325 for phase in xrange(targetphase + 1, len(allphases)): |
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326 # filter nodes that are not in a compatible phase already |
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327 nodes = [n for n in nodes |
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328 if self.phase(repo, repo[n].rev()) >= phase] |
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329 if not nodes: |
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330 break # no roots to move anymore |
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331 |
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332 olds = self.phaseroots[phase] |
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333 |
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334 affected = repo.revs('%ln::%ln', olds, nodes) |
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335 for r in affected: |
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336 _trackphasechange(phasetracking, r, self.phase(repo, r), |
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337 targetphase) |
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338 |
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339 roots = set(ctx.node() for ctx in repo.set( |
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340 'roots((%ln::) - %ld)', olds, affected)) |
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341 if olds != roots: |
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342 self._updateroots(phase, roots, tr) |
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343 # some roots may need to be declared for lower phases |
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344 delroots.extend(olds - roots) |
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345 # declare deleted root in the target phase |
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346 if targetphase != 0: |
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347 self._retractboundary(repo, tr, targetphase, delroots) |
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348 repo.invalidatevolatilesets() |
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349 |
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350 def retractboundary(self, repo, tr, targetphase, nodes): |
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351 oldroots = self.phaseroots[:targetphase + 1] |
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352 if tr is None: |
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353 phasetracking = None |
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354 else: |
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355 phasetracking = tr.changes.get('phases') |
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356 repo = repo.unfiltered() |
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357 if (self._retractboundary(repo, tr, targetphase, nodes) |
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358 and phasetracking is not None): |
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359 |
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360 # find the affected revisions |
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361 new = self.phaseroots[targetphase] |
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362 old = oldroots[targetphase] |
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363 affected = set(repo.revs('(%ln::) - (%ln::)', new, old)) |
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364 |
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365 # find the phase of the affected revision |
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366 for phase in xrange(targetphase, -1, -1): |
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367 if phase: |
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368 roots = oldroots[phase] |
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369 revs = set(repo.revs('%ln::%ld', roots, affected)) |
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370 affected -= revs |
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371 else: # public phase |
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372 revs = affected |
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373 for r in revs: |
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374 _trackphasechange(phasetracking, r, phase, targetphase) |
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375 repo.invalidatevolatilesets() |
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376 |
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377 def _retractboundary(self, repo, tr, targetphase, nodes): |
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378 # Be careful to preserve shallow-copied values: do not update |
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379 # phaseroots values, replace them. |
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380 |
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381 repo = repo.unfiltered() |
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382 currentroots = self.phaseroots[targetphase] |
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383 finalroots = oldroots = set(currentroots) |
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384 newroots = [n for n in nodes |
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385 if self.phase(repo, repo[n].rev()) < targetphase] |
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386 if newroots: |
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387 |
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388 if nullid in newroots: |
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389 raise error.Abort(_('cannot change null revision phase')) |
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390 currentroots = currentroots.copy() |
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391 currentroots.update(newroots) |
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392 |
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393 # Only compute new roots for revs above the roots that are being |
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394 # retracted. |
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395 minnewroot = min(repo[n].rev() for n in newroots) |
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396 aboveroots = [n for n in currentroots |
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397 if repo[n].rev() >= minnewroot] |
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398 updatedroots = repo.set('roots(%ln::)', aboveroots) |
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399 |
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400 finalroots = set(n for n in currentroots if repo[n].rev() < |
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401 minnewroot) |
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402 finalroots.update(ctx.node() for ctx in updatedroots) |
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403 if finalroots != oldroots: |
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404 self._updateroots(targetphase, finalroots, tr) |
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405 return True |
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406 return False |
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407 |
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408 def filterunknown(self, repo): |
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409 """remove unknown nodes from the phase boundary |
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410 |
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411 Nothing is lost as unknown nodes only hold data for their descendants. |
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412 """ |
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413 filtered = False |
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414 nodemap = repo.changelog.nodemap # to filter unknown nodes |
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415 for phase, nodes in enumerate(self.phaseroots): |
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416 missing = sorted(node for node in nodes if node not in nodemap) |
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417 if missing: |
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418 for mnode in missing: |
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419 repo.ui.debug( |
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420 'removing unknown node %s from %i-phase boundary\n' |
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421 % (short(mnode), phase)) |
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422 nodes.symmetric_difference_update(missing) |
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423 filtered = True |
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424 if filtered: |
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425 self.dirty = True |
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426 # filterunknown is called by repo.destroyed, we may have no changes in |
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427 # root but phaserevs contents is certainly invalid (or at least we |
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428 # have not proper way to check that). related to issue 3858. |
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429 # |
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430 # The other caller is __init__ that have no _phaserevs initialized |
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431 # anyway. If this change we should consider adding a dedicated |
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432 # "destroyed" function to phasecache or a proper cache key mechanism |
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433 # (see branchmap one) |
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434 self.invalidate() |
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435 |
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436 def advanceboundary(repo, tr, targetphase, nodes): |
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437 """Add nodes to a phase changing other nodes phases if necessary. |
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438 |
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439 This function move boundary *forward* this means that all nodes |
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440 are set in the target phase or kept in a *lower* phase. |
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441 |
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442 Simplify boundary to contains phase roots only.""" |
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443 phcache = repo._phasecache.copy() |
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444 phcache.advanceboundary(repo, tr, targetphase, nodes) |
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445 repo._phasecache.replace(phcache) |
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446 |
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447 def retractboundary(repo, tr, targetphase, nodes): |
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448 """Set nodes back to a phase changing other nodes phases if |
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449 necessary. |
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450 |
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451 This function move boundary *backward* this means that all nodes |
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452 are set in the target phase or kept in a *higher* phase. |
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453 |
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454 Simplify boundary to contains phase roots only.""" |
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455 phcache = repo._phasecache.copy() |
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456 phcache.retractboundary(repo, tr, targetphase, nodes) |
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457 repo._phasecache.replace(phcache) |
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458 |
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459 def registernew(repo, tr, targetphase, nodes): |
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460 """register a new revision and its phase |
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461 |
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462 Code adding revisions to the repository should use this function to |
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463 set new changeset in their target phase (or higher). |
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464 """ |
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465 phcache = repo._phasecache.copy() |
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466 phcache.registernew(repo, tr, targetphase, nodes) |
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467 repo._phasecache.replace(phcache) |
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468 |
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469 def listphases(repo): |
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470 """List phases root for serialization over pushkey""" |
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471 # Use ordered dictionary so behavior is deterministic. |
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472 keys = util.sortdict() |
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473 value = '%i' % draft |
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474 for root in repo._phasecache.phaseroots[draft]: |
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475 keys[hex(root)] = value |
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476 |
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477 if repo.publishing(): |
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478 # Add an extra data to let remote know we are a publishing |
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479 # repo. Publishing repo can't just pretend they are old repo. |
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480 # When pushing to a publishing repo, the client still need to |
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481 # push phase boundary |
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482 # |
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483 # Push do not only push changeset. It also push phase data. |
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484 # New phase data may apply to common changeset which won't be |
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485 # push (as they are common). Here is a very simple example: |
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486 # |
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487 # 1) repo A push changeset X as draft to repo B |
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488 # 2) repo B make changeset X public |
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489 # 3) repo B push to repo A. X is not pushed but the data that |
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490 # X as now public should |
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491 # |
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492 # The server can't handle it on it's own as it has no idea of |
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493 # client phase data. |
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494 keys['publishing'] = 'True' |
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495 return keys |
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496 |
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497 def pushphase(repo, nhex, oldphasestr, newphasestr): |
17535 | 498 """List phases root for serialization over pushkey""" |
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499 repo = repo.unfiltered() |
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500 with repo.lock(): |
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501 currentphase = repo[nhex].phase() |
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502 newphase = abs(int(newphasestr)) # let's avoid negative index surprise |
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503 oldphase = abs(int(oldphasestr)) # let's avoid negative index surprise |
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504 if currentphase == oldphase and newphase < oldphase: |
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505 with repo.transaction('pushkey-phase') as tr: |
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506 advanceboundary(repo, tr, newphase, [bin(nhex)]) |
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507 return True |
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508 elif currentphase == newphase: |
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509 # raced, but got correct result |
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510 return True |
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511 else: |
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512 return False |
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513 |
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514 def subsetphaseheads(repo, subset): |
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515 """Finds the phase heads for a subset of a history |
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516 |
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517 Returns a list indexed by phase number where each item is a list of phase |
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518 head nodes. |
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519 """ |
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520 cl = repo.changelog |
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521 |
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522 headsbyphase = [[] for i in allphases] |
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523 # No need to keep track of secret phase; any heads in the subset that |
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524 # are not mentioned are implicitly secret. |
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525 for phase in allphases[:-1]: |
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526 revset = "heads(%%ln & %s())" % phasenames[phase] |
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527 headsbyphase[phase] = [cl.node(r) for r in repo.revs(revset, subset)] |
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528 return headsbyphase |
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529 |
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530 def updatephases(repo, tr, headsbyphase): |
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531 """Updates the repo with the given phase heads""" |
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532 # Now advance phase boundaries of all but secret phase |
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533 for phase in allphases[:-1]: |
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534 advanceboundary(repo, tr, phase, headsbyphase[phase]) |
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535 |
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536 def analyzeremotephases(repo, subset, roots): |
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537 """Compute phases heads and root in a subset of node from root dict |
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538 |
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539 * subset is heads of the subset |
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540 * roots is {<nodeid> => phase} mapping. key and value are string. |
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541 |
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542 Accept unknown element input |
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543 """ |
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544 repo = repo.unfiltered() |
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545 # build list from dictionary |
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546 draftroots = [] |
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547 nodemap = repo.changelog.nodemap # to filter unknown nodes |
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548 for nhex, phase in roots.iteritems(): |
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549 if nhex == 'publishing': # ignore data related to publish option |
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550 continue |
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551 node = bin(nhex) |
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552 phase = int(phase) |
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553 if phase == public: |
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554 if node != nullid: |
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555 repo.ui.warn(_('ignoring inconsistent public root' |
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556 ' from remote: %s\n') % nhex) |
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557 elif phase == draft: |
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558 if node in nodemap: |
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559 draftroots.append(node) |
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560 else: |
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561 repo.ui.warn(_('ignoring unexpected root from remote: %i %s\n') |
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562 % (phase, nhex)) |
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563 # compute heads |
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564 publicheads = newheads(repo, subset, draftroots) |
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565 return publicheads, draftroots |
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566 |
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567 def newheads(repo, heads, roots): |
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568 """compute new head of a subset minus another |
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569 |
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570 * `heads`: define the first subset |
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571 * `roots`: define the second we subtract from the first""" |
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572 repo = repo.unfiltered() |
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573 revset = repo.set('heads((%ln + parents(%ln)) - (%ln::%ln))', |
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574 heads, roots, roots, heads) |
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575 return [c.node() for c in revset] |
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576 |
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577 |
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578 def newcommitphase(ui): |
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579 """helper to get the target phase of new commit |
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580 |
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581 Handle all possible values for the phases.new-commit options. |
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582 |
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583 """ |
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584 v = ui.config('phases', 'new-commit', draft) |
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585 try: |
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586 return phasenames.index(v) |
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587 except ValueError: |
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588 try: |
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589 return int(v) |
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590 except ValueError: |
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591 msg = _("phases.new-commit: not a valid phase name ('%s')") |
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592 raise error.ConfigError(msg % v) |
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593 |
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594 def hassecret(repo): |
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595 """utility function that check if a repo have any secret changeset.""" |
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596 return bool(repo._phasecache.phaseroots[2]) |