Mercurial > hg
annotate hgext/narrow/narrowbundle2.py @ 38790:3e7387337a3c
exchange: move narrow acl functionality into core
This function is called by the custom changegroup generation code
in the narrow extension. I want to move that changegroup code into
core. That means we need to move this function.
The code is kinda hacky in that assumes existence of REMOTE_USER,
which is only present on authenticated HTTP requests. I've added
a comment indicating that.
Differential Revision: https://phab.mercurial-scm.org/D4008
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 02 Jul 2018 18:24:26 -0700 |
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children | 7e66e7999bdd |
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1 # narrowbundle2.py - bundle2 extensions for narrow repository support |
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2 # |
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3 # Copyright 2017 Google, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import errno |
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12 import struct |
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13 |
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14 from mercurial.i18n import _ |
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15 from mercurial.node import ( |
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16 bin, |
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17 nullid, |
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18 nullrev, |
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19 ) |
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20 from mercurial import ( |
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21 bundle2, |
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22 changegroup, |
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23 dagutil, |
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24 error, |
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25 exchange, |
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26 extensions, |
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27 narrowspec, |
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28 repair, |
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29 util, |
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30 wireprototypes, |
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31 ) |
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32 from mercurial.utils import ( |
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33 stringutil, |
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34 ) |
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35 |
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36 NARROWCAP = 'narrow' |
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37 _NARROWACL_SECTION = 'narrowhgacl' |
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38 _CHANGESPECPART = NARROWCAP + ':changespec' |
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39 _SPECPART = NARROWCAP + ':spec' |
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40 _SPECPART_INCLUDE = 'include' |
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41 _SPECPART_EXCLUDE = 'exclude' |
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42 _KILLNODESIGNAL = 'KILL' |
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43 _DONESIGNAL = 'DONE' |
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44 _ELIDEDCSHEADER = '>20s20s20sl' # cset id, p1, p2, len(text) |
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45 _ELIDEDMFHEADER = '>20s20s20s20sl' # manifest id, p1, p2, link id, len(text) |
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46 _CSHEADERSIZE = struct.calcsize(_ELIDEDCSHEADER) |
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47 _MFHEADERSIZE = struct.calcsize(_ELIDEDMFHEADER) |
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48 |
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49 # When advertising capabilities, always include narrow clone support. |
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50 def getrepocaps_narrow(orig, repo, **kwargs): |
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51 caps = orig(repo, **kwargs) |
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52 caps[NARROWCAP] = ['v0'] |
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53 return caps |
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54 |
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55 def _computeellipsis(repo, common, heads, known, match, depth=None): |
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56 """Compute the shape of a narrowed DAG. |
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57 |
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58 Args: |
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59 repo: The repository we're transferring. |
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60 common: The roots of the DAG range we're transferring. |
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61 May be just [nullid], which means all ancestors of heads. |
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62 heads: The heads of the DAG range we're transferring. |
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63 match: The narrowmatcher that allows us to identify relevant changes. |
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64 depth: If not None, only consider nodes to be full nodes if they are at |
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65 most depth changesets away from one of heads. |
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66 |
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67 Returns: |
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68 A tuple of (visitnodes, relevant_nodes, ellipsisroots) where: |
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69 |
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70 visitnodes: The list of nodes (either full or ellipsis) which |
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71 need to be sent to the client. |
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72 relevant_nodes: The set of changelog nodes which change a file inside |
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73 the narrowspec. The client needs these as non-ellipsis nodes. |
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74 ellipsisroots: A dict of {rev: parents} that is used in |
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75 narrowchangegroup to produce ellipsis nodes with the |
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76 correct parents. |
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77 """ |
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78 cl = repo.changelog |
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79 mfl = repo.manifestlog |
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80 |
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81 cldag = dagutil.revlogdag(cl) |
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82 # dagutil does not like nullid/nullrev |
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83 commonrevs = cldag.internalizeall(common - set([nullid])) | set([nullrev]) |
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84 headsrevs = cldag.internalizeall(heads) |
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85 if depth: |
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86 revdepth = {h: 0 for h in headsrevs} |
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87 |
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88 ellipsisheads = collections.defaultdict(set) |
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89 ellipsisroots = collections.defaultdict(set) |
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90 |
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91 def addroot(head, curchange): |
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92 """Add a root to an ellipsis head, splitting heads with 3 roots.""" |
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93 ellipsisroots[head].add(curchange) |
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94 # Recursively split ellipsis heads with 3 roots by finding the |
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95 # roots' youngest common descendant which is an elided merge commit. |
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96 # That descendant takes 2 of the 3 roots as its own, and becomes a |
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97 # root of the head. |
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98 while len(ellipsisroots[head]) > 2: |
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99 child, roots = splithead(head) |
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100 splitroots(head, child, roots) |
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101 head = child # Recurse in case we just added a 3rd root |
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102 |
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103 def splitroots(head, child, roots): |
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104 ellipsisroots[head].difference_update(roots) |
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105 ellipsisroots[head].add(child) |
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106 ellipsisroots[child].update(roots) |
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107 ellipsisroots[child].discard(child) |
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108 |
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109 def splithead(head): |
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110 r1, r2, r3 = sorted(ellipsisroots[head]) |
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111 for nr1, nr2 in ((r2, r3), (r1, r3), (r1, r2)): |
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112 mid = repo.revs('sort(merge() & %d::%d & %d::%d, -rev)', |
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113 nr1, head, nr2, head) |
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114 for j in mid: |
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115 if j == nr2: |
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116 return nr2, (nr1, nr2) |
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117 if j not in ellipsisroots or len(ellipsisroots[j]) < 2: |
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118 return j, (nr1, nr2) |
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119 raise error.Abort('Failed to split up ellipsis node! head: %d, ' |
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120 'roots: %d %d %d' % (head, r1, r2, r3)) |
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121 |
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122 missing = list(cl.findmissingrevs(common=commonrevs, heads=headsrevs)) |
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123 visit = reversed(missing) |
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124 relevant_nodes = set() |
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125 visitnodes = [cl.node(m) for m in missing] |
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126 required = set(headsrevs) | known |
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127 for rev in visit: |
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128 clrev = cl.changelogrevision(rev) |
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129 ps = cldag.parents(rev) |
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130 if depth is not None: |
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131 curdepth = revdepth[rev] |
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132 for p in ps: |
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133 revdepth[p] = min(curdepth + 1, revdepth.get(p, depth + 1)) |
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134 needed = False |
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135 shallow_enough = depth is None or revdepth[rev] <= depth |
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136 if shallow_enough: |
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137 curmf = mfl[clrev.manifest].read() |
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138 if ps: |
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139 # We choose to not trust the changed files list in |
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140 # changesets because it's not always correct. TODO: could |
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141 # we trust it for the non-merge case? |
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142 p1mf = mfl[cl.changelogrevision(ps[0]).manifest].read() |
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143 needed = bool(curmf.diff(p1mf, match)) |
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144 if not needed and len(ps) > 1: |
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145 # For merge changes, the list of changed files is not |
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146 # helpful, since we need to emit the merge if a file |
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147 # in the narrow spec has changed on either side of the |
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148 # merge. As a result, we do a manifest diff to check. |
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149 p2mf = mfl[cl.changelogrevision(ps[1]).manifest].read() |
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150 needed = bool(curmf.diff(p2mf, match)) |
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151 else: |
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152 # For a root node, we need to include the node if any |
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153 # files in the node match the narrowspec. |
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154 needed = any(curmf.walk(match)) |
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155 |
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156 if needed: |
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157 for head in ellipsisheads[rev]: |
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158 addroot(head, rev) |
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159 for p in ps: |
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160 required.add(p) |
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161 relevant_nodes.add(cl.node(rev)) |
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162 else: |
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163 if not ps: |
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164 ps = [nullrev] |
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165 if rev in required: |
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166 for head in ellipsisheads[rev]: |
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167 addroot(head, rev) |
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168 for p in ps: |
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169 ellipsisheads[p].add(rev) |
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170 else: |
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171 for p in ps: |
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172 ellipsisheads[p] |= ellipsisheads[rev] |
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173 |
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174 # add common changesets as roots of their reachable ellipsis heads |
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175 for c in commonrevs: |
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176 for head in ellipsisheads[c]: |
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177 addroot(head, c) |
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178 return visitnodes, relevant_nodes, ellipsisroots |
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179 |
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180 def _packellipsischangegroup(repo, common, match, relevant_nodes, |
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181 ellipsisroots, visitnodes, depth, source, version): |
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182 if version in ('01', '02'): |
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183 raise error.Abort( |
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184 'ellipsis nodes require at least cg3 on client and server, ' |
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185 'but negotiated version %s' % version) |
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186 # We wrap cg1packer.revchunk, using a side channel to pass |
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187 # relevant_nodes into that area. Then if linknode isn't in the |
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188 # set, we know we have an ellipsis node and we should defer |
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189 # sending that node's data. We override close() to detect |
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190 # pending ellipsis nodes and flush them. |
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191 packer = changegroup.getbundler(version, repo) |
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192 # Let the packer have access to the narrow matcher so it can |
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193 # omit filelogs and dirlogs as needed |
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194 packer._narrow_matcher = lambda : match |
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195 # Give the packer the list of nodes which should not be |
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196 # ellipsis nodes. We store this rather than the set of nodes |
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197 # that should be an ellipsis because for very large histories |
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198 # we expect this to be significantly smaller. |
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199 packer.full_nodes = relevant_nodes |
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200 # Maps ellipsis revs to their roots at the changelog level. |
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201 packer.precomputed_ellipsis = ellipsisroots |
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202 # Maps CL revs to per-revlog revisions. Cleared in close() at |
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203 # the end of each group. |
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204 packer.clrev_to_localrev = {} |
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205 packer.next_clrev_to_localrev = {} |
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206 # Maps changelog nodes to changelog revs. Filled in once |
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207 # during changelog stage and then left unmodified. |
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208 packer.clnode_to_rev = {} |
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209 packer.changelog_done = False |
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210 # If true, informs the packer that it is serving shallow content and might |
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211 # need to pack file contents not introduced by the changes being packed. |
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212 packer.is_shallow = depth is not None |
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213 |
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214 return packer.generate(common, visitnodes, False, source) |
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215 |
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216 # Serve a changegroup for a client with a narrow clone. |
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217 def getbundlechangegrouppart_narrow(bundler, repo, source, |
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218 bundlecaps=None, b2caps=None, heads=None, |
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219 common=None, **kwargs): |
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220 cgversions = b2caps.get('changegroup') |
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221 if cgversions: # 3.1 and 3.2 ship with an empty value |
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222 cgversions = [v for v in cgversions |
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223 if v in changegroup.supportedoutgoingversions(repo)] |
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224 if not cgversions: |
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225 raise ValueError(_('no common changegroup version')) |
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226 version = max(cgversions) |
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227 else: |
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228 raise ValueError(_("server does not advertise changegroup version," |
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229 " can't negotiate support for ellipsis nodes")) |
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230 |
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231 include = sorted(filter(bool, kwargs.get(r'includepats', []))) |
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232 exclude = sorted(filter(bool, kwargs.get(r'excludepats', []))) |
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233 newmatch = narrowspec.match(repo.root, include=include, exclude=exclude) |
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234 if not repo.ui.configbool("experimental", "narrowservebrokenellipses"): |
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235 outgoing = exchange._computeoutgoing(repo, heads, common) |
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236 if not outgoing.missing: |
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237 return |
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238 def wrappedgetbundler(orig, *args, **kwargs): |
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239 bundler = orig(*args, **kwargs) |
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240 bundler._narrow_matcher = lambda : newmatch |
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241 return bundler |
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242 with extensions.wrappedfunction(changegroup, 'getbundler', |
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243 wrappedgetbundler): |
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244 cg = changegroup.makestream(repo, outgoing, version, source) |
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245 part = bundler.newpart('changegroup', data=cg) |
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246 part.addparam('version', version) |
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247 if 'treemanifest' in repo.requirements: |
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248 part.addparam('treemanifest', '1') |
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249 |
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250 if include or exclude: |
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251 narrowspecpart = bundler.newpart(_SPECPART) |
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252 if include: |
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253 narrowspecpart.addparam( |
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254 _SPECPART_INCLUDE, '\n'.join(include), mandatory=True) |
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255 if exclude: |
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256 narrowspecpart.addparam( |
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257 _SPECPART_EXCLUDE, '\n'.join(exclude), mandatory=True) |
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258 |
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259 return |
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260 |
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261 depth = kwargs.get(r'depth', None) |
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262 if depth is not None: |
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263 depth = int(depth) |
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264 if depth < 1: |
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265 raise error.Abort(_('depth must be positive, got %d') % depth) |
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266 |
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267 heads = set(heads or repo.heads()) |
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268 common = set(common or [nullid]) |
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269 oldinclude = sorted(filter(bool, kwargs.get(r'oldincludepats', []))) |
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270 oldexclude = sorted(filter(bool, kwargs.get(r'oldexcludepats', []))) |
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271 known = {bin(n) for n in kwargs.get(r'known', [])} |
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272 if known and (oldinclude != include or oldexclude != exclude): |
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273 # Steps: |
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274 # 1. Send kill for "$known & ::common" |
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275 # |
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276 # 2. Send changegroup for ::common |
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277 # |
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278 # 3. Proceed. |
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279 # |
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280 # In the future, we can send kills for only the specific |
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281 # nodes we know should go away or change shape, and then |
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282 # send a data stream that tells the client something like this: |
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283 # |
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284 # a) apply this changegroup |
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285 # b) apply nodes XXX, YYY, ZZZ that you already have |
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286 # c) goto a |
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287 # |
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288 # until they've built up the full new state. |
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289 # Convert to revnums and intersect with "common". The client should |
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290 # have made it a subset of "common" already, but let's be safe. |
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291 known = set(repo.revs("%ln & ::%ln", known, common)) |
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292 # TODO: we could send only roots() of this set, and the |
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293 # list of nodes in common, and the client could work out |
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294 # what to strip, instead of us explicitly sending every |
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295 # single node. |
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296 deadrevs = known |
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297 def genkills(): |
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298 for r in deadrevs: |
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299 yield _KILLNODESIGNAL |
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300 yield repo.changelog.node(r) |
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301 yield _DONESIGNAL |
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302 bundler.newpart(_CHANGESPECPART, data=genkills()) |
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303 newvisit, newfull, newellipsis = _computeellipsis( |
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304 repo, set(), common, known, newmatch) |
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305 if newvisit: |
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306 cg = _packellipsischangegroup( |
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307 repo, common, newmatch, newfull, newellipsis, |
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308 newvisit, depth, source, version) |
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309 part = bundler.newpart('changegroup', data=cg) |
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310 part.addparam('version', version) |
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311 if 'treemanifest' in repo.requirements: |
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312 part.addparam('treemanifest', '1') |
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313 |
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314 visitnodes, relevant_nodes, ellipsisroots = _computeellipsis( |
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315 repo, common, heads, set(), newmatch, depth=depth) |
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316 |
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317 repo.ui.debug('Found %d relevant revs\n' % len(relevant_nodes)) |
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318 if visitnodes: |
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319 cg = _packellipsischangegroup( |
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320 repo, common, newmatch, relevant_nodes, ellipsisroots, |
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321 visitnodes, depth, source, version) |
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322 part = bundler.newpart('changegroup', data=cg) |
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323 part.addparam('version', version) |
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324 if 'treemanifest' in repo.requirements: |
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325 part.addparam('treemanifest', '1') |
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326 |
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327 @bundle2.parthandler(_SPECPART, (_SPECPART_INCLUDE, _SPECPART_EXCLUDE)) |
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328 def _handlechangespec_2(op, inpart): |
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329 includepats = set(inpart.params.get(_SPECPART_INCLUDE, '').splitlines()) |
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330 excludepats = set(inpart.params.get(_SPECPART_EXCLUDE, '').splitlines()) |
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331 if not changegroup.NARROW_REQUIREMENT in op.repo.requirements: |
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332 op.repo.requirements.add(changegroup.NARROW_REQUIREMENT) |
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333 op.repo._writerequirements() |
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334 op.repo.setnarrowpats(includepats, excludepats) |
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335 |
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336 @bundle2.parthandler(_CHANGESPECPART) |
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337 def _handlechangespec(op, inpart): |
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338 repo = op.repo |
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339 cl = repo.changelog |
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340 |
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341 # changesets which need to be stripped entirely. either they're no longer |
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342 # needed in the new narrow spec, or the server is sending a replacement |
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343 # in the changegroup part. |
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344 clkills = set() |
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345 |
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346 # A changespec part contains all the updates to ellipsis nodes |
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347 # that will happen as a result of widening or narrowing a |
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348 # repo. All the changes that this block encounters are ellipsis |
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349 # nodes or flags to kill an existing ellipsis. |
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350 chunksignal = changegroup.readexactly(inpart, 4) |
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351 while chunksignal != _DONESIGNAL: |
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352 if chunksignal == _KILLNODESIGNAL: |
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353 # a node used to be an ellipsis but isn't anymore |
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354 ck = changegroup.readexactly(inpart, 20) |
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355 if cl.hasnode(ck): |
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356 clkills.add(ck) |
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357 else: |
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358 raise error.Abort( |
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359 _('unexpected changespec node chunk type: %s') % chunksignal) |
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360 chunksignal = changegroup.readexactly(inpart, 4) |
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361 |
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362 if clkills: |
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363 # preserve bookmarks that repair.strip() would otherwise strip |
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364 bmstore = repo._bookmarks |
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365 class dummybmstore(dict): |
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366 def applychanges(self, repo, tr, changes): |
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367 pass |
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368 def recordchange(self, tr): # legacy version |
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369 pass |
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370 repo._bookmarks = dummybmstore() |
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371 chgrpfile = repair.strip(op.ui, repo, list(clkills), backup=True, |
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372 topic='widen') |
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373 repo._bookmarks = bmstore |
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374 if chgrpfile: |
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375 op._widen_uninterr = repo.ui.uninterruptable() |
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376 op._widen_uninterr.__enter__() |
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377 # presence of _widen_bundle attribute activates widen handler later |
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378 op._widen_bundle = chgrpfile |
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379 # Set the new narrowspec if we're widening. The setnewnarrowpats() method |
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380 # will currently always be there when using the core+narrowhg server, but |
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381 # other servers may include a changespec part even when not widening (e.g. |
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382 # because we're deepening a shallow repo). |
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383 if util.safehasattr(repo, 'setnewnarrowpats'): |
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384 repo.setnewnarrowpats() |
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385 |
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386 def handlechangegroup_widen(op, inpart): |
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387 """Changegroup exchange handler which restores temporarily-stripped nodes""" |
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388 # We saved a bundle with stripped node data we must now restore. |
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389 # This approach is based on mercurial/repair.py@6ee26a53c111. |
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390 repo = op.repo |
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391 ui = op.ui |
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392 |
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393 chgrpfile = op._widen_bundle |
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394 del op._widen_bundle |
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395 vfs = repo.vfs |
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396 |
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397 ui.note(_("adding branch\n")) |
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398 f = vfs.open(chgrpfile, "rb") |
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399 try: |
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400 gen = exchange.readbundle(ui, f, chgrpfile, vfs) |
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401 if not ui.verbose: |
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402 # silence internal shuffling chatter |
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403 ui.pushbuffer() |
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404 if isinstance(gen, bundle2.unbundle20): |
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405 with repo.transaction('strip') as tr: |
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406 bundle2.processbundle(repo, gen, lambda: tr) |
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407 else: |
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408 gen.apply(repo, 'strip', 'bundle:' + vfs.join(chgrpfile), True) |
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409 if not ui.verbose: |
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410 ui.popbuffer() |
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411 finally: |
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412 f.close() |
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413 |
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414 # remove undo files |
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415 for undovfs, undofile in repo.undofiles(): |
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416 try: |
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417 undovfs.unlink(undofile) |
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418 except OSError as e: |
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419 if e.errno != errno.ENOENT: |
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420 ui.warn(_('error removing %s: %s\n') % |
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421 (undovfs.join(undofile), stringutil.forcebytestr(e))) |
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422 |
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423 # Remove partial backup only if there were no exceptions |
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424 op._widen_uninterr.__exit__(None, None, None) |
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425 vfs.unlink(chgrpfile) |
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426 |
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427 def setup(): |
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428 """Enable narrow repo support in bundle2-related extension points.""" |
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429 extensions.wrapfunction(bundle2, 'getrepocaps', getrepocaps_narrow) |
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430 |
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431 getbundleargs = wireprototypes.GETBUNDLE_ARGUMENTS |
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432 |
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433 getbundleargs['narrow'] = 'boolean' |
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434 getbundleargs['depth'] = 'plain' |
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435 getbundleargs['oldincludepats'] = 'csv' |
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436 getbundleargs['oldexcludepats'] = 'csv' |
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437 getbundleargs['includepats'] = 'csv' |
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438 getbundleargs['excludepats'] = 'csv' |
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439 getbundleargs['known'] = 'csv' |
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440 |
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441 # Extend changegroup serving to handle requests from narrow clients. |
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442 origcgfn = exchange.getbundle2partsmapping['changegroup'] |
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443 def wrappedcgfn(*args, **kwargs): |
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444 repo = args[1] |
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445 if repo.ui.has_section(_NARROWACL_SECTION): |
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446 getbundlechangegrouppart_narrow( |
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447 *args, **exchange.applynarrowacl(repo, kwargs)) |
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448 elif kwargs.get(r'narrow', False): |
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449 getbundlechangegrouppart_narrow(*args, **kwargs) |
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450 else: |
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451 origcgfn(*args, **kwargs) |
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452 exchange.getbundle2partsmapping['changegroup'] = wrappedcgfn |
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453 |
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454 # Extend changegroup receiver so client can fixup after widen requests. |
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455 origcghandler = bundle2.parthandlermapping['changegroup'] |
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456 def wrappedcghandler(op, inpart): |
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457 origcghandler(op, inpart) |
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458 if util.safehasattr(op, '_widen_bundle'): |
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459 handlechangegroup_widen(op, inpart) |
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460 wrappedcghandler.params = origcghandler.params |
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461 bundle2.parthandlermapping['changegroup'] = wrappedcghandler |