Mercurial > hg
annotate mercurial/phases.py @ 34065:c6c8a52e28c9
revset: optimize "draft() & ::x" pattern
The `draft() & ::x` type query could be common for selecting one or more
draft feature branches being worked on.
Before this patch, `::x` may travel through the changelog DAG for a long
distance until it gets a smaller revision number than `min(draft())`. It
could be very slow on long changelog with distant (in terms of revision
numbers) drafts.
This patch adds a fast path for this situation, and will stop traveling the
changelog DAG once `::x` hits a non-draft revision.
The fast path also works for `secret()` and `not public()`.
To measure the performance difference, I used drawdag to create a repo that
emulates distant drafts:
DRAFT4
|
DRAFT3 # draft
/
PUBLIC9999 # public
|
PUBLIC9998
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. DRAFT2
. |
. DRAFT1 # draft
| /
PUBLIC0001 # public
And measured the performance using the repo:
(BEFORE)
$ hg perfrevset 'draft() & ::(DRAFT2+DRAFT4)'
! wall 0.017132 comb 0.010000 user 0.010000 sys 0.000000 (best of 156)
$ hg perfrevset 'draft() & ::(all())'
! wall 0.024221 comb 0.030000 user 0.030000 sys 0.000000 (best of 113)
(AFTER)
$ hg perfrevset 'draft() & ::(DRAFT2+DRAFT4)'
! wall 0.000243 comb 0.000000 user 0.000000 sys 0.000000 (best of 9303)
$ hg perfrevset 'draft() & ::(all())'
! wall 0.004319 comb 0.000000 user 0.000000 sys 0.000000 (best of 655)
Differential Revision: https://phab.mercurial-scm.org/D441
author | Jun Wu <quark@fb.com> |
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date | Mon, 28 Aug 2017 14:49:00 -0700 |
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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104 |
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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]) |